TECHNICAL SPECIFICATION - HPCLtenders.hpcl.co.in/tenders/tender_prog/TenderFiles/846... · Web viewThe projection of skirting from the finished wall surface shall not be more than

TECHNICAL SPECIFICATION

TECHNICAL SPECIFICATIONS-MATERIALS

GENERAL :

a. All materials to be used in the execution of Civil & structural works shall be governed by the requirements of this specification.

b. Whenever any reference to IS codes is made, the same shall be taken as the latest revision (with all amendments issued thereto) as on the date of submission of the bid.

c. Apart from the IS codes mentioned in particular in various clauses of this specification, for a specific work under consideration all other relevant codes regarding quality, testing and/or inspection procedures shall be applicable. Reference to some of the codes in the various clauses of this specification does not limit or restrict the scope of applicability of other referred or relevant codes.

d. In case of any variation/contradiction in provisions between IS codes and this specification, the provisions given in this specification shall be followed with the approval of the Engineer In Charge/consultant/architect.

e. All materials shall be of standard quality and shall be procured from renowned sources/manufacturers approved by the EIC /Architect/Consultant. It shall be the responsibility of the contractor, to get all materials approved prior to procurement and placement of order.

f. Quality and acceptability of materials not covered under this specification shall be governed by the relevant IS codes. In case IS code is not available for the particular material, other codes e.g. BS or ASTM shall be considered. The decision of the Engineer In Charge/ consultant/ architect in this regard shall be final and binding on the contractor.

g. Whenever asked for, the contractor shall submit representative samples of materials to the client for inspection and approval. Approval of any sample does not necessarily exempt the contractor from submitting necessary test reports for the approved material, as per the specification / relevant IS codes.

h. The contractor shall submit manufacturer’s test reports on quality and suitability of any material procured from them and their recommendation on storage, application, workmanship etc. for the intended use. Submission of manufacturer’s test reports does not restrict the client/consultant from asking for fresh test results from an approved laboratory of the actual material supplied from any approved manufacturer/source at any stage of execution of work.

i. All costs relating to or arising out of carrying out the tests and submission of test reports and or samples to the client/consultant for approval during the entire tenure of the work shall be borne by the contractor and included in the quoted rates.

j. Materials for approval shall be separately stored and marked, as directed by the client/consultant and shall not be used in the works till these are approved. The contractor at his own cost shall immediately remove all rejected materials from the site.

K. In the event that state, city or other Government bodies have requirements, more stringent than those set

forth in this specification, such requirements shall be considered part of this specification and shall supersede this specification where ever applicable.

L. The quality of materials , method and control of manufacture and transportation of all concrete works irrespective of

the mix , whether reinforced or otherwise, shall conform to the applicable portion of this specification.

M. Engineer shall have the right to inspect the source/s of material/s , the layout of operations of procurement and storage of materials. Such an inspection shall be arranged and appval of Engineer-In-Charge shall be obtained prior to starting of concrete work. N. Concrete shall be mixed by mechanical mixer only and no hand mixing shall be allowed for CC works.

NOTE : In case of any contradiction between description of item given in the bill of quantities ( BOQ) and that given in the technical specification , the former i.e. BOQ shall be followed.

EARTHWORK:

1.SETTING OUT AND MAKING PROFILE:

Masonry pillars will be erected at suitable points. These bench mark shall be connected to standard bench mark. In addition to these pillar center line pillars shall also be erected by the Contractor and footing positions shall be marked with the help of these pillars. The necessary profile shall be set out. The level shall be taken at a interval as directed by IEC.

The levels shall be recorded in field books and plotted on plan before starting the excavation.

2. EXCAVATION FOR FOUNDATION:The cutting shall be done to minimum depths as per drawings and as advised by EIC. Any excess excavation carried out by the Contractor without proper permission from EIC shall not be paid and the excess depth shall be made good by the Contractor by PCC 1:4:8 at contractor’s own cost.

BACKFILLING:

In case water is encountered during the excavation for foundation, or flooding of pits due to any other reasons the contractor shall arrange for dewatering the same at his own cost.

2.1 EXCAVATION IN HARD ROCK:CUTTING Where hard rock is met, generally excavation by chiseling and wedging shall be carried out. Excavation by blasting shall be done only after taking all safety precautions and approvals as required and after obtaining written approvals from Engg.-in-Charge/Architects. In case of excavation by blasting all the provisions of explosive rules 1940 (Corrected upto date) shall be complied with storing, transportation and handling of explosive materials. The blasting operation shall be carried out under the supervision of a responsible authorised agent of the contractor. Blasting work shall not be carried out within 200 metres of an existing structure unless otherwise permitted by the Engg.-in-Charge / Architects.

3.0.0MATERIALS FOR FILLING

3.1.0SAND

15.1.1 Sand used for filling shall be clean river sand hard, gritty, dry and coarse, free from earth, silt organic matter, clay and other deleterious materials.

3.2.0MOORUM

3.2.1QUALITY OF MOORUM:

The moorum shall be naturally occuring material formed by disintegration of rock. It shall be free from vegetarian, rubbish or

material of organic origin and scales deleterious to concrete and reinforced concrete.

Pieces of hard rock which do not get crushed under the roller shall not exceed 50mm size.

3.2.2 FILLING:

Filling shall be done in 15 cm thick layers and every layer shall be power rolled with 8/10 ton roller so as to achieve maximum compaction and till such time that no further movement is observed under the wheels of the roller. Hand rolling is permissible in case filling is done inside sales building.

After filling is completed the modified procter density shall be 92% with OMC.

Before start of work the contractor shall supply the samples of murrum from each quarry to cover the variations expected in the supply. The samples shall be tested for the following in a recognised laboratory in accordance with IS:2720 for the following.

Silt and clay content.Moisture-content and dry density relationship at modified Procter density.

Moisture Control: Water shall be always sprayed and not poured. Ponding shal never be allowed. In wet weather the work may have to be carried out by using suitable safeguards without any extra cost. Care shall be taken to see that moisture is uniformly spread throughout the layer and where necessary mixing with harrows and rakes shall be done.

Measurements: Measurements shall be of the cubic contents of the completed filing and shall be determined by taking level of testing ground and after final layer for each type of filing. All dimensions are for compacted thickness.

4.0.0 CEMENT

Unless otherwise specified ordinary Portland cement of 43 grade conforming to IS:8112 shall be used for all concrete works.However OPC grade 53 may be used after approval of EIC.

4.1.0 SUPPLY :

Cement used shall be one of the following with prior approval of the Engineer In Charge/ consultant / architect.

a. Grade 33 Ordinary Portland cement conforming to IS:269b. Grade 43 Ordinary Portland Cement conforming to IS:8112.c. Grade 53 Ordinary Portland Cement conforming to IS:12269.

Portland Slag Cement conforming to IS:455.

Portland Pozzolana Cement conforming to IS:1489.

Cement to be used shall be of the best quality from reputed brands like ACC/ Birla/Gujrat Ambuja/L&T /Lafarge /Grasim or any other equivalent as approved by the Client / consultant.

Where specified, special cement like Sulphate resisting Portland cement (conforming to IS:8042-E), Coloured cement shall be used.

Rapid hardening cement shall have strength in one day equal to that of OPC in 3 days. It shall be used for products like Hume pipe, tiles, sleepers, poles, pre stressed and precast members. It shall also be used for foundation, bridges, culverts, causeways, etc. where quick construction activity is required however with prior permission of the consultant/architect. Test certificates showing that the cement complies with the specifications must be submitted to the EIC /consultant.

Sulphate resistant cement should possess low heat of hydration, more compressive strength at 3, 7 and 28 days than OPC. It should be capable of withstanding attack of aggressive substances like sulphate of sodium, magnesium, calcium, etc. which damage concrete structures. It shall be used with prior approval for structures in or near sea water, where the soil conditions are aggressive, where repeated cycles of drying and wetting occur and also for structures exposed to sulphate attack like industrial drains, sewage pipes, foundations, bridges, dams, tunnels. Test certificates showing that the cement complies with the specifications must be submitted to the EIC/consultant.

Coloured cement shall be white or grey Portland cement mixed with pigment as specified in the item of work. It shall comply with physical requirements of IS:269/8112 and pigments shall be inorganic oxide pigments either natural or synthetic in origin complying with the requirements of B.S.:1014. The pigments used for coloured cements shall be of approved quality and its quantity shall not exceed 10% of cement used in the mix. The mixture of pigment and cement shall be

properly ground to have a uniform colour and shade. The pigments shall have such properties as to provide durability under exposure to sunlight and weather. The pigment shall have the property such that it is neither affected by the cement nor detrimental to it.

In case more than one type of cement is used in any work, a record shall be kept showing the location and type of cement used. Each type of cement shall preferably be obtained from one constant source throughout the contract. Cement of different types shall not be mixed with one another. Different brands of cement or the same brand of cement from different sources shall not be used without prior notification or approval by client.

The cement shall be supplied to the site in original sealed bags, which shall be labelled with the weight, name of manufacturer, date of manufacture, brand and type. Cement received in torn bags shall not be used. Bags of cement that vary in weight by more than 3% shall not be accepted.

The contractor shall maintain a daily record of cement received and consumed in an approved form and a copy shall be submitted to the engineer-in-charge once a week.

4.2.0Storage :

4.2.1 Cement bags shall be stored dry, leak proof, moisture proof and well-ventilated godowns built at the cost of the contractor. Cement of different types shall be stored in separate godowns or separate compartments of a godown.

The floor of the godown shall be raised and shall consist of wooden planks resting on the base prepared with dry bricks laid on edges. Stacking of cement bags shall have a clearance 150 to 200 mm above the floor and 450 mm from the wall.

Cement shall be stored in stacks, which are not higher than 10 bags to avoid lumping due to pressure and in such a manner as to permit easy access for inspection and identification.

The bags shall be kept close together in rows of two bags to reduce circulation of air as much as possible. The bags shall be arranged in header and stretcher fashion so as to lessen the danger of topping.

1.2.5 ‘First in’, ‘First out’ rules shall be applied while removing the bags for use.

1.2.6 Cement stored during monsoons or for an unusually long period, shall be completely enclosed in polythene sheet which shall cover the top of the stack. The contractor shall ensure that the polythene sheet is not damaged at any time during use. Storage under tarpaulins shall not be permitted.

1.27 No stored cement bag shall be used after three months from the date of manufacture. Generally, stacking and storing of cement shall be in accordance with Clause 3.2 of IS:4082.

4.3.0Quality of cement.

1.3.1 The manufacturer shall satisfy himself that the cement conforms to the relevant Indian standards and if required, shall furnish a certificate to this effect to the purchaser or his representative within ten days of the despatch of the cement.

1.3.2 The contractor shall be fully responsible for the quality of cement brought to work site. In case the contractor has any doubt regarding the quality of cement brought to work site, it is upto him to have it tested at his own expense and make sure that the cement is of acceptable quality.

4.4.0Testing :

14.1 The contractor shall submit test certificates furnished by the manufacturer to client/consult. Where the client/consultant is not convinced about the quality of cement, he can ask the contractor to have the cement tested or he can take samples in the presence of contractor from cement bags stored at work site and forward them to government approved laboratory for testing. Expenses towards such tests shall be borne by the contractor.

4.5.0Sampling :

4.5.1 For one lot of 50 tonnes of cement, 2% of bags shall be picked out at random, from which one sample of 15 kg shall be taken.

4.5.2 Samples for testing may be taken by the purchaser or his representative within one week of delivery and all tests shall be commenced within one week of sampling.

4.5.3 When it is not possible to test the samples within one week, the samples shall be backed and stored in airtight containers till testing.

causes for rejection :

4.6.1 Cement not conforming to relevant specification shall be rejected by the client/consultant. the contractor, at his own expense shall immediately remove rejected cement from the work site.

4.6.2 damaged or reclaimed or partly set cement will not be permitted to be used and shall be removed from the site.

4.6.3 the minimum requirements for any type of cement to be considered as acceptable are tabulated in table-A

TABLE A : PHYSICAL REQUIREMENTS FOR CEMENT.

Type of cement OPC 33Grade

OPC 43 Grade

OPC 53 Grade

PPC PSC

Code NO. IS:269 IS:8112 IS 12269

IS 1489 IS 455

Fineness by Blaine’s method (sq.m/kg),min.

225 225 225 300 225

Setting time (mins) Initial(More than)Final (Less than)

30600

30600

30600

30600

30600

Loss on ignition (Max %) 5 5 4 5 4Insoluble Residue (Max %)

4 2 2 {0.96X +4}X=% of Pozzolana

2.5

Soundness (Max)Lechatelier (mm)Autoclave (%)

100.8

10 0.8

100.8

100.8

100.8

Compressive Strength *(Min) (N/sq.mm)7 days28 days

2233

3343

3753

2231

22--

Compressive strength test shall be carried out on 70.70x70.70x70.70 mm mortar cubes made from cement and sand (conforming to IS 650) mixed in the proportion of 1:3.0

4.7 WORKMASNSHIP

The use of bulk cement will be permitted only with the approval of EIC. Changing of brands or type of cement within the same structure will not be permitted.

CONTRACTOR will have to make his own arrangements for the storage of adequate quantity of cement. Cement bags shall be stored in a dry enclosed shed (storage under tarpaulin will not be permitted), well away from the outer walls and insulated from the floor to avoid contact with moisture from ground and so arranged as to provide ready access. Damaged or reclaimed or partly set cement will not be permitted to be used and shall be removed from the site. Not more than 12 bags shall be stacked in any tier. The storage arrangement shall be approved by engineer. Consignment of cement shall be stored as received and shall be consumed in the order of their receipt at site.

Cement held in storage for a period of Ninety (90) days or longer shall be tested. Should at any time Engineer have reasons to consider that any cement is defective, then irrespective of its origin, date of manufacture and/or manufacturer’s test certificate, such cement shall be tested immediately at Contractor’s cost . It shall not be used in any work unless confirmed by approved lab after testing. Contractor shall not be entitled to any claim of any nature on this account.

5.0.0AGGREGATES

Aggregates for concrete shall be procured from approved sources conforming to the specifications of IS:383 and shall be chemically inert, clean, strong, durable, with limited porosity and free from deleterious materials which cause corrosion of reinforcement or may impair the strength and durability of concrete. Aggregates shall not contain water-soluble sulphur trioxide in excess of 0.1%. The chloride ion content of fine and coarse aggregate shall not exceed .06% and 0.02% respectively by mass of dry aggregate. If either aggregate exceeds these limits the material may still be considered acceptable by the engineer provided that the total chloride ion concentration derived from the aggregate is not grater than 0.35% by mass of the cement in the mix.

All aggregates shall comply with IS:2386 and IS:383 in respect of impurities and additionally with the following :

a)Absorption6% maximum by weight for ordinary construction and 2% maximum for water proof construction.

b)Salt 1% maximum (equivalent anhydrous calcium percentage by weight of cement)

c) Carbonates 10% maximum by weight.

Unless otherwise specified, fine aggregate shall be imply natural river sand for the purpose of reinforced concrete work.However stone dust confirming to IS 2386 may be alloswed by EIC to be used under exceptional cases.

5.1.0FINE AGGREGATE :

5.1.1GENERAL REQUIREMENTS :

a. The maximum size of the sand particles shall be 4.75 mm and down graded.

b. The sand shall be free from adherent coatings and shall not contain harmful materials such as iron pyrites, coal, mica, slit, clay, alkali, sea shell, organic impurities, loam, etc..

c. The maximum quantity of deleterious materials shall not exceed 5 percent and the limits specified in table 1 of IS:383 when tested in accordance with IS:2386 (Part-2).

d. Aggregates, which are chemically reactive with alkalis of cement, shall not be used, as it will induce cracking of concrete.

e. Silt and dust present in natural sand shall be limited to 8% by weight. In case it is more than 8%, it shall be washed at site with clean water. Presence of mica shall not be more than 1% by weight.

5.1.2Grading :

Fine aggregate with a fineness modulus value less than ‘2’ shall not be used for reinforced concrete work. The natural sand used for RCC work shall have a grading conforming to one of the three grading zones given in the following table (Table B). Fine aggregate conforming to grade IV as per IS:383 shall not be used for RCC works.

For coarse sand the grading of sand as determined by the method prescribed in IS : 2386 Part I shall be within the limits of grading III given in Table B.

Stone dust shall be obtained by crushing hard stone and the grading shall be as determined by the method prescribed in IS:2386 Part I & II. It shall be within the limits of grading zone III. The fineness modulus of

stone dust shall not be less than 1.8. It shall not contain more than 8% of silt as determined by field test with measured cylinder. The silt content is found out by keeping a sample of stone dust without drying in 200 mm measuring cylinder. The quantity of the sample shall be such that it fills the cylinder upto 10mm mark. Then clean water shall be added upto 150 mm mark. The mixture shall be stirred vigorously and the contents allowed to settle for 3 hours. The height of slit visible as settled layer above the stone dust shall be expressed as percentage of the height of the stone dust below. The stone dust containing more than 8% of silt shall be washed so as to bring down the content within the allowable limit.

