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TENDER NO. TENDER NO. TENDER NO. TENDER NO. 09090909/PP/CC ROAD/2011/PP/CC ROAD/2011/PP/CC ROAD/2011/PP/CC ROAD/2011
Construction of Construction of Construction of Construction of Reinforced Cement Concrete road in SiloReinforced Cement Concrete road in SiloReinforced Cement Concrete road in SiloReinforced Cement Concrete road in Silo
area at 2x125 mw Akrimota Power Project , area at 2x125 mw Akrimota Power Project , area at 2x125 mw Akrimota Power Project , area at 2x125 mw Akrimota Power Project ,
Village Nani Chher .Village Nani Chher .Village Nani Chher .Village Nani Chher .
Tal: Lakhpat , Dist: Kutchh Tal: Lakhpat , Dist: Kutchh Tal: Lakhpat , Dist: Kutchh Tal: Lakhpat , Dist: Kutchh
TECHNICAL BID TECHNICAL BID TECHNICAL BID TECHNICAL BID
PARTPARTPARTPART---- I I I I
GUJARAT MINERAL DEVELOPMENT CORPORATION LIMITEDGUJARAT MINERAL DEVELOPMENT CORPORATION LIMITEDGUJARAT MINERAL DEVELOPMENT CORPORATION LIMITEDGUJARAT MINERAL DEVELOPMENT CORPORATION LIMITED
(A Govt. of Gujarat Enterprise)(A Govt. of Gujarat Enterprise)(A Govt. of Gujarat Enterprise)(A Govt. of Gujarat Enterprise)
Khanij Bhavan, Near University Ground, 132Khanij Bhavan, Near University Ground, 132Khanij Bhavan, Near University Ground, 132Khanij Bhavan, Near University Ground, 132 feet Ring Road, feet Ring Road, feet Ring Road, feet Ring Road,
Vastrapur, AhmedabadVastrapur, AhmedabadVastrapur, AhmedabadVastrapur, Ahmedabad----380 052380 052380 052380 052
Phone : (079) 27913200, 27913501 Fax No : (079) 27911454Phone : (079) 27913200, 27913501 Fax No : (079) 27911454Phone : (079) 27913200, 27913501 Fax No : (079) 27911454Phone : (079) 27913200, 27913501 Fax No : (079) 27911454
Website Website Website Website www.gmdcltd.comwww.gmdcltd.comwww.gmdcltd.comwww.gmdcltd.com
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INDEXINDEXINDEXINDEX
Name of Work: Name of Work: Name of Work: Name of Work: Construction of Construction of Construction of Construction of Reinforced Cement Concr Reinforced Cement Concr Reinforced Cement Concr Reinforced Cement Concrete Road in Silo ete Road in Silo ete Road in Silo ete Road in Silo
area at 2x125 MW Akrimota Power project , Village Nani Chher , Tal: Lakhpat, area at 2x125 MW Akrimota Power project , Village Nani Chher , Tal: Lakhpat, area at 2x125 MW Akrimota Power project , Village Nani Chher , Tal: Lakhpat, area at 2x125 MW Akrimota Power project , Village Nani Chher , Tal: Lakhpat,
Dist: Kutchh Dist: Kutchh Dist: Kutchh Dist: Kutchh . . . .
S.NS.NS.NS.N
....
ChapterChapterChapterChapter Title & DescriptionTitle & DescriptionTitle & DescriptionTitle & Description Page Nos.Page Nos.Page Nos.Page Nos.
Technical Bid.Technical Bid.Technical Bid.Technical Bid.
1. 1. 1. 1. ---- Tender NoticeTender NoticeTender NoticeTender Notice 3333----5555
2222 Introduction Introduction Introduction Introduction 6666----7777
3333 IIII Instruction to The Bidders Instruction to The Bidders Instruction to The Bidders Instruction to The Bidders 8888----9999
4444 IIIIIIII Instruction to Bidders for Online TenderingInstruction to Bidders for Online TenderingInstruction to Bidders for Online TenderingInstruction to Bidders for Online Tendering
10101010----11112222
5555 IIIIIIIIIIII
Check List Of Documents Enclosed With Check List Of Documents Enclosed With Check List Of Documents Enclosed With Check List Of Documents Enclosed With
TenderTenderTenderTender
13131313
6666 IVIVIVIV Criteria for Evaluation of Technical BidsCriteria for Evaluation of Technical BidsCriteria for Evaluation of Technical BidsCriteria for Evaluation of Technical Bids (Form (Form (Form (Form
A & B ) A & B ) A & B ) A & B )
14 14 14 14 ----11117777
7777 VVVV General Instructions to the BiddersGeneral Instructions to the BiddersGeneral Instructions to the BiddersGeneral Instructions to the Bidders
11118888----22220000
8888 VIVIVIVI General TeGeneral TeGeneral TeGeneral Terms & Conditions rms & Conditions rms & Conditions rms & Conditions 22221111----25252525
9999 EMD details on renderer letterhead EMD details on renderer letterhead EMD details on renderer letterhead EMD details on renderer letterhead 26262626
10101010 Prescribed Forms for undertakings/ Prescribed Forms for undertakings/ Prescribed Forms for undertakings/ Prescribed Forms for undertakings/
declaration by bidderdeclaration by bidderdeclaration by bidderdeclaration by bidder
27272727----29292929
12121212 Format for No Deviation sheet Format for No Deviation sheet Format for No Deviation sheet Format for No Deviation sheet
30303030
13 13 13 13 Technical BidTechnical BidTechnical BidTechnical Bid---- Part II Part II Part II Part II
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e-TENDER NOTICE
GMDC , invites Online e-Tender from reputed contractors for , , , , Construction of Construction of Construction of Construction of
Reinforced Cement Concrete Road in Silo area at 2x125 MW Akrimota Power Reinforced Cement Concrete Road in Silo area at 2x125 MW Akrimota Power Reinforced Cement Concrete Road in Silo area at 2x125 MW Akrimota Power Reinforced Cement Concrete Road in Silo area at 2x125 MW Akrimota Power
project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh .
1 e-Tender No 09/PP/CC ROAD/2011
02
Name Of Work / Job Construction of Reinforced Cement Construction of Reinforced Cement Construction of Reinforced Cement Construction of Reinforced Cement
Concrete Road in Silo area .Concrete Road in Silo area .Concrete Road in Silo area .Concrete Road in Silo area .
03 Location At 2x125 MW Akrimota Power project ,
Village Nani Chher , Tal: Lakhpat, Dist:
Kutchh .
04 Tender Fee [Non refundable]
Rs. 1,500/-D.D.
DD should be of nationalized Bank or HDFC/IDBI/ICICI/AXIS Bank only in
favour of ’GMDC Ltd’ , payable at Ahmedabad
05 Availability of tender On web site https://gmdc.nprocure.com
06 Total Estimated Cost Rs. 29,05,300/-
07 Earnest Money deposit Rs. 29,100/- By D.D. of Nationalised or
HDFC/IDBI/ICICI/AXIS Bank only in favour of ’GMDC Ltd’ , payable at
Ahmedabad and to be enclosed along with technical bid only , failing which
tender will not be considered as a valid tender
08 Security Deposit 5 % of contract value (including EMD) in
form of DD of nationalized bank or HDFC/IDBI/ICICI/AXIS Bank only in
favour of ’GMDC Ltd’ , payable at
Ahmedabad , to be submitted on issue of
LOI .
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09 Retention Money Retention money deposit will be deducted from RA bills @ 5 % of the
value of the contract amount, which will be released after one month from
completion of the work .
10 Work Completion Time. Four months
11 Last Date and time for Downloading of Tender
document
On or before 26-7-2011 up to 18.00 hrs
12 Last date and time for On line submission of tender
DT: 26-7-2011 up to 18.00 hrs
13 Last date for Submission of Tender fee , EMD and
Supporting doc. for Tech. bid during office hours in
person
Dt: 27-7-2011 up to 18.00 hrs.
14 Date and time for opening of Technical bid
Dt: 28-7-2011 at 15.00 Hrs
15 Validity of tender 180 Days
1. The Gujarat Mineral Development Corporation reserves the right to reject
any or all the tenders or split the work between more than one bidders without assigning any reason thereof.
2. The bidders are required to quote the rate strictly as per the terms and
conditions mentioned in the Tender document. The conditional tender will not be entertained and shall be liable for outright rejection.
3. bidder registered either in DGS & D , SSI , NSIC or in the Central/ State Govt. or Central / State Govt. undertaking is not exempted by this
corporation for paying EMD , SD etc. As well as no price preferences over the quoted rate will be considered .
4. Bidders are requested to visit the site before quoting the tender .
5. Tender will be considered only of those parties having Provident Fund
Number received from Regional Provident Fund Commissioner’s office and permanent Account Number of Income Tax , service tax no. and
qualified as per Pre qualification criteria/bid.
6. Tender documents are only available in Electronic form. The bidder should submit all the forms electronically only.
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7. Bidders who wish to participate in this tender will have to register on https://gmdc.nprocure.com . Further bidders who wish to participate in
online tenders will have to procure Digital Certificate as per information technology Act 2000 using which they can sign their electronic bids.
Bidder can procure the same from (n) code solution- a division of GNFC Ltd, who are licensed Certifying Authority by Govt. of India and they will
assist them in procuring the same at below mentioned address. Bidders who already have a valid Digital certificate need not procure a new
Digital Certificate.
(n) Code Solution A division of GNFC 301, GNFC Infotower, Bodakdev, Sarkhej- Gandhinagar highway, Ahmedabad- 380 054
Tel: +91 26857316/17/18 Toll Free- 1-800-233-1-1 Ext: 501, 512, 516, 517
Fax: =91 79 26857321 E-mail: [email protected] Mobile: 9327084190 , 98985889652
Manager (Civil)
GUJARAT MINERAL DEVELOPMENT CORPORATION LTD. (A Govt. of Gujarat Enterprise)
KHANIJ BHAVAN, 132’ RING ROAD, UNIVERSITY GROUND
VASTRAPUR, AHMEDABAD 380 052 � EPABX : 27913200 EXTN. 1712, 1714 , 1726 & 1725
� TELE-FAX: (079) 2791 154O
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INTRODUCTION
TENDER NO. 09/PP/CC ROAD/2011
The owner, M/s. Gujarat Mineral Development Corporation Limited, Ahmedabad (hereinafter referred to as Employer or Owner) invites e- tenders
from experienced and financially sound contractor , who are in the field of civil
construction work , in two bid system part I & II technical Bid/ PQ bid and Part II Price Bid, at Khanij Bhavan, 132 Ft Ring Road, Nr. University Ground,
Vastrapur, Ahmedabad 380 052.
Name of Work : Construction of Construction of Construction of Construction of Reinforced cement concrete road at silo area Reinforced cement concrete road at silo area Reinforced cement concrete road at silo area Reinforced cement concrete road at silo area
at Akri mota Power at Akri mota Power at Akri mota Power at Akri mota Power Project , village Nani Chher , Tal: Lakhpat, Dist : Kutchh . Project , village Nani Chher , Tal: Lakhpat, Dist : Kutchh . Project , village Nani Chher , Tal: Lakhpat, Dist : Kutchh . Project , village Nani Chher , Tal: Lakhpat, Dist : Kutchh .
The estimated cost of proposed work is approximately Rs. 29,05,300/-
including cost of all materials like cement ,steel , man power, tools , tackles machineries, equipment ,safety measures, mobilization etc to complete the
work in all respect.
In view of the above and to get resourceful and experienced agencies (Contractors or Bidders), it will be necessary to get them pre-qualified for the
work under reference on the basis of the documents submitted by the contractors as asked by GMDC (Corporation).
With a view to select a competent agency for the subject work under reference
the Tender Documents are placed on (n) procure management system. The Tender Documents include Technical Bid / Prequalification Bid. Only the
tenders of the tenderers who are qualified in the Technical Bid / Prequalification Bid will be considered for further evaluation. The tenderers
(bidders) are requested to send all the required documents as mentioned in the Technical Bid / Prequalification Bid.
If required, inspection visit will be made by client for job of similar nature of the work under reference .
Decision of the GMDC Management regarding pre- qualification based on the
documents furnished by the bidders contractors will be final and binding to all the bidders and no correspondence will be entertained from any of the bidders
in this regard.
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The Corporation reserves the right to reject any or all the Technical Bids for
pre- qualification without assigning any reasons there of.
The Corporation reserves the right to allot the work in parts to more than one agency whose Technical Bid is qualified for the work.
All decision to award the work will be made by employer.
The Engineer in charge or any other Officer authorized by the Corporation is
entitled to ask the contractor to discontinue any work which does not meet the expected and/or specified standards.
The selected tenderer will have to enter into an agreement with the Corporation on a stamp paper of Rs.100/- to be provided by the selected
tenderer in the form approved by the Corporation covering all terms and
conditions interalia that are advertised and stated in this tender form and those which may be agreed upon or modified by both parties during
subsequent correspondence / discussions / negotiations.
