-
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a
practical regime of right to information for citizens to secure
access to information under the control of public authorities, in
order to promote transparency and accountability in the working of
every public authority, and whereas the attached publication of the
Bureau of Indian Standards is of particular interest to the public,
particularly disadvantaged communities and those engaged in the
pursuit of education and knowledge, the attached public safety
standard is made available to promote the timely dissemination of
this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti
Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता
है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 10297 (1982): Code of practice for design andconstruction of
floors and roofs using precastreinforced/prestressed concrete
ribbed or cored slab unit[CED 51: Planning, Housing and
pre-fabricated construction]
-
IS : 10297-1982
Indian Standard Reaffirmed 2008
CODE OFPRACTICE FOR DESIGN AND CONSTRUCTION
OF FLOORS AND ROOFS USING PRECASTREINFORCED/PRESTRESSED
CONCRETE
RIBBED OR CORED SLAB UNITS
( First Reprint APRIL 2000 )
UDC 69.024/025: 691.327/.328-412 : 69.001.3
Copyright 1982
BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR
MARG
NEW DELHI 110001
Gr 4
©
1982
-
IS I 10297· 1982
Indian StandardCODE OF
PRACTICE FOR DESIGN AND CONSTRUCTIONOF FLOORS AND ROOFS USING
PRECAST
REINFORCED PRESTRESSED CONCRETERIBBED OR CORED SLAB UNITS
Prefabricated and Composite Construction Sectional Committee,
BDe 32
Repr,s,,,tingEngineering Construction Corporation, Madras
DB P. RAY CHAUDHRY
ChairmanSURI A. RAIIAKRISUANA
M""b,r,SUR) S. SUBRAMANIAN ( .,4lt,rnat, to
Shri A. Ramakrishana )ADDliJON.4L DIRECTClR (STAND- Railway
Doard ( Ministry of Railways)
ARD) RDSa, LUCXNOWSaRI ASHOX KllJrlAR ( ..4"""al, )
BRIO J. S. AULUW ALIA Ministry of Defence ( Engineer-in-Chief's
)LT-COL A. C. MOHAN ( Alt,rnal, )
SHIU C. R ALIKCHANDANJ STUP Consultants Ltd, BombayDR V. N. Gt1N
AJ l ( Alt""al,)
DBN. S. BBAL Structural Engineering Research Centre, RoorkeeSHRI
K. C. NAITlIANI ( Alternal, )
SHAI AJYA BBARDW A~ In personal capacit y ( 207 Golf Links, New
Delh, )SJU\J DAKSDA BBARDWAJ (.141'''''01')
SUBI S. C. CBAKBABARTI CEntral Building Research Insritute
(CSIR),Roorkce
Housing &. Urban Development Corporation, NewDelhi
Central Road Research Institute (CS1R») NewDelhi
SBBIB.K.CBAKBADORTY
SHllJ A. K. GABO ( AII,rna',)CBIEF AROHITBC'I' Central Public
Works Department, Nt:w Delhi
S, NIOR ARC HlTFCT ( M & TP) ( Alt,rratJt, )DJBFeTOR ( C
& MOD) Central "'ater Commission, New Dt'lhi
DJoPUTY DntECTOU ( C & MDD) (Alt,rnate)SHRI A. GB08BAL In pr
rsonal capacity (C/o Stup ConsultlllZt.s Ltd, 12
Darga" RODd, Calcutta )DR A. G. MADHAVA RAO Structural
Engineering Research Centre, Madra!'
SHRI G. ANNAKAL.AI (..4lt""al,)
( Contirw,J onP(J.~' 2 )
~ ~oR'" ar/" l ~ti2BUREAU OF INDIAN STANDARDS
Thil publication ia protected under the Ind,a" COfl.1';gh' .-4t'
(XIV or 1957) andreproduction iD whole or iD part by any me-ana
except with writtt·n permission of thepublisher shall b. deemed to
be an Infrinlemflot of copyrilht und.r th~ said Act.
