14201 Concrete Chanels for Floors and Slabs

8/3/2019 14201 Concrete Chanels for Floors and Slabs

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IS 14201 : 1994

Indian StandardPRECASTRElNFORCEDCONCRETECHANNEL

UNITSFORCONSTRUCTIONOFFLOORSAND ROOFS- SPECIFICATION

UDC 691.328-413 : 692.41,5

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002November 1994 Price Gronp 4


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Housing Sectional Committee, CED 51

FOREWORDThis Indian Standard was adopted by the Bureau of Indian Standards, after the draft finalized by theHousing Sectional Committee had been approved by the Civil Engineering Division Council.Considerable shortage of houses in the country, which is also increasing continuously, has led toincreasing stress being laid in the development programmes of Central and State governments, onfacilitating speedy and economical construction of houses. Problem of housing being gravest amongstthe lower income groups, both rural and urban, the greatest stress is being laid on housing for thesetarget groups.This calls for development and standardization of new building materials and construction techniqueswhich are simple and economical, commensurate with structural and hygienic safety and durability, inorder to ensure speedy and economical construction.This standard is one of a series of standards being processed by BIS on new materials and techniques ofroof/floor construction which, when implemented, are likely to result in substantial savings in materialsand cost of construction, in addition to achieving speedy construction. The other standards in the seriesare:

a) Prefabricated brick panel and partially precast concrete joist for flooring and roofing -Specificationb) Design and construction of roofs and floors with prefabricated brick panel - Code ofpracticec) Design and constructiqn of floor and roof with precast reinforced channel units - Code ofpracticed) Precast reinforced concrete planks and joist for flooring and roofing - Specificatione) Design and construction of floor and roof with precast reinforced concrete planks and joist -Code of practicef) Precast reinforced concrete L-panel for construction of roofs - Specificationg) Design and construction of roofs using precast reinforced concrete L-panel - Code of practiceh) Construction of walls with precast concrete stone masonry blocks - Code of practice

The reinforced concrete channel units are channel ( inverted trough ) shaped precast beams which canbe used for intermediate floors and roofs supported on walls or RCC beams. There shape ensures morearea of concrete in compression zone where it is required and less area on tension side and thus theyhave an efficient section. Further, being precast, use of these units also saves the cost of shuttering,ensures better quality control on concrete and speeds up construction work.The recommended width of the channel units has been selected keeping in view the requirements ofmodular co-ordination.Considerable assistance has been rendered in the preparation of this standard by the Central BuildingResearch Institute, Roorkee.The composition of the committee responsible for the formulation of this standard is given at Annex B.For the purpose of deciding whether a particular requirement of this standard is complied with, thefinal value, observed or calculated, expressing the result of a test or analysis, shall be rounded off inaccordance with IS 2 : 1960 Rules for rounding off numerical values ( revised ). The number ofsignificant places retained in the rounded off value should be the same as that of the specified value inthis standard.


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IS 14201 : 1994Indian Standard

PRECASTREINFORCEDCONCRETECHANNELUNITSFORCONSTRUCTIONOFFLOORS

ANDROOFS- SPECIFICATION1 SCOPEThis standard covers the requirements for precast rein-forced concrete channel units having a length of up to4.5 m used for construction of floors and roofs.2 REFERENCES2.1 The Indian Standards listed below are necessaryadjuncts to this standard:

IS No.432 ( Part 1) :1982

456: 19781786: 1985

490.5 : 196814215 : 1994

3 MATERIALS3.1 Concrete

TitleSpecification for mild steel andmedium tensile steel bars and hard-drawn steel wire for concrete reinfor-cement :Part 1 Mild steel and mediumtensile steel bars ( third revision )Code of practice for plain and rein-forced concrete ( third revision )Specification for high strengthdeformed steel bars and wires for con-crete reinforcement ( fhird revhim )Methods for random samplingCode of practice for design andconstruction of floors and roofswith precast reinforced concretechannel units

The concrete used for making precast units shallconform to grade M 15 or higher in accordance withIS 456 : 1978. Coarse aggregate used for making concreteshall be well graded with maximum size of 12 mm.3.2 ReinforcementThe reinforcing steel shall be as recommended inIS 456 : 1978.4 SHAPE AND DIMENSIONS4.1 Shape4.1.1 The precast units shall be chamlel (invertedtrough) shaped, having outer sides corrugated andgrooved at ends to provide shear key action and transferof moments between adjacent units (see Fig. 1 and 2).