When grading falls outside the limits of any particular grading zone of sieves, other than 600 micron IS sieve, by a total amount not exceeding 5%, it shall be regarded as falling within that grading zone.

TABLE B: GRADING OF FINE AGGREGATE (AS PER IS :383)

IS Sieve Designation

Pecentage by wight passing IS SieveGrading Zone I

Grading Zone II

Grading Zone II

Grading zone IV

10 mm 100 100 100 1004.75 mm 90-100 90-100 90-100 95-1002.36 mm 60-95 75-100 85-100 95-1001.18 mm 30-70 55-90 75-100 90-100600 micron 15-34 35-59 60-79 80-100300 micron 5-20 8-30 12-40 15-50150 micron 0-10 0-10 0-10 0-15

5.1.3Sampling and testing :

a. Fine aggregate shall be subjected to inspection and testing.b. The method of sampling for test shall be in accordance with

IS:2430.c. Samples of fine aggregates for testing shall be collected from

transportation units or stack or stockpiles. Each sample shall be packed separately and despatched to the testing laboratory.

d. Packing and marking of samples shall be done in accordance with clause 6.0 of IS:2430.

e. The contractor shall furnish test results of samples as may be required by the client/consultant.

f. Testing shall be carried out in accordance with IS:2386 (Parts-1 to 8).

5.1.4Storage :

a. Aggregate shall be stored on a hard surface or a well designed platform of concrete, timber, metal or any other approved material so as to prevent the mixture of clay, dust, vegetable and other foreign matter.

b. Storing and stacking of fine aggregate shall be done in accordance with clause 3.5 of IS:4082.

c. While stacking, the aggregate shall not form pyramids resulting in segregation of different size particles. The stacks shall be regular.

d. Unless otherwise specified or necessitated by site conditions, stacking of fine aggregate shall be sufficiently away from that of coarse aggregate.

Coarse aggregate shall mean aggregate of which not less than 95% by weight is retained on 4.75 mm mesh IS test sieve of IS:2430 and shall conform to IS:383.

5.2.0COARSE AGGREGATE :

5.2.1General Requirements :

Coarse aggregates shall be machine-crushed stone of black trap or equivalent black hard stone and shall be hard, strong, dense, durable, clean or procured from quarries approved by the client/consultant. Generally coarse aggregate shall be cubical in shape and not flake or elongated.

Aggregates shall be free from injurious amounts of disintegrated pieces, reactive silica, alkali, harmful salt, organic matters and other deleterious materials. Coarse aggregates to be used for reinforced cement concrete work shall not contain any material liable to attack the steel reinforcement.

The maximum quantity of deleterious materials shall not exceed 5 percent of the weight of coarse aggregate and the limits specified in Table I of IS:383 when tested in accordance with IS:2386 (Part-2).

The amount of fine particles occuring in the free state or as loose adherent shall not exceed 1% when determined by laboratory sedimentation tests as per IS:2386.

In selecting the aggregates the Contractor shall satisfy and ensure that the source is suitable for regular supply and a watch shall be maintained that the particle shape and grading remain reasonably uniform throughout the progress of work.

The contractor shall arrange to supply coarse aggregates in single size, for each nominal size, conforming to the grading given in Table 2 of IS:383. The single sizes shall be combined in suitable proportion to get desired overall grading of aggregates. The cilent/consultant at his discretion, may allow the use of “Graded Aggregate” of nominal size, to conform to the grading specified in Table 2 of IS:383.

5.2.2Maximum Size :

The maximum size of aggregates shall not be great than one quarter of the maximum thickness of the member so as to surround all reinforcement. For heavily reinforced concrete members, the nominal size of aggregate shall be 5 mm less than the minimum clear distance between the reinforcement main bar or 5 mm less than the minimum cover to the reinforcement whichever is smaller.

In reinforced concrete work, unless otherwise specified, nominal maximum size of coarse aggregate shall be 20 mm and down.

5.2.3Storage :

a. Generally, storage of coarse aggregate shall conform to clause 3.5 of IS:4082. Aggregates shall be stored at site on a hard and dry patch of ground, preferably levelled and rolled.

b. Aggregates of various sizes shall be stored in separate stockpiles with height not exceeding 1m to prevent coning or segregation. A bottom layer of coarse aggregate 100 mm deep shall be undisturbed while removing the material for use.

c. If the aggregates are stored at site for a long time, it shall be sieved before use, to remove dust, if directed by the consultant.

6 . CONCRETE WORK

MATERIALS FOR STANDARD CONCRETE:The ingredients to be used in the manufacture of standard concrete shall consist solely of a standard type portland cement, clean sand, natural coarse aggregate, clean water and admixtures .

CONSISTENCY:The consistency of the concrete shall be such that it flows sluggish into the forms and around the reinforcement without any segregation coarse aggregate from mortar. The slump tests are mandatory and shall be carried out at regular intervals so that the consistency concrete can be monitored.

PLACING OF CONCRETE:Concreting shall commence only after inspection and approval by EIC.Shuttering shall be clean and free from deposits of foreign materials and proper deshuttering agent shall be applied to the surface.Proper arrangements shall be provided for conveying the concrete at the place of deposition without disturbing the reinforcement.

COMPACTION:Concrete shall be compacted immediately after placing by means of mechanical vibrators.All RCC works shall be cured for a minimum period of 14 days or more as advised by EIC.

INSPECTION AND RECTIFICATION OF DEFECTS:

Immediately on removal of forms, the RCC works shall be examined by the Engg. -in-Charge / Architects before any defects are made good.The work that has sagged or contains honey combing to an extent detrimental to the structural safety or architectural concept shall be rejected.Surface defects on a minor nature may be accepted and the same shall be rectified as follows :a) Bulges due to movement of forms, ridges at forms, ridges at form

joints shall be carefully chipped and then rubbed with a grinding stone.

b) Honeycombed and other defective areas must be chipped out, the edges being out as straight as possible and perpendicular to the surface. Shallow patches are first treated with a coat of thin grout (1 cement : 1 sand) and then filled with mortar similar to that used in concrete. Large and deep patches shall be filled up with concrete held in place by forms and shall be reinforced.

c) Holes left by bolts shall be filled carefully with mortar. Holes extending right through the concrete shall be filled with mortar with a pressure gun.

d) The same amount of care to cure the material in patches should be taken as with the whole structure.

POST TREATMENT OF SURFACE :The surface which has to receive plaster or where it has to be joined with brick masonry walls shall be properly roughened immediately after the shuttering is removed.ACCEPTANCE CRITERIA OF CONCRETE WORK :Minimum of six sample cubes shall be taken for all concreting work (periodicity as specified in 9.6 of section III) and three cubes shall be tested after 7 days curing and balance after 28 days curing.7 Days Test :The average strength of the three specimens shall be accepted as the compressive strength of the concrete provided that the difference between maximum and minimum strength of the three cubes does not exceed 15% of average strengthIn case the 7 days strength is not satisfactory all further work structurally interlinked with the concrete represented by the samples shall be stopped till the remaining three cubes are tested for 28 days strength and are found satisfactory.

28 Days Test :The tests should generally be carried out on 28th day, but in no case, should be delayed beyond 35 days. The strength of the cubes shall be as specified in table above if they are tested on the 28th day. In case, the cubes are tested after 28 days, the minimum acceptable compressive strength shall be increased by 1.5 kg/cm2 for each day beyond 28th day.

The acceptance criteria of 28 days test shall be as follows ;a) If the average compressive strength of three cubes is more or equal

to the comp. Strength shown in table above, the concrete shall be accepted at full rates.

b) If the average comp. Strength of the three cubes is less than specified but not less than 75% of the specified strength, the concrete shall be accepted at reduced rates at the discretion of EIC. The reduced rate shall be calculated on proportionate basis, i.e. for every percent decrease in the specified strength the rate shall be reduced by the same percentage.

c) If the average compressive strength of the three cubes is less than 75% of the specified strength, EIC shall either reject the defective portion or get it dismantled along with the structurally connected work as considered necessary at the risk and cost of the contractor. EIC may also desire to carry out additional tests on the defective work and if on the basis of these additional tests, EIC is satisfied about the structural adequacy of the concrete the concrete work may be accepted at the reduced rate as specified in b) above except, for the reduced strength below 75% for which the reduction shall be 1.5 times for every percent decrease below 75%

Example : Average compressive strength is 70% of specified strength. The rate payable shall be 75 - 1 5 (75-70) = 67.5% of tendered rate.MEASUREMENT All measurements shall be as per IS 1200

7.0.0STEEL REINFORCEMENT:

7.1.0Supply :

Steel reinforcement for concrete shall be round/ribbed bars, unless otherwise specified and shall comply with he following grades.

(i)High strength deformed steel bars (ii) TMT bars conforming to IS:1786. If specified, tested quality high yield strength deformed corrosion resistant steel (CRS) bars from TATA (TISCON-50CRS) , SAIL (HCR-REBARS Gr.M) or equivalent conforming to IS:1786 for mechanical properties with improved corrosion resistance and bond strength shall be used.

Only new steel shall be delivered to the site and shall be free of mill scale, loose rust, grease oil, paint or any other deleterious materials which reduce or destroys bond.

7.2.0Measurement of Reinforcement :

Measurement relating to nominal mass, dimensions and tolerances of various types steel shall conform to relevant IS codes.

Reinforcement shall be measured in lengths of bar as actually placed in position on standard weight basis, no allowance being made in the weight for rolling margin. Wastage and binding wire shall not be measured. Authorised overlaps ,Chairs ,splices,spacers and hooks shall only be measured. Rate quoted shall include the cost of welding if specified.Payment shall be made as per reinforcement drawings and with theoritical weights only7.3.0Testing :

Test certificates from manufacturer, mill certificates and certificates of origin shall be submitted for each consignment. Additional tests if required shall be done as recommended by the cilent/consultant at the contractor’s own cost. An accredited laboratory shall carry out testing. Any reinforcement so sampled and tested which fails to comply with the specifications shall be rejected and the whole batch shall be removed from the site immediately. The contractor shall have no claim for bars mutilated in obtaining test samples.

7.4.0Sampling

Sampling shall be done in accordance with relevant IS codes. For every 40 tonnes of steel at least one test shall be done.

CRS reinforcing bars shall conform to the physical properties of IS:1786. In addition when tested for corrosion reistance as per the standard ASTM method such as salt spray test (B.117.90), Potentio Dynamic Polaristion measurement test (G.5.78), Atmospheric Corrosion test (G.50.76) and Sulphur-di-oxide chamber test (G.87.84) shall exhibit corrosion resistance index of minimum 1.5.CRS (deformed) bars should either be butt or lap welded as per recommended practice of IS:9417. For best results basic coated electrodes containing copper and/or nickel shall be used.

The chemistry of CRS should be as given below :

Carbon -0.15% maxSulphur(S) -0.05% maxPhosphorus (P) -0.12% maxS+P -0.17 % maxSilicon -0.45 % maxCorrosion

Resistant elements -1.5 % max

7.5.0Binding Wire :

The reinforcement shall be securely bound wherever bars intersect or wherever required with 18 gauge (1.22 mm) annealed steel wire conforming to IS:280.

7.6.0 Chairs :Adequate no. Of chairs shall be provided to prevent sagging of reinforcement during concreting.

7.7.0Mechanical splices :

Mechanical connections for spilicing reinforcement bars in congested locations shall be used only with the approval of consultant/Engineer-in-charge. Patented couplers as manufactured by Usha Martin Industries Ltd. (CCL bar grips) and BBR India Ltd.(BBR SWIF) shall be used wherever mentioned in the drawings. The couplers shall be attached to the reinforcement bars by forging, hydraulic pressing or screw couplers in special circumstances may be permitted. All operations relating to reinforcement coupling shall be done using supplier’s patented machine / equipment and in the presence of the supplier’s representative. The contractor shall submit relevant trade literature, mil certificates, certificate of origin and letters of approval for each proposed application. A sample of each type of mechanical coupler shall be submitted for testing and approval prior to the use of any coupler in the works.

7.8.0Welding electrodes :

Electrodes used for welding of steel bars shall be orginary mild steel grade 2 electrodes conforming to IS:814 and shall be the best quality and approved by the Engineer-in-charge. The work shall be carried out strictly as per IS:2751 and IS:9417.

7.9.0Causes of Rejection :

Steel reinforcement, not conforming to relevant specification, shall be rejected by the client/consultant. Every bar shall be inspected before assembling on the work and defective, brittle or burnt bar shall be rejected. Cracked ends of bars shall be discarded. The contractor at his own expense shall immediately remove rejected steel from the work site.

7.10.0 Storage :

Steel reinforcement shall be handled and stored in a manner that bending or distortion of the bars is avoided and corrosion of steel is prevented. They shall be stored in such a manner that they are not in direct contact with the ground (at least 150 mm clear above ground). In case of long storage, a coat of cement wash shall be given to the reinforcing steel to prevent any scalling or rusting. Any reinforcement, which is certified as corroded by the Engineer-in-charge, shall either be immediately withdrawn from site or stand blasted and coated with cement slurry. No extra payment shall be amde for sand blasting and cement coating. Bars of different classifications and size shall be stored separately. Generally, storage of reinforcements shall be in accordance with clause 3.7 of IS:4032.

8.0.0WATER :

Water used for various works shall conform to IS:456.


Water used for both mixing and curring of concrete/brickwork/plaster as well as for washing aggregate shall be potable and free from injuruous amounts of deleterious materials like alkalis, acids, oils salts, sugar, organic materials, vegetable growth or other substances which are likely to affect the strength or durability of concrete and other construction materials. Before starting any concreting/brickwork/ plaster work and wherever the source of water changes, the water shall be tested for its acceptability for use in concrete etc. by the mehtods given in IS:3025. No water shall be used until tested and found statisfactory and cost of all such tests shall be borne by the contractor.

Hard and bitter water shall generally be found unsuitable for curing mortar and concrete.

Water for use in mixing with cement shall neither be hotter than 25°C nor colder than 5 °C at the time of mixing.

Whenever temperature controlled concrete is specified, the contractor may establish an ice making plant of required capacity at site.

Water used for curring shall not produce any objectionale stain or unsightly deposit on the surface. It shall be free of elements that significantly affect the hydration reaction. Presence of tannic acid or iron compounds in water is objectionable.

Acceptance Criteria :

Water to be used, shall satisfy the following :

8.2.1 To neutralise 200 ml sample of water, using phenobhihalein as an indicator, it shoudl be require more than 2 ml of 0.1 normal NaOH.

To neutralise 200 ml sample of water, using methyl orange as an indicator, it should nto require more than 10 ml of 0.1 normal HCL

8.2.3 IT should not contain soilids by wieght in excess of the following :

Organic 200 mg/litreInorganic 3000 mg/litreSulphates 500 mg/litreChlorides 1000mg/litre for RC work and

2000 mg/litre for other worksSuspended Matter 2000 mg/litre

The pH value of water shall be between 6 and 8.

If required by the Engineer-in-charge it shall be tested by comparison with distilled water. Comparison shall be made by means of standard cement tests for soundness, time of setting and mortar strength as specified in IS:269. Any indication of change in time of setting by 30 minutes or more or decrease of more than 10% in strength of mortar prepared with water sample when compared with the results obtained with mortar prepared with distilled water shall be sufficient cause for rejection of water under test.

8.3.0Sample for Testing :

The sample of water taken for testing shall represent the water proposed to be used, with due account being paid to seasonal variation. The samples shall not receive any treatment before testing other than that envisaged in the regular supply of water proposed for use. The sample shall be stored in a clean container. Test shall be carried out only once for one particular source.

Testing shall be done as per IS:3025 (Relevant parts).

8.4.0Storage :

Storage of water shall generally conform to IS:4082, whenever water is to be storted for construction purposes. Water storage tanks

shall be covered to the satisfaction of the Engineer-in-charge to prevent contamination.

9.0.0ADMIXTURES

Admixtures shall be used in concrete, mortar plaster etc. as specified in the schedule of items and/or drawing only after the product is approved by the client/consultant. The contractor is bound to furnish all such information like dosage, method of application, chloride content, etc. required to decide on the suitability of the admixture. All required tests should be carried out at the instructions of the client at no extra cost.

Use of admixture being a specialised job, shall be carried out strictly as per manufacturer’s recommendaitons.


Admixtures used shall conform to the following relevant IS codes and shall be purchased from reputed manufacturers as approved by cielnt/consultant. In reinforced concrete, the chloride ion of any admixture used shall not exceed 2% by weight of the admixture as determined in accordance with IS:6925 and the total chloride ion in all admixtures used in concrete mi shall not exceed 0.83% by weight of cement. The addition of calcium chloride to concrete containing embedded metal will not be prermitted under anyc ircumstances.

Accelerating Admixtures conforming to IS:9103 & 2645. It shall be in liquid state with a specific gravity of 1.3 and complying with ASTM C-494 type E. It shall accelerate the setting and hardening of the concrete mix thereby achieving high early ago strength. It shall be from CICO or equivalent and used at the rate instructed by the manufacturer. It should be compatible with all types of cement.