-
18 I 10297 • 1982
( CMtUaud frtJmpa" 1 )
M""HrI R'/Jr,satu.,SRBI G. K. MAJUMDAR Hindustan Prefab Limited,
New Delhi
Ssal M. KUNDU ( .41",,,.,. )SJlRJ J S. M\TKt7B Hindustan Steel
Works Oon1truction Ltd. CalcuttaSSBI Y. K. MiI-I'l'A The Concrete
Association of India, Bombay
SaRI E. T. A!rru. ( ..41''''''', )SRBI P. V. N \I1C Hindustan
Construction Co Ltd, Bombay
SHRIA.C.NARWAXl(A.I",uu)SRBJ B. C. PATEL MIs M. N. Dastur at Co
Pvt Ltd, CalcuttaSRRI C. M. P ATaL Bihar Prestreeing PVt Ltd,
Bbalalpur ( Bihar)SaBI SUllnsa B. PATBL Shirish Patel &.
Associates, Bomoay
SURI P. H. SRlNlYA.8A.OBAB ( .tf.lt"nal, )DR V. PABAIIA81VAII
Indian Institute of Technologv, MadrasDR N. R \QR \ Y_DBA Cement
Research Institute of India, New DelhiPRO.. c. K. RAJI~B Indian
Institute of rechnology, BombaySHBI P. V. SHAH Sh:tb Construction
Co Ltd, Bombay
SaBT S. R. SlYASW AllY Gammon India Ltd, BombayS 'fBI A. K.
CtI.~'l'TBB"BB ( AlIn1l41, )
SHRI K. S. SIi,IJlIVASAJI National Buildings Organization, New
DelhiSRRI S UlfIL BRay ( AI,,,,,,,,, )
DR R. C. SONPAL The Instirurion of Engineen ( India ),
Calcutta81181 K. VSBRt\BO\GHAVA.OBA.B1 Dbarat Heavy Electricall
Ltd, VelloreSHBI G. V IUf'IC ~TIISULU Ministry of Shipping and
Transport, Naw Delhi
S ilBl S. S8IDT HABAX A:JI ( Alllrnal, )LT-COL R. G. W \8TBAD
Ministry or Defence ( R &. D )
SHBI D. K. MURTHY ( A.l,maau )SRBI G. R AMAR, Director General,
lSI ( E¥-oJieio Mmab" )
Director ( Civ EDB' )
S~
SRBI A. K. AVA8TRYAaiatant Director ( Civ Eoa ), lSI
PrefabJ9ication Systems Subcommittee, BDC 32 : 1
CO'IItJItWSBBI G. K. MAJt1IIDAB Hind".tan Prefab Limited, New
Delhi
MIrIIHrISBBI M. Ktnmt1 ( .41tmlllll to
Shri G. K. Majumdar)SBBI P. S. AlIs(J[. City and Induttri1,l
D~velopment CorporatioD 01
Mabarashtra Ltd, BombaySH'RI P. M. DMU-dD. ( .41,.",.,,)
SHBt E. T. A1fl'IA The Concrete Auociation or India, BombaySKRt
N. C. DUGGAL ( AI,,,.,,.,, )
SKBI A. BK,aADWAJ In penonat capacity ( 201Golf Liw. He
D11h1)SSRI S. N. CJlA.1fDA Metatlurgfeal & Engineerilll
Comultantl (India)
Ltd, RanchiSHBI PASWA'1'BY ( Jflm,"*)
( CMliauMl. /M,' If )2
-
AMENDMENT NO. 1 DECEMBER 2006TO
IS 10297 : 1981 CODE OF PRACTICE FOR DESIGNAND CONSTRUCTION OF
FLOORS AND ROOFSUSING PRECAST REINFORCEDIPRESTRESSEDCONCRETE RIBBED
OR CORED SLAB UNITS
(Page 3, clause 0.4) - Insert the following clause at the
end:
'o.s All standards, whether given herein above or cross-referred
to in the maintext of this standard, are subject to revision. The
parties to agreement based onthis standard are encouraged to
investigate the possibility of applying the mostrecent editions of
the standards. '
(Page 4, clause 2.1, Note) - Substitute the following for the
existing note:
'NOTESI The units with nominal width of minimum 300 rom may al80
be used in residentialbuildinp.2 A:I the aize ofthe alab panel
units depends on the handling equipment and the design
methodnotwithstandingthe size Bivenin 2.1, any other size may be
used. '
(Page 6, clause 4.4.3) - Insertthe following note after first
para:
'NOTE - For non-circular core sections, the top thickness d1
should be checked for localbendins·'
[Page 7, clause 6.1(a)] - Substitute 'IS nun' for ·12 mm' and
'20 mm' for'1' mm'.