4.1.2 Inner sides of the channel shall be kept sloping,as shown in Fig. 2 to simplify easy demoulding. Theslope may be kept between l/8 to l/16.4.2 Dimensions4.2.1 LengthLength of the channel unit shall vary according to roomdimensions, but the maximum length of the unit shallbe restricted to 4.5 m from stiffness considerations.4.2.2 WidthThe nominal width of channel unit shall be 300 or 600mm.4.2.3 DepthThe depth of the channel unit shall be kept either 130mm or 200 mm.4.2.4 Thickness of FlangeThe minimum thickness of flange shall be 30 mm for300 mm wide channel units and 35 mm for 600 mmwide channels.4.2.5 Thickness of Web (Legs of Channel Unit)The minimum thickness of the channel leg shall be notless than 25 mm.4.3 Tolerances on Dimensions43.1 Tolerances on various dimensions of channel shallbe as given below:

Dimension ToleranceLength 2 5 mmWidth 2 3 mmBow (deviation from intended f 3 mmline or plane)Twist (distance of any comer *3mmfrom the plrcne containing otherthree comers)

4.3.2 SquarenessWhen considering the squareness of the corner, thelonger of the two sides being checked shall be taken asthe base line. The shorter length shall not vary in lengthfrom the perpendicular by more than 3 mm.

FIG. 1 A CHANNELUNIT1
http://../link/31to60/432_1.Bishttp://../link/31to60/432_1.Bishttp://../link/31to60/456.Bishttp://../link/15to30/1786.Bishttp://../link/15to30/1786.Bishttp://../link/31to60/456.Bishttp://../link/31to60/432_1.Bis


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IS 14201 : 1994

1 5_ B

I-f: 55 XI-K30 _LO 30 _LO_ 30 -40 A-*0

-CORRUGATIONS-10mm PROJECTION

-FLAT PART

Q DEFORMEG BAR

+3mm 2 LEGGED M.S. WIRESTIRRUPS @ 300 Ck

SECTION AT BB,CORRUGATION 20 DIA 1

I- 2651565 4 1Omm PROJECTIONSc

FLAT PARTrPROJECTION 1Omm

SECTION AT A A I ELEVATION CFIG. 2 TyplcAL DETAINOF CHANNn UNIT

4.3.3 FlatnessThe maximum deviation from a 1.5 m straight edgeplaced in any position on a nominal plane surface shallnot exceed 2 mm.5 DESIGN DETAILS5.1 The channel units shall be designed in accordancewith IS 14215 : 1994.5.2 Reinforcement5.2.1 Main reinforcement of the chamiel units shallcomprise two bars of required diameter as per thedesign placed at the bottom of two legs of chatmel unit.Two bars of mild steel grade I conforming to IS 432(Part 1) : 1982,6 mm I$shall be provided at top cornersto support the stirrups (see Fig. 2). Stirrups of 3 mm Qat the rate of 300 mm c/c along the length of the chalmelunit (see Fig. 2) shall be provided.5.2.2 Cover to ReinforcementThe minii&l cover to reinforcement shall be 1.5 mm.6 MANUFACTURING OF PRECAST IJNITS6.1 tiould6.1.1 The mould consists of two parts - the outer frame

and the inner trough frame. Typical sketches showingdetails of various components of mould are given inFig. 3.6.1.2 The mould shall be made from well seasonedtimber or steel or other rigid, non-corrodible and non-absorbant materials such as fibre reinforced plastic. Incase timber mould is used for the inner trough frame,the surface shall be lined with GI sheet.6.1.3 Dimensions of the mould shall be selecteddepending upon the size of the channel units. Toleran-ces on mould shall be as given below:

Dimension Tolerance (mm)Length f 4 mmWidth and thickness *2mmWarp/Bow 2 2 mm

6.2 Manufacturing of Channel Units6.2.1 The inner side of the outer mould frame shall beapplied with a bond release agent and placed on asmooth and level concrete platform on which a bondrelease agent has been applied.6.2.2 The reinforcement cage shall be placed in posi-tion. It shall be eusured that the reinfcxcernent is not