Dated Signature & Stamp of the Contractor
8
Chapter I
INSTRUCTIONS TO THE BIDDERS
Bidders are advised to read the instructions, evaluation norms and other terms and conditions described in these documents under different Chapters carefully before making their offer. In case of any doubt they may seek clarification from Manager
(Civil) available at the head office of the corporation at Ahmedabad.
THE TENDER & THE OFFER: It is a three-bid system. The bid is required to be submitted on line at
https://nprocure.com by the date and time prescribed in the tender notice as under: Part – I Preliminary Bid
- To be submitted online about the details of Tender document fee and EMD.
Part - II Technical Bid - Technical bid documents are to be submitted on line. However, the
documents required to be submitted in support of experience, financial position, status of the bidder, machinery and equipment owned by the bidders etc. as well as tender fee and EMD in the desired form shall be
placed in sealed cover super-scribed “TECHNICAL BID, Tender No. , and Name of work”, should be submitted separately at Corporate Office,
Ahmedabad before stipulated time.
Part – III Price-bid
- To be submitted on line before the stipulated time. Opening of bids
a. e-tendering procedure is explained in detail in Chapter – II.
b. Preliminary bids will be opened after verification of receipt of payment towards Tender document fee and EMD. The bidders will able to view it
on their computers on date and time notified in tender notice. c. On verification of the supporting documents, technical qualification of the
bidders will be assessed. The successful bidders will be communicated
the date and time of on line opening of price bids by fax or telephone or email . However, all the bidders will be able view the price bids online on
their computers.
9
Corrigendum:Corrigendum:Corrigendum:Corrigendum:
Some times issue of Corrigendum may be necessary to clarify doubts raised or to
make some corrections. All such corrigendum shall be displayed on web site
http://gmdc.nprocure.com only. The bidders are therefore advised to refer to this web
site from time to time to keep them updated.
10
CHAPTER- II
e- Tendering ( Online Tendering ) Instruction to Bidders
Further details of this tender are as under
1.0 Particulars: Tender No. 09/PP/CC ROAD/2011
Construction of Reinforced Cement concrete road in Silo area at
Aktrimota Power project ,village Nani Cheer , Tal: Lakhpat, Dist:
Kutchh
2.0 Down loading of Tender Documents
2.1 Bid document will be available on web site up to date shown above
2.2 Bidders wishes to participate in this tender will have get them self
registered on web site https://nprocure.com
3.0 Digital Certificate
3.1 Bidders who wish to participate in on line tenders will have to procure / should have legally valid digital Certificate as per Information Technology
act 2000 using which they can sign their electronic bids. Bidders can procure the same from any of the license certifying Authority of
India or can contact (n) code solutions- a division of GNFC Ltd, who are licensed certifying Authority by Govt. Of India
3.2 All bids should be digitally signed, for details regarding digital signature certificate and related training involved the below mentioned address should be contacted
(n) Code Solution A division of GNFC
301, GNFC Infotower, Bodakdev, Ahmedabad- 380 054
Tel: +91 26857316/17/18 Fax: =91 79 26857321 E-mail: [email protected]
Mobile: 9327084190 , 98985889652
3.3 Bidders who already have a valid Digital certificate need not procure a new
digital certificate .
4.0 On line Submission of Technical & Price Bid
4.1 Bidders can prepare & edit their offers number of times before tender submission date & time . After tender submission date & time , bidder can
not edit their offer submitted in any case. No written or online request in this regard shall be granted.
4.2 Tenderer shall submit their offer , i.e Technical bid as well as Price bid in Electronic format on above mentioned website & date shown above after
Digitally signing the same.
4.3 Offers submitted without digitally signed will not be accepted
4.4 Offers in physical form will not be accepted in any case
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5.0 Submission of Tender Fees and other Documents
5.1 Tender fee: Rs1500/-(Rupees One thousand five hundred only) by DD in favour of ’GMDC Ltd’ payable at Ahmedabad from any nationalized or
HDFC/IDBI/ICICI/AXIS Bank Only. Demand Draft issued after the last date and time of submission of bids will not be considered or accepted.
5.2 Earnest money deposit: Rs. 29,100/- (Rs. Twenty nine thousand one hundred only ) by DD in favour of ’ GMDC Ltd’ payable at Ahmedabad from any nationalized or HDFC/IDBI/ICICI/AXIS Bank only. Demand Draft
issued after the last date of submission of bids will not be considered as a valid or accepted in any case.
5.3 Bidder shall have to submit D D for Tender fee, EMD and other documents as mentioned above in physical form so as to reach on date shown above,
during office hours to Manager(Civil), Civil Department, GMDC Limited ‘Khanij Bhavan’ , 132’Ft ring road, Nr. University Ground, Vastrapur, Ahmedabad- 380 052 in person only .
5.4 Bidder has to submit the document as said in 5.4 above and no other
condition in any form shall be considered at all, at the time of evaluation of the tender, i.e. the bidder shall have to submit unconditional offer without
differing from any of the tender condition.
6.0 Opening of Tender
6.1 Opening of bid documents will be held on Date & time shown above in the office of GMDC Ltd, Manager(Civil), Civil Department, at ‘Khanij Bhavan’ ,
132’Ft ring road, Nr. University Ground, Vastrapur, Ahmedabad- 380 052 .
6.2 After successful completion of Technical Evaluation, price bid of only those
bidders would be opened online who are found to be substantially responsive
7.0 Contacting Officer
7.1 Further details / clarification , if any required, will be available from
Manager(Civil), GMDC Ltd, , Civil Department, at ‘Khanij Bhavan’, 132’Ft ring road, Nr. University Ground, Vastrapur, Ahmedabad- 380 052 Ph no. 079- 2791 3200
7.2 In case bidder needs any clarification /assistance or if training required for participating in online tender , they can contact at following office
(n) Code Solution A division of GNFC
301, GNFC Infotower, Bodakdev,Ahmedabad- 380 054 Tel: +91 26857316/17/18, Fax: =91 79 26857321
E-mail: [email protected] Mobile: 9327084190 , 98985889652
12
8.0 General Instructions:
8.1 The fees for on line tender document will not be refunded under any circumstances
8.2 EMD in the form specified in tender document only shall be accepted.
8.3 Tenders without Tender document fees, earnest money deposit (EMD) and
which do not fulfils all or any of the condition or submitted in complete in any respect will be rejected.
8.4 Tenderer approved either by the Central/ State Govt. or Central / State Govt. undertaking is not exempted by this corporation for paying EMD , SD
etc.
8.5 Conditional tender shall not be accepted.
8.6 This tender notice shall form a part of tender document
8.7 Tenderers are advised to read carefully the “Instruction for Tenderer” and
:eligibility criteria” contained in the tender document s
8.8 The Internet site address for E-Tender is www.nprocure.com
8.9 Free training camp for bidders will be organized on every Saturday between 1.0 to 5.00 p.m. at (n) code solution, A division of GNFC , 301, GNFC
Infotower , Bodakdev, Ahmedabad – 380 054 . Bidders are requested to take the benefit of the same.
8.10 The Corporation reserves the right to reject any or all the tenders or split the work between more than one bidders without assigning any reason thereof. .
8.11 Tenderer is requested to quote rates as per the terms and conditions mentioned in the Tender Document Part I and Part II. Tender submitted for
part items will not be considered and will be rejected. 8.12 Tenderer has to do this work strictly according to the drawings and
specifications provided by GMDC and which together with general conditions, technical specifications, bills of quantities and contract
agreement , will be called “ Documents of Contract
8.13 The selected Tenderer shall enter in to an agreement with the corporation,
on a stamp paper of Rs. 100/- which will be provided by the selected Tenderer, in the form approved by the corporation covering all terms and conditions .
13
Check List Of Documents Enclosed With TenderCheck List Of Documents Enclosed With TenderCheck List Of Documents Enclosed With TenderCheck List Of Documents Enclosed With Tender
Sr. No. Particulars Declaration (Strike out whichever is not applicable)
1 Check list of documents in the prescribed proforma, Yes / No
2. Earnest Money deposit paid for the value as indicated in Notice Inviting Tender,
Yes / No
3. Formats enclosed-dully filled in and signed along with all required enclosures , complete as per Instruction to bidder
4 Documents /details as per Status of the Bidder, with documentary proof
Yes / No
14
CHAPTER - IV Criteria for evaluation of Technical bid Following details are requested to be furnished with documents to qualified in Prequalification bid for the tendered work:
Status of the Bidder
FORM- A
Sr no Item Details
01 Name and address of Company.
02 Phone no,
Mobile No
Fax No
E mail ID, Website
03 Name Of Concern Person
04 Whether Proprietorship /partnership/ Pvt ltd / Limited co or any other
05 Documentary Evidence for Sr no 4 to be attached.
06 Technical qualification and experience of the proprietor or partners and leading technical employees of the firm with detailed Biodata.
07 List of persons involved in providing comprehensive services with their qualification experience and designation
08 Number of years of experience in construction field.
09 Income tax PAN Registration No Copy [Copy to be enclosed]
10
Registration Certificate as per statutory requirement under contract labour laws (If you have for the work executed of any type issued by Authority submitted)
Yes/ No
11
Whether enlisted as approved Contractor with GOG / Public Under taking /SEB / others if so please furnish details and copy of certificate in separate sheet.
Yes/ No
15
12
Tax No. details. VAT [State Sales Tax] No
Central Sales Tax C.S.T No
Service Tax No.
13 Provident Fund Registration Number – Copy attached
Yes/ No
14 Indicated details of Arbitrations/legal proceeding in last ten years.
15 Penalty Clause - Accepted
Penalty for the work delayed /non
completion/ non performance of the
works will be imposed as
mentioned in Technical bid-I –
Yes/No
16 Prices/Charges- Accepted Prices / charges should be firm and fixed. Quoted price included all man power, required material ,Cement , steel, scaffolding ,tools ,tackles , safety measures, PF contribution, , all taxes, service tax , VAT etc. . No price increase will be allowed during tenure of contract due to any reason.
Yes/No
17 Payment Terms – Accepted
Yes/No
18 I. T. and other taxes Deduction.-Agree Taxes will be deducted as per prevailing Government rules from the monthly bill
Yes/No
19 Validity of offer –Accepted Yes/ No
20 Work completion period as per price schedule- accepted
Yes/ No
21 Deviation sheet attached Deviation sheet to be attached by the bidder mentioning any deviation in technical & commercial . If there is no deviation then with ,No deviation sheet ,submitted on letter head of the bidders
Yes/ No
22 Declaration sheet - Attached Declaration in prescribed format on letter head of the bidder
16
FORM- B
Sr no Item Details
01 Latest copy of [ not later than one year) solvency certificate for amount not less than Rs.4.0 lacs of any Nationalised or IDBI/ICICI/HDFC/AXIS Bank only .
Name of Bankers Full Address: Phone Nos. Fax No.
02 Turnover / profit during last three years certified by charted Accountant
Bidder should have minimum annual turn over of Rs. 30 lac
for any one year of last five years .
Year 2009-10 2008-09 2007-08 2006-07 2005-06
Turn over In Rs.
Profit after Tax in Rs
03 Registration Certificate Copy
with minimum ‘D” class in
Buildings Category in the state
of Gujarat or equivalent class in
other state or CPWD (Copy
attached)
Yes/No
04 Name of the company for whom work carried out during last five years with copy of orders and satisfactory job completion certificates.
Minimum two satisfactory work completion certificates of clients/ Work orders , out of one certificate having single value of work Rs. 12.0 lacs in single year during the last five years.
Sr no Name Of Client /Nature of work
Work Order No Date of commencement and date of completion
Value. In Rs.
17
05 Details of Equipment /Machinery related to above work , available with your firm or at your work site mentioned and certified on your letter head .
1. Mixer machine Mixer machine Mixer machine Mixer machine
2. VibratorVibratorVibratorVibrator
3. Cube mouldsCube mouldsCube mouldsCube moulds
4. Levels Levels Levels Levels
5. CenteringCenteringCenteringCentering and shuttering and shuttering and shuttering and shuttering
materialsmaterialsmaterialsmaterials 6 Other machineries & Other machineries & Other machineries & Other machineries &
equipment required for the equipment required for the equipment required for the equipment required for the
work work work work of Tremix and road workof Tremix and road workof Tremix and road workof Tremix and road work
All above information submitted are true the best of our knowledge
Note:
1) Decision of the Management regarding the technical qualification is final and
binding to the tenderer and no correspondence will be entertained in this regards there after.
2) It is desirable to furnish all information with necessary documents.
18
CHAPTER - VI
GENERAL INSTRUCTIONS TO THE BIDDERS.