(Page 9, clause 7.1) - Substitute the following for the existing
firstsentence:
"The concrete mix used shall be minimum of M20 gmde in
accordance withIS 456 : 2000 'Code of practice for plain and
reinforced concrete (fourthrevision)'. However for prestressed
concrete units, higher sttength grade ofconcrete is required in
accordance with IS 1343 : 1980 'Code of practice forprestressed
concrete(first revlslon)'.1t
1
-
Amead No. 1 to IS 10297 : 1982
(Page 11,clause 11.5) - Insert the followingat theend:
"However the provisions of IS 1893 (part 1) : 2002 'Criteria for
earthquakeresistant design of stnletures: Part 1 General provisions
and buildings C/iflhrevision) , and IS 4326 : 1993 'Code of
practice for earthquake resistant designand construction of
buildings (second revtsiont' for earthquake resistance
shallberequired to be taken careor."
(CED 51)
Repro....pby Unit,81S, New Delhi, India
2
-
IS : 10297 • 1982
Indian StandardCODE OF
PRACTICE FOR DESIGN AND CONSTRUCTIONOF FLOORS AND ROOFS USING
PRECAST
REINFORCEDJPRESTRESSED CONCRETERIBBED OR CORED SLAB UNITS
o. F 0 I~ E W 0 R D0.1 This Indian Standard was adopted by the
Irulian Standard" Institutionon 30 September 1982, after the draft
finalized by the Prclabricated andComposite Construction Sectional
Committee had been approved by theCivil Eng.neering Division
Council.
0.2 Precast ribbed slab units generally have a thin flange
stiffened bylongitudinal and/or transverse ribs. Cored slab units
are those precastpanels in which voids are created in manufacturing
process to reducethe crass section without appreciably decreasing
the stiffness or strength.These ribbed slabs as well as cored slabs
are generally lighter than thenormal cast in situ solio slabs or
beam and slab. Structurally advant-ageous sections like channels,
double tees, hollow core cross sections canbe used, effectinR
consic'erably decrease in dead load and resultant savingin
material. These units can be used for floors, roofs as well as for
wallpanels, in general building construction including residential,
public andindustrial buildings. These units can be advantageously
used for spansup to 9 metres in caseof reinforced concrete units
and up to 30 metresin case of prestressed concrete units.
0.3 In the formulation of this standard due weightage has been
given tointernational coordination among the standards and
practices prevailingin different countries in addition to relating
it to the practices in the fieldin this country.
0.4 For the purpose of deciding whether a particular requirement
of thisItandard is complied with, the final value, observed or
calculated, ex-pressing the result of a test or ana ysis, shall be
rounded off in accordancewith IS : 2·1~ 60•. The number
of~ignificant places retained in roundedoft'value should be the
lame as that of the specified value in this standard.---._--
·R.ul•• Cor roundiDg off numerical valuft ( ,.",uftl).
3
-
18 I 10297 • 1982
I. SCOPE
1.1 This standard covers the details of design and construction
of floorsan i roofs using precast reinforced and prestressed
concrete ribbed/coredslab units. This standard is intended to
supplement the requirementsfor design and construction already
covered by IS: 456·1978. andIS : 1343·1980f and other relevant
codes for reinforced/prestressedconcrete structures.
2. DETAILS OF PRECAST UNITS
2.1 De.I,D Dlme••loa. - The width of the ribbed units may be
amaximum of 3000 mm with ClOSS ribs and 2 100 mal for units
withoutcross ribs. For residential buildings the nominal width of
the unit maybe from 600 mm to I 200 mm in increments of 300 mm
chosen as perrelevant standards ani modular coordination. For
industrial and otherbuildings, however, the preferred nominal width
is 1 500 mm for channelunits and 2 100 mm for double tee units. For
the cored slab units thewidth shall be chosen taking into
consideration the aspects of modularcoordination as per relevant
codes up to a maximum width of 2 100 mm,The actual width of the
precast unit will however be slightly less to takeinto
consideration the tolerance in casting the units and also to
provideCor cast in sitll grouting at the joints.
NOT. - The unit! with nominal width or minimum .300 mm may also
be wed inrelidential buildin... .
2.2 The overall depth of the longitudinal ribs shall not be less
than 1/25of span for reinforced concrete units and 1/30 of span in
the case ofprestressed concrete units. It is, however, recommended
that deflectioncalculations in accordance with the relevant Indian
Standard code aremade to ensure that these serviceability
conditions are met ( s" IS : 456-J978· and IS : 1343-1980t ).