2


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IS 14201 : 1994rNGLE IRON 40~40x5FIXED ON TROUGHMAX SPACING 1.2m c/crWDODEN STIFFENER LOmm THICK @ 600 mm c/c7!i]lOtj LLONGITUDINAL

1 150 +h

MEMBER, 50x130_) z L

TOP PLAN

q~lurnrn tu414 25PROJECTING NUT -BY 25 mm Q l-2 m ClC

---r

I3

WI 1200

_l_w50DETALL AT A

L75X5OX5Ml0 BOLT;j..,:,:.~.~:I.: i.::.:- :.: :;y 1. :q*.j

_(50(_-I , L SMOOTH LEVELISURFACED PLATFORMSECTION f3B

FIG.3 D~vurs OF MOIJIB FOR CHANNEL um

WOODEN END PIECEL50x130x50

CUT TO LS= SL OPESECTION AT AA f150/200

ND VIEW OF L ONG: SIDEOF MOULD

3


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: 1994in any way, during storage, handling, place-

shall be placed in the flange portionunit in such a way as to avoid segregation up toheight that it achieves a thickness equal to thethe unit after compaction. The concrete shallbe compacted with.a plate vibrator.frame, applied with a bond releaseouter surface (that is, the surface facingshall then be kept inside the outer frame andflange concrete shall be levelled by moving theto and fro. Afterwards the trough shall be fixedposition with outer frame.

web (leg) portion of the channel unit shallbe filled with concrete, compacted by vibrationa plate vibrator/needle vibrator and finished level.rame may be removed gently afterhour (depending upon the weather) after cast-The outer frame may also be stripped offafterabout(depending upon the weather) after casting.undisturbed for about 48 hoursthis period by occasionaling of water or by covering by wet gunny bags.

Curingabout 48 hours the units shall be turned upsideso that the flange is brought to the top. The unitstransported to curing yard by supportingstacked with the trough (flange)up. The units shall be cured for at least 12 dayskeeping the trough filled with water and furtherfor another 14 days before placing it inin a building.

All the precast reinforced concrete units of the samemanufactured from similar materials and underconditions of production shall be groupedto constitute a lot.Five units shall be selected at random out of a lot

g of 300 units or less. For lots bigger than 300units shall be selected for every 300 units or part. In order to ensure randomness of selection,given in IS 4905 : 1968 may be followed.The sample shall be marked for future identifica-

8 TESTSTests shall be conducted on samples of the units asgiven in Annex A.9 CRITERIA FOR CONFORMITY9.1 If four out of the five samples satisfy the dimen-sional requirements given in 4.2, the lot represented bythe sample shall be deemed to have passed the dimen-sional requirements. If more than one unit fails tosatisfy the dimensional requirements given in 4.2, thelot represented by the sample shall be rejected.9.2 In the deflection recovery test as per Annex A, ifthe deflection 24 hours after the removal of the imposedload is at least 75 percent of the deflection under theload for 24 hours, the unit shall be deemed to havepassed the test. If the deflection recovery is less than75 percent, the lot represented by the unit shall berejected.If the maximum deflection in mm shown during 24hours under load is less than 40 12/D, where 1 is theeffective span 1 in mm and D, the overall depth of thesection in mm, it is not necessary for the deflectionrecovery to be measured and the recovery provisionmentioned in this clause earlier will not apply.9.3 In the failure load test as per Annex A, the unit shallcarry a load at least equal to 1.33 times the charac-teristic load to pass the test. If the load at failure is lessthan twice the characteristic load, the lot represented bythe sample shall be rejected.10 MARKING10.1 Each channel units manufactured in accordancewith this specification shall legibly and indeliblymarked with the following:

a) Identification of the source of manufacture, andb) Month and year of manufacture.

10.2 BIS Certification MarkingThe components tnay also be marked with StandardMark.10.2.1 The use of Standard Mark is governed by theprovisions of Bureau of Indian Standards Act 1986 andthe Rules and Regulations made thereynder. The detailsof conditions under which a licence for the use of theStandard Mark may be granted to manufacturers orproducers may be obtained from the Bureau of IndianStandards.