Retarding Admixtures conforming to IS:9103. It shall be in liquid state with a specific gravity of 1.22 and complying with ASTM C-494 type B&D, CRD-C87 type B & D, BS:5075 part 1. It shall be added to the concrete mix during the mixing process along with water and aggregates. No extension of normal mixing time is necessary. It shall delay the initial and final setting time. It shall help to spread the heat of hydration over a longer period of time. It shall give a highly workable concrete with a low W/C ratio. It shall be from CICO, Feb Roffe or equivalent and be used at the rate instructed by the manufacturer, with cement, depending on the amount of acceleration of hardening required. It should be compatible with all types of cement.

Air-entraining Admixtures conforming to IS:9103.

Water-reducing admixtures conforming to IS:9103. Only naphthalene based water-reducing admixture/plasticizers shall be permitted.

Integral waterproofing admixtures conforming to IS:2645. It shall be from Feb Roffe’s Roff Hyseal, Roff Hyproof, Algiproof or equivalent. It shall be used as an excellent cement admixture in all types of concrete/ plaster mortars, pointing mortars, masonry works, guniting works and pressure grouting works. It shall improve resistance of the surface to weathering and chemical attacks. It shall be no-toxic so as to use for waterproofing in water tanks, reservoirs, tanks, etc..

9.2.0Product information :

5.2.1 The contractor shall further provide the following information concerning each admixture to the cielnt/consultant.

a. Optimum dosage and detrimental effects of under-dosage and over-dosage.

b. Chemical names of the main ingredients in the admixture.c. The chloride ion content expressed as percentage by weight of

admixture.d. Whether or not the admixture leads to entrapment of air when used

in the manufacturer’s recommended dosage and if so, to what extent.

Where two or more admixtures are proposed to be used in any one mix, the manufacturer’s written confirmation of their compatibility.

There would be no increase in risk of corrosion of the reinfo4rcement or other embodiments as a result of using the admixture.

9.3.0Sampling :

9.3.1 Sampling for testing shall be done in accordance with clause 4.1 of IS:9103 for liquid admixtures and clause 4.2 of IS:9103 for non-liquid admixtures.

9.3.2 samples shall be packed in moisture-proof airtight containers.

9.3.3 Sampling of integral waterproofing compound shall be done as given in IS:2645.

9.4.0 Testing :

For checking the physical properties of any admixture, tests shall be carried out as detailed in clause 3 of IS:9103. Results shall conform to the requirements given in Table 1 of IS:9103.

For air entraining admixture, tests shall be carried out as agreed to between the client/consultant. And the manufacturer. Except where resistance to freezing and thawing and to disruptive action of de-icing salts is necessary, the air content of freshly mixed concrete in accordance with the pressure method given in IS:1199 shall not be more than 2% higher than that of the corresponding control mix and in any case not more than 3% of the test mix.

For integral waterproofing compound, tests shall be carried out as per methods given in IS:2645.

Uniformity tests on the admixture are essential to compare qualitatively the composition of different samples taken from batch to batch or from the same batch at different times.

All tests relating to concrete and admixture shall be conducted periodically at an independent laboratory and compared with the data given by the manufacturer.

9.5.0Storage :

9.5.1 Admixtures shall be stored in moisture-proof, airtight containers.

9.5.2 Storage shall in general conform to IS:4082.

10.0.0 FORMWORK

10.1 General requirements :

10.1.1 Shuttering for concrete work below ground level shall be of wrought formwork and that for concrete work in superstructure shall be of fine formwork.

10.1.2 Formwork shall be of Marine Plywood of minimum 12 mm thickness or steel capable of resisting damage to the contact faces under normal conditions of erecting forms, fixing steel and placing concrete. For designated areas prominently in public view the choice of material shall be decided by the Engineer-in-charge.

Where plywood is used, it shall be of best quality, resin bonded and waterproof. Formwork shall be minimum 12mm thick shuttering quality

plywood conforming to IS:4990 aand of make approved by the Engineer-in-charge. Suitable stiffeners and walers shall be provided depending on the shuttering design. It shall be stable and not liable to srap when exposed to sun and rain or wetted during concretting.

Where steel framework is used, it shall be made out of appropriate gauge steel sheets/section with proper framework to ensure perfect surfaces. It shall be made of 3 mm thick black sheets stiffened with angle iron framme. The surface that would come in contact with concrete shall be thoroughly cleaned and either soap solution or raw linseed oil shall be applied.

NOTE : TIMBER SHUTTERING IS NOT ALLOWED

10.1.3 The forms shall be true to dimensions and sizes. The props sused on the work shall be of such type, which can afford finer adjustments for levels, etc. and ensure fully stability.

10.1.4 Wherever applicable, selection of plywood shuttering for formwork shall be made based on the following relevant standards :

Specification for ballies for general purposes as IS:3337. Specification for plywood for concrete shuttering work as per IS:4990.

11.0 BRICKS FOR MASONRY :

11.1.1 General requirements :

a. Bricks for masonry in foundations, walls and other locations shall be hand or machine moulded and made from suitable soil and kiln burnt. They shall have regualr and uniform size and colour, sharp straight and right angled edges and deep cherry red and copper colour, uniformity well burnt throughout but not over-burnt. They shall have smooth rectangular faces with parallel sides and sharp corners. Generally, they shall conform to IS:1077.

b. They shall be free from cracks, flaws and nodules of free lime.c. They shall be moulded with a frog of 100 x40mm and 10mm to

20mm deep on one of its flat sides.

d) They shall give a clear metallic ringing sound when struck by a mallet and shall not break when dropped on the ground on their flat face in a saturated condition from a height of 600 mm.

e) They shall show a fine-grained, uniform, homogeneous and dense texture on fracture and shall be free from lumps of lime, lamination, cracks, air holes, soluble salts causing efflorescence

or any other defect which may impair their strength, durability, appearance and usefulness for the purpose intended. They shall not have any part under-burnt.

f) The size of the conventional bricks shall be 225 x 110 x 75 mm. Only bricks of one standard size shall be used in one work unless specially permitted by the Client / Consultant. The following tolerances are permitted in the standard conventional size adopted on the particular work.

Length plus or minus 3.0 mmBreadth plus or minus 1.5 mm Depth plus or minus 1.5 mm

The size of the modular bricks shall be 190 x 90 x 90 mm or 190 x 40 mm.

g) The crushing strength of the brick to be used in all types of works shall not be less than 75kg/sq.cm unless otherwise specified when tested according to IS:3495 (Part-1).

h) After immersion in cold water for 24 hours, absorption by weight shall not exceed 15 percent of the dry weight of the brick when tested according to IS:3495 (Part-2).

i) Efflorescence in bricks shall be within limits prescribed in (Not more than 10% of the exposed area of the brick shall be covered with a thin deposit of salts) IS:3495 (Part-3).

NOTE : PAYMENT TO BE MADE ON ACTUAL EXECUTED VOLUME OF BRICK WORK AT SITE.

11.1.2 First Class Bricks for Exposed Brick work:

First class bricks are those, which strictly conform to the standard size of modular bricks and such that ten layers of brick laid in mortar shall form masonry of 1 m height. These bricks shall be manufactured from good quality plastic earth, which is free from saline deposits. They shall have straight edges and even surfaces. When immersed in water for an hour they shall not absorb water more than 1/6th of their weight. On drying they shall not show any sign of efflorescence.

11.1.3 Storage of Bricks:

A) Brick shall not be dumped at site. They shall be stacked in regular tiers of height not exceeding 1.5m.

B) Bricks of different types and classifications shall be stacked separately. Generally, stacking of bricks shall conform to IS:4082.

11.1.4 Handling:

Bricks shall be unloaded by hand and carefully stacked. These shall not be thrown to the ground to avoid any damage.

11.1.5 Sampling and Inspection:

Representative samples shall be submitted by the Contractor and approved samples shall be retained by the Client / Consultant for comparison and future reference.

All bricks shall be inspected at site and shall be subjected to the approval of the Consultant who may reject such consignments as are considered by him to be inferior to the quality specified.

The contractor shall provide all labour and plant required for the inspection and conduct of such tests as shall be required by the Consultant without additional charges.

Efflorescence test shall be carried out for a sample of 20 bricks from a stock of 20,000 bricks. Water absorption test shall be done for 32 bricks out of a stock of 35,000 bricks. Compressive strength test shall be done on 50 bricks from a stock of 1,00,000 bricks.

11.1.6 Storage:

Same as that of ‘Coarse aggregate’.

12.0.0 SAND

12.1.0 SAND FOR MASONRY MORTAR & OTHER WORKS:

12.1.1 General Requirements:

A) All the requirements, except particle size grading stated in the section ‘Fine aggregates’ shall apply to this sand also. The sand shall consist of natural sand, crushed stone sand or crushed gravel sand or a combination of any of these.

B) The particle size grading of sand in mortar for unreinforced masonry work shall be within limits specified below, as per IS:2116.

I.S Sieve Designation IS:460 (Part-1)

Percentage by weight Passing I.S Sieve

4.75 mm 1002.36 mm 90-1001.18 mm 70-100

600 micron 40-100300 micron 5-70150 micron 0-15

C) Clay, fine silt & fine dust in natural sand, crushed gravel or stone sand shall not be exceed 5% by mass when determined in accordance with IS:2386 (Part-2).

12.1.2 Sampling and Testing:

A) The method of sampling shall be in accordance with IS:2430.

Any test which the Client / Consultant finds it necessary to be done on sand shall be carried out in accordance with relevant parts of IS:2386. If further confirmation as to the satisfactory nature of the material is required, compressive strength test on cement mortar cube (1:6) shall be carried out in accordance with IS:2250 using the supplied material in place of standard sand and the strength value so obtained shall be compared with that of another mortar cube made with a sand of acceptable and comparable quality.

Storage:

Same as that of ‘Fine Aggregate’.

12.2.0 SAND FOR PLASTER:

12.2.1 General Requirements:

A) Sand used for external, internal wall surfaces and ceiling plaster shall conform to IS:1542 and shall be procured from approved sources.

B) Unless otherwise specified, sand for plaster shall imply natural river sand.

C) The sand shall be hard, strong, dense, durable, clean and free from veins, adherent coatings and shall not contain deleterious materials such as iron pyrites, coal, lignite, mica, silt, clay, alkali, sea shell, organic impurities, loam or any other harmful materials in such quantities so as to adversely affect the strength or durability of plaster.

D) Presence of clay, fine silt and fine dust in sand shall not be more than 4$ by weight as stated in clause 3.0 or IS:1542. Organic impurities shall also be within limits as per Table 1.0 or IS:383.

12.2.2 Grading

A) The grading of sand for internal wall and ceiling plaster shall be within limits specified in the following Table of IS:1542.

REQUIREMENTS OF GRADING FOR SANDS FOR INTERNAL WALL AND CEILING PLASTERPercentage By Weight Passing IS Sieve


(As per IS:460)

Class-A Class-B

240

120

603015

{ 98-100 for under coats{ 100 for finishing coats{ 80-95 for under coats{ 95-100 for finishing coats 30-85 5-50 0-10

98-100 for under coats100 for finishing coats80-100 for under coats95-100 for finishing coats30-955-650-15

B) The grading of sand for external plaster coat and renderings shall be within the limits specified in Table B.

REQUIREMENTS FOR GRADING FOR SAND FOR EXTERNAL PLASTERING AND

RENDERINGS.Percentage By Weight Passing IS Sieve


(As per IS:460)

Class-A Class-B

480 100 100240 90-100 90-100120 70-100 70-10060 40-85 40-9530 5-50 10-6515 0-10 0-15

Class A sand shall be used generally for plaster work but where they are not available, Class B sand may be used after getting the approval from Client / Consultant.

Deviation of about 5% from the specified limits in the grading for fractions passing IS Sieve 120 and 60 only may be allowed subject to agreement between the Client / Consultant and the supplier. Any other deviation shall be left to the discretion of the Client / Consultant.

12.2.3 Sampling and Testing:

Same as that for masonry mortar.

12.2.4 Storage:

Same as that of ‘Fine aggregate’.

13.0.0 STONES

13.1.0 STONES FOR MASONRY :


Generally, the stone to be used shall conform to the requirements of IS:1597 (Part-1) and shall be of specified variety such as Granite, Trap stone, Quartz, sandstone or any other type locally available good hard stones.

Stones used shall be strong, sound durable, dense, compact, close grained, homogeneous, fire resistant and fee from cracks, flaws or defects, segregation, seams, weathered portions and other structural

defects or imperfections tending to affect their soundness and strength and shall be procured from quarries approved by the consultant.

Stones used shall be small enough to be lifted and placed by hand. The length of stone shall not exceed three times the height and the breadth on the base shall not be grater than 3/4” of the thickness of wall not less than 150mm. The height of stone may be upto 300mm.

Stones shall be free from rounded, worn or weathered surfaces or skin or coating which prevents the adherence of mortars.

Stones to be used as headers, quoins, copings, etc. shall comply with the requirements of facing and haearting as may be relevant.

Stones shall be non-porous and when tested in accordance with IS:1124 shall show less than 5% water absorption of its dry weight when soaked in water for 24 hours.

Dressed and worked stones shall strictly follow the recommended dimensions given in Table 1 of : IS:1127 depending on the purpose of work.

For specific use (e.e exposure to chemical fume, fire hazard etc.) type of stone shall strictly conform to the recommendations of Table 2 of IS:1597 (Part 1) or as directed by the Client/Consultant.

13.1.2 Quoin Stone or Corner Stone :

For random rubble masonry (uncoursed and brought to course), quoin stone shall not be less than 0.03 m3 in volume.

For squared rubble (coursed) masonry, the height of the quoin shall be same as the course height and shall not be less than 450mm in any direction.

13.1.3 Hearting and Backing Stone :

For random rubble manonry (uncorsed and brought to course) the hearting or interior filling of a warface shall consist of rubble stones not less than 150 mm in any direction, carefully laid, hammered down to proper position.

For squared rubble (coursed) masonry the hearting or the interior filling of the wall shall consist of flat beded stone, carefully laid on their proper bedsin mortar.

13.1.4 Through stone or Bond Stone :

One through stone shall be provided for every half a square metre of facing, evenly distributed in a staggared pattern.

They shall have baout 0.03 sqm in face area and shall have a tailing for the full width of the masonry when the width of masonry is 600 mm or less.

If the masonry wall is over 600 mm thick, a line of headers overlapping each other by atleast 150mm shall be laid right through the wall from the face to the back.

Thelength of the interior headers shall not be less than 450mm and their average cross sectional area shall not be less than 0.025 sqm.

Bond stone shall be distincltly marked on its face during construction for subsequent verification.

13.1.5 Sampling :

Sampling of stones including quoins and headers to be used in the work shall be got approved by the Client/Consultant before the work is started and such samples shall be maintained in the site engineer’s office for any subsequent inspection.

13.1.6 Testing :

For compressive strength, test pieces shall be made from selected samples in cubical or cylindrical shape. The diameter or lateral dimension of a test sample shall not be less than 50mm and the ratio ofheight to diameter or height to lateral dimension shall be 1:2. Compressive strength andtransverse strength test (if required) on stone samples shall be carried out in the manner specified in IS:1121.

Water absorption test shall be carried out, if directed by the consultant, as per IS:1124.

Tests for durability and weathering shall be done, if directed by the consultant, as per IS:1126 and IS:1125 respectively.

The working of stones to the required sizes and their dressing shal be carried out as per IS:1127 and IS:1129.

14. PLASTERING

14.1 PREPARATION OF SURFACE:

The following surface preparation shall be made for both single and double coat plasters. The surface shall then be thoroughly washed with water, cleaned and kept wet before plastering is commenced.

In case of concrete the surface shall be chipped by chiselling and wire brushing, cleaning the surface and erecting scaffolding it required.

14.2 CEMENT PLASTER (SINGLE COAT)

APPLICATION:

Plastering in cement mortar (1:4) shall be started from the top and worked down towards the floor. All holes shall be properly filled in advance of the plastering as the scaffolding is being taken down. To ensure even thickness and a true surface, plaster of about 15 x 15cm shall be first applied horizontally and vertically, at 3 metres intervals over the entire surface to serve as gauges. The surfaces of these gauged areas shall be truly in the plane of the finished plaster surface. The mortar shall then be laid on the wall, between the gauges with trowel. The mortar shall be applied in a uniform manner slightly more than the specified thickness and brought to true surface by working a wooden straight edge reaching across the gauges with small upward and sideways movements at a time.

All corners, arises, angles and junctions shall be truly vertical or horizontal as the case may be and shall be carefully finished. Rounding or chamfering corners, arises, junctions, etc.where required shall be done without any extra payment. Such rounding or chamfering shall be carried out with proper templates to the sizes required.

Horizontal joints in plaster shall not occur on parapet tops and copings as these invariably lead to leakages. Good quality lime neroo shall be applied to plastered surface with steel trowel to a thickness slightly more than specified and rubbned down to give overall thickness of 12mm and polished to a perfectly smooth and even finish working from top to bottom.