1. Any conditional Tender will not be entertained and will be rejected.
2. Bidders are advised to visit the site to study the actual working conditions,
before submitting its offer. 3. Successful Tenderer is required to insure the whole work and their personnel
under Workman Compensation Act against any accident, minor and major injuries arising out of the work situation. GMDC will not pay any charges against
the same. 4. The successful Tenderer shall have to start the work within period of 15 days
from the date of Letter of Intent. In case of non-compliance with the above condition, the action may be taken.
5. The contract shall be item rate contract. The rate quoted is inclusive of all labour
and material required for the Job.
6. Tenderers are expected to quote competitive and workable rates .
7. The Scope of work under this Tender is “providing and laying /fixing “the
materials. In the event of missing of above phrase in the description of schedule
of quantities will not mean that materials will be supplied by GMDC and Tenderer has to deploy only laborers for completing the work.
8. Quantity mentioned in schedule of quantities against each item is only for
guidance to quote the rate and no claim will be entertained on either increase or
decrease in the quantity.
9. You have to make your own arrangement for water and electricity for construction work . If water and Electricity will be supplied by GMDC at one point than charges will be recovered at the rate of 1 % and 0.5 % of cost of bill
amount respectively .
19
10. No escalation in price / rate will be allowed on any ground. Even if there is a
delay in completion of the work due to client, then extension in time limit may be granted with an explicit understanding that no price escalation will be paid.
However, in any case no claim is entitled for idle machinery and man power. 11. No extra item/ Additional work would be executed without getting the approval .
If there may be any extra work , contractor have to brought to the notice to GMDC well in advance with expected cost of execution .
12. In absence of detailed specifications, the work should be carried out based on
either relevant IS code and /or fair engineering practice.
13. No mobilization advance shall be given by GMDC for this contract.
14. All the rates quoted by the Tenderer must be inclusive of all required
materials , cement , steel ,labours ,taxes and duties applicable like, ,
sales tax, Service Tax, Professional Tax, turn over tax etc, scaffolding , transportation loading, unloading at site etc.
15. Successful Tenderer will have to submit three copies of detailed bar chart in the
manner as per the Performa issued by the client , for timely completion of the work
16. Tenderer is required to submit a copy of PF registration number received from RPFC office along with the tender, failing which the tenderer will be rejected
summarily.
RA bill must be submitted along with the names of the laborers employed for
the work, salaries / payment made to them, PF code No. , amount of P.F. deducted from the salary made to the labours and employer’s contribution
amount deposited in RPFC office till the previous month duly certified by project office, failing which no payment will be made for the RA bill submitted by the Contractor .
17. The Tenderer will have to submit ‘NO DEMAND CERTIFICATE’ along with the final
bill of the work, as per the Performa given. 18. Successful Tenderer is supposed to enter in to an agreement with the
corporation on an appropriate stamp paper ( to be provided by the contractor) after accepting the Letter of Intent .
19. The quoted rates should hold good for working as per drawings related from time
to time.
20. In overall interest of work and for better co-ordination Engineers in charge may
ask the contractor to stop the work for time being for which no compensation will be paid.
20
21. You will abide by the provision of labour laws , contract labour regulations and Abolition act (contract Act-37 of 1970) pertaining to the employment of the
labour and shall get your self register with regional provident fund commissioner and infirm the corporation about the registration number by submitting the copy
of the number allotted to you by RPFC . You have to submit the copy of labour license from the competent authority for the subject work.
22. Contractor shall be responsible for and shall pay any compensation to your workman payable under the workman’s compensation Act, 1923(VII of 1923) for
injuries, cause to the Workman. If such compensation is paid by GMDC as principal under sub-section(1) of section 12 of the said act on behalf of the contractor . It shall be recovered by GMDC from you under section (2) of the
said section . You shall pay such amount of compensation on demand , failing which same will be recovered from your running bills .
23. Contractor has to submit month wise labour payment record duly certified by GMDC labour welfare officer /HR dept, along with RA bill, failing which no payment will be made for the respective RA bill.
24. Roads , passages, approach at work site should be kept clean all the time..Material/machineries’ should be stack/ kept in proper manner so it should
not obstruct day to day vehicular traffic .
25. The contractor has to produce bill of the materials use in the execution if ask for by the client or consultant.
26. Bidders has to erect the Board, mentioning work details at work site at his own
cost .
27. The tenderer will have to submit “Royalty Clearance Certificate “ received from
District C.G.M. Office along with the final bill of the work.
21
CHAPTER VII
General Terms And Conditions Of Tender:
1) Prices:
Prices quoted by the tenderer should be firm and no price increase will
be allowed to the tenderer during the supply period.
2) Payment Terms and Running Bills:
Invoice/ Bill should be sent in duplicate . [Please mention our LOI/Work Order no in the invoice without fail]. Original invoice, Measurement Sheet
Materials Test Certificates if any should be sent to project with a copy to head office for reference. The payment procedure will be carried out on original copy only .
MODE OF PAYMENT OF RUNNING BILLS:
The contractor will submit running bill with required all documents for the work executed for the minimum value of Rs. 7.5 lacs . Each running bill
shall be accompanied with detailed measurement sheets duly certified by the Engineer In charge or authorized person of GMDC and Consultant .
RA bill will be paid at 75 % of the amount payable after applicable recovery
under this contract by Engineer in Charge /general Manager(Proj) at the
Project office .
Balance 25 % amount of running Bills become payable at HO , after
deduction as per following and after approval from management within 30
working days from the date of receipt of the bill at HO , after deducting there
from
A Payments shall be released for the work executed in all respects as per
BOQ, drawings and specifications .
B Retention money deposit will be deducted from RA bills @ 5 % of the
value of the bill amount. C Income Tax, Turn over tax etc. as per the provisions of respective act
from time to time.
D Security deposit at 5 % of the contract value exceed than tendered value .
E. Income tax inclusive of surcharge at the prevailing rate from time to time shall be deducted from the running account bills.
22
F Works contract tax / sales tax TDS, prevailing from time to time as per rule shall be deducted from the running account bills.
G Cost of any services provided by GMDC and/or material supplied by the
GMDC. H RA bill must be submitted along with the names of the employee labours
employed for the work, salaries/payment made to them, PF code No.,amount of P.F. deducted from the salary made to the labours and
employer’s contribution amount deposited in RPFC against each and copy of challans for the amount deposited in RPFC office till the previous month duly certified by project office, failing which no payment will be
made for the RA bill submitted by the Contractor.
I Other deduction either statutory or other work reason, if any.
3) Earnest Money Deposit.(EMD) / Security Deposit (SD) / Retention Money
a) The tender must accompany Earnest money deposit of Rs. 29,100/-
only by demand Draft of Nationalised Bank OR HDFC/ICICI/AXIS/IDBI Bank only or the amount as stated above in favour of Gujarat Mineral Development Corporation Limited, payable at Ahmedabad. Cheque or
Bank Guarantee will not be accepted.
b) Earnest money deposit paid as above will be refunded to unsuccessful tenderer only after finalizing of tender.
c) Successful tenderer has to pay full amount of Security Deposit @ 5% of the contract value including EMD by Demand draft of Nationalised
Bank/IDBI/HDFC/AXIS/ICICI within 7 days from the date of issue of LOI. Payment against the work as well as detail work order will be issued only after submission of Security Deposit . If you fail to pay
security deposit within7 days from the date of LOI, necessary action may be taken and EMD paid by you shall be forfeited .
d) Earnest Money Security deposit and Retention Money will not bear any
interest.
e) If successful tenderer does not pay security deposit and does not commence work as per tender / LOI/ Work Order E.M.D. paid will be liable to be forfeited by the corporation.
23
f) Security deposit paid by the successful tenderer shall be liable to be
forfeited by the corporation, if he does not able to carry out the work in accordance with the terms and condition of the tender / LOI/Purchase
Order/ Work Order. This will not also prejudice that Corporation will complete the work at your risk and cost.
g) Tender received without E.M.D. Will be outright rejected.
h) No relaxation on EMD/SD for any small-scale industry shall be considered.
i) Security deposit will be refunded with in three months after the completion of defect liability period of Twelve Months from the date of
completion of work, on demand by Contractor.
j) Retention money deposit will be deducted from RA bills @ 5 % of the
value of the contract amount, which will be released after one month from completion of work .
4) Work Completion time Schedule.
Work Completion time is the essence of the contract and if Completion of Work not made as stipulated or contractor abunded the work then
corporation shall be at liberty to execute the work at contractor’s risk and cost and if thereby any extra expenditure is involved, the same shall be
debited to tenderer’s account, If corporation is unable to execute and complete the work from alternate source in time and if corporation suffers any consequential loss, tenderer will have to bear the same. Corporation in
that case will forfeit the security deposit and will also have the right to recover the claim against party for damage incurred.
5) Validity.
Validity of the tender should be for 180 days from the date of opening the Price Bid and if required by the corporation, the tenderer will have to extend
the validity for a further period of 30 days.
6) Taxes / VAT/Service Tax.
Taxes should be stated as applicable. All the rates quoted by the Tenderer
must be inclusive of all taxes and duties applicable like , Royalty, Octroi , transportation , labour , sales tax, Service Tax, Professional Tax, turn over tax, loading, unloading at site
TDS: TDS will be deducted from bill amount as per the prevailing Govt. Rules & regulations.
24
7) Work Completion time Penalty.
The subject work should be completed with in Four months .
If work is not completed as per work completion time penalty will be levied @ 0.1 % of contract value per day from the date of delaying the said work up to the maximum 10 % of contract value. This will not absolve the
contractor from the responsibility of getting the balance work done by client at his risk and cost through any other contractor.
8) Loss and Damages:
Any loss or damages or deterioration of the material in transits shall be at
the cost of the contractor . It shall be at the discretion of the corporation to reject, damaged or spoiled material, if so noticed. During the work , if any property of client damaged than book value/ repair cost + 20 % of same
should be recovered from contractor .
9) Insurance:
Third party liability and Transits insurance of the consignment/ Insurance of tenderer’s manpower are to be provided by the tenderer at his cost.
10) Approval:
For the subject tendered work , GMDC decision for acceptance or rejection of the Quality Of work will be final and binding on you.
11) Defect Liability Period. :
The subject work should have defects liability period of 12 Months from the date of completion of work.
12) The corporation also reserves right to amend, alter, increase or decrease the scope of work and payment will be made accordingly.
13) If tender submitted in contravention of the terms and conditions stated
herein will not be considered.
14) In case of any dispute or difference of opinion in the interpretation of any of
the terms and conditions of this tender, the decision of the Managing Director of Corporation shall be final and binding to all.
15) The courts at Ahmedabad in Gujarat state only will have jurisdiction to deal with and decide any legal dispute or contravention between the parties hereto.
16) Statutory Obligations:-
25
I. That the “Bidder shall obtain licence under the Bombay Shops and
Establishment Act and it shall pay wages and benefits in accordance with the
applicable laws and shall not pay less than as notified by the Government Authorities from time to time and shall maintain the employment records as
required under applicable laws. II. That the Bidder shall get his own Licence under Contract Labour
(Regulation and Abolition) Act, it shall be binding to get the same renewed from time to time and shall maintain all the records as per the act.
III. That the Bidder shall be responsible to enroll his employees, deduct,
add and deposit in the relevant accounts the contributions as required under
the Employees State Insurance Act, 1952 and the Employees Provident Funds and Miscellaneous Provisions Act 1952 and any other enactment's covered
under the various applicable labour laws as well as maintain all books of records for the staff and employees deputed by it for this contract such as required under any laws applicable. The Bidder shall also furnish a copy of such
statements as documentary proof to the GMDC.
IV. That if the Bidder is not covered under the Employees State Insurance Act, 1952 then it shall be the duty of the Bidder to take appropriate insurance cover under the Workmen Compensation Act and take Group Personal Accident
Policy for all the employees deputed at the premises of the “First Part”.
V. The Bidder has to issue to the employee's Identity card with their photos and shall also maintain relevant register.
VI. That the Bidder shall give leave/holiday to its workforce as per the provisions of labour laws applicable.
VII. That the Bidder would comply with all applicable laws and maintain all
such necessary records as necessitated under such enactment's.
VII. In case were the contract period is over or the contract is terminated by either party the “Second Part” shall employ the personnel deployed by it at
other place. In case the workmen recruited by the GMDC is not provided work at any other place and are discharged then all the eligible workmen shall be paid retrenchment compensation, gratuity, bonus, earned leave and other
benefits payable under the labour laws.
26
On Tenderer’s Letter Head
From: Ref: Date:
To
Managing Director Gujarat Mineral Development Corporation Limited [A Government Of Gujarat Enterprise]
‘Khanij Bhavan, Nr. University Ground, 132 Ft. Ring Road Vastrapur
Ahmedabad 380 052
Sub: Earnest Money Deposit Against TENDER No. 09/PP/CC ROAD /2011
Dear Sir,
With reference to above and as per terms and conditions of tender we are sending Herewith D.D. / Pay Order NO ___________________ Dated ______________Of
____________________________________________ [Name Of Bank and
Branch] Payable at Ahmedabad for Rs. 29,100/-- being the amount of E.M.D.