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IS 14201 : 1994ANNEX.4

( lauses 8 and 9 >TESTS FOR PREECAST REINFORCED CONCRETE CHANNEL UNITS

A-l AGE OF TESTINGThe precast reinforced concrete channel units shall betested as soon as possible after expiry of 28 to 33 daysatier casting.A-2 DIMENSIONAL CONFORMITYFive samples of precast reinforced concrete channelunits selected in accordance with 7.2 shall be checkedfcr conformity with the shape and dimensional require-ments as, given in 4. Length of the units shall bemeasured with a steel tape at least 5 m long havinggraduation in mm. Other dimensions shall be measuredwith 1 m long steel scale having graduation in mm.A-3 DEFLECTION RECOVERY TESTA-3.1 One unit selected at random out of the unitswhich have satisfied dimensional requirement as per 4.2and 9.1 shall be subjected to deflection recovery test.The precast unit shall be simply supported with a bear-ing of 75 mm on either end of the unit over concretewalls with a 6 mm thick M.S. steel plate fried in levelat top of the wall as shown in Fig. 4. Design dead loadother than due to self weight of the unit shall be applieduniformly over the units through loading blocks or byother means. A dial gauge having a least count of 0.02mm or less and a range of 50 mm or more shall be fixedat midspan of the unit. The dial gauge shall be adjustedto indicate zero reading under self weight of the unitand applied dead load.

A-3.2 The unit shall be subjected to a uniformly dis-tributed load equal to 1.25 times the imposed load, that is,1.25 times the design live load applied through loadingblocks of concrete or steel. Alternatively, uniform loadcould be applied by hydraulic jacks through a self reactingGame and a set of beams to distribute the load. The loadshall be retained for 24 hours. After recording deflectionat the end of this period, the load shall be removed.A-3.3 Twenty four hours after removal of the load, thedeflection shall br ri.corded again.A-4 FAILURE LOAD TESTA-4.1 The unit, which has passed the deflectionrecovery test shall be subjected further to failure loadtest. Loading shall be done uniformly through loadingblocks or through hydraulic jacks and a set of beams todistribute the load. If loading is done through blocks,sufficient gap shall1 be provided between adjacent tiersof blocks to ensure that they do not touch each othereven at the final stages of loading, to prevent transferof load to supports of units through arch action.Loading shall preferably be done from an independentscaffold as a safety preca:ltion.A-4.2 The loading shall continue till the unit fails. if nofailure O~YUISby crushing for breaking of the unit, theload causing a deflectiw equal to 1 in 60 of clear span ofthr unit shall be considered as the failure load. To checkthat the limiting deflection is not exceeded, a steel markershall br iixed below the unit at midspan, leaving a gap o!1 i9 60 of &Bar apau h~fore the start ol the lest.

INSITU COW

All dimensions in millimetres.


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IS 14201 : 1994ANNEX B

( Foreword )COMMITTEE COMPOSITION

Housing Sectional Committee, CED 51

Chairmon RepresentingDR P S. A. SUNDAIWM

MembersMinistry of Urban Development, New Delhi

SHR~G. R. AMBWANISHRI AROMAR RAWPROFH. P. BAHARI

PRoF SUBIR SAHA ( A bemate )SH~UK. K. BHATNAWR

SHRI M. N. Jo~~t.n~~~(A~flernnte)&tar H. U. BIJLANI

Municipal Corporation of Delhi, DelhiThe Action Research Unit, New DelhiSchool of Planning and Architect, New Delhi

Housing and Urban Development Corporation, New Delhi

In penonal capacity (I, Sodhna Enclave, Pan&heel Pork, New Delhi110017)

Sttat S. N. CHA~~RIEECHIEF ARCHITWT

S~NIORARCI~IXCT (H & TP- I) ( Afternate )CHIEF ENGINEER,AUTHORITY

~cttim?c~, Amxotzm (Alternate )CHIEF ENGINEER D)