Curing shall be commenced as soon as the plaster has hardened sufficiently. This shall be done by spraying water at regular intervals.

14.3 CEMENT PLASTER (TWO COAT WORK):

The plaster shall be applied in two coats as detailed below:

- Apply 20mm thick coat of CM 1:4 mixed with CICO / ACCO Proof water proofing compound mixed as per manufaturer’s specifications as 1st cost leaving the surface rough.

When the plaster has been brought to true surface with a wooden straight edge the surface shall be left rough with 2mm deep furrows shall be made with a scratching tool to form key for the finishing coat. The surface shall be kept wet till the finishing coat is applied.

Apply 2nd coat of 8mm thick of CM 1:4 and finishing the surface by rubbing with sponge till uniform texture is obtained.

The finishing coat shall be applied after the undercoat has sufficiently set but not dried and in any case within 48 hours of laying the first coat.

15.0.0 STRUCTURAL STEEL :

All material shall be new and shall conform to their respective specifications. The use of equivalent or higher grade or alternative materials will be considered only in very special cases subject to the approval of Client/Consultant.


All structural steel sections shall conform to IS:2062 unless otherwise specified and shall be clearly rolled to proper dimensions and weight subject to permissible tolerances as per IS:1852.

The finished materials shall be free from cracks, surface flaws, laminations rough or imperfect edges and all other harmfull defects and shall have a smooth finish. The material shall be free from loose mill scale, rust pits or other defects affecting the strength and durability.

Structural steel work shall be painted by applying two coats of red oxide primer conforming to relevant IS code and 2 coats of synthetic enamel paint (Conforming to IS:2933) or aluminium paint (conforming to IS:2339). However, steel shall be galvanised, if so required by the Client/Consultant.

Normal hexagonal nuts and bolts shall conform to IS:3138-1966. High strength structural bolts shall conform to IS:3757. Countersunk bolts shall conform to eighr IS:8352 or IS:8353 depending on the type of bolt. Black bolts, nuts and screws shall be in accordance with IS:1363

for Black hexagonal with nuts of 6 to 39mm and black hexagon screw of 6 to 24mm and IS:1364 and IS:1367 for other sizes.

Hot rolled rivet bars shall conform to IS:1148 and high tensile steel rivet bars for structural purposes shall conform to IS:1149.

Welding electrodes shall conform to IS:814 and approval of welding procedure shall be as per IS:823.

Node connectors for space frame shall be Octogonal or Spherical in shape. It shall a minimum tensile strength as specified in the Bills of Quantities. Minimum elogation shall be 7% and hardness 170-240 BHN. The nodes machined out of solid bars shall conform to IS:2062 and the casing shall be as per IS:1030.

The following variety of steel shall be used for structural purposes :

ST-42S: It shall be used for all types of structures (riverted and bolted) including those subjected to dynamic loading and where fatigue, wide fluctuations of stresses, reversal of stresses and great restraint are involved. It shall be suitable for welded structures provided that the thickness of the material does not exceed 20mm.

ST-42W : Fusion welding quality steel, conforming to IS:2062 shall be used for structures subject to dynamic loading where welding is employed for fabrication and where fatigue, wide fluctuation of stresses, reversal of stresses and great restraints are involeved.

Structural steel tubes (ERW) used for building construction shall be hot finished tubes conforming to IS:1161/IS:1239/IS:806. tubes shall be designated by their nominal bore and shall be classified as light, medium and heavy as per IS:1161. tubes of thickenss lower than light tubes shall not be permitted.

Unless mentioned otherwise, fusion welding quality steel ST-42w shall be used for all the structural steel works and tubes shall be YST 21 conforming to IS:806.

The chemical and mechanical properties for structural steel shall be as stated below :

CHEMICAL COMPOSITION OF STEEL

Steel Maximum percentage

designationCorbon Sulphar Phosphorous

ST-42W 0.23 0.06 0.06ST-42S 0.25/0.28 0.06 0.06ST-42O 0.07

MECHANICAL PROPERTIES OF STEEL

Steel Type

Class of Steel Product

Nominal thickness / dia mm

Tensile strength kg/mm2

Yield stress min. kg/mm2

% elongation

ST-42-W (Fusion welding quality &

ST-42-S (Standard quality)

Plate sections (For example, angles, tees, beams, channels etc..) And flats

Below 6 mm only bend test shall be required. 6 mm and upto 20 mm Over 20 upto 40 mm Over 40 mm

42 to 54

42 to 54

42 to 54

26

24

23

23

23

23

Bars (round, square and Hexagonal)

Below 10 only bend test shall be required.Over 10 mm upto 20 mmOver 20 mm

42 to 54

42 to 54

26

24

23

23ST-42-O (Ordinary quality)

Plate sections (for example angles, tees, beams, channels, etc.)

Below 6 only bend test shall be required.

6mm and 42 to 54 26 23

and flats above

Bars (round, square and Hexagonal)

Below 10mm only bend test shall be required.10 mm and above

42 to 54 26 23

15.2.0 Test certificate :

7.2.1 When the steel is supplied by the Contractor, test certificate of the manufacturerer shall be obtained according to IS:2062 and other relevant Indian Standards. Notwithstanding the manufacturer’s certificates, the Consultant/architect may ask for testing of material in approved test laboratory. The test results shall satisfy the requirements of the relevant Indian Standards. Whenever quality certificates are missing or incomplete or where material quality differs forom standard specifications, the Contractor shall conduct all appropriate tests as directed by the consultant/architect at his own cost. Materials for which test certificates are not available or for which test results do not comply with relevant IS standard shall not be used.

15.3.0 Storage :

Storage of structural steel shall be as per IS:4082. Steel materials supplied by contractor shall be marked for identification and each lot shall be accompanied by manufacturer’s quality certificate, conforming to chemical and emchanical characterists as per relevant IS codes. All steel furnished by suppliers shall be checked, sorted out, straightened and arranged by grade and quantities in stores.

Welding wire and electrodes shall be stored separately by qualities and lots inside a dry and enclosed room in compliance with IS:816 and as directed by Engineer-in-charge. Each lot of electrode, bolts nuts, etc. shall be accompanied by manufacturer’s test certificate.

16.0 ANTI TERMITE TREATMENT :-16.1 SCOPEThe scope of job is to form a chemically treated soil barrier to prevent growth of nests or colonies of the sub terrianian termites.16.2 MATERIALS :The following chemical (as specified) in water emulsion shall be used :

Chemicals Concentration (by weight) Chloropyrifos 1.0%

16.3 PRE-CONSTRUCTION CHEMICAL TREATMENT :

Hand operated pressure pumps shall be used for uniform spraying and proper check shall be maintained to ensure that specified quantity of chemical is used for the required area.

16.4 TIME OF APPLICATION

Anti-termite treatment shall start in foundation trenches and pits before laying the leveling course of PCC. The PCC shall be done only after the chemical emulsion has been obsorbed by the soil and surface is quite dry. Treatment should not be carried out when it is raining or the soil is wet. The treated soil barriers shall not be disturbed after they are formed and if by chance, they are disturbed, the same shall be made good before laying the PCC.

16.5 PROCEDURE :

Treatment of Column Pits, Wall Trenches and Basement Excavation :-The bottom surface and sides (upto 300mm) shall be treated with chemical at the rate of 5 litres/sq.MThe portion of the column foundations and the retaining walls coming in contact with the backfill, the structure shall be treated at the rate of 15 litres/sq.M of the vertical surface. If water is used for ramming the earth fill then treatment shall be carried out after the ramming operation is completed by rodding the earth at 150mm c/c close to the structure surface and spraying the required quantity of chemical. For RCC framed structures using 1:2:4 or richer concrete the treatment shall start from a depth of 500 mm below ground level and there is no need to start the treatment from the bottom of excavation for columns and plinth beams. The earth from 500mm below the ground level and above shall be treated as described in previous paragraph. However,

for RCC frame structure, there shall be no chemical treatment for column foundations. Treatment of top Surface of Plinth Filling :-The top surface of filled earth within plinth walls shall be treated with chemical emulsion at the rate of 5 litres/sq. M before the subgrade of floor is laid. Holes upto 50-70mm deep at 150mm centres shall be made to facilitate saturation of the soil with chemical emulsion.Treatment of Junction of Wall and Floor :-To achieve continuity of vertical chemical barrier on inner wall surfaces, small channels of 30 x 30mm shall be made at all the junctions before laying the subgrade and rod holes shall be made upto ground level at 150mm centres and chemical emulsion shall be poured at 15 litres/sq. M of the vertical surface.Treatment of soil along external perimeter of Buildings :-After the building is complete, rod holes shall be made along external perlmeter at 150 mm centres and 300mm deep and these holes shall be filled with chemical emulsion at 5 litres/running metre of perimeter.

16.6 RECORD OF CHEMICAL USED :A detail record of quantity of chemical used for each operation shall be kept at site duly approved by Engg.-in-Charge/Architects.

16.7 GUARANTEE The contractor shall give a guarantee of 10 years for effective anti-termite treatment barrier.

16.8 MEASUREMENT :The measurement shall be made in square metres on the basis of the plinth area of the building at plinth level only for all operations described above . Nothing extra shall be measured.

17.0.0 Tiles :

17.1.0 Terrazzo Tiles :

Terrazzo tiles shall generally conform to the standards prescribed in IS:1237 in all respects.


a. All tiles to be used shall be heavy duty flooring tiles only, conforming to clause 3 of IS:1237.

b. Tiles shall be manufactured from cement, natural aggregate and colouring pigment (where required) as specified in clause 4 of IS:1237, under hydraulic pressure not less than 140 kg/sqcm and shall be given the first griding with machine before delivery to site.

c. Manufacturing process of tiles shall conform to the requirement given in clause 5 of IS;1237.

d. Unless otherwise stated, the size of terrazzo flooring tiles shall be as follows :

Length (mm) Breadth (mm) Thickness (mm)200250300

200250300

202225

However, special shapes and sizes of tiles can be asked for by the client. In such as case, the manufacturer/supplier shall ensure to supply the tiels only int he specified shape and size.

e. Tolerances on length or breadth of tiles shall be +/- 1 mm. In addition, the difference in length of side between the longest side and shorter side in the sample shall not exceed 1mm. Tolerance on thickness shall be +/- 5 mm. In addition, the difference in thickness between the thickest and the thinnest tile in the sample shall not exceed 3 mm.

f. The minimum thickness of wearing layer for the various classes of terrazzo flooring tiles shall be as specified in Table 1 to IS:1237. Unless otherwise specified, the tiles shall be supplied with intial grinding and grouting of the wearing layer.

g. The wearing layer of the tiles shall be free from projections, depressions, cracks, holes, cavities and other blemishes.

17.1.2 Physical requirements :

The tests on tiles to check physical requirements shall not be carried out ealrier than 28 days from the date of manufacture.

a. Client can ask for any physical test to verify the acceptability of the tiles. All physical tests shall be carried out as per Appendex A to F of IS:1237 as applicable, depending on the tests to be done.

b. On testing, the physical requriements shall conform to the acceptability limits specified in clause 11 of IS:1237. Tiles, failing to meet acceptability criteria, shall be rejected.

17.1.3 Sampling :

Sampling and inspection shall be carried out as per clause 14 of IS;1237.

17.1.4 Marking :

All tiles shall be legibly marked on the back with the name of the manufacturer or his trade mark. Heavy duty tiles shall be marked ‘H’

17.2.0 Ceramic Tiles :

Ceramic tiles to be used for flooring and dadoing shall conform to IS:13712. These shall be procured from approved maufacturers and a few approved samples shall be submitted to Client/Consultant/architect for future reference.


The tiles shall be of vitreous ware and shall be free from deleterious, substances. The finished tile, when fractured shall appear fine grained in texture, dense and hemogeneous. The tiles shall be sound, true to shape , flat, free from flaws and other manufacturing defects affecting their utility.

Glazed ceramic tiles : Glazed ceramic tiles shall be highly pressed, single fired, red body, top glazed white or coloured, plain or with designs. The body glazed ceramic tiles should consists of high grade clay and minerals and well pressed in hydraulic presses and glaze should be a combination of different minerals. The top surface shall be glazed with stable gloss/semi-gloss/matt finish of uniform colour and texture. The edges and under side of the tiles shall be free from glaze and shall have ribs or indentations so that these may adhere properly to the surface below.

Floor tiles : These tiles should have high strength, good resistance to wear and tear, low water absorption and sufficient anti-skid properties and all shall conform to IS: 13755. Based on the properties of the glaze and hardness, floor tiles are categorized abrasion resistant-wise as group II to V. The tiles required in building and walkway shall confirm to Group IV .

Wall tiles : These tiles shall be single fast fired having medium water absorption and high strength characteristics. These tiles shall have high glaze and better adhesion to wall and shall conform to IS:13753. Wall tiles shall be glossy/semi-glossy, matt glaze finish, white or coloured, plain or printed special printed and premium printed/designer etc..

Vitrified ceramic unpolished/polished tiles : These tiles are of different shades having monolithic body that is pressed in very high tonnage press and fired to high temperature. The tiles shall be homogeneous and compact through out the entire body with very high strength, low porosity and extreme surface hardness, high resistance to abrasion by chemicals and shall conform to IS:4457. The tiles shall eb with smooth surface or textured anti-skid finish surface. Polished vitrified ceramic floor tiles shall be homogeneous heavy and tough with highly reflective polished surface but non-slippery.

17.2.2 Sampling & Testing :

Sampling shall be done as per IS:13711 and testing shall be done as per IS:13630. Samples of each type/design/finish/print/size/colour of tiles shall be submitted well in advance to the Architect/consultant for approval at the contractor’s cost. The consultant/architect shall retain approved sample. Tiles shall be procured from a single approved source who can provide products of consistent wquality and physical properties.

17.2.3 Storage :

The tiles shall be delivered in original containers with seals unbroken. Adequate precaution shall be taken to prevent accidental damage to tiles while unloading and these shall be stored under cover in manner approved by the Engineer-in-charge.

17.2.4 Acceptance criteria :

Acceptance criteria shall be as per IS:13711.

17.3.0 Anti-skid tiles :


The tiles shall be free from any flaw, fissure, crack or any other manufacturing defect that may adversely affect their utility. They shall be flat, square, true to shape and sound.

Finish shall be matt finish.

Compressive strength shall not be less than 70 N/mm2.

Maximum permissible water absorption shall be 2 percent.

Maximum permissible average wear shall be 2mm. However, for an individual specimen this value shall be 2.5 mm.

Tiles meant for dadoing purposes shall not be used for flooring.

17.3.2 Sampling and testing :

Same as that of ‘Ceramic tiles’.

17.3.3 Acceptance criteria :

Same as that of ‘Ceramic tiles’.

17.4.0 Acid Resistant tiles :


The tiles shall be of viterous ware and shall be free form deleterious, substances. The finished tile, when fractured shall appear fine grained in texture, dense and homogeneous. The tiles shall be sound, true to shape, flat free from flaws and other manufactureing defects affecting thier utility.

Size of ceramic unglazed vitereous acid resistant tiles shall be as follows :

i. 100 x 100 (or) 98.5 x 98.5mmii. 150 x 150 (or) 148.5 x 148.5mmiii. 200 x 200 (or) 198.5 x 198.5mm

Half tiles for use as full tiles, if manufactued, shall have dimensions that shall be such as to make the half tiles, when jointed tother, match witht he dimension of a full tile.

Thickness shall be 25,20,12 & 10mm.

Depth of the grooves on the underside of tiles shall not exceed 3mm.

Tolerance in length, width and thickness of tiles shall be +/-2.5 percent.

Half tiles for use as full tiles, if manufactured, shall have dimensions that shall be such as to make the half tiles, when jointed together match witht he dimension of a full tile.

Tolerances in length width and thickness of the tiles shall be +/- 2.5 percent. Other requirements shall be in accordance with Table-1 of IS:4457.

17.5 MARBLE MOSAIC TILE FLOORING :

17.5.1 SCOPE :This covers the laying and finishing of cement concrete flooring tiles in floors, wall, staircases, etc.17.5.2 MATERIALS :Cement, sand, terrazo tiles shall conform to the specifications detailed in the Materials Section.Mixing of mortar shall be done in accordance with the specification laid down under “Cement Mortars”.17.5.3 LAYING :Subgrade concrete or the RCC slab on which tiles are to be laid shall be cleaned, wetted and mopped. The bedding of the tiles shall be with cement mortar 1:5 or as specified. The average thickness of mortar shall be 30mm and thickness at any place shall not be less than 10mm.Lime mortar bedding shall be spread, tamped and corrected to proper levels and allowed to harden for a day before the tiles are laid.Over this bedding, neat grey cement slurry of honey like consistency shall be spread at the rate of 4.4 kg/sq.mt over such an area that would accommodate 20 tiles.Before laying, the tiles shall be soaked in water for at least 20 minutes and then allowed to dry for about 10 minutes. It is necessary to have tiles damp but not wet when they are laid. Tiles shall be fixed by gently tapping with a wooden mallet till they are properly bedded and in level

with the adjoining tile. The joints shall be kept as thin as possible not exceeding 1.5 mm. Where full-size tiles cannot be fixed, tiles shall be cut to the required size and their edges rubbed to ensure a straight and true joint. Tiles which are fixed in the floor adjoining the wall shall enter not less than 12mm under the plaster, skirting or dado. After the tiles have been laid, excess cement coming out through the joints upto the surface shall be immediately wiped clean.