Kindly acknowledge the stamp receipt.
Thanking You
Yours Faithfully
[Name and Signature]
27
On Tenderer’s Letter Head
D E C L A R A T I O N I From: Ref: Date: To Managing Director Gujarat Mineral Development Corporation Limited [A Government Of Gujarat Enterprise] ‘Khanij Bhavan, Nr. University Ground, 132 Ft. Ring Road Vastrapur Ahmedabad 380 052 Sub: Declaration. Ref: TENDER No. 09/PP/CC ROAD/2011 Dear Sir, I / We have carefully gone through and clearly understood the tender notice tender terms and conditions and tendered to execute and satisfactorily complete the whole work strictly in accordance with the said Tender. I/We hereby solemnly declare that none of Our Partners Jointly or Severally or Our Firm / Company / Associates company have not been Black Listed by the Central Government or any State Government or It’s Undertaking. I/We hereby further declare that, if the above Declaration is found untrue, G.M.D.C. Ltd., shall be entitled to take any action against us severally and or individually or our firm / Company, In this regard in any manner that may deemed fit by G.M.D.C. Thanking You Yours Faithfully [Name and Signature & Stamp]
28
On Tenderer’s Letter Head
DECLARATION II
FROM: Date:
To, Managing Director Gujarat Mineral Development Corporation Limited [A Government Of Gujarat Enterprise] ‘Khanij Bhavan, Nr. University Ground, 132 Ft. Ring Road Vastrapur , Ahmedabad 380 052 SUB: TENDER No. 09/PP/CC ROAD/2011
Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW
Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Dear Sir, I/we having carefully gone through and clearly understood the preface, Tender notice, details to be furnished along with technical bid, plans, specifications and conditions of contract for the above mentioned work, do hereby Tender to execute and complete the whole work strictly in accordance with the said plans and specifications and conditions of contract at the rates set out in the priced schedule and quantities attached hereto. I/we agree to finish the whole work as per instructions within Four months from expiry of fifteen days from the date of issue of Letter Of Intent or actual commencement of the work which ever is earlier. I/We have deposited as EMD Rs. 29,100/- by D.D. along with the technical bid in your office which amount is not to bear any interest and my/our do hereby agree that this sum shall be liable to be forfeited by the corporation at its sole discretion, in the event of your accepting my /our Tender and my/our failing to execute the contract when called upon to do so. It is understood by me /us that the lowest or any Tender will not necessarily be accepted and that no reason shall be given for such non acceptance I/We agree to keep our offer valid for 180 days or for a further period as would be desired by the corporation, from the date of the opening of the Price bid. We agree to all the terms and conditions of the technical bid. Thanking You Yours Faithfully [Name and Signature & Stamp]
29
On Tenderer’s Letter Head
NO DEMAND CERTIFICATE FORMAT Ref: Date: From: To Managing Director Gujarat Mineral Development Corporation Limited [A Government Of Gujarat Enterprise] ‘Khanij Bhavan, Nr. University Ground, 132 Ft. Ring Road Vastrapur Ahmedabad 380 052
Name of Work: e TENDER No.09/PP/CC ROAD/2011
Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW Construction of Reinforced Cement Concrete Road in Silo area at 2x125 MW
Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Akrimota Power project , Village Nani Chher , Tal: Lakhpat, Dist: Kutchh . Dear Sir, We_______________________________________ hereby certify that we have received the payment of all our bills in full and final settlement of our claims in respect of e tender no-
09/PP/CC ROAD/2011 ,Construction of Reinforced Cement Concrete Road in Silo
area at 2x125 MW Akrimota Power project , Village Nani Chher , Tal: Lakhpat,
Dist: Kutchh . The payment received by us is in full and final settlement of our all the claims towards the amount with respect to the work under reference. Hence, we do not have any outstanding claim against GMDC for the work under reference. We shall not claim any further amount from GMDC in future, either one way or the other. This certificate is given without any prejudice and in the presence of two witnesses. Signature & Address of Witnesses _______________________
(1) _______________ Signature & Stamp of the Firm (2)_______________
30
SCHEDULE OF DEVIATIONS
TENDER NO: e TENDER No. 09/PP/CC ROAD/2011
Bidders shall indicate / bring out all Commercial & Technical deviations, clause by, clause in this Schedule, but any commercial deviation will not be accepted by GMDC . if the Schedule is not submitted duly filled in, the bid will be considered as incomplete. (In case of ‘NO DEVIATION’ the Schedule be submitted mentioning ‘NO DEVIATION’).. If nothing is mentioned than it will be considered that bidders have “no deviation” Commercial Deviations For:- Sr. Clause No. Deviation Justification No
Technical Deviations For:- Sr Clause No Deviation Justification No The tenderer hereby certify that there is no technical &commercial deviation from the purchaser’s specification. Name of firm: ------------------------ Signature of Bidder: ----------------------- Name of Bidder: ------------------------ Date: ------------------------- Seal of the Company
31
11.00 ROAD WORK11.00 ROAD WORK11.00 ROAD WORK11.00 ROAD WORK
.01 Earthwork.01 Earthwork.01 Earthwork.01 Earthwork
Earthwork in cutting, filling, embankment, compaction and disposal of surplus earth
shall be as mentioned in specification of "EXCAVATION AND EARTHWORK".
.02 Consolidation of Sub.02 Consolidation of Sub.02 Consolidation of Sub.02 Consolidation of Sub----gradegradegradegrade
The sub grade shall be consolidated with power road roller of 8 to 12 tone. The roller
shall run over the sub grade till the soil is evenly and densely consolidated and behaves
as an elastic mass (Roller shall pass minimum of five runs on the sub grade). All
undulations in the surface that develop due to rolling shall be made good with earth or
quarry spoils as the case may be and the sub grade re-rolled.
.03 Soling Course.03 Soling Course.03 Soling Course.03 Soling Course
The stones in soling shall be hand packed with greatest length across the road. All
interstices between stones shall be wedged in with smaller stones of suitable size, well
driven in, to enable tight packing and complete filling of interstices. Such filling shall be
carried out simultaneously with the placing in position of soling stone and shall not lag
behind. The soling shall then be thoroughly consolidated with power roller of minimum
8 tone weight, starting at edges and working towards the center. The roller shall run
over the same surface of rolling for at least eight times till the soling course is well
consolidated. Speading of murrum as directed by Engineer shall be laid on top of
soling course. This shall be watered and rolled before the wearing course is laid.
.04 Wearing Course (W.B.M.).04 Wearing Course (W.B.M.).04 Wearing Course (W.B.M.).04 Wearing Course (W.B.M.)
One or two as specified wearing courses of stone aggregate as per required thickess
or as specified, shall be provided. The first course shall be consolidated and thrown
open to traffic at least for a period of 2 to 6 weeks, depending upon the intensity of
traffic and the period available for completion of the work. The surface of the first
course shall then be repaired by providing stone aggregate as specified to be filled in
undulation and the second course then laid accordingly to profile and consolidated. The
procedure of consolidation as given below should be repeated for both the courses
separately.
a. Consolidation
The stone aggregate shall be consolidated by dry rolling and wet rolling with power
roller of 8 to 12 tonnes minimum weight. In case of straight reach of the road, the rolling
shall be commenced at the edges and worked towards the center. In case of super
elevated curve the rolling shall commence from the inside edge of the curve to the
outside edge.
b. Dry Rolling
The stone aggregate shall first be rolled dry and then lightly sprinkled with water of just
sufficient quantity to moisten the earth cushioning below and to facilitate interlocking of
aggregates. Rolling shall continue till the aggregate has become well consolidated and
do not get displaced. During the process of rolling, camber and grade of the aggregate
surface shall be checked. All undulations shall be loosened by hand racking or racking
tools surplus material removed from high spots and depressions filled with surplus and
fresh material and the surface rolled again, small quantities of aggregate having been
kept in stock for this purpose. When all the surface defects are removed dry rolling shall
32
be stopped, as otherwise the edges of the aggregate may get crushed, which is not
desirable.
c. Wet Rolling
After the dry rolling has been completed as described above, the road surface shall be
watered copiously so as to keep the water level upto the top of the aggregate and
rolling with power roller proceeded with, till the roller makes no visible impression on the
surface and the interstices between the stone have been filled up by consolidation of
aggregate and a piece of 25 mm size stone placed on surface gets crushed under the
roller without being driven in.
d. Rolling with Blinding Materials
After wet rolling of the wearing surface course, the surface shall be tested with a 3m
straight edge laid parallel to the center line of the road and any irregularity exceeding 12
mm shall be corrected by loosening the surface and re-compacting the same after
adding or removing materials as required. If further required by the Engineer, the
surface shall be checked with long string also. Kankar moorum red bajri in specified
ratio shall then be spread evenly over the surface to a 6mm to 12mm thickness
copiously watered and rolled till the slurry, after filling all voids, shall form a wave before
the wheels of the moving roller. Wet bajri sticking to the wheel shall be removed
simultaneously when the roller is moving, by spades and sprinkling water on the
wheels. The rolling shall be done a minimum of four passes or till a hard smooth solid
surface is obtained.
Finished surface shall give a uniform appearance and the road shall be closed to traffic
till next day or lapse of 24 hours.
.05 Edging.05 Edging.05 Edging.05 Edging
Edging shall be done 225 mm wide and 110 mm deep or as specified.
.06 Dens.06 Dens.06 Dens.06 Dense bitumen Mecadam (Premix) surfacinge bitumen Mecadam (Premix) surfacinge bitumen Mecadam (Premix) surfacinge bitumen Mecadam (Premix) surfacing
a. Tack Coat
Cleaning: Prior to the application of tack coat, all dust, dirt, mud, animal dung, loose
and foreign material etc. shall be removed to 30 cm brushes, small picks, brooms, etc.
The material so removed shall be disposed of as directed by Engineer. The paving
bitumen (cut back bitumen) as mentioned in the specification shall be heated in a boiler
to a temperature specified above and maintain at that temperature. This paving
bitumen shall then be applied evenly to the already prepared dry surface by means of
pressure spray at the rate of 0.75 kg/sq.mts of the road surface. The binder shall be
applied longitudinally along the length of the road and never across it. The edges of
tack coat shall be defined by wire or other cord lines stitched in position.
b. Base course (Premix)
Preparation of Mix and Laying
The stone aggregate of 10 mm nominal size as defined later shall be surface dry and
contain not more than 2% moisture before use. It shall be screened of dust and
measured in boxes and then loaded into a drum mixer according to the capacity of this
drum. The aggregate shall be heated to facilitate mixing with the paving bitumen in cold
weather, where so directed by the Engineer. The stone aggregate will be used at the
rate of 3 cubic meters for 100 square meters of the surface area.
The paving bitumen (cut back bitumen) will be heated to a temperature as mentioned
in a boiler. This heated bitumen shall be poured over the aggregate in the drum mixer
at the rate of 64 kg per cubic meter of aggregate and mixing started and continued till
aggregate is uniformly coated with bitumen. This hot mix shall be spread on the road
surface immediately after the application of tack coat to a thickness sufficient to achieve
a thickness of 25 mm after consolidation.
c. Consolidation of Pre-Mix
33
When the mix is sufficiently tacking and stiff and has not become hard or brittle, the
carpet shall be compacted by a 6 - 8 tone roller until no impression is made thereby on
the newly laid surface. The rolling shall progress gradually from each side towards the
center. To prevent the pre-mix from adhering to roller wheels the wheels shall be
dampened by means of gunny bags soaked in water. Any high spots or depressions
which become apparent shall be corrected by addition or removal of pre-mix material.
The finished surface shall be thoroughly compacted true to the correct levels and
grades. Permissible tolerance will be as under:
Longitudinal section +6mm for every 6 meters.
Cross section +3mm from the entire designed section
d. Seal Coat (Premix)
In this paving bitumen (cut back bitumen) as specified earlier will be used at the rate of
1.5kg/square meter of the surface area and stone aggregate 10 mm nominal size
conforming to IS:383 shall be used at the rate of 1.1 cu.mtr. for 100 sq.meter of the
surface area.
The paving bitumen shall be heated as described earlier and applied on the surface.
Over this stone grit will be spread uniformly when the bitumen is still hot.
The surface will be rolled as described earlier.
TABLE FOR PREMIX CARPETINGTABLE FOR PREMIX CARPETINGTABLE FOR PREMIX CARPETINGTABLE FOR PREMIX CARPETING
Grade Temperature to which itGrade Temperature to which itGrade Temperature to which itGrade Temperature to which it shall be heated.shall be heated.shall be heated.shall be heated.