SUPERINTENDING NGINEER(D) (Alternate )ENGMEER MEMBER, DDASHR~Y. K. GARG

SHRI CHETAN VAIDYA ( Alternate )SHRI 0. P. GAR~AU

DR N. K. JAIN ( AIrernnte)SHR~T. N. GUPTASHRI HAR~INDER SIN~H

SHRI K. N. AFRAWAL( Alfcmate )DR K. S. JAGMH

DR 8. V VENKATARAMAKEDDY (Aftemote)SHIU N. N. JAVDEKAR

SHRI P. M. DE~HPANUE Akmzo~e )SHRl 1: P. KAUAPPAN

SttRt .I. BHWANESWAKAN Aliematr )Miss NINAKAYOOKStitu A. K;M. KAtUMSHRl K. K. S. KRISHNANCb. D. V. PAIISALGIKARSHRI R.UA SINGtI

Strut S. SELVANTHAN Alfernute )RR A. G. MADHAVA KAII

SW I. K. MANI ( Akmote)SHRJ I-. K. SAHA

SHRI K. K. MIITAI. ( AIremare )

Calcutta Municipal Corporation, CalcuttaCentral Public Works Department, New Delhi

Maharashtra Housing and Area Development Authority, Bombay

Central Public Works Department, New Delhi

Delhi Development Authority, New DelhiNational Housing Bank, New Delhi

National Council for Cement and Building Materials, New Delhi

Building Materials & Technology Promotion Council, New DelhiPublic Works Department, Government of Rajasthan, Jaipur

Centre for Application of Science and Technology to Kural Areas(ASTRA), Bangalore

CIDCO, Maharashtra

Tamil Nadu Slum Clearance Board, (;c\v~rnruent of Tamil Nadu. Ma&as

The Mud Village Society, New DelhtHousing Department, Government nfhlleghdlaya. Shilh~ugDepartment of Science & lechnology (USI), New Delhi6. G. Shirke & Co, PuneIR


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IS 14201 : 1994

( Continued from page 6 )

MembersSHRI . S. SHARMA

&RIB. B. GARG( Alternate)SHRI . VENKATARAMAN,Director (Civ Engg)

RepresentingCentral Building Research Institute (CSIR), Roorkee

Director General, BIS (Ex-officio Member )Member SecretarySHRI . K. PRAsAO

Joint Director (Civ Engg), BIS

Panel for Modular Coordination and Prefabricationfor Mass Scale Housing, CED 51 : P2Convener

SHRIT. N. GUPTAMembers

SHRIY. K. GARGSHRISLINIL ARRYAlternate )

SHIUM. N. JOGLEKARPROFV. P. R+xu

PROPP K. CHOUDHARY (Alternate )SHRI G. s. RAOREP~IZF~TATI~EDR A. G. MADHAVAAO

SHRIK. I&N, ( Alternate )SHIUS. ROYSHRIM. K~IND~Alternate)

SHRIJ. S. SHARMASHRIM. P. JA~~~NGHAlternate)

SUPERJNTENDINGNGINEERD)EXFCUTIVENGINEER(HQ)Alternate )

Ministry of Urban Development

National Housing Bank, New Delhi

Housing and Urban Development Corporation, New DelhiSchool of Planning & Architects, New Delhi

National Building Construction Corporation, New DelhiM/s B. G. Shirke & Co, PuneStructural Engineering Research Centre, Madras

Hindustan Prefab Ltd, New Delhi

Central Building Research Institute, Roorkee

Central Public Works Department, New Delhi


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Bureau of Indian StandardsBIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of thd activities of standardization, marking and qualit! certification of goodsand attending to connected matters in the country.CopyrightBIS has the copyright of all its publications. No part of these publications may be reproduced in anyform without the prior permission in writing of BIS. This does not preclude the free use, in the courseof implementing the standard, of necessary details, such as symbols and sizes, type or gradedesignations. Enquiries relating to copyright be addressed to the Director ( Publications ), BIS.Review of Indian StandardsAmendments are issued to standards as the need arises on the basis of comments. Standards are alsoreviewed periodically; a standard along with amendments IS reaffirmed when such review indicates thatno changes are needed ; if the review indicates that changes are needed, it is taken up for revision.Users of Indian Standards should ascertain that they are in possession of the latest amendments oredition.This Indian Standard has been developed from Dot No. CED 51 (5055)

Amendments Issued Since P ublication

Amend No. Date of Issue Text Affected

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Telegrams : Manaksanstha( Common to all offices )Telephone

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Documents

14201 Concrete Chanels for Floors and Slabs