2.3 The minimum width of the rib shall not be less than 50 mm
forspans up to 5 m and 70 mm in the case of larger spans, The cross
sectionof the rib shall, however, have adequate slopes to
facilitate demouldingduring manufacture. Normally, the internal
slopes may be in the rangeof 1'15 to 1/8.
2.4 The minimum thickness of flange shall be 35 mm provided the
con-creting is done with proper mechanical vibration or by other
methods toachieve equivalent compaction assuming that the maximum
size ofaggregate shall be 12 mm. It is essential that the
reinforcement in theflange shall be provided in the form of a mesh
with spacing of bars/wiresnot exceeding those stipulated for slabs
in IS : 456-1978* subject to the
*Code or practice for plain and ...,inforced concret. ( thi,d
,,,,isiM).fCode of pracdce Cor pr.tr-.d concrete (fir" ,1ViSiM
).
4
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IS I 10297 • 1982
condition that the maximum unreinforced concrete area does not
exceed15,2 where t is the thickness of tile f'ange, In the thin
units ( of 35 mmthickness ot flange) the spacing may be a maximum
of 150 mm bothways.
3. MATERIALS
3.1 The materials used for the construction shall conform to IS
: 456-1978· and IS : 1343-1980t.
4. STRUCTURAL DESIGN
4.1 The precast units shall have adequate strength and stability
in accor-dance with the relevant code of practice ( IS : 456-1~78·
or IS : 1343-1~80t ) during the following stages:
a) Demoulding;b) Handling, stacking, transporting and placing;
andc) With all design loads together with dead load of in sit"
concrete
placed for connection purposes.
In situations where in situ concrete brings in monolithic
connectionand continuity it shall be designed according to IS :
3~35·1£66:.
NOT. - Where Portland pozzolana cement is wed delayed Itrenlth
developmeDtat the early .,es shall be considered.
4.2 Loads shall be in accordance with IS : 875-1S64§.
4.3 For calculating the limit state of collapse at the critical
cross sections,at Itage of demoulding and handling, a load factor
of at lealt 1 5 shallbe applied for calculating the design limit
state of collapse load.
The actual strength of the cross section at this stage can
either becalculated or proved through necessary tests.
4... meetlve I'IaDle Wldtb
4.4.1 &in.!or"tl Ctme,," Ribbed Slab Units - When the
thickness of flangei. more than 1/10 of overall depth of the rib,
the overall width of theflange i. effective in the compressive zone
and can be taken into constdera-tion in calculations for moment of
resistance of the cross sections In casethe thickness of flange is
less than 1/10 of the overall depth of the rib, theeffective RanKe
width can be taken as in T-~ectjon in accordance withIS :
456-1978*. Typical sketch of the channel unit and double tee unitis
shown in Fig. 1.
-Cod. or practice tor plaiD and reinforced concrete ( '/lirtl
,airit" ).tCode of practice ror prrltreaed concrete (first rmsi."
).*Code or practic.. for compoaitp conatructit D.ICode or practice
Cor Itructural sarety of buildinls: LoadiD. standards.
5
-
IS I 10297 • 1982
11. CHANNEL SLAB UNT
'8 DOUBLE TEE aAS UtlT
FlO. 1 RIBBED SLAB UNITS
t.4.2 P"'3"',lItl Coner,', Ribb,dSltJb U"itr - In the design of
prestressedribbed slabs, However, the entire flange should be taken
as effective for allcases and the T-beam formula should not be
applied as this may leadto underestimation of the prestressing
force required, if a lesser crosssection is assumed to be
effective.
4.4.3 RiinjiJrcid or P"slr,ss,tl Co"d Slab Units - The thickness
'tl' ofcored slab units shan be in accordance with 2.2. The
dimension 'tlltshan be at least I tl and 'tIs' shall be at least 1
d ( SI' Fig. 2) subject tominimum of 20 mm.
TOP
1d
------------I-----....IJBOTTOMFlO. 2 CORED SLAB UNIT
The smallest cross-section width excluding the hollow space,
bo ... b - ItJ, .haH be at lealt '1.:' unless a greater width i.
required forcontemplated shear stress.
6
-
IS I 1.7 • 1982
4.4.3.1 R~inforc,d or prestressed cored slab "nils - The
effective crosssection for design can be modified by adopting
equivalent rectangularlsquare instead of circular or elliptical
openings as given in Fig. 3.