1 Cut back bitumens. 163 degree C to 171 degree C.
2 Paving asphalt 30/40 or 80/100 heated and then mixed with solvent atmospheric
temperature at the rate of 70 gm/kg. of asphalt. 149 degree C to 177 degree C .07
Demolition shall be carried out in such a manner as to cause as little in convenience as
possible to the workers and flow of work. The Contractor shall take all safety measures
for the people working on site. Demolition shall not affect the stability of the adjoining
structural elements. The Contractor must provide all requisite shoring, strutting,
needling or other supports to wall, roof etc. The Contractor shall alter, adopt and
maintain all such necessary temporary works as may be necessary from time to time
and finally clear away and make good all disturbed. Sound old bricks arising from
demolition, if cleaned and approved by Consultant shall be reused in foundations and
walls below ground level. If approved by Engineer, steel structural members shall be
reused after straightening. The Contractor shall be solely responsible for the safety of its
labourers and shall be liable for all deaths and damage at site.
CEMENT CONCRETE PAVEMENTCEMENT CONCRETE PAVEMENTCEMENT CONCRETE PAVEMENTCEMENT CONCRETE PAVEMENT
1. Proportion1. Proportion1. Proportion1. Proportioning of Concreteing of Concreteing of Concreteing of Concrete
1.1 Proportioning on the basis of strength:1.1 Proportioning on the basis of strength:1.1 Proportioning on the basis of strength:1.1 Proportioning on the basis of strength:
The concrete shall be made of materials accepted for the work and of the proportions
specified by the Engineer. The proportions shall preferably be determined after
laboratory test on materials proposed to be used unless other established data is
available and the mix that will produce a durable concrete of the desired consistency
and workability together with following specified strength shall be adopted. Where
thickness of the pavement is calculated on the basis of flexural stresses in concrete, a
mix that will develop a modulus of rupture on field specimens of not less than the
permissible flexural stress multiplied by the factor of safety assumed in design shall be
adopted with a minimum of 40 kg/cm2 (550 Psi) at 28 days. Where, however, the
thickness from the IRC. Table of recommended thickness given in appendix C are
adopted (IRC:15-1970), a mix that will develop a field compressive strength of 280
kg/cm2 (4000 psi) at 28 days or a corresponding modulus of ruptures (where data of
their proportionality for local material is available) shall be adopted. In other cases, this
34
information should be determined by prior laboratory test with adjustments for variations
in the field. Where, a heavy duty wear resistance is desired, such as for maneuvering
and storage areas of tracked vehicles or for anticipated concentrations of steel tire
traffic, a concrete with a minimum field compressive strength of 420 kg/cm2 (6000 psi)
at 28 days or its equivalent modulus rupture shall be adopted for wearing course of
concrete.
1111....1111....1111 Approximate proportionsApproximate proportionsApproximate proportionsApproximate proportions
The approximate proportion by weight (or by volume, only in unavoidable cases)
necessary to produce concrete satisfying the strength conditions using aggregates
from the sources designated, if furnished in the tender documents, are for guidance
only, it being expressly understood that this information is only for the convenience of
the bidder.
1.1.2 Field Mix1.1.2 Field Mix1.1.2 Field Mix1.1.2 Field Mix
After the award of the contract, the proportions, that is the field mix determined by the
laboratory for the particular aggregates approved by the Engineer shall govern. These
proportions will be corrected and adjusted by the Engineer to compensate for moisture
content in the aggregate or fluctuations in the grading of coarse and fine aggregate at
the time of use. Where fine aggregate is permitted to be measured volumetrically, due
allowance shall be made for its bulking.
1.1.3 Water1.1.3 Water1.1.3 Water1.1.3 Water----Cement RatioCement RatioCement RatioCement Ratio
The water content per batch of concrete shall be maintained constantly except for
suitable allowances to be made for free moisture and absorption by aggregates
determined from time to time during construction. Adjustments for workability shall be
made by variations in the ratio of the coarse to fine aggregate or improving upon their
grading without change in cement content or water-cement ratio. The slump of the
concrete mix for pavements compacted by vibration should not be more than 50 mm.
(2”). No price adjustment would be permissible for variations in the ratio of coarse to
fine aggregates necessitated from adjustment at site.
2. Equipments2. Equipments2. Equipments2. Equipments
2.1 General2.1 General2.1 General2.1 General
All equipments necessary for the proper preparation of the sub-grade sub-base, and
hatching, mixing, placing, finishing and curing of the concrete pavement shall be on the
project in good working condition and shall have been inspected by the Engineer -in -
charge before the paving operations are permitted to start. Throughout the construction
of the project, the construction agency shall maintain adequate equipment in first class
working condition to ensure proper prosecution of the work.
2.2 Mixer2.2 Mixer2.2 Mixer2.2 Mixer
Concrete mixer of adequate capacity shall be provided and it shall be of the batch type,
conforming to the requirement of IS:1991-1968 “Specification for Batch Type Concrete
Mixer (First Revision” and shall have a rated capacity of not less than 200 litres (7 cu.ft)
of mixed concrete. The mixer shall be equipped with an approved water measuring
35
device capable of accurate measurement of water required per batch. The mixer shall
preferably be equipped with a mechanically operated pump for filling the mixed tank.
The mixer, if specially specified, shall be equipped with an approved timing device
which will automatically lock the discharge lever during the full time of mixing and
release it at the end of mixing period; the device shall also be equipped with a bell,
adjusted, to ring each time the lock is released. If the timing device gets broken or out
of order, the mixer will be permitted to be used while the same is being repaired,
provided an approved time piece equipped with minute and second hands, is provided
and that each batch is mixed for one and half minutes. Pick-up and throw-over blades
in the drum of the mixer which are worn out 20 mm, (3/4”) or more in depth shall be
replaced with new blades.
2.3 Water2.3 Water2.3 Water2.3 Water----supply equipmentsupply equipmentsupply equipmentsupply equipment
The water supply equipment shall be of such capacity and nature as to ensure at all
times ample supply and adequate pressure for all the requirements of sprinkling sub
grade, making sub-base, mixing and curing of concrete etc. and all other requirements
of the work.
2.4 Sub2.4 Sub2.4 Sub2.4 Sub grade Template or Strike Boardgrade Template or Strike Boardgrade Template or Strike Boardgrade Template or Strike Board
The sub grade template or strike board shall be of a rigid construction, approximately
100 mm (4”) wide, and shall weigh at least 45 kg. (100 lb).
2.5 Hand Tamper2.5 Hand Tamper2.5 Hand Tamper2.5 Hand Tamper
The tamper shall be shaped to the cross-profile of the slab and shall weigh not less
than 10 kg/m (7 lb/ft). It shall be durably constructed of 75 mm. (3”) thick timber or of
steel of channel cross - section two feet longer than the proposed width of pavement
slab and sufficiently strong and rigid to retain its shape under all working conditions. If it
is of timber it shall be shod with steel. The timber shall be provided with handles which
are resilient and sufficiently long to enable tamping operations to be performed by men
in standing position.
2.6 Screed Board Concrete Vibrator2.6 Screed Board Concrete Vibrator2.6 Screed Board Concrete Vibrator2.6 Screed Board Concrete Vibrator
Screed board vibrator used for compaction and finishing of concrete shall comprise of
a wooden or mild steel screed with suitable handles. The screed shall be driven by
vibrating units mounted thereon either electrically or by compressed air or by a petrol
engine and propelled or made to travel on side forms. It shall conform to IS:2506-1964
“Specification for Screed Board Concrete Vibrators”.
2.7 Immersio2.7 Immersio2.7 Immersio2.7 Immersion Vibratorn Vibratorn Vibratorn Vibrator
Immersion Vibrator shall comprise of a vibrating head with suitable motive power either
of compressed air, electricity or of a petrol driven engine, rigid enough to ensure proper
control and manipulation in the mass of concrete. It shall conform to IS:2505-1968
“Specification for Concrete Vibrators, Immersion type (First Revision)”.
They shall be employed to ensure compaction of concrete along the forms and to avoid
any tendency in honey combing at the edges of the slab. In case of road slabs
exceeding 125 mm (5”) thickness, they shall also be employed at suitable spacing for
compacting the concrete over the entire width of the slabs in addition to screed board
vibrator.
36
2.8 Longitudinal Float2.8 Longitudinal Float2.8 Longitudinal Float2.8 Longitudinal Float
The longitudinal float shall not be less than 3.7 m (12”) in length and 150 mm. (6”) wide
and shall be properly stiffened to prevent fixing and warping.
2.9 Bridges2.9 Bridges2.9 Bridges2.9 Bridges
The bridges shall be so designed that when placed straddling the forms, no parts shall
come in contact with the pavement. They shall be sufficiently rigid.
2.10 Long2.10 Long2.10 Long2.10 Long----handled Wooden Flathandled Wooden Flathandled Wooden Flathandled Wooden Flat
The blade of the float shall be at least 1500 mm (5’) long and 150 mm (6”) wide. A
minimum of two floats shall be provided.
2.11 Belts2.11 Belts2.11 Belts2.11 Belts
The belts of canvas shall not be less than 150 mm (6”) wide and shall be at least 600
mm (2’) longer than the width of the slab. A minimum of two belts shall be provided.
2.12 Push Brooms2.12 Push Brooms2.12 Push Brooms2.12 Push Brooms
The push brooms shall not be less than 450 mm (18”) wide and be made from good
quality base fibre. The handle shall be at least 300 mm. (1 ft.) longer than half the width
of the slab. A minimum of four push brooms shall be provided.
2.13 3.0 m (10 ft.) 2.13 3.0 m (10 ft.) 2.13 3.0 m (10 ft.) 2.13 3.0 m (10 ft.) ---- Straight Edge Straight Edge Straight Edge Straight Edge
The straight edge shall remain true and rigid under working conditions and shall be
swung from suitable handles.
2.14 Edgin2.14 Edgin2.14 Edgin2.14 Edging Toolg Toolg Toolg Tool
The edging tool shall have a radius of 6 mm. (1/4”). The vertical limb shall extend to the
required depth. A minimum of two edging tools shall be provided.
2.15 Master Straight Edge2.15 Master Straight Edge2.15 Master Straight Edge2.15 Master Straight Edge
The material straight edge shall be of known accuracy so that it may be used for
checking other straight edges. It shall be made of steel or other suitable material, of
sufficient length and of sufficient rigidity to maintain its accuracy.
2.16 Other Small Tools2.16 Other Small Tools2.16 Other Small Tools2.16 Other Small Tools
Other small tools and equipment such as spades, shovels, iron pans, water pots, rods
etc., necessary to complete the work in accordance with the intent and meaning of
these specifications shall also be provided.
3. Forms3. Forms3. Forms3. Forms
3.1 Steel Forms3.1 Steel Forms3.1 Steel Forms3.1 Steel Forms
All side forms shall be of mild steel unless use of wooden sections are specially
permitted. The steel forms shall be M.S. channel sections and their depth equal to the
thickness of the pavement. The sections shall have a length of at least 3.0 m (10’)
except on curves of less than 45.0 m. (150 ft.) radius, where shorter sections may be
used. When set to grade and staked in place, the maximum deviation of the top
surface of any section from a straight line shall not exceed 3 mm. (1/8”) in the vertical
37
plane and 55 mm. in the horizontal plane. The method of connection between sections
shall be such that the joint formed shall be free from play or movement in any direction.
The use of bent twisted or worn out forms will not be permitted. bracing pins or stakes
shall be provided for each 3.0m (10’) of form and the bracing end support must be
ample to prevent the springing of the forms under the pressure of the concrete or the
weight or thrust of machinery operating on the forms. The supply of forms shall be
sufficient to permit their remaining in place not less than 12 hours after the concrete has
been placed or longer if, in the opinion of the Engineer, it should be necessary.
3.2 Wooden Forms3.2 Wooden Forms3.2 Wooden Forms3.2 Wooden Forms
Wooden forms may be used only when specifically provided for on the plans or in
special provisions with the exceptions that their use is herein approved for all curves
having radius of less than 45.0 m (150 ft.) Wooden forms shall be dressed on one side,
these shall have minimum base width of 100 mm. (4”) for slab thickness of 200 mm.
(8”) thick and equal in depth to edge thickness of the work prescribed. These forms
when used on straight shall have a minimum length of 3.0m. (10’). Forms shall be held
by stakes set at intervals not exceeding 2.0m (6’), two stakes to be placed at
each joint. The forms shall be firmly nailed or secured to the side stakes, and securely
braced at points, where necessary so that no movement will result from the pressure of
the concrete or the impact of the tamper and during finishing work. Wooden forms shall
be capped along the inside upper edge with 50 mm (2”) angle iron, well recessed and
kept flush with the face of the wooden forms.