17.5.4 CURING, POLISHING AND FINISHING :The day after the tiles are laid all joints shall be cleaned of the grey cement with a wire brush. The joints shall after 24 hours be filled with matching cement paste and allowed to set. The same cement slurry shall be applied to the entire surface of the tiles in a thin coat with a view to protect the surface from abrasive damage and fill the pin holes that may exist on the surface.

The floor shall then be kept wet and protected for a minimum period of seven days before starting the polishing. No one shall be allowed to walk on the floor during the first 24 hours immediately after the tiles are laid.

The surface shall thereafter be grounded evenly with machine fitted coarse grade grit block. Water shall be used profusely during grinding. It shall then be covered with a thin coat of cement mixed with colouring pigment to match the topping of the wearing surface of the tile sand second grinding shall then be carried out with machine fitted with fine grade grit blocks.

The final grinding with machine fitted with the finest grade grit blocks shall be carried out after 24 hours of completion of second grinding or before handing over the floor. The entire surface shall be finally washed with weak solution of soft soap in warm water.For small areas or where circumstances so require, hand polishing may be permitted as in the case of skirting, treads and risers of staircase, etc. by the Engg.-in-charge / Architects.

MEASUREMENT :Length and breadth dimensions shall be measured to the correct centimetre before laying skirting, dado or wall plaster and area calculated in square metres correct to two decimal places. No deduction shall be made nor extra amount paid for any opening in the floor area upto 0.5 sq.mt. No extra shall be paid for use of cut tiles nor for laying the tiles at different levels in the same room.

17.6 TILES IN SKIRTING

17.6.1 PREPARATION OF SURFACE :The joints of masonry shall be raked out to a depth of at least 15mm. In case of concrete and plastered surfaces, the surface shall be roughened by hacking. All the surfaces receiving tiles shall be cleaned thoroughly, washed with water and kept wet before the tiling is commenced.

17.6.2 LAYING :12mm thick plaster of CM 1:3 or mixed as specified shall be applied and allowed to harden. The plaster shall be roughened with wire brushes making grooves of at least 2mm deep before the plaster dries. The tiles shall be soaked in water. The tiles shall be buttered with a coat of grey cement slurry and then shall tamped in position corrected to proper planes and lines with a wooden mallet. The tiles shall be set in required pattern and butt jointed with very fine joints. Top of skirting or dado shall be truly horizontal and joints truly vertical unless specified otherwise. The skirting or dado shall rest on the top of flooring. The projection of skirting from the finished wall surface shall not be more than 12mm.

17.6.3 POINTING AND FINISHINGJoints shall be cleaned off grey cement grout with wire brush or trowel to the depth of 2 to 3mm and all dust and loose mortar removed. Joints shall then be flush pointed with white cement added with colouring pigment if required to match the colour of the tiles. The wall shall be kept wet at least for seven days. The finished wall shall not sound hollow when tapped with a wooden mallet.

18.0.0 KOTA/SHAHABAD/CUDDAPAH/ GRANITE STONE :

Kotah/Shahabad/Cuddapah/Granite stone blocks / slabs/tiles to be used for flooring, stairs, dados, skirtings, linings, veenering etc. shall conform to the requirements specified in the schedule of items.


The natural stone slabs shall be procured from selected quality/stock as specified in schedule of items.

These shall be hard, sound, dense and of homogeneous texture and free form cracks, decay, weathering, soft veins and flaws.

They shall be hard and machine-cut of requisite thickness along planes parallel to the natural bed of stone and shall be of uniform size and colour as required.

The exposed surface of stone slabs shall be machine polished to a smooth, even and true plane and the edges shall be chiselled to half its depth, true and square to ensure uniform width of joint.

18.1.2 Marking :

Each type of stone blocks, slabs and tiles supplied at site shall bear the manufacturer’s identification marks or intials.

18.1.3 Sampling and Testing :

a. Samples shall be selected and tested separately for each lot for determining its conformity or otherwise to the requirements of the specification.

b. The number of blocks/slabs/tiles to be selected for sampling shall depend upon the size of the lot and shall be in accordance with Table-2, IS:1130.

c. Contractor shall procure a certifiate from the supplier stating that the blocks, slabs and tiles supplied, comply with the relevant Indian Standards and shall submit it to Client/Consultant.

d. Tests shall be carried out as per methods described in IS:1124 and IS:1122, as applicable.

18.1.4 Causes for rejection :

Stone slabs not ocnforming to the size, colour, texture and other criteria mentioned above shall be rejected by the Client/Consultant

19. Water Proofing All water proofing works to be carried out in this scope of work shall be through the approved agencies / any other reputed approved local agency.

Contractor will be required to submit a guarantee in respect of performance of waterproofing for 10 years on stamp-paper. In addition to this, an amount equal to 10% of cost of waterproofing items shall be retained as retention money for 2 years from the date of completion, which shall be returned only after successful completion of this period.

20.0.0 Paints

20.1.0 Enamel paint :


Paint and enamel shall be of approved quality.Colour for enamels shall conform to IS:5. These shall always meet the requirements (colour and space) of the cilent/consultant/architect.

These shall be pruchased from reputed manufacturers only as directed by the client/consultant.

Under no circumstances the paint shall be diluted with linseed oil or any other material before applciation. The mothod of application shall be as prescribed by the manufactures.

Paint shall not show excessive setting in freshly opened can and shall easily be mixed with paddle to a smooth homogeneous state.

While brushing, the paint shall be easily brushable possess good levelling properties with no running or sagging tendencies.

The paint shall dry to a smooth uniform finish free from roughness, unevenness and other imperfections.

20.1.2 Primer :

Primers shall be red oxide.

20.1.3 Packing and Marking :

Packing and marking of packages of paints, enamels & primers shall be in accordance with IS:5661.

20.1.4 Sampling :

Representative samples of the material shall be drawn as prescribed under 3 of IS:101 whenever directed by the Client/Consultant.

20.1.5 Storage :

Paints of all types shall be stored in a cool dry place, preferably in a godown specifically made for the purpose. In general, storage of paints shall be in accordance with IS:4082.

20.2.0 Plastic emulsion paint :

Plastic emulsion paint for interior and exterior use shall conform to IS:5411 (Parts-1 &2) respectively.


a. The emulsion paint and primers in general shall be of approved quality, colour, shade and brand as directed by the Client/Consultant.

b. The material shall consist of pigments with suitable extenders in suitable proportions, in a medium consisting of any stable synthetic polymer emulsion in water, with suitable other ingredients as may be necessary to produce a material so as to satisfy the requirements of IS standards.

c. The paint, for interior use, shall meet the requirements of IS:5411 (Part-1), on testing. The paint for exterior use shall comply witht he requirements of IS:5411 (Part-2).

d. Any special requirement, if agreed to between the supplier and the Client/Consultant, shall have to be complied with.

20.2.2 Packing and marking :

Unless otherwise specified, the material shall be packed in metal containers lacquered inside with a suitable chemical resistant material.

Each container shall be marked in a manner as specified in clause 4 of IS:5411 (Part-1).

20.2.3 Sampling :

Representative samples of the material shall be drawn as prescribed under 3 of IS:101 whenever directed by the Client/Consultant.

20.2.4 Testing :

a. Tests shall be conducted according to the methods prescribed in IS:101, Appendices A to E of IS:5411 (Part-1) and Appendices A to F of IS:5411 (Part-2), as applicable.

b. Unless otherwise specified, pure chemicals and distilled water (conforming to IS:1070) shall be employed in tests.

20.2.5 Storage :

Paints shall be delivered in sealed containers. They shall be stored in accordance with the provisions of IS:4082.

20.3.0 Cement paint :


Cement paint shall conform tot he requirements laid downin IS:5410.

The materail shall be in powder form, free from lumps.

When mixed with required volume of water, it shall be suitable for use on porous surface of masonry, concrete, stucco, common brick and rough palster work, except gypsum plaster.

20.3.2 Scaffolding :

Wherever scaffolding is necessary, it shall be erected in such a way that as far as possible no part of scaffolding shall rest against the surface to be white or colour washed.

A properly secured and well tied suspended paltform may also be used for whitewashing and colour washing.

Where ladders are used, pieces of old gunny bags shall be tied at top and bottom to prevent scratches to the walls and floors.

For whitewashing of ceilings, proper stage scafolding may be erected, where necessary.

20.4.0 White wash, colour wash :

White washign and colour washing on concrete, masonry and plaster surfaces in buildings shall conform to IS:6278.

20.4.1 Materials :

Following materials are used to prepare whitewash and colour wash.

Lime used for whitewashing shall be freshly burnt fat line (also classified as class ‘C’ lime) conforming to IS:712. It shall be white in colour.

Water shall be clear, free from all organic and suspended impurities. Water shall meet the requriements mentioned in the clause 4.3 of IS:456. Potable water is generally considered suitable for this purpose.

Colour wash shall be done with mineral colours not affected by lime added to white wash. No colour wash shall be done until a sample of the colour wash to the required shade or tint has been approved by the architect/consultant. The colour shall be of even shade over the whole surface. If it is blotchy or otherwise badly applied, it shall be redone by the contractor at his own cost.

Gum or glue.

Sodium chloride to be used shall conform to IS:253 or grade II of IS:797.

Ultramarine Blue or Indigo shall conform to IS:55.

Pigments :

i. Yellow and red ochre - The ochres shall conform to IS:44. The solid lump shall be crushed to powder.

ii. Blue vitriol - Fresh crystals of hydrous copper sulphate (blue vitriol) shall conform to IS:261 and shall be grounded to fine powder.

20.4.2 Scaffolding : Same as for ‘Cement Part)

20.5.0 Distemper :

20.5.1 Dry distemper :

The powdered / dry distemper shall be approved colour and of approved brand and shall conform to the requirements prescribed in IS:427 & 428. The shade shall be got approved from the

architect/.consultant before application. The dry distemper of approved brand and colur shall be stirred slowly in clean water using 6 declitres (0.6 litres) of water per kg of distemper or as specified by the manufacturer. Warm water shall be used. It shall be allowed to stand for atleast 30 minutes before use. The mixture shall be well stirred before and during use to maintain an even consistency. Distemper shall not be mixed in larger quantity than is actually required for one day’s work.

20.5.2 Oil bound distemper :

The specifications and condition for this shall be the same as that applicable for dry distemper, except that oil bound distemper of approved make, shade and colour shall be used after applying priming coat of petrifying liquid or other primer as may be recommended by the manufacturer / supplier. It shall conform to IS:428.

20.5.3 Scaffolding :

Same as for ‘Cement Paint’.

20.6.0 Heritage wall finish :

It shall be from Bakelite Hylam Ltd or equivalent as approved by the architect/consultant. It shall conform to International Standards.

It shall be two-component finish. It shall be easily applicable using trowels and no special tools and training shall be required for application. The single coat application thickness shall be 1.52mm of colour and texture as approved by the architect. It shall be weather and fade reistant water and damp reistant, durable, highly washable. It shall be acid and alkali reistant, high abration reistant, non-toxic and shall be capable to take any shade. It can be applied on wide vatriety of suface like cement mortar, plywood, plaster baord, AC sheet, gypsum palster or any other absorbent material to get homogenous layer.

It shall be incombustible and flexible. It shall be good fire reistant, anti-fungal, good impact reistant having adhesion strength more than 8kg/sqcm. There shall not be any development of hairline cracks and no peeling off shall occur after the maximum drying time of 4 hours and during period of 2 days.

20.7.0 Acrylic emulsion paint :

It shall be water based acrylic co-polymer emulsion with rutile titanium-dio-oxide and other selected pigment and fungicide. It shall exhibit excellent adhension to plaster and cement surface and shall reist deterioration by alkaly salts. The paint film shall allow the moisture in the wall to escape without peeling or blistering the paint. After it is dried, the paint should be able to withstand washing with mild soap and water without any deterioration in colour or without showing flaking, blistering or peeling.

20.8 CEMENT PAINTING

All outside exposed surfaces of masonary and concrete shall be painted with cement paint of approved make and shade .The surface shall be thoroughly cleaned & wetted with water just before the painting commence.Cement paint shall be mixed with water as per the specification of manufacturer. Cement paint which can be used within an hour of its mixing shall be prepared

20.9 PLASTIC EMULSION PAINT :20.9.1 MATERIAL :The plastic emulsion paint shall be of approved brand and manufacturer and of the required shade.20.9.2 APPLICATIONThe number of coats shall be as specified. The paint shall be applied with brushes or rollers. The thinning of the emulsion is to be done with water only and not turpentine. The quantity of water to be added shall be as specified by the manufacturer. The surface finish shall be flat, velvety and smooth.20.9.3 PRECAUTIONS :Old brushes shall not be used. Oil based Putties for filling in cracks, depressions, etc. shall not be used. Splashes if any, shall be cleaned immediately as they will be difficult to remove afterwards. Washing of the surface shall not be done within 3 to 4 week of application.Other details shall be as Detailed in Oil Bound Distemper.

21.0.0 STEEL AND ALUMINIUM JOINERY

21.1.0 STEEL JOINERY :


Steel windows, ventinators and fixed lights shall conform generally to the provisions prescribed in IS:1033 and IS:1361 and also dimensionally to the details shown on the drawing. Rolled steel sections for the fabrication of steel joinery and material to be used in the manufacture of the sections shall conform to the requirements specified in IS:7452.18.1.2 Pressed steel door frames :

a. Steel door frames shall be manufactured using 35 x 35 x 5 angle frame and 25 x 25 x 3 angle members bracing with 16 gauge MS sheet stitched welded to door shutter frame.

b. Steel doorframes shall be made true to profile and dimensions as specified in IS:4351 or as per drawings.

c. Each doorframe shall be consist of hinge jamb, lock jamb, head and , if required, angle threshold. The whole shall be welded or rigidly fixed together by mechanical means. Where no angle threshold is required, temporary base tie shall be screwed to the feet of rames in order to form a rigid unit.

d. Fixing lugs shall have a head made of 25 wide x 1.6mm thick steel strip of specified length and a spilit end tall 40 mm wide x 1 mm thick and 200 long. There shall be a minimum of three lugs to each jamb.

e. Hinges shall be made of 2.5mm thick mild steel with a zinc coated removable pin of 6 mm diameter (conforming to IS:1341)

f. Mortor guards shall be provided as specified and these shall be welded to the frame at the head of the frame for double shutter doors to make provision for bolts.

g. There shall be an adjustable lock strike plate of steel, complete with mortar guard, to make provision for locks or latches complying with the relevant Indian Standards. Lock-strike plates shall be of galvanized mild steel and fixed at 75cm to 90cm from finished floor level.

h. For side-hung door there shall not be less than three buffers of rubber or other suitable material inserted in holes in the rebate and one shall be located on the centre line of the lock-strike plate. For double-shutter doors there shall be two buffers of rubber or similar suitable material inserted in holes in the rebate in the lock jamb only at the head and spaced 15cm at either side of the centre line of the door.

21.1.2 Steel windows & ventilators :

a. Steel windows, and ventilators shall be manufactured from ordinary quality structural steel conforming to IS:1977. In case of composite units consisting of a combination of two or more units of windows and ventilators different units shall be coupled by using coupling sections made fromapproved Z sections.. The weight of various rolled steel sections used for the manufacture of windows and ventilators shall be as per those specified in IS:1038 unless otherwise specified.

b. Frames shall show no wrap or inferior workmanship. All openable windows shall be designed to open outside with glazing 5 mm thick glass on the outside of the frames unless mentioned otherwise. The hinges for side-hung shutters shall be of projecting non-friction type and for top hung plain type unless specified. Hinge pins and washers shall be of galvanised steel or aluminium alloy of suitable thickness. Weather bars shall be titted to fabricated coupling section wherever required.

c. Steel ventilators with fixed louvers shall comprise of 16 gauge pressed steel guides spaced at 50mmc/c for reciving glass louvers 4mm thick. MS pressed steel louvers shall be fabricated out of 16 gauge sheet bent to ‘Z’ shape and shall be tack welded to frames.