5. MOULD
5.1 The mould used for manufacturing ribbed slabs normally
consist oftwo parts, (a) bottom mould, ani (b) side moulds. 'I he
bottom mouldcan be made out of timber, masonry, concrete, steel,
FRP, plastic 0" anyother material acceptable to engineer-in-charge.
The side mouldssimilarly can be of timber, steel, FRP, or plastic.
When using masonryor concrete moulds, the top surface shall be
finished to the requiredaccuracy ( se« Table 1 ) and made
smooth.
In case of masonry moulds, the use of chicken mesh or
fibrereinforcement in the top surface will help in making the mould
lastlonger for higher efficiency.
5.2 In the case of cored slabs, the voids can be created either
by anextrusion process, by inflated tubes, mild steel tubes,
timber, cardboardjhard paper or any other material.
5.3 The castellationsfdepressionsfroughening of required depth
shall beprovided in the sides of the precast units. Suitable
provisions in theside shutters of the DaU111d may create better
keying between in situconcrete and precast concrete units at the
joints.
6. REINFORCEMENT COVER
6.1 Minimum cover for the reinforcement for precast units shall
be as£0110\\'5:
a) For reinforcement in the flange, 12 mm clear in all
directions.This shall be increased to 15 mm when surfaces of
precastmembers are exposed to corrosive atmosphere; and
b) For main reinforcement in the rib, 20 mm or diameter of
barwhichever is greater. In case of corrosive atmosphere, thisshall
be increased to 25 mm, or diameter of bar, whichever isgreater.
6.2 It shall be ensured that the reinforcement cages are not in
any waydistorted during storage, handling, placement and casting.
In the caseof mass production in large precasting factories, the
use of reinforcementladders and mesh made by usin~ a
resistant-welding machine will beadvantageous for improving
production.
7
-
II I 10217 • 1982
_-1-
1-:.1o
8
-
18 I 10297 • 1982
7. CONCRETE
7.1 The concrete mix used shall be minimum of M-15 grade in
accor-dance with IS: 456·1978· but M-20 and above grade of concrete
iapreferred for reinforced concrete units and in accordance with
IS: 1343-1980t in the case of prestressed concrete units. The
maximum size oraggregate used shall be restricted to 12 mm in the
case of ribbed slabsand cored slabs with flange thickness less than
50 mm,
8. CASTING AND CURING OP UNITS
8.1 Mechanical vibration either through mould/table vibrators or
screedvibrators is essential to ensure good compaction. Needle
vibrators canbe used for compacting concrete in the ribs and screed
vibrators forcompacting concrete in the flange. For larger
factories, concrete placingmachine which level, vibrate and finish
the concrete units cain beadvantageously utilized for this
purpose.
8.2 Curing shall be done as per IS: 456..1978*. If necessary,
lowpressure steam curing may be provided to get early
stripping/releasestrength.
t. TOLERANCES
t.1 Tolerances of units shall be as follows.
9.1.1 Ungt" - ±5 mm or ±O·l percent, whichever is greater.
9.1.2 CrDss-S,etional Di",,1Uions - ±3 mm or ±O·l percent,
whichever isgreater.
9.1.3 Strai,hlnul of BDW - ±5 mm or 1/750 of the length,
whicheveris greater.
9.1.4 Squa"",ss - When considering the squareness of the corner.
thelonger of the two adjacent sides being checked shall be taken a.
the baseline. The shorter side shall not vary in length from the
perpendicularby more than 5 mm,
For the purpose of this requirement any error due to lack
ofstraightness shall be ignored; squareness shall be measured with
respectto the str'light lines which are mostly nearly parallel with
the featuresbeing checked when nominal angle is other than 90°, the
included anglebetween the check line. should be varied
accordingly.
·Code or practice CorplaiD and r~inrOl'Ced concrete (
,Ai,d",isi.. ).tcode 01 practice tor pr.tresaed concrete (psI
rlflisiOll ).
9
-
III 10297 • 1982
9.1.5 Twist - Any corner shall not be more than the tolerance
givenbelow from the plane containing the other three corners:
Up to 60 cm in width and 5 mmup to 6 mm in length
Over 60 em in width and 10 mmfor any length
9.1.6 Flatness - The maximum deviation from a 1·5-m strair ht
edgeplaced in any position on a nominal plane surface shall not
exceed 5 mm,
9.2 Tolerances of the mould are given in Table 1.
TABLE 1 TOLERANCES OF MOULDS( Cz'us,s 5.1 IIlId 9.2 )
LengthWidthHeightDiagonalWarp/Bow
(mm)
-10-0-s-o+3-0±S-O±3'O
9.3 Suitable erection tolerances shall be taken into account
while erectingthe precut unite,
10. SAMPLING AND TESTING OF UNITS
10.1 SampliD. - Sampling shall be done in accordance
withAppendixA.