3.3 Setting of Forms3.3 Setting of Forms3.3 Setting of Forms3.3 Setting of Forms
The forms shall be jointed neatly and shall be set with exactness to the required grade
and alignment. After the forms are placed and set, the earth under the base of the
forms shall be thoroughly tamped in an approved manners. Sufficient rigidity shall be
obtained to support the forms in such a position during the entire operation of
compacting and finishing that they will not at any time deviate more than 3 mm. (1/8”)
from a straight edge 3.0 m (10’) in length. Forms which show a variation from the
required rigidity or the alignment and levels shown on the plans shall be reset or
removed, as directed to maintain the forms at the correct line and grade. All forms shall
be cleaned and oiled each time before they are used. Forms shall be set, as herein
specified, for at least 150.0 m. (500 ft.) ahead of the mixer or in advance of the actual
placing of concrete.
4. Construction4. Construction4. Construction4. Construction
4.1 Mixing4.1 Mixing4.1 Mixing4.1 Mixing
The mixing of concrete shall be done in a batch mixer of approved type which will
ensure a uniform distribution of the materials throughout the mass, so that the mix is
uniform in colour and homogeneous. All concrete shall be mixed in quantities for
immediate use. Spilling of the materials at either end of the mixer shall be corrected by
reducing the size of the batch and in no case shall the volume of the mixed material
per batch exceed the manufacturer’s guaranteed capacity of the mixer. The drum of
the mixer shall rotate at a peripheral speed of approximately 600.0 m (200 ft.) per
minute. The batch of cement, fine aggregate and coarse aggregate shall be fed into
the mixer simultaneously and in such a manner that the period of flow of each is about
the same. The water for mixing shall be introduced into the drum within the first 15
seconds of mixing, and the entire contents of the drum shall be discharged before any
38
materials are placed therein for the succeeding batch. The skip shall be so maintained
and operated that each batch will be completely discharged into the mixing drum at the
loading of the mixer. The mixer shall be cleaned at suitable intervals while in the use.
4.1.1 Time of Mixing4.1.1 Time of Mixing4.1.1 Time of Mixing4.1.1 Time of Mixing
The mixing of each batch will continue not less than one and half minute after all the
materials are in the mixer.
0000
4.1.2 Re tempering4.1.2 Re tempering4.1.2 Re tempering4.1.2 Re tempering
The re tempering of concrete or mortar, that is, remixing with or without additional
cement, aggregate or water will not be permitted.
4.1.3 Correction for Bulking4.1.3 Correction for Bulking4.1.3 Correction for Bulking4.1.3 Correction for Bulking
In volume batching, suitable allowance shall be made for the bulking of fine aggregate
due to the presence of water. For this purpose the bulking shall be determined as
directed by the Engineer conforming to standard methods.
4.2 Transporting and Placing of Concrete4.2 Transporting and Placing of Concrete4.2 Transporting and Placing of Concrete4.2 Transporting and Placing of Concrete
The concrete shall be mixed in quantities required for immediate use and shall be
deposited on the sub grade or sub-base to the required depth and width of the
pavement section, in successive batches and in continuous operation without the use
of intermediate forms sor bulkheads between joints. Care shall be taken to see that no
segregation of materials results whilst the concrete is being transported from the mixer
to the place where it is deposited. The usual method of transport of concrete in India is
in pans as head loads or in small wheel barrows. The spreading shall be as uniform as
possible to avoid re handling of the concrete. Where however a certain amount of
redistribution is necessary, it shall be done with shovels and not with rakes. While being
placed, the concrete shall be rodded with suitable tools so that the formation of voids or
honeycomb pockets are prevented. The concrete shall be particularly well placed and
tapped against the forms and along all joints. As an alternative, an internal vibrator may
be employed in lieu of rodding of the concrete. Any portion of the batch of concrete that
becomes segregated in depositing it on sub grade shall be thoroughly mixed with the
main body of the batch during the process of spreading. In case of unavoidable
interruption a full depth transverse joint shall be placed at the point of stopping the work
provided the section on which the work has been suspended shall be at least 3.0 m
(10’) long. Shorter section shall be removed.
4.3 Placing of Load Transfer Devices 4.3 Placing of Load Transfer Devices 4.3 Placing of Load Transfer Devices 4.3 Placing of Load Transfer Devices –––– Dowels Dowels Dowels Dowels
Transverse expansion joints shall be equipped with dowels of the dimensions and at
the spacing and location indicated on the plans. They shall be firmly supported in place,
accurately aligned parallel to the sub grade and the centre line of the pavement by
means of dowel support which will remain in the pavement and will ensure that the
dowels are not displaced during construction. One half of each dowel shall be painted
and oiled and equipped with a tight fitting sleeve of the dimensions shown on the plans
to provide space for the dowels when pavement expands and the joint closes. This
sleeve shall be equipped with stop which will prevent it being pushed too far on the
dowel during construction. The sleeves are not required on dowels, if used, in dummy
construction or construction joints.
39
4.4 Water4.4 Water4.4 Water4.4 Water----proofing paperproofing paperproofing paperproofing paper
The water proofing paper, when necessary (see clause 5.2) shall be laid by unrolling
the roll) prior to the placement of concrete. The paper shall be unrolled with an overlap
of not less than 10 cm.
4.5 Compaction and Finishing4.5 Compaction and Finishing4.5 Compaction and Finishing4.5 Compaction and Finishing
4.5.1 Compaction4.5.1 Compaction4.5.1 Compaction4.5.1 Compaction
The surface of the pavement shall be compacted either by means of a power-driven
finishing machine or by a vibrating screed. For areas where the width of the slab is very
small as the corner of street junctions, etc. hand compaction and finishing may be
adopted subject to the approval of the Engineer-in-charge. In no case, however, hand
compaction shall be permitted for slab thickness beyond 10 cm. in the normal course.
All compaction and finishing shall be done in accordance with the following
requirements. Where hand tamping is permitted as a special case :
I) Concrete, as soon as placed, shall be struck of uniformly and screeded to the crown
and cross-section shown on the plans and to such level above the base that when
compacted and finished, the pavement shall conform to the grade and cross-section
indicated by the plans. The entire surface shall then be tamped and the tamping
operation continued until a close knit dense surface is obtained.
ii) The tamper shall rest on the side forms and shall be drawn ahead with a sawing
motion, in combination with a series of lifts and drops alternating with lateral shifts, the
aim of this operation being compaction and screeding to the approximate level
required. Subsequent temping should advance about 75 mm (3”) at a time in the
direction in which the work is proceeding, and in the final stages tamping should be
closer, about 12 mm (1/2”) at a time until a level and dense surface is obtained. Other
Cases
iii) Hand-operated vibrating screed consisting of a normal type of hand tamper to which
are attached pneumatic or electric vibrating units shall be used for compaction. It shall
rest on side forms. Such screed when used shall be lowered vertically on to the
concrete surface, evenly spread to the required level above the base, making due
allowance for compaction , allowed to remain in position for a few seconds until
compaction is complete, then lifted vertically and lowered on the adjacent strip of
uncompacted concrete. The screed shall again be taken slowly over the surface
sliding, with its axis slightly tilted away from the direction of sliding and the operation
repeated until the required dense, close knit textured surface is obtained. Compaction
of concrete slabs upto 12.5 cm. (5”) thickness may be done by means of vibrating
screed alone, while for thicknesses greater than 12.5 cm (5”) thickness, internal
vibrators and vibrating screeds shall be used with advantage for compacting the slab
corners and edges. The working of the vibrators shall be regularly checked and
standbyes shall always be maintained for emergency use.
iv) Segregated particles of coarse aggregate which collect in front of the tamper of
screed shall be thrown outside the forms or thoroughly mixed by hand with the mass of
concrete already on the base. Under no circumstances shall such segregated particles
be carried forward and pushed on to the base in front of the mass.
v) Compaction by tamping or screeding shall be carried on till the mortar in the mix just
works upto the surface. Care shall be exercised and the operation of tamping so
controlled as to prevent an excess of mortar and water from being worked on to the
top. Repeated operation other than to secure the necessary compaction and to
eliminate voids shall be avoided.
vi) Immediately after the tamping or screeding has been completed and before the
concrete has hardened, i.e. while the concrete is still in a plastic stage, the surface shall
be inspected for irregularities with a profile checking template and any needed
40
correction made by adding or removing concrete followed by further compaction and
finishing.
4.5.2 Floating4.5.2 Floating4.5.2 Floating4.5.2 Floating
As soon as practicable after the concrete has been struck off and compacted it shall be
further smoothened and compacted by means of a longitudinal float 1,200 mm. (4 ft.)
long and 75 mm (3:) wide, operated from a foot bridge. The longitudinal float shall be
worked with a sawing motion, while held in a floating position parallel to the
carriageway centre line and passed gradually from one side of the pavement to the
other. Movements ahead along the centre line of the carriageway shall be in
successive advance of not more that one half the length of the float.
4.5.3 Straight4.5.3 Straight4.5.3 Straight4.5.3 Straight----edgingedgingedgingedging
After the longitudinal floating has been completed and excess water has disappeared,
but while the concrete is still plastic, the slab surface shall be tested for trueness with a
3.0 m (10’) straight edge swung from handles 1m (3’) longer than one-half width of the
slab. The straight edge shall be held in successive positions parallel to the road central
line in contact with the surface and the whole area gone over from one side of the slab
to the other. Advance along the road shall be in successive stages of not more than
one-half length of the straight edge. Any depressions found shall be filled immediately
with freshly mixed, concrete, struck compacted and refinished. High areas shall be cut
down and refinished. The straight edging and refloating shall continue until the entire
surface is found to be free from observable departures from the straight edge and the
slab has the required grade and camber. The slab surface shall be retested for
trueness, before the concrete begins to set, with the 3.0 m (10’) straight edge and the
wedge gauge. The straight edge shall be placed on the surface, in successive
positions, parallel to the carriageway centre line. Irregularities shall be measured with
the help of the wedge moved transversely at
various points until it touches both the straight edge and the concrete surface. At any
point tested, the concrete shall not show a departure from the true surface, greater than
3 mm (1/8”) If at any place, the tolerance is greater than this, not more than 3 phases of
the vibrating machine shall be allowed and the surface tested again in the specified
manner. If the irregularity still exceeds the limit aforesaid, the concrete shall be
removed to a depth of 50 mm (2”) or to the level of the top surface of the
reinforcement, if any. The area to be removed shall be that represented by the length of
the straight edge in the position of measurement across the full width of the slab.
Where the point of measurement in default is less than 4.5 m (15’) from the transverse
expansion joint, the whole area up to the joint shall be removed to the required depth.
The concrete so removed shall not be re-used in the carriageway. Fresh concrete shall
be placed, compacted and finished in the manner already described in these
specifications and shall again be subjected to test for accuracy finish. The foregoing
procedure shall be adopted at each shifting of the straight edge and the whole area
shall be gone over from one side of the slab to the other. The straight edge shall
advance longitudinally in successive stages of not more than one-half of the length of
the straight edge. No extra payment shall be made for the removal of the rejected
concrete and for laying fresh concrete. Although the concrete may be removed
immediately following measurement of the irregularity and while it is still wet, this shall
not mean any waiver from complying with the requirements of this clause, if for any
reason the concrete to be removed has hardened ..After straight edging of the surface,
it shall be finished by belting or brooming or by the combination of both. In the manner
described in the following paragraphs.
4.5.4 Belting4.5.4 Belting4.5.4 Belting4.5.4 Belting
41
Just before the concrete becomes non-plastic, the surface shall be belted with a two
ply canvas belt not less than 200 mm (8”) wide and at least 1.0m (3’) longer than the
width of the slab. Hand belts shall have suitable handles to permit controlled uniform
manipulation. The belt shall be operated with short strokes transverse to the
carriageway centre line and with a rapid advance parallel to the centre line.
4.5.5 Brooming4.5.5 Brooming4.5.5 Brooming4.5.5 Brooming
After belting and as soon as surplus water, if any, has risen to the surface, the
pavement shall be given a broom finish with an approved steel or fibre broom not less
than 450 mm (18”) wide. The broom shall be pulled gently over the surface of the
pavement from edge to edge. Adjacent strokes shall be slightly overlapped. Brooming
shall be perpendicular to the centre line of the pavement and so executed that the
corrugations thus produced will be uniform in character and width, and not more than
1.5 mm (1/16”) deep. Brooming shall be completed before the concrete reaches such
a stage that the surface is likely to be torn or unduly roughened by the operation. The
broomed surface shall be free from porous or rough spots, irregularities, depressions,
and small pockets, such as may be caused by accidentally disturbing particles of
coarse aggregate embedded near the surface.
4.5.6 Edging4.5.6 Edging4.5.6 Edging4.5.6 Edging
After belting and /or brooming have been completed, but before the concrete has
taken its initial set the edges of the slab shall be carefully finished with an edger of 6
mm (1/4”) radius, and the pavement edge shall be left smooth and true to line.
4.6 Curing of Concrete4.6 Curing of Concrete4.6 Curing of Concrete4.6 Curing of Concrete
Immediately after finishing operations have been completed, the entire surface of the
newly laid concrete shall be covered against rapid drying and cured in accordance with
the following methods. Failure to provide sufficient cover material of whatever kind
required, or inadequate supplies of water to take care of both curing and other
requirements shall be adequate cause for immediate suspension of concreting
operations.