21.1.3 Rolling Shutters :

a. Rolling shutters shall in general conform to IS:6248 and shall be fabricated out of mild steel laths having interlocking curls at both edges with 12mm minimum depth of corrugation for resisting manual pressure and normal wind pressure. The laths shall be fabricated out of cold rolled steel strips. Conforming to IS:4030. Each lath section shall be continuous single piece without any welded joint. The water shielding surface shall be kept on the side exposed to atmosphere. When interlocked the roling centres of the laths shall be a 75mm centres minimum. Each alternate lath section shall be fitted with malleable cast iron (conforming to IS:2108) or mild steel clips securely riveted at either end and thus preventing their lateral movement and wearing of their edges against the guide channels. The clips shall be so designed so as to fit the contour of the lath sections.

b. The shutter shall be provided with bottom lock plate fabricated out of 3.15mm thick mild steel sheet reinforced by an angle iron stiffener of not less than 35x35x5 mm size at the bottom and MS flat at the top. It shall be interlocked with the bottom lath so as to have a firm contact agaisnt the sill while the shutter is in closed position. The lock plate shall be fitted with necessary sliding bolts and pulling handles usable from both interior and exterior sides of the plate.

c. The guide channels shall be either of rolled section or one piece pressed construction and shall be of thickenss not less than 3.5 mm. The depth and width of guides shall be such that there is sufficient clearance between the curtain and the inner surface of guides to ensure not only free movement of curtain but holding it firmly at the ends upto a maximum wind pressure of 200kg/sqm and preventing it from rattling as well. The minimum depth of channel shall be 65mm for widths upto 3.50 m and 75mm for widths more than 3.50 metres. Width of guide channel shall be 25mm for lath sections with depth of corrugation 12mm. The guide channel shall have minimum 3 numbers of MS holdfasts and the maximum spacing shall however, not exceed 750mm. Provision of MS stopper at the maximum height shall be made ont he guide channels.

d. Bracket plates shall be of hexagonal, square or circular contour and shall have a U-shaped cast iron or mild steel clamp welded to it at the centre. The bracket plate shall be made out of 0.9 mm thick mild steel plate and size shall conform to the requirements in IS code.The plate shall be held in position rigidly by means of suitable foundation bolts and in the case of push and pull type shutter, extra tying to the guide channel by means of a square bar not less than 20mm size shall be provided.

e. The suspension shaft of the roller shall be made of heavy duty steel pipe conforming to IS:1161 and shall be of adequate diameter to have minimum defletion with suitable flange coupling. The pipes of the shaft that are clamped to the brackets shall be fitted with rotatable cast iron pulleys to which the curtain is attached. The pulleys and the pipe shaft shall be connected by means of pre-tensioned helical springs, flat or coil type conforming to grade2 of IS:4454 hardened and tempered.

f. Ball bearings provided for rolling shutters shall be two-row self-aligning type with special cast iron coatings at the extreme pulleys at either end. The pulleys shall be interconnected with a cage formed out of mild steel flats of at least 32 x 6mm and spaced at 15cm.

g. The hood cover shall be made of 0.9 mm thick MS sheets with necessary stiffeners and framework. The cover shall be of hexagonal, square or circular contour depending on the bracket plate contour. This shall be supported at regular intervals to prevent sagging.

h. Unless otherwise specified for overall area of rolling shutters upto 10 square metres, pull and push type hand operated shutters with ball bearings shall be provided. For areas more than 10 sq.m and upto 35 sq.m mechanical operated gear type will ball bearings shall be provided. A pulling hook shall be provided for each of the rolling shutters. The pulling

hook shall consist of 12mm diameter rod with a hook at one end and a ring at the other end of eduquate length.

21.1.5 Supply : All doors frames, windows and ventilators shall be despatched with the opening parts suitably secured to preserve alignment when fixing and glazing.

Fixing lugs, couplings, fittings and all hardware shall be despatched separately.

Composite windows shall be despatched uncoupled.

21.2.0 Aluminium Joinery

21.2.1.General requirements :

a. Anodised/powder coated aluminium joinery shall conform to the requirements specified in IS:1948 and 1949 and shall be of Hindalco, Jindal or equivalent reputed make with size and design as per relevant drawings. The average thickness of anodised /powder coat shall not be less than 15 microns (IS:7088) and shall be matt finished.

b. Aluminium doors, windows, ventilators shall be made of aluminium alloy conforming to IS:733 and sections shall generally conform to IS:1948. Coupling members forming composite sections shall be of extruded aluminium alloy section. All frames shall have corners machine-jointed to a true right angle. For side hung shutters, hinges shall normally be of projecting type made of aluminium alloy and riveted/machine-jointed to frame and shall have stainless steel/aluminium alloy pins. Irrespective of the hinges being anodised or not, the aluminium alloy pins shall be anodised(minimum 15 micron) / powder coated(minimum 50 micron) and shall be sealed with oil or wax. Handles, peg stays shall be of approved heavy-duty quality aluminium or its alloy conforming to IS specifications.

c. The doorframe and shutters shall be single action or double action as indicated in the drawing with hydraulic door closer in the floor. The doors shall be provided with anodized aluminium door handles for full width of door inside and outside. The door frame shall be provided with approved anchors spaced not more than 900 mm centres.

d. Before erecting, frames coming into contact with concrete, masonry, plaster or dissimilar metals, shall be coated with a thick

layer of clear transparent lacquuer based on methacrylates or cellulose bytyrate, which is compatible with zinc chromate to protect the surface from wet cement during installation. This lacquer coating shall be removed after installation is completed. Before handing over, the aluminium work shall be washed with mild solution of non-alkali soap and water.

Gaskets to be used shall be made of neoprene of approved make and shall be approved by the Client/Consultant before fixing in position. The sealant shall be of approved make and shall be duly approved before application. Aluminium doors, windows and ventilators after fixing in position shall be watertight and airtight.

Aluminium material used shall be specially anodised / powder coated for protection against corrosion in marine environment in approved shade. The anodic coating shall conform to IS:1868 and shall have minimum thickness of 15 microns when measured as per IS:660/2. The anodic coating shall be double sealed or alternatively sealed with steam and shall be of minimum thickness of 15 microns. The anodic coating shall be tested in a laboratory by Eddy current method as per IS:6012 for thickness. Sulphuric acid shall be used as the electrolyte for the anodic process.

Wherever specified, polyster grade machine applied power coating of minimum thickness 50 microns shall be provided and such coating shall be of approved shade.

21.2.2 Supply :

Same as for steel joinery.

21.2.3 Unloading and Stacking :The fabricated frames shall be transported, unloaded, stacked and handled in a careful manner. They shall be stacked on edge on level bearers and supported evenly. Al precautions shall be taken to ensure that the frames are not damaged or distorted in any manner. As decided by the Client/Consultant, the damaged or distorted frames shall be replaced and made good at the expense of the contractor. Generally, storage of doors and frames shall conform to IS:4082.

21.2.4 Sampling :

Sampling and criteria for conformity for steel/aluminium doors, windows, ventilators and fixed lights shall be as prescribed in the respective Indian Standards.

22.0.0 Hardware for joinery works


a. Fittings shall be of MS, brass, aluminium or as specified. These shall be smooth and free from sharp edges, corners, flaws and other defects. Screw holes shall be countersunk to suit the head of specified wood screws. All hinge pins shall be of steel and their rivetted heads shall be well formed.

b. MS fittings shall be finished bright or black enamelled or copper oxidised or painted as specified. Brass fittings shall be finished bright (brass), oxidised or chromium plated (electroplated) and aluminium fittings shall be finished bright or anodised or powder coated or as specified. Fittings shall be approved by the Client/Consultant before fixing. Screws used for fittings shall be of the same metal as that of the fittings. However, anodised cadmium / chromium plated brass screws of approved quality shall be used for fixing aluminium fittings. In case of renewal works, the new fittings shall as far as possible, match with he existing ones. Screws shall be driven home with screw driver and not hamemred in.

22.2.0 Hinges

22.2.1 Butt Hinges :

These shall be mild steel but Hinges (medium), brass butt Hinges (light/ordinary), brass butt Hinge (heavy), brass oxidised butt V (light/ordinary), brass oxidised butt V (heavy), extruded aluminium alloy butt V or as specified. Brass and MS butt Hinges shall generally conform to IS:205 and IS:1341 respectively.

22.2.2 Parliament Hinges :These shall be mild steel or cast brass or as specified and shall generally conform to IS:362.

22.2.3 Spring Hinges :

These shall be made of MS or brass casing with steel spring and shall conform generally to IS:453. Hinges shall work smoothly and hold the door shutters truly vertical in closed position. The size of spring Hinge shall be taken as length of its plate.

22.2.4 Piano Hinges :

These shall conform to IS:3818 and shall be made of mild steel, brass, or aluminium alloy sheets. Mild steel Hinges shall be finished with anticorrosive treatment or plating of brass or nickel as specified. Piano hinges shall be fixed for the full height of cupboard shutters.

22.2.5 Tee Hinges :

These shall be made of MS sheets and finished bright. They shall conform to IS:206.

22.3.0 Sliding Door Bolts :

These shall be of aluminium and conform to IS:2681. They shall be capable of smooth sliding action. Alternative materials may be adopted on the approval of the Client/Consultant for specific locations.

22.4.0 Door latch :

These shall be mild steel, brass or as specified and shall be capable of smooth sliding action.

22.5.0 Tower Bolts :

Tower bolts may be of one of the following types :

Brass barrel tower bolt with cast brass barallel and rolled or drawn brass bolt.

Brass barrel tower bolt with brass sheet barallel and rolled or drawn brass bolt.

Anodised aluminium barrel tower botl with barrel and bolt of extruded sections of aluminium alloy (10/12mm dia shoot).

MS tower bolt with barrel.

These shall generally conform to IS:204 Parts 1&2) steel spring and ball shall be provided between the bolt and the barrel.

22.6.0 Door handles :

These shall be cast brass or MS or aluminium of specified size and of the shape and pattern as approved by Client/Consultant. These shall generaly conform to IS;208. The size of the handle shall be determined by the inside grip of the handle. Door handles shall be of

100 mm size and window handles of 75 mm size unless otherwise specified. These shall be fixed with 25mm long screws.

22.7.0 Mortice Lock :

Mortice lock with latch and pair of lever handles shall have steel or brass casing and brass bolts and shall be right or left handed as shown in the drawing or as directed by the Client/Consultant. It shall be fo the approved quality and shall conform to IS;2209. The shape and pattern shall be approved by the Client/Consultant. The size of the lock shall be determined by its length. The lock for single leaf door shall have plain face and that for double leaf door shall have a rebated face. Lever handles with springs shall be mounted on plates and shall weigh not less than 0.5 kg per pair. These shall be of brass, finished bright chromium palted or oxidised.

22.8.0 Floor door stopper :

This shall be made of cast brass or anodised aluminium and shall have a rubber cushion. The type and pattern shall be as approved by the Client/Consultant.

22.9.0 Hooks and Eyes :

These shall be of hard drawn brass or steel and shall generally conform to IS:207.

22.10.0 Casement Window Fasteners :

These shall be made of cast brass, anodised alumiumum or choromium plated steel. Casement fasterners for single leaf window shutter shall be left or right handed as specified. These shall nto weigh less than 0.20 kg per fastener.

22.11.0 Casement Stays :

These shall be made of cast brass, anodised aluminium or chromium plated steel. The stay shall be made from channel section and shall not weigh less than that indicated below :

200 mm --- 0.24 kg each250mm --- 0.28 kg each300 mm --- 0.33 kg each

The shape and pattern of stays shall be approved by the Client/Consultant.

These shall be made of cast brass, anodised aluminium or C.P. Steel. The shape and pattern shall be approved by the Client/Consultant. It shall not weigh less than 0.20 kg each.

22.12.0 Fan /Light Pivots :

These shall be made of cast brass or C.P. Steel and shall generally conform to IS:1837. The base and socket plate shall be made from minimum 3.15 mm thick brass or CP steel plate and projected pivot shall not tbe less than 12 mm in diameter and 12 mm in length, cast in single pieces withthe base palte.

22.13.0 Fan light catch :

These shall be made of cast brass or CP steel and shall generally conform to IS:364. Steel springs of the catch shall be 0.90mm dia 6 coils 12 mm internal diameter and 20 mm long. The pattern and the shape of the catch shall be as approved by the Client/Consultant.

22.14.0 Chain with hook for fan light :

This shall be made of hard drawn brass or cast brass or CP steel welded or twisted as specified and shall generally conform to IS:3828. One end of the chain shall be provided with an eye and the other end with staple. The minimum thickness of plates shall be 2.24 mm and the chain shall be 300 mm long made from minimum 4 mm hard drawn wire.

22.15.0 Hasp and staple :

Hasp and staple (safety type) shall be made of cast brass or CP steel or alumimium and generally conform to IS:363. The hinge pin whih in all cases shall be of mild steel, shall be firm and its riveted head well formed. The movement of the hasp shall be free, easy and square and shall not have any play or shake. The hasp shall fit the staple correctly. The size shall be determined by the length of the bigger leaf of the hasp.

22.16.0 Cupboard lock :

These shall be made of cast brass conforming to IS;729 and shall be of approved make. The lock shall be easy in working having duplicate keys.

22.17.0 Hydraulic door closer :

These shall conform to IS:3564 and be of brand approved by the Client/Consultant for both left and right hand openings.

Hardware and fixtures shall be as specified in the drawings or shcedule of quanitites. All hardware and fixtures shall be able to withstand repeated use. Door closer shall be suitable for doors weighing 61-80 kg. Unless otherwise stated. Each closer shall be guaranteed against manufacturing defect for one year and any defect found within this period shall be rectified or the closer replaced free of charge. Concealed door closers shall be either floor mounted or transome sounted, suitable for installation with metal doors. It shall conform to the performance requirements and endurance test stated in IS;3564.

23.0.0 GLAZING :


23.1.1 The glass used for glazing works shall be of the best quality transparent and free from blisters, specks, bubbles, stones, scratches, veins, air holes and other defects so as to give a clear visibility through the glass.

23.1.2 All glass shall be procured from a reputed manufacturer and duly approved by Client/Consultant. The glass supplied at site shall conform to the requirements indicated in the schedule of items and the following Indian Standards listed below :

a. Sheet glass of selected quality as pe IS:2835.b. Wired and wired-figured glass as per IS:5437.

23.2.0 Sheet glass :

General :

Sheet glass is a flat transparent glass made by blowing or drawing and it shall be, to the extent possible, colourless as judged by the un-aided eye except when viewed edgewise showing a light blue to green tint.

Unless otherwise specified sheet glass shall weigh 7.5 kg/sqm for panes upto 600x600 mm. For panes larger than 600x600mm and upto 800x800 mm glass weighting not less than 8.7 kg/sqm shall be used. For bigger panes upto 900x900 mm glass weighting not less than 11.25 kg/sqm shall be used.

Sheet glass shall be patent flattened glass of best quality and for glazing and framing purposes shall conform to IS:1761.

23.2.2 Testing :

Tests for waviness, warpage, lines, etc. shall be done as per Appendix - A of IS:2835 and test for thickness shall be doen as per Appendix-B of IS:2835.

Any glass, found to suffer from defects beyond allowable limits (as per Table-2, IS;2835) shall be rejected.

23.2.3 Sampling :

Reperesentative samples of the amterial shall be drawn and adjudged for conformity with this specification as prescribed in Appendix C, IS;2835.

23.2.4 Packing and marking :

Sheet glass shall be packed as agreed to between the purchaser and the supplier. The packages shall be marked with ISI certification mark. Packages shall also be marked with name and quality of the material, nominal thickness and cut size, name of the manufacturer, as per clause 6.0 of IS;2835.

23.3.0 Plate glass :

Plate glass shall be polished patent flat glass of best quality. It shall have boththe surfaces ground flat and parallel and polished to obtain clear undisturbed vision and reflection. The plate glass shall be of thickness mentioned in the item or as shown in detailed drawings or as specified. In absence of any specified thickness, the thickenss of plate glass to be supplied shall be 6 mm and a tolerance fo 0.2 mm shall be admissible.

23.4.0 Putty :

The material shall be a homogenous paste and shall be free from dust, grit and other visible impurities and shall conform tot he specifications prescribed in IS;419.

Putty may be prepared by mixing one part of white lead with three parts of finely powdered chalk or then adding boiled linseed oil to the mixture to form a stiff paste and adding varnish to the paste at the rate of 1 litre to varnish to 18 kg of paste.

24.0.0 AC SHEET & ACCESSORIES


24.1.1 The asbestos cement sheets used for roofing and cladding shall be plain, corrugated or semi-corrugated sheets from Everest or approved make conforming to IS:459.

24.1.2 It shall be manufactured by reinforcing Asbestos to cement in such a manner that every fibre is coated with fine particles of cement to ensure maximum strength. It shall be alkali reisstant and anti-corrosive. It should not break during transportation, handling, laying and shall be non-inflammable non-organic. It shall be resistant having high tensile strength and high slendeness ratio.

24.1.3 The minimum nominal thickness of sheets shall be 6 mm, having covering efficiency of about 90% and weight 1.518kg/sqm. The permissible bending stress s shall be 130 kg/sqm.

24.1.4 The accessories shall be same thickness that of AC sheets. They shall be suitable for the type of sheet and location. They shall be from approved manufacture and free from any defect.

24.1.5 All fixing accessories shall conform to IS:730 and IS:1626. The diameter of the bolts shall not be less than 8mm. The J-bolts shall be atleast 90mm longer at lap points of sheets and 75mm longer at other points than the depth required to hook the bolt to the purlin. The galvanised iron washers shall be 25mm in diameter and 1.6mm thick. The bitumen washer shall be 35mm in diameter and 1.5 mm thick.