10.2 Load Te.t
10.2.1 Load tests shall be carried out in accordance with IS:
4~61978-.
10.2.2 All the units passing the load test can be used in the
construc-tion.
10.3 After the load test, an optional test on the precast unit
up todestruction can be performed as agreed to between the supplier
and thepurchaser. This te!t is primarily intended to re-confirm the
load-factoractually available rJu-a-rJiI the design load.
-Code or practice lor plaiD and reinforced CODcrete ( ,lirl,.,1M
).
10
-
IS I 10297• 1982
11. TRANSPORTATION AND ERECTION OP PRECASTELEMENTS
11.1 Llrtla.l Book. - Wherever lifting hooks/holes are used
theseshall be provided at structurally advantageous points ( for
example, 1/5of the length from the end of the element ) to
facilitate demoulding anderection of the precast unit. The lifting
hooks can be formed out ofnormal mild steel reinforcing bars with
adequate carrying capacity tocarry the self weight during
demoulding, handling and erection. Aftererection, the hooks can
either be cut or bent down inside the screed orjoint concrete that
will be laid subsequently.
11.2 StackiD. of Units - After removal Crom moulds the
precastunits shall be stacked over supports placed at about 1/6 of
span Cromends. Care shall be taken to see that no support is placed
at the centreof span. Care also shall be taken to see that the main
reinforcement isalways at the bottom oC stacked units.
11.3 Traa.portatloa - The units shan be transported always with
themain reinforcement at the bottom. For transporting and erecting
theunits, rope slings shall be tied near the ends at 1/5 of the
length fromeither end of the unit. In case the units are
transported in trolleys, theover-hang of the units from the trolley
shall not be more than 1/5 of thelength. The unit shall be lifted
manually or with the help of chainpulley blocks or mechanically
with a hoist or a crane.
11.4 PlaciDl .ad AUpl.g - The units shall be placed and
alignedside by side across the span to be covered. While placing
the units, careshall be taken to see that they have the specified
bearing Oil supportingwall/beam. Placing of units shall be started
from one end of thebuilding.
11.5 Bearlal - The precast u~itl shall have a minimum bearing
of75 mm on the beams and 100 mm on the conventional masonry
waU.
11.5.1 If ribbed slab units without end diaphragm are used
overconventional masonry wall, concrete bed blocks shall be
providedbeneath the rib••
12. CURING OP IN SITU CONCRETE IN JOINTS
12.1 The ira sil" concrete in the joint shall be cured for at
least 7 days inaccordance with IS: 456·1978*. The concrete shall
then be allowed todry for at least a week. A coat of cement slurry
may be applied to tMjoints to fill the hairline cracks that might
have developed.
·Code of practicefor plaiD and reinforced concrete ( ,lairdmisi.
).
11
-
IS I 10297 • 1982
13. FIXTURES
13.1 Designers shall indicate provisions for fixtures like
fanhooksjinsertsjelectric conduits, etc, to be incorporated within
the precast units or thein situ joints/screed concrete,
13.1.1 In case of concealed wiring, conduits may be placed
within thejoints along the length or within the screed before
concreting, Ifadequate thickness is available this may be concealed
within the floorlroof finish.
13.1.2 Holes, openings and fixtures required to be provided
within theprecast units shall be fixed accurately with adequate
embeddment at theprecasting stage. Drilling of holes/cutting of
edges shall not be madeunless permitted by the engineer-in-charge
beforehand.
14. FLOOR FI~ISH
14.1 In case of floor slab, the floor finish shall be done as
per therelevant Indian Standard Code of practice. The Indian Patent
Stoneor mosaic flooring shall be layed in bays with the bay lines
in thedirection of the unit coinciding with any of the joints
between the units.
14.2 When the floor is made up of series of strips, mechanical
con-nections/screed concrete/overlapping reinforcement may be
provided toaccount for differential loading.
14.3 To provide adequate resistance against impacijacourtic
treatment,the floor thickness at any place shall not be less than
75 mm.
15. ROOF TREATMENT
15.1 Adequate waterproofing and thermal insulation to suit
localclimatic conditions shall be adopted in accordance with
relevant Inc..