4.6.1 Initial Curing4.6.1 Initial Curing4.6.1 Initial Curing4.6.1 Initial Curing
Immediately after completion of the finishing operations, the surface of the pavement
shall be entirely covered with wetted burlap, cotton or jute mats. The mats used shall
be such length (or width) that as laid they will extend at least 450 mm (18”) beyond the
edges of the slab. The mates shall be placed so that the entire surface and both edges
of the slab are completely covered. This covering shall be placed as soon as, in the
judgement of the Engineer, the concrete has set sufficiently to prevent marring of the
surface. Prior to being placed the mats shall be thoroughly saturated with water and
shall be placed with the wettest side down. The mats shall so placed and
weighed down as to cause them to remain in intimate contact with the surface covered
and the covering shall be maintained fully wetted and in position for 24 hours after the
concrete has been placed or until the concrete is sufficiently hard to be walked on
without suffering damage. Water shall be gently sprayed so as to avoid damage to the
fresh concrete. If it becomes necessary to remove a mat for any reason, the concrete
slab shall not be exposed for a period of more than half an hour. Worn burlap or burlap
with holes will not be permitted. Burlap reclaimed from previous use other than curing
concrete shall be thoroughly washed prior to use for curing purposes. If burlap is
finished in strips shall be laid to overlap at least 150 mm (6”).Burlap shall be placed
from suitable bridges. Walking on freshly laid concrete to facilitate placing burlap will
not be permitted.
42
4.6.2 Final Curing4.6.2 Final Curing4.6.2 Final Curing4.6.2 Final Curing
Upon the removal of the burlap the slab shall be thoroughly wetted and then cured by
one of the following methods of final curing.
a) Curing with Wet Earth : Exposed edges of the slab shall be banked with
substantial berm of earth. Upon the slab shall then be laid a system of
transverse and longitudinal dykes of clay about 50 mm. (2’) high immediately covered
with a blanket of sandy soil free from stones to prevent the drying up and cracking of
clay. The rest of the slab shall then be covered with sufficient sandy soil so as to
produce a blanket of earth not less than 37 cm. (1.5”) depth after wetting. The earth
covering shall be thoroughly wetted while it is being placed on the surface and again
with water for 14 days and thoroughly wetted down during the morning of the 15th day
and shall thereafter remain in place until the concrete has attained the required strength
and permission is given to open the pavement to traffic. If such permission is granted,
the covering shall be removed and the pavement cleaned and swept. If the earth
covering be displaced during the curing period, it shall be replaced to the original depth
and re-saturated.
b) Imprevious membrane method : The membrane shall consist of a practically
colourless imprevious liquid of a type approved by the Engineer. The use of any
membrane material which would impart a slippery surface to the pavement or alter its
natural colour will not be permitted. Liquid shall be applied under pressure with a spray
nozzle in such a manner as to cover the entire surface with a uniform film, and shall be
of such character that it will harden within 30 minutes after application. The amount of
liquid applied shall be ample to seal the surface of the pavement thoroughly. The liquid
shall be applied immediately after the finishing of the surface and before the set of the
cement has taken place, or, if the pavement is first covered with burlap, it may be
applied upon removal of burlap. The impervious coating used shall be such that when
applied to the surface of
mortar test slabs in the manner prescribed for the use of the materials in the field, the
mortar shall retain at least 90 per cent of the mixing water when exposed for 144 hours
to temperatures between 32 to 38 degree C. (90 degree F and 130 degree F) at a
relative humidity of 30 per cent to 50 per cent. The mortar test slab used shall be
composed of one part Portland Cement, 1.71 part fine aggregate and 0.346 parts of
water by weight. The slab shall be cast in non-absorbent watertight mould, and shall
remain in the mould throughout the test. The slab shall be approximately 380 mm. (15”)
long by 380 mm (15”) wide by 50 mm (2”) deep. The coating shall be applied to the
exposed surface of the slab within 2 hours of the time the slab is cast. Materials for use
as imprevious coatings will be approved by the Engineer on the basis of tests outlined
above. The rate of application of such coatings will be prescribed by the Engineer on
the basis of the same tests. This method of curing shall be carried out in locations
where there is scarcity of water and in what sections as directed by the Engineer-in-
charge.
4.7 Final Surface Test4.7 Final Surface Test4.7 Final Surface Test4.7 Final Surface Test
The final surface test shall be made after the curing period and after the removal of the
material used for curing. The surface shall be of correct alignment, grade and contour
specified. Any spots higher than 3 mm. (1/8”) and not higher than 6 mm (1/4”) above
the correct surfaced, as shown by 3.0m (10’) straight edge and the wedge in the
manner prescribed above, shall be ground down with an approved grinding tool to
the required level. When deviation exceeds the foregoing limits, the slab shall be
removed to full depth and replaced. The area of pavement to be removed and
43
replaced shall be that represented by the transverse joints, immediately adjacent to the
deviation, across the full width of the slab.
4.8 Removing Forms4.8 Removing Forms4.8 Removing Forms4.8 Removing Forms
Forms shall not be removed from freshly placed concrete until it has set at least 12
hours. They shall be carefully removed and in such a manner that no damage will be
done to the edge of the pavement. After the forms have been removed, the ends of all
joints shall be cleaned and the sides of the slab shall covered with earth to the level of
the top of the slab. All ditches and drains shall be so placed as to provide effective
drainage.
4.9 Concreting during Monsoon Months4.9 Concreting during Monsoon Months4.9 Concreting during Monsoon Months4.9 Concreting during Monsoon Months
When concrete is being placed during monsoon months and when it may be expected
to rain, sufficient supply of tarpaulins or other waterproof cloth shall be provided along
the line of the work. Any time when it rains all freshly laid concrete which has not been
covered for curing purposes shall be adequately protected by means of tarpaulins or
other waterproof cloth. Any concrete damaged by rain shall be removed and replaced.
4.10 Concreting in Hot Weather4.10 Concreting in Hot Weather4.10 Concreting in Hot Weather4.10 Concreting in Hot Weather
As placing of concrete at temperature above 40 degree C (140 degree F) is attended
with defects like loss of workability through accelerated setting, formation of plastic
shrinkage cracks, etc. It is recommended that unless adequate precautions as detailed
below were arranged, no concreting shall be done in temperatures exceeding 40
degree C. (140 degree F).
Aggregates, cement and water shall be protected from the direct sun, and mixing
operations shall also be carried out in shade. In addition portable shelters shall be
provided to protect the concrete during placing and finishing operations. This may be in
the form of frames to cover at least a length of 12.0 m (40’) of the roadway. The
surfaces of the forms and sub grade coming in contact shall be treated to prevent
absorption of mixing water. Since the setting time of concrete is considerably reduced
under such temperatures, reinforcements to labour shall be made to
minimise the time between mixing and placing of concrete. The protective cover shall
be adequate to exclude exposure of the concrete directly to the sun and also eliminate
contact with drying winds. Prior to removal of the portable shelters, the hardened
concrete shall be covered with wet hession followed by one of the usual methods of
curing like ponding, wet earth cover etc. In addition the moist curing period shall be
extended to a minimum of 2 to 3 weeks depending upon the temperature.
4.12 Work on Gradients4.12 Work on Gradients4.12 Work on Gradients4.12 Work on Gradients
The progress on gradient of all operations of placing, compacting and finishing of
concrete should proceed from the lower to the higher reaches. The concrete mix shall
be stiffer than used on level reaches.
4.13 Prot4.13 Prot4.13 Prot4.13 Protection of Concreteection of Concreteection of Concreteection of Concrete
Suitable barricades shall be erected and maintained and watchmen employed to
exclude traffic from the newly constructed pavement for the period herein prescribed
and these barriers shall be so arranged as not in any way to interfere with or impede
traffic or any lane intended to be kept open and necessary signs and lights shall be
maintained clearly indicating any lanes open to the public. Where as shown on the
plans or indicated in the special provisions, it is necessary to provide for traffic across
the pavement, suitable and substantial crossings to bridge over the concrete shall have
to be provided. Such crossings, as constructed, shall be adequate for the traffic and
satisfactory to the Engineer-in-charge. Any part of the pavement damaged by traffic or
44
other causes occurring prior to its final acceptance shall be repaired or replaced in a
matter satisfactory to the Engineer-in charge. The pavement shall be protected against
all traffic usage including that of construction traffic.
4.4.4.4.14 Sealing of Joints14 Sealing of Joints14 Sealing of Joints14 Sealing of Joints
After the curing period is over and before the pavement is opened to traffic, the
temporary seal or other intruded materials of all transverse expansion and contraction
joints shall be removed completely and the slots filled with the approved joint sealing
compound. The joint opening shall be throughly cleared of all foreign matter before the
sealing material is placed. If necessary, the foreign matter shall be blown out. All
contact faces of the joint shall be cleaned with a wire brush to remove
loose material and shall be surface-dried when the sealing compound is poured. The
edges of joints shall be printed with a thin bituminous paint which shall be allowed to
dry before the sealing compound is applied. The primer shall be applied with a brush.
The composition of the primer shall be as follows :-
Percentage by weight
I) 200-penetration bitumen 66 (Blended hot)
ii) Light Creosote Oil 14 (Blended hot or cold)
iii) Solvent Naptha 20 (Blended cold)
The bitumen shall be melted and fluxed with the oil when cold, solvent naptha shall be
added. Bituminous emulsions shall not be used as primers. Care Shall be taken to
ensure that the sealing compound is not heated above 200 degree C (392 degree F)
and the temperature does not exceed 180 degree C (356 degree F) for long periods (or
other temperatures specified by the manufacturer of the compound).
Sealing compound shall be poured into the joint opening in such a manner that the
material will not be spilled on the exposed surface of the concrete. Any excess filler on
the surface of the concrete pavement shall be removed immediately and the pavement
surface cleaned. When required to prevent tackiness or pick up under traffic, the
exposed surfaces of the sealing compound shall be dusted with hydrated lime. Other
methods of
preventing pick up under traffic may be used when approved by the Engineer.
4.15 Opening to Traffic4.15 Opening to Traffic4.15 Opening to Traffic4.15 Opening to Traffic
Traffic shall be excluded from the newly constructed pavement for a period of 28 days
where ordinary Portland Cement, Portland Blast Furnace Slag Cement and Portland
Pozzoland Cement are used or for a period of 7 days where rapid hardening cement is
used. In all cases before the pavement is opened to traffic it shall be cleaned and the
joints shall be filled and trimmed or topped out as required. The joint or line of
separation between adjacent strips or slabs of con crete, when the pavement is
constructed in lanes or strips shall be cleaned and filled with bituminous sealant as
prescribed.
SPECIAL DIRECTIONS TO THE TENDERERS FOR ROSPECIAL DIRECTIONS TO THE TENDERERS FOR ROSPECIAL DIRECTIONS TO THE TENDERERS FOR ROSPECIAL DIRECTIONS TO THE TENDERERS FOR ROAD WORKS.AD WORKS.AD WORKS.AD WORKS.
1. Except stated otherwise, specifications given in Sections 600 of “Specification for
Road and Bridge Works” - 3rd Revision (Ministry of Surface Transport), published by
Indian Roads Congress shall govern for the Cement concrete roads.
2. Contactor must have a laboratory at site at his cost for performing various tests at his
costs and the following machines and equipments at least shall be provided at site.
a) Crushing strength machine (for cube tests)
b) Apparatus for testing flexural tests of concrete
c) Aggregate testing machine
d) Set of sieves for finding fineness modulus and for aggregate grading.
e) Laboratory weighing balance
45
f) Aggregate drying equipment
g) Equipment for testing of silt content in sand
h) Aggregate impact value test machines
I) Other machines as required by the Engineer
All the test records shall be meticulously maintained in the site laboratory and made
available as and when required.
3. The concrete cubes shall be tested for seven and twenty eight days strength as and
when directed as a cross check or as directed. Contractor should possess adequate
CUBE MOULDS. No charges for such surprise checks will be paid.
4. Mix design of adequate strength as required and specified by the Engineer shall be
done by the Contractor and checked by the Engineer after every fresh lot of aggregates
is brought at site by the Contractors. For this purpose gradation analysis of coarse and
fine aggregate shall be performed and shall be maintained within prescribed limits. The
results shall be displayed on graph paper and meticulously preserved.
5. The mix design should confirm to one of the methods specified in SP/23/1982.
6. Tenderers must submit detailed account of the various concrete roads constructed
by them with controlled concrete in the past along with the cost of the work and the
years in which they were constructed.
7 . The joints should be cut by mechanical means within 24 to 48 hours after the road
slab is cast. Spacing of VATAS for CURING shall have to be done accordingly.
8 . Contractor’s Engineer should be qualified and experienced and well versed with
concrete mix design and he should be thoroughly acquainted with the construction of
concrete roads.