24.1.6 Bridges shall be of type specified in the schedule such as “one piece plain angular”, “plain wing adjustable”, “Serrated adjustable”,. “Close fitting adjustable” or “Northlight two pieces” adjustable and appropriate for the corrugated sheets used. “Plain wing angular” type of ridges can be used only if the slope of the roof is between 26 and 30 degrees. Ridges, hip section and other accessories shall be of the same manufacture as that of sheets used for the roof unless otherwise permitted by the Client/Consultant.

24.1.7 The sheets shall have rectangular shape, corrugations true and regular, edges straight and clean, smooth surface on exposed side and free from cracks and visible defects, holes, deformation, chipped edges or otherwise damage.

24.1.8 All the AC sheets shall be painted with 3 coats of lime wash on the underside unless otherwise specified.

24.1.9 Water absorption shall not exceed 28 percent of dry weight.

24.2.0 Testing :

Testing of asbestos cement products shall be done in accordance with the methods prescribed in IS:5913.

24.3.0 Storage :

Storage of AC sheets and accessories shall in general conform to IS:4082.

The materials shall be handled and stored in the manner as not to damage the same. AC sheets shall be stacked on a firm and levelled ground, laid on wooden battens according to the approved stacking methods and/or instructions of the manufacturer. They shall be protected from damage and when they are to be stacked for a longer period, they shall be stored under cover.

25.0.0 GALVANISED IRON SHEET

Galvanised iron sheets shall be from TATA or equivalent as approved by Engineer-in-charge.


25.1.1 G.I. Sheets used for roofing and cladding shall generally conform to the requirements prescribed in IS:277 and shall be of the best quality duly approved by the Client/Consultant.

25.1.2 : The base metal for galvanised sheets and coils shall be hot or cold rolled mild steel conforming to IS:513. The sheets shall be free from cracks, spilt edges, twist, surface flaws, etc.. They shall be clean, bright and smooth. The galvanizing shall be uninjured and in perfect condition. The sheets shall show no signs of rust or white powdery deposits on the surface. The corrugation shall be uniform in depth and pitch and parallel to the sides.

25.1.3 Minimum thickness of GI sheets to be used for roofing shall be 0.63 mm thick (24gauge) unless noted otherwise in the drawings or in the schedule of items.

25.1.4 Unless otherwise mentioned in the schedule, the necessary accessories like flashing, ridging, capping, gable end corner piece, barge boards etc. shall be made out of 20 gauge (1mm minimum) galvanized sheets.

25.1.5 All fixing accessories shall conform to the requirements specified in IS:730.

26.2.0 Testing :

26.2.1 Testing shall be done in accordance witht he provisions prescribed in IS:277.

26.3.0 Storage

26..3.1 Storage of GI sheets and accessories shall in general conform to IS:4082.

27.0.0 COLOUR COATED METTALIC SHEET AND ACCESSORIES

27.1.0 General requirements

27.1.1 Colour coated sheets shall be made out of cold or hot rolled MS sheets conforming to IS:513 galvanised as per IS:277 and shall be of the best quality.

27.1.2 Colour coating requirements shall be in accordance with relevant indian or foreign standards ensuring a perfect and integral chemical bond between the base metal and the polymer coat.

27.1.3 The sheets shall be free from cracks, twist, surface flaws, spilt edges and any other defects which could impair the strength and quality of the material.

27.1.4 The profile of the sheets shall be uniform, smooth, regular and true to shape.

27.1.5 The colour shades shall be consistent and free from visible defects.

27.1.6 Unless mentioned otherwise all necessary accessories shall be duly approved by the Client/Consultant.

27.2.0 Sampling :

10.2.1 Representative samples of the product shall be kept in the office of the cilent for periodic checks by Client/Consultant on compliance of quality of material actually used for the work.

27.3.0 Storage :

27.3.1 Storage of colour coated sheets and accessories shall in general conform to IS:4082 and as per manufacturer’s specifications.

28..0FALSE CEILING :


28.1.1 The cieling baords shall conform to the requirements specified in the schedule of items or in the drawings. They shall be strong and with uniform texture without cracks, holes or any other defects.

28.1.2 Galvanised steel grid system :

Main runner-Hot dipped galvanised steel, T shaped of 24x38mm size and thickenss 0.33mm cross runner - Hot diipped galvanised steel, T shaped of 24x30mm size, thickness 0.25mm. 1200 mm long and 24x25mm size, thickness 0.25mm, 600 mm long. Perimeter section shall be same material as runners. Sections shall be 22x22mm size with thickness of 0.45 mm. Exposed areas of all metallic members shall be powder coated to a thickness of 25 micron.

28.1.3 Gypsum Board Tiles with Seamless Joints :

The above shall be of the best quality from India Gypsum or equivalent as approve by the architect. It shall be formed by enclosing and bonding together a core of set gypsum plaster by two sheets of heavy paper. It shall offer high standard of safety, thermal efficiency and aesthetics. It shall be height weight, offer good fire resistance. It shall be a non-resonant material, rendering sound insulation. It shall be strong, durable and dimensionally stable. It shall offer a smooth surface which can be painted, tiled or wall-papered. It shall block this

passage of heat and shall retard the spread of fire. It shall reduce upto 60 db of sound.

Gypsum boards shall conform to IS:2095-1982 & IS:2542-1981.

It shall be resistant to delamination due ot moisture and cyclic changes in weather and humidity.

The density shall be 288 kg/cum and the weight shall vary from 8-12.8kg/sqm depending on the thickness. It shall be available in thickness of 9.5, 12.5 and 15mm.

Standard sizes are 610x610mm, 1220x1220mm and 1220x610mm.

28.1.4 Steel false ceiling :

28.1.5 Panels shall be of cold rolled steel, galvanised as per IS:277 coil coated as per IS 3312. Panels shall be 150 wide and 17mm deep. They shall be roll-formed out of 0.55 mm TCT coil coated glavanised steel. They shall be degreased, pretreated and coil coated on one side in manufacturer’s standard shades. The rear of the panels shall be given a coat of primer and a wash coat, while the finished side will be given a coat of primer and a finish colour coat in polyester paint for a minimum dry film thickness of 20 microns. Panels shall be factory cut to lengths upto 5m to suit site dimensions.

28.1.6 Panel Stringers shall be 34.5 mm wide and 48 mm deep with cutouts to hold panels in a module of 150mm. They shall be roll-formed out of 0.6mm thick galvanised steel strip cut to a standard length of 5m. Stringers shall be stove enameled black.

28.1.7 Stringers shall be suspended from the roof/truss by galvanised steel wire rod hangers and suspension clips. Hangers shall be fixed to roof by J hooks and nylon inserts or using 18g annealed GI wire.

28.1.8 Edge profiles shall be L shaped, roll formed out of 0.65mm aluminium strip/0.6 mm galvanised steel strip with pwder coating in standard colours.

28.2.0 Testing :

28.2.1 Tests shall be carried out in accordance witht he provisions of relevant standards and as directed by the client/consultant.

29.0.0 Miscellaneous materials :

29.1.0 Performed filler baord for joints :

29.1.1 Perromed filler baord shall be “SHALITEK” or equivalent conforming to IS:1838 and should consist of a fibre baord impregnated with bitumenous materials to render it durable and waterproof. It should be compressible and possess a high degree of resilience. It shall withstand dampen minor vibrations.

29.1.2 The filler should permit free movement of the concrete members in expansion and contraction and should provide waterproof seal and resist entry of any forreign material. The filler should be resilient and non-extrudible.

29.2.0 Polysulphide sealant :

29.2.1 Polysulphide sealants shall be of approved make and shall comply with all the requirements prescribed in IS:12118.

29.2.2 It shall be a two-component polysulphide rubber joint sealant based on low molecular weight polymer. It should not contain chlorides or other corrosive substances.

29.2.3 The modulus of elasticity of the sealant shall not be less than 0.16 Mpa+/-10% at 100% ekibgatuib, tge sgire “A’ hardness shall be 22+/-3@25°C. The operating temperature range shall be -25°C to 80°C. The permanent dynamic movement capability shall be +/-25%. The tensile strength shall not be less than 0.4Mpa.

29.2.4 It shall posses properties like 550% elongation at break, non-toxicity when fully cured, no staining, shrinkage less than 1%. The trafficable strength shall be achieved within 24 hrs and full at 7 days (at 25°C & 250% RH).

30.0.0 BITUMEN WORKS

30.1 SEMI DENSE BITUMINOUS CONCRETE

30.1.1 Scope

This work shall consist of constructing in a single layer,semi dense bituminous concrete (asphaltic concrete) of thickness 25 mm on previously prepared bituminous course .

30.1.2. Materials

Bitumen : 60/70 grade

Coarse aggregates : Stone Polishing Value as measured by BS : 812 (Part 114) shall not be less tha 55. The aggregates shall satisfyl the physical requirements as given in these specification except that the maximum value for the water absorption should be 1 per cent.

Fine aggregates : Filler : Coarse sand.Aggregates gradation : The mineral aggregates, including mineral filler shall be so graded or combined as to conform to the grading set forth in Table given below.TABLE- AGGREGATES GRADATION FOR BITUMINOUS CONCRETE

IS Sieve Designation Per cent passing the sieve by weight

26.5 mm 10019 mm 90-1009.5 mm 56-804.75 mm 35-652.36 mm 23-49300 micron 5-1975 micron 2-8

30.1.3 Mix Design

Requirement of mix : Apart from conformity with the grading and quality requirements of individual ingredients, the mix shall meet the requirements set forth in following Table-

TABLE- REQUIREMENTS OF BITUMINOUS CONCRETE MIX

S.NO. DESCRIPTION REQUIREMENTS

1. Marshall stability (ASTM Designation : 820 kg (1800 ib)D-1559) determined on Marshall speciments MinimumCompacted by 75 compaction blows on each end

2. Marshall flow (mm) 2-4

3. Per cnet air voids in mix3-4

4. Per cent voids in mineral aggregates (VMA Minimum11-13 per cent

5. Per cent voids in mineral aggregates Filled by bitumen (VFB) 65-75

6. Binder content, per cent by weight of total mix minimum 4.5

7. Water Sensitivity (ASTM D1075) loss of stability Min. 75 per centOn immersion in water at 6060c retained strength

8. Swell Test (Asphalt Instt. MS-2, No. 2) 1.5 per cent Max.

Binder content : The binder content shall be so fixed as to achieve the requirements of the mix set forth in above Table . Marshall method for arriving at the binder content shall be adopted.

Permissible variations from the job mix : The Contractor shall have the responsibility of ensuring proportioning of materials in accordance with the approved job mix and producing a uniform mix. The permissible variations of individual percentages of various ingredients in the actual mix from the job mix a may be within the limits as specified in Tabel below. These variations are intended to apply to individual specimens taken for quality control tests vide Section 900.

TABLE- PERMISSIBLE VARIATION FROM JOB MIX

S.NO. DESCRIPTION PERMISSIBLE VARIATION

BY WT OF TOTAL MIX IN %

1. Aggregate passing 13.2 mm sieve and larger sieves: + /- 8

2. Aggregate passing 11.2 mm sieve and 5.6 mm sieves: + /- 7

3. Aggregate passing 2.8 mm sieve and 1.4 mm sieves: +/ - 6

4. Aggregate passing 710 microns sieve and 335 microns sieve +/ - 5

5. Aggregate passing 180 microns sieve +/ - 4

6. Aggregate passing 90 microns sieve +/ - 3

7. Bitumen +/- 0.3

8. Mixing tempreture+/- 10 degree Centigrade

Construction Operations

Weather and seasonal limitation : Job shall not be carried out in rainy season or when base course is damped and wet.Preparation of base : The base on which bituminous concrete is to be laid shall be prepared, shaped and conditioned to the specified levels, grade and crossfall (camber) as directed by the Engineer in charge.

The surface shall be thoroughly swept clean free from dust and foreign matter using mechanical broom and dust removed by mechanical means or blown off by compressed air. In portions where mechanical menas connot reach, other approved method shall be used.

Tack coat : A tack coat shall be applied at the rate of 9.8 kg per 10 square meter of area.

Preparation of mix : The mix shall be prepared in hotmix plant only .

Spreading : The mix should be evenly spreaded and temprature shall not be less than 121 degrees. Mechanical paver equipment shall be used if directed by EIC.

Rolling : After being spread, consolidation shall be carried out by using 10 MT power roller.

Opening to Traffic: Traffic may be allowed immediately aftger completion of the final rolling when the mix has cooled down to the surrounding temperature.

Surface Finish of Work : The surface finish of construction shall conform to the instruction of EIC.

Measurements for PaymentBituminous concrete shall be measured as finished work in square metres.

RateThe rate for bituminous concrete shall be for carrying out the job in all respects including all material and labour complete.. The rate shall cover the provision of bitumen in the mix at minimum 5.0 per cent of the weight of the total mix .

31.0 SEAL COAT

Scope : The work shall consist of application of a seal coat for sealing the voids in a bituminous surface laid to the specified levels, grade and cross fall (camber).

Seal coat shall be of Premixed seal coat comprising of a thin application of fine aggregates premixed with bituminous binder. The compacted thickness shall not less than 12 mm.

31.1.0 Materials

Binder : The quantity of bitumen shall be 19.6 kg per 10 square metres area for seal coat respectively.

Aggregates for seal coat : The aggregates shall be fine stone aggregate of 6 mm and down and or grit and shall consist of clean, hard, durable, uncoated dry particles and shall be free from dust, soft or falky/elongated material, organic matter or other deleterious substances. The aggregate shall pass throgh 11.2 mm sieve 100% and reained on 2.36 mm sieve . The quantity used for premixing shall be minimum 0.09 cubic metre per 10 square metre area.

Construction Operations:

Preparation of base : The seal coat shall be applied immediately after the laying of bituminous premix course which is required to be

sealed. Before application of seal coat materials, the surface shall be cleaned freee of any dust or other extraneous matter.

Construction of seal coat : Mixer of appropriate capacity and type shall be used for preparation of mix material. The plant shall have separate dryer arrangement for heating aggregate and pugmill for mixing aggregate and binder

The binder shall be heated in boilers of suitable design, to the temperature appropriate to the grade of bitumen approved by the Engineer. Also the aggregates shall be dry and suitably heated to a temperature directed by the Engineer before the same are placed in the mixer. Mixing of binder with aggregates to the specified proportions shall be continued till the latter are thoroughly coated with the former.

The mix shall be immediately transported from the mixing plant to the point of use and spread uniformly on the bituminous surface to be sealed.

As soon as sufficient length has been covered with the premixed material, the surface shall be rolled with 10 MT smooth - wheeled roller. Rolling shall be continued till the premixed material completely seals the voids in the bituminous course and a smooth uniform surface is obtained.

Opening to Traffic

Traffic may be allowed soon after final rolling when the premixed material has cooled down to the surrounding temperature.

Materials not conforming to the Specification and requirements shall not be brought to the work site.

32.0 BITUMEN MASTIC

SCOPEThis work shall consist of constructing a single layer of 25 mm thick Bitumen Mastic wearing course for retail oulet driveways. The bitumen Mastic shall be laid over the asphalted driveway.

The Bitumen Mastic is an intimate homogenous mixture of selected well - graded aggregates and bitumen in such proportions as to yield a plastic and voidless mass, which when applied hot can be trowelled and floated to form a very dense impermeable surfacing.

Materials

Bitumen : The binder shall be straight-run bitumen of industrial grade 85/25 as conforming IS 702. The requirements of physical properties of bitumen are as given below

TABLE. REQUIREMENTS OF PHYSICAL PROPERTIES OF BITUMEN

S. No. Characteristics RequirementMethod of Tests

1. Penetration at 25o C (in 1 / 100 cm) 20 to 40IS : 1203

2. Softening point (Ring and Ball method) 50o C to 90o C IS : 1205

3. Ductility at 27o C (Minimum) 10 cmIS : 1208

4. Loss on heating (Maximum) 3 per cent IS : 1212

5. Solubility in CS2 (Minimum) 99 per cent IS : 1216

Coarse aggregates : The coarse aggregates shall consist of hard, durable crushed stones, which shall be clean, strong, free of disintegrated piece, organic and other deleterious matter and adherent coatings. They shall be hydrophobic and of low porosity and shall satisfy the physical requirements as mentioned in specification except that the maximum value of water absorption shall be 1 per cent.

The percentage and grading of the coarse aggregates to be incorporated in the bitumen mastic depending upon the thickness of the finished course shall be as in given Table.

TABLE 500-28. GRADING AND PERCENTAGE OF COARSE AGGREGATES

S.No Type of work Thickness Percentage Grading of Coarse

Of finished of Coarse AggregatesCourse (mm)aggregates

Passing Percentage

I.S. Sieve

1. Wearing course 25-40 30-40 19mm 100For pavement 13.2 mm 88-96

40-50 2.36 mm 0-5

Fine aggregates : The fine aggregates shall be the fraction passing 2.36 mm and retained on 75 micron sieve consisting of crusher run screening, natural sand or a mixture of both. These shall be clean, hard, durable, uncoated, dry and free from any injurious soft or flaky pieces and organic or deleterious substances.

Filler : The filler shall be limestone powder passing 75 micron sieve and shall have a calcium carbonate content of not less than 80 per cent by weight when determined in accordance with IS : 1195.

The grading of the fine aggregates (Inclusive of Filler)

S.No. I.S. Sieve I.S. Seive PercentagePassing Retained by weight

1 2.36 mm 600 micron 0.25

2 600 micron 212 micron 5.35

3 212 micron 75 micron 10.20

4 75 micron -- 30-505 Bitumen Binder 14-17

MIX DESIGN

Hardness number : The bitumen mastic shall have a hardness number of 60 to 80 at 250 C after adding coarse aggregates. The hardness number shall be determined in accordance with the method specified in IS : 1195.

Binder content : The binder content shall be so fixed as to achieve the requirements of the mix set iforth in above Clause and indicated in above Table.

Job mix formula : The contractor shall intimate the Engineer in charge in writing at least 20 days before the start of the work, the job mix formula proposed to be used by him for the work, indicating the source and location of all materials, proportions of all materials such as binder and aggregates single definite percentage passing each sieve for the mixed aggregates and result of the tests recommended in various Tables and Clauses of this Specifications.

Construction Operations

Weather and seasonal limitations : As mentioned above.

Preparation of the base : The base on which bitumen mastic is to be laid shall be prepared, shaped and conditioned to the specified levels, grade and crossfall (camber) ias directed by the Engineer in charge. In case of a cement concrete base, the surface shall be thoroughly swept and scraped clean and free of dust and other deleterious matter. Under no circumstances shall bitumen mastic be spread on base containing a binder which will soften under high application temperature. If any such spots or area are there, the same shall be cut out and repaired before the bitumen mastic is laid with no extra cost.

Tack coat : A tack coat shall be applied at the rate of 9.8 kg per 10 square meter of area.

Preparation of bitumen mastic : Preparation of bitumen mastic consists of two stages. The first stage shall be mixing of filler and fine aggregates and then heating the mixture to a temperature of 170oC to 200oC. Required quantity of bitumen shall be heated to 170oC to 180oC and added to the heated aggregate. They shall be mixed and cooked in an approved type of mechanically agitated mastic cooker for some time till the materials are thoroughly mixed. Initially the filler alone is to be heated in the cooker for an hour and then half the quantity of binder is added after heating and mixing for some time, the fine aggregates and the balance of binder are to be added and further cooked for about one hour. The second stage is incorporation of coarse aggregates and cooking the mixture for a total period of 3 hours.

During cooking and mixing, care shall be taken to ensure that the contents in the cooker are at no time heated to a temperature exceeding 200oC.

In case where the material is not required for immediate use it shall be cast into blocks with filler, fine aggregates and binder, weighing about 25 kg each. These blocks when required to be used, have to be reheated in the mechanically agitated cooker to a temperature of not less than 170oC and not more than 200oC, thoroughly incorporated with the requisite quantity of coarse aggregates and mixed continuously for not less than an hour. Mixing shall be continued until laying operations are completed so as to maintain the coarse aggregates in suspension. At no stage during the process of mixing shall the temperature exceed 200oC.

The bitumen mastic blocks (without coarse aggregates) shall show on analysis a compositions within the limits as given in Table below-

COMPOSITION OF BITUMEN MASTIC BLOCKS WITHOUT COARSE AGGREGATES

S.No. I.S. Sieve I.S. Seive Percentage by weightPassing Retained Minimum

Maximum

1 2.36 mm 600 micron 0 22

2 600 micron 212 micron 4 30

3 212 micron 75 micron 8 18

4 75 micron --- 25 45

5 Bitumen Binder 14 17

The mix shall be transported to the laying site in a towed mixer transporter having arrangement for stirring and keeping the mix hot during transportation.

Spreading : The bitumen mastic shall be deposited directly on the prepared base immediately in front of the spreader where it is spread uniformly by means of wooden floats of the spreader to the required thickness. The mix shall be laid in one meter width contained between angle iron of sizes suitable to retain the required thickness. The

temperature of the mix at the time of laying shall be around 170oC. In case blowing takes place while laying the bitumen mastic, the bubbles shall be punctured while it is hot and the surface treated well.

Joints: It shall be ensured that all construction joints are properly and truly made. These joints shalll be made by warning existing bitumen amstic by the application of excess quantity of the bitumen mastic mix which afterwards shall be trimmed off to make it flush with the surfaces on either side.

Surface finish : The bitmen mastic surface can be slippery after floating ; in order to provide resistance to skidding, the bitumen mastic after spreading, while still hot, and in plastic condition shall be covered with a layer of stone aggretates of 9.5 mm size (passing 13.2 mm sieve and retained on 6.7 mm sieve). Hard stone chips of approved quality precoatedd with bitumen at the rate the of two per cent of S-65 to S-90 penetration grades at 25 c at the rate of 0.005 cu.m. Per 10 sq.m. Shall be rolled or otherwise pressed into the surface of the mastic layer when the temperature of bitumen mastic is between 80 c and 100 c.

Opening to Traffic :The traffic may be allowed after completion of the work when the bitmen mastic has cooled down to the surrounding temperature.

Quality control of workThe type and grade of bitumen ; the quality grade and percentage of coarse and fine aggregates and filler; the temperature control for heating the materials/mix, laying, floating and compacting, hardness Number of the bitumen mastic, etc., should be strictly followed as indicated in the various clauses of this Specification or as directed by the Engineer in charge.

The quality control tests for coarse and fine aggregates shall be exercised by the Engineer in charge. For mineral filler, one test for each property for every 5 tonnes, subject to a minimum of one test for each consignment shall be carried out,The surface of the bitumen mastic tested with a straight edge 3.0 m long, placed paralled to the centre line of the carriasgeway shall have no depression greater then 4 mm. The same limit shall also apply in case of transverse profile when tested with a camber template.

Measurements for Payment

Bitumen mastic shall be measured as finished work in square metres .

33. DENSE BITUMINOUS MACADAM

ScopeThis work shall consist of construction in a single course of 75 mm thick base/binder course to the following Specifications on a previously prepared base.

Materials

Bitumen : The bitumen shall be paving bitumen of Penetration Grade S 65 or A 65 (60/70) as per Indian Standard Specifications for “Paving Bitumen” IS : 73. In case of non - availability of bitumen of this grade, S 90 (80/100) grade bitumen may be used with the approval of the Engineer in charge.

Coarse aggregates : The coarse aggregates shall consist of crushed stone, crushed gravel / shingle or other stones. They shall be clean, strong, durable of fairly cubical shalpe and free from disintegrated pieces, organic or other deleterious matter and adherent coating. The aggregates shall preferably be hydrophobic and of low porosity. If hydrophilic aggregates are to be used, the bitumen shall be treated with antistripping agents of approved quality in suitable doses. The aggregates shall satisfy the physical requirements set forth in Table given below-

If crushed gravel / shingle is used, not less than 90 per cent by weight of the gravel / shingle pieces retained on 4.75 mm sieve shall have at least two fractured faces. The portion of the total aggregate passing 4.75 mm sieve shall have a sand equivalent value of not less than 50 when tested in accordance with the requirement of IS : 2720 (Part - 37).

The plasticity index of the fraction passing the 425 micron sieve shall not exceed 4.

PHYSICAL REQUIREMENTS OF AGGREGATES FOR DENSE BITUMINOUS MACADAM

S.No. Test Test MethodRequirement

1 Los Angeles Abrasion Value* IS : 2386 (Part-4) 40 percent

maximum

2 Aggregate Impact value * IS : 2386 (Part-4) 30 percent

maximum

3 Flakiness and Eleongation ** IS : 2386 (Part-1) 30 percent Indices (Total)

maximum

4 Coating and Stripping of Bitumen AASHTO T 182 Minimum retained Aggregate Mixtures coating 95 per cent

5 Soundness IS : 2386 (Part-5)(i) Loss with sodium 5 cycles 12

percent Sulphatemaximum

(ii) Loss with Magnesium 5 cycles 18

percent Sulphatemaximum

6 Water absorption IS : 2386 (Part-3) 2 percent

maximum

* Aggregates may satisfy requirements of either of the two tests.** To determine this combined proportion the flaky stone from a representative sample should first be separated out. Flakiness index is weight of flaky stone metal divided by weight of stone sample. Only the elongated particles be separated out form the remaining (non-flaky) stone metal. Elongation index is weight of elongated particles divided by total non-flaky particles. The value of flakiness index and elongation index and elongation index so found are added up.

Fine aggregates : Fine aggregates shall be the fraction passing 2.36 mm sieve and retained on 75 micron sieve, consisting of crusher-run screening, gravel, sand or a mixture of both. Theses shall be clean hard, durable, uncoated, dry and free from any injurious, soft or flaky pieces and organic or other deleterious substances.

Filler : Filler shall consist of finely divided mineral matter such as rock dust, hydrated lime or cement as directedby the Engineer in charge .

The filler shall be graded within the following limits :

IS Sieve Percent passing by weight

600 micron 100300 micron 95-

10075 micron 85-

100

The filler shall be free from organic impurities and have a plasticity index not grater than 4. The plasticity index requirement shall not apply if filler is cement of lime. When the coarse aggregate is grave, 2 percent by mass of total aggregate of Portland cement or hydrated lime shall be added and the percentage of fine aggregate reduced accordingly. Cement or hydrated lime is not required when the gravel is limestone.

Aggregate gradation : The combined coarse and fine aggregates and filler (when used) shall produce a mixture to confirm the grading set for in Table given below -

AGGREGATE GRADATION FOR DENSE BITUMINOUS MACADAM

Sieve Designation Percentage passing the sieve by weight

37.5 mm 10026.5 mm 95-10013.2 mm 56-804.75 mm 29-592.36 mm 19-45300 micron 5-1775 micron 1-7

The aggregate mix, as used in work, shall not vary from the low limit on one sieve to the limit on the adjacent sieve bug shall be well graded.

Mix Design

Requirement of mix : Apart from conformity with grading and quality requirement of individual ingredients, the mix shall meet the requirements set out in given Table -

REQUIREMENTS OF DENSE BITUMINOUS MACADAM MIX

S.No. DescriptionRequirements

1 Marshall stability (ASTM Designation - D - 1559) 820 kg (1800 lb)

Determined on Marshall specimens compactedminimumBy 75 compaction blows on each end

2 Marshall flow (mm) 2 - 4

3 Per vent Air voids 3 -5

4 Minimum voids in mineral aggregates (VMA) 10 percent - 12 per cent

5 Per cent voids in mineral aggregates filled by Bitumen (VFB) 65 - 75

6 Binder content per cent by weight of total mix Not less than 4.0 per cent

Binder Content : The binder content shall be so fixed as to achieve the requirements of the mix set out in above Table . Marshall method for arriving at the binder content shall be adopted, replacing the aggregates retained on 26.5 mm sieve by the aggregates passing 26.5 mm sieve and retained 22.4 mm sieve.

APPLICABLE CODES AND SPECIFICATIONS;

The following specifications, standards and codes are made a part of this specifications. All standards, tentative specifications, specifications, codes of practice referred to herein shall be the latest editions including all applicable official amendments and revisions.

In case of discrepancy between this specification and those referred to herein, this specificaiton shall govern.

APPLICABLE IS SPECIFICATIONS AND CODES OF PRACTICE:

IS 269:- Specification for ordinary, rapid hardening and low heat portland cement.

IS 8112:- Specification for high strength ordinary, portland cement.

IS 1489 - Specification for portland - pozzolona cement.

IS 383:- Specification for coarse and find aggregates from natural source for concrete.

IS 2386:- Methods of test for aggregates for concrete. (Part I to VIII)

IS 516:- Method of test for strength of concrete.

IS 1199:- Method of sampling and analysis of concrete.

IS 3025:- Methods of sampling and test (Physical and chemical) water used in industry.

IS 432:- Specification for mild steel and medium tensile steel (parts I & II) bars and hard drawn steel wire for concrete reinforcement.

IS 1139:- Specification for hot rolled mild steel and medium tensile steel deformed bars for concrete reinforcement.

IS 1566:- Specification for plain hard drawn steel wire fabric (Part I) for concrete reinforcement.

IS 1786:- Specification for cold twisted steel bars for concrete reinforcement.

IS 2645:- Specification for integral cement waterproofing compound.

IS 456:- Code of practice for plain and reinforced concrete.

IS 3370:- Code of practice for concrete structures for storage of liquids (Part I to IV)

IS 2502:- Code of practice for bending and fixing of bars for concrete reinforcement.

IS 2571:- Code of practice for laying in situ cement concrete flooring.

IS 3596:- Safety code for scaffolds and ladders. (Part I & II)

IS 1200:- Method of measurement of building works.

CPWD Specification volume I & II

MOST specification

TESTING OF MATERIALS

The contractor shall carryout the following tests at his own expense and as directed by the Engg.-in-charge. Also Engineer-In-Charge reserves their right to ask the contractor to carry out any further tests on any material which is being used in the project.

1. WATER: Suitability for construction/ concreting purposes as per IS 456-2000

Periodicity: One test at the beginning of the project and once in every 3 months as per IS code

2. SANDTests to be conducteda. Particle size - Labb. Silt content - Fieldc. Bulking of sand-Field d. Percentage of Deleterious material / Organic impurities - labIs code for material - IS-383-1970IS code for testing - IS-2386 (Part I) to IS-2386 (Part VIII)

Periodicity of testingWhenever there is a change in source of supply or as directed by the Engineer-in-Charge.Remarks1. Silt content should not exceed 8%.2. For sand pad foundation no need of particle size distribution. Only

silt & bulk content to be carried out.

Sand (for plastering)Tests to be conducteda) Particle size - Labb) Silt content - Fieldc) Percentage of Deleterious /organic impurities - Lab.IS code for material - IS-1542IS code for testing - IS-1727Periodicity of testingSame as above, Test shall be repeated for Minimum qty. 500 sq. m of plastering.Remarks1. Silt content not to exceed 5%2. Sand to be sieved in sieve size 4.75 mm

3. COARSE AGGREGATETests to be conducteda. Percentage of Soft deleterious materials- Field (Visual)b. Particle size distributionc. Aggregate value :

1. Crushing - Lab2. Impact - Lab3. Abrasion - Lab (Only for Roads)IS code for material - IS-383-1970IS code for testing - IS-2386 (Part I) to IS 2386 (Part VIII)

Periodicity of TestingMinimum 45 cum. Tests to be repeated for every 45 cum of coarse aggregate or part thereof.RemarksPercentage of soft deleterious materials. Usually visual inspection shall be carried out. If Engg.-in-Charge / Architects has doubts, the same may be tested in Lab.

4. CEMENTTests to be conducteda. fineness - Labb. Soundness - Labc. Setting Time - Labd. Compressive strength - Lab

Periodicity of TestingMinimum qty. 20 MT, Tests to be repeated for every 50 MT or part thereof or change of supplier.RemarksCement to be tested if supplied by the contractor. Cement to be tested if stored for more than 3 months.

5. CEMENT CONCRETETests to be conducteda. Slump test - Fieldb. Cube strength - Lab/field

Periodicity of Testinga. Once for minimum 5 cum.b. Minimum 15 cum of part thereof.

RemarksCube strength to be taken for both 7 days as well as 28 days. Cubes of critical members (decided by Engg.-in-Charge) shall be tested at lab.

6. REINFORCEMENT STEELTests to be conducteda. Free from defects - Field (Visual)b. Weight - Labc. Size - Labd. Ultimate tensile stress - Labe. Yield stress - Labf. Elongation percentage - Labg. Bend Re-bend test - LabIS code for material IS-432 for mild steel IS-1786 for Tor steelIS code for testing - IS-1608

Periodicity of TestingMinimum qty. 10 MT, tests shall be repeated for every 10 MT of each size (dia) or part thereof.Remarksa. Steel shall be tested if supplied by contractor.b. Steel shall be tested if stored in open yard for more than one year. NOTE : All the testing equipments/ machines like Sieve, Compression testing machine etc. required for field tests shall be arranged by the party at site. In case of failure of machine, testing to be carried out by the Contractor at lab at no extra cost

7. BRICKSTests to be conducteda. Compressive Test - Lab b. Water absorption - Labc. Efflorescence - Labd. Percentage of Deleterious material - Lab.e. Dimension test-Lab

IS code for material - IS-1077-1986IS code for Testing - IS-3495 (Part I) to IS-3495 (Part III)

Periodicity of TestingMinimum 20000 bricks but tests shall be repeated for every 40000 or part thereof depending on the volume of work.

8.0 TILESTests to be conductedTolerance in size (+/- 1 mm on length & breadth)Thickness of wearing layer – LabWater absorption – LabTransverse Strength – LabAbrasion Strength - LabIS Code for testing as per standardPeriodicty of testing2 sample tiles to be tested for minimum quantity of 80 Sqm

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TECHNICAL SPECIFICATION - HPCLtenders.hpcl.co.in/tenders/tender_prog/TenderFiles/846... · Web viewThe projection of skirting from the finished wall surface shall not be more than