9 . Plate vibrators should be used for compaction of concrete mix in addition to needle
and screed vibrators and as such contractors should have sufficient equipments of
minimum two numbers of each machine such as mixers, plate vibrators, needle
vibrators, screed vibrators and one extra number of each as stand by, for each site of
work.
10. In case the cube test for 28 days period fails, Core Test of the concrete slab at the
risk and cost of Contractors will be taken of upto 15 cm. dia cores for requisite depth as
per IRC Code No. SP-11 of 1988 immediately and if it fails, no payment will be made till
expiry of maintenance period and repair measures will be carried out by the
Contractors to the satisfaction of the Engineer at his cost.
11. The distance between bottom concrete layer and top layer during concreting
operation shall not exceed 2.5 meters, or 20 minutes whichever is lesser so as not to
have cold joint.
12. The apparatus for keeping the dowel bars in straight and perpendicular conditions
to the concrete cross sectional surface shall be provided and used to give the
alignment as directed by the Engineer, by providing additional bulkhead at a specified
distance. The bars should be straightened exactly perpendicular to finished concrete
surface by means of adequate device to be approved by the Engineer.
13. Dowel bars should be painted with bitumen and wrapped with water proof paper
and provided with expansion cap with glass wool backing as directed by the Engineer.
14. The concrete road panels must be in proper cross profile as per camber prescribed
by the Engineer.
15. Whenever the needle vibrator is used in vertical or horizontal position the mason
must follow with a trowel and punch frequently the portions of concrete from where the
needle vibrator is withdrawn so as to ensure that no hollow portion remains in the stiff
mass of concrete, plate vibrating shall also follow thereafter.
16. The machine cut joints and expansion joints must be air blown with forceful air jet
so as to blow out complete dust, sand particles and foreign matter from the slots of the
joints, before filling these with the filler material.
17. Necessary traffic signs and boards including provision of traffic cones, etc. for traffic
diversion, closure of road, road work in progress, etc. as directed by the Engineer shall
be provided by the Contractors at their cost.
46
18. Contractors shall go through I.R.C. - 43-1972 “Recommended practice for Tools,
Equipments and appliances for concrete pavement construction” and I.R.C.-15-1981
for their guidance in executing concrete road works. They will have to abide by these
specifications.
19. The dressing of joints should be maintained through out Guarantee period of the
work.
20. Sand shall be of approved quality of fineness modulus between 2.4 to 3. In case of
coarse sand the same will have to be screened and washed to reduce the silt content
to the level of less than 4% by weight and bring it within the range of fineness modulus
referred to above. Blending of sand of fine and coarse quality may be permitted if it is
found to give desired qualities referred to above. In case stone dust is required to be
used for mixing up with the sand for bringing the admixture within the desired range of
fineness modulus, such stone dust shall be of approved quality with fines passing
through 75 micron sieve limited to 15% or less. In case percentage of fines in stone
dust is found to be more than 15% prescribed under I.S. Code 383 of 1970 the same
will have to be washed and screened so as to bring it within the range of approved
quality stone dust. The fine aggregate will be tested and retested as directed by the
Engineer, till it satisfies required norms as per I.S.I. and as per specifications referred to
above.
47
Specification for Tri mix flooring :
(1) LEVELING OF SUB-BASE:
The P.C.C. floor bedding should be in required level/slope with top surface even to get the uniform thickness of R.C.C. floor within variation of 3% to 5%.
(2) CLEANING THE SUB-BASE:
Any debris/mortar/concrete above the P.C.C. floor bedding to be cleaned
before fixing of side forms for laying concrete floor.
(3) FORM WORK FOR PANELS:
Side forms for panels should be 15 to 20 mm less than thickness of floor.
- The side form will be of ISMC or fabricated with two ISA and MS
flats of required length to get required height. The side form
should be in perfect alignment, slots in ISMC to be provided for
passing the M.S. dowel bars to be provided at the longitudinal
joints. The top level of form work to be perfectly checked before
starting concreting for floor.
- 10 mm thick expanded polyethylene foam to be fixed at junction of floor
and wall and around all rigid structures such as columns, and machine
foundation walls for isolation of floor from rigid structures.
(4) LOCATION OF JOINTS IN R.C.C. FLOOR AT PLINTH LEVEL :
(a) Isolation Joints : (From rigid Structures)
The floor must be separated structurally from other building elements to
accommodate differential horizontal and vertical movement, 10 mm
thick. Isolation joints must be provided at junctions of wall, columns,
machine foundations etc. using 10 mm thick Expanded Polyethylene
having height equal to thickness of floor.
(b) Control Joints : (For Controlling Shrinkage Cracks)
Differential movement in the place of floor is caused due to drying
shrinkage, thermal changes and carbonation shrinkage. The first is
usually the most important.
Some shrinkage is expected and can be tolerated.
This amount will depend on the design and exposure of the particular
structural elements. However when this amount approaches to un-
tolerable limit, proportioning, mixing and selection of material deserves
careful alteration. In floor, shrinkage occurs more rapidly at the exposed
surface and causes upward curling at the edges. If the floor is restrained
48
from curling, cracking will occur wherever restrained portion develops
stress greater than the tensile strength of RCC floor.
Differential movement must be accommodated by control joints spaced
at 4.5 M to 7.50Mt. intervals in both directions. The shorter intervals can
also be used. Whenever there is reason to expect shrinkage to be high,
temperature steel may be used to restrict crack width.
For transverse joints 6 mm Plain Asbestos Cement Sheet or LPVC sheets
having depth up to 2/3 of floor thickness to be fixed before laying
concrete for floor. These are fixed simultaneously along with the fixing
of form work on the previous day so that it will not be disturbed during
concreting. This will help to avoid cracks due to thermal expansion /
contraction and also due to drying shrinkage. After the curing work is
completed these joints are to be filled with Polysulphide. Epoxy mortar
having proportion of one part Poly-sulphide Epoxy and two parts silica
quarts.
(5) TRANSPORTING AND PLACING OF CONCRETE :
The concrete shall be mixed in quantities required for immediate use and
shall be deposited on the sub-grade/sub-base to the required depth and
width of the pavement section in successive batches and in continuous
operation without the use of intermediate form between the joints Care shall
be taken to see that no segregation of materials, results whilst the concrete
is being transported from the mixer to the place where it is to be deposited.
The spreading shall be as uniform as possible to avoid re-handling of
concrete. Where however a certain amount of redistribution is necessary, it
shall be done with shovels and not with the rakes.
While being placed the concrete should be roded with suitable tools so that
formation of voids or honey comb pockets is prevented. The concrete shall
be well placed and tamped against the forms and along all joints.
(6) COMPACTION OF FLOOR CONCRETE :
The concrete at the side of the forms and between the M.S. reinforcements
at joints and at corners to be compacted with internal vibrator (needle
vibrators) to avoid honey combing and to get perfect compaction at these
locations.
The screed vibrator shall rest on side forms and it shall be placed on the
concrete surface, (evenly spread to the appropriate level above the base) to
provide the required surcharge for compaction; allowed to remain in
position for few seconds until compaction is completed,; then lifted
vertically and placed on to the adjacent strip of un-compacted concrete. The
amptitude of vibration of the screed shall not be less than 1.50 mm and
speed of travel not more than 0.60 mt. per minute. The screed shall again be
taken slowly over the surface, sliding with its axis slightly fitted away from
49
the direction of sliding and operation repeated until the required dense,
close, knit textured finish surface is obtained.
N.B. : Precautionary measures to be taken before commencing the
concreting work.
(a) The working of vibrators shall be regularly checked and standbys shall
always be maintained for emergency use.
(b) The segregated particles of coarse aggregates which collect in front of
the tamper or screed shall be thrown outside the forms. Under no
circumstances shall such segregated particles be carried forward and pushed
on to the base in front of the mass.
(7) FINISHING OF CONCRETE FLOOR :
Immediately after completing the compaction by screed vibrator and excess
water has disappeared but while the concrete is still plastic, the floor top
surface shall be tested for true-ness with a 3.65 M. long straight edge
(Aluminium Box Section).
The straight edge shall be held in successive positions parallel to the guide
channels in contract with top surface of floor laid and the whole area gone
over from the one side of the floor to the other. Advance along the floor
shall be in successive stages of not more than one half length of straight
edge. Any area of the depressions found shall be scooped to a depth of 4 to
5 cms., filled immediately with freshly mixed concrete, struck, compacted
and refinished. High areas shall be cut down and refinished. The straight
edging and re-floating shall continue until the entire surface is found to be
free from observable departures from straight edge and top surface has the
required leveled surface.
The floor top surface shall be re-tested for trueness before the concrete
begins to set with the 3.65 M. long master straight edge (Aluminium Box
Patti). Any irregularity in surface to be rectified.
(8) USE OF FLOOR HARDNER (FIRST DRY SHAKE):
Scrap the concrete deposited if any on the top of side form during
concreting. As soon as concrete is firm enough to support the weight of
workmen and their equipment and no water is observed on surface; apply
first shake of hardner evenly using 2/3 of total mix i.e. 2/3 of 7.5 kg/sq.mt.
Treat areas adjacent to walls and columns first, spread the materials evenly
by sprinkling at right angles in two passes close to floor level. DO not broad
cast from a station position but use a wooden scraper to spread the hand
broad cast.
(9) FLOATING : (with finishing machine having DISC)
50
Power float the sahke application promptly, work near wall, columns and
door area first. Avoid excessive floating but ensure that the sahke
application is completely wetted and incorporated in to the base slab.
(10) USE OF FLOOR HARDNER – SECOND DRY SHAKE :
Start immediately after first floating, spreading of balance material (1/3
quantity) of hardner and follow immediately second power floating.
Third power floating if required to be carried out for getting required
compaction. DO not add additional water during finishing with floating
machine.
(11) TROWELLING : (with finishing machine having BLADES)
For the first trowelling, the trowel blade must be kept as flat against the
surface as possible. If trowel blade is tilted or pitched at too great an angle it
is objectionable. The smoothness of the surface can be improved by timely
additional trowelling. There should be taps of time between successive
trowellings to permit concrete to become hardner. The purpose of additional
trowelling is to increase the compaction of fines at the surface. This gives
greater density and wear resistance.
(12) CURING :
After completion of the finishing operations, the surface of floor shall be
entirely covered with wet hessian cloth, barlap or jute mats. :The coverings
used shall be of such length (or width) that when laid will extend at least
500 mm beyond the edges of the floor slab and shall be so placed that entire
surface and both the edges of the slab are completely covered. They shall be
maintained fully wett and in position for 24 hours after the concrete has
been placed or until the concrete is sufficiently hard, to walk up on without
damaging the floor. To maintain the covering wet, water shall be gently
sprayed so as to avoid damage to the fresh concrete. If it becomes necessary
to remove the coverings for any reason, the concrete slab shall not be kept
exposed for a period of more than half an hour.
Final curing shall be done by ponding the water on floor by cement sand
mortar for 14 days.
(13) REMOVAL OF FORMS :
Forms shall not be removed from freshly placed concrete until it has set or
at least 12 hours whichever is later. They shall be carefully removed in such
a manner that no damage is done to the edges of floor. See that the dowels
provided in floor panel are not disturbed while removing the floor channel.
PROCEDURE FOR CHECKING SURFACE REGULATING USING A
STRAIGHT – EDGE :
The procedure to be followed for checking the surface regularity with a straightedge
is as follows.
51
(i) The 3-metre straight-edge may be made of steel or seasoned hard wood when
made of wood, it may be 75 mm wide and 125 mm deep and its test face
should perfectly straight and free from warps, rots of defects of any kind.
(ii) Periodically, the straightedge should be checked for its trueness with a string or
a metallic master straightedge. The straightedge should be rectified / replaces
as soon as the same has lost its trueness.
(iii) The depressions under the straight-edge are to be measured with a graduated
wedge. The wedge should preferably be metallic but may alternatively be of
seasoned hard wood. These should be graduated to read undulation up to 25
mm with a least count of at least 3mm.
(iv) For recording undulation in the longitudinal profile the straightedge is to be
placed longitudinally parallel to the centerline of the floor panel. Measurement
along two parallel lines may normally be sufficient for a single lane pavement
and along three lines for the two-lane pavement. One additional line may be
covered for each additional lane.
(v) The straightedge has limitations as regards the measurement of undulation at
vertical curves. Additional templates may be made for this purpose especially
if the curves are sharp.
(vi) The straightedge may be places at the starting point, wedge inserted
between it and the test surface where the gap is maximum and reading taken.
The edge may then be slided forward by forward but may be moved backward
and forward to record the maximum undulation existing at a location.
Locations with undulations in excess of the specified magnitude should be
marked on the surface.
(vii) A team of three persons consisting of two workmen and a supervisor and
equipped with one straightedge and two graduated wedges would be required.
The two workmen will operate the straightedge while the supervisor will take
measurements with the wedges and do the marking on the surface.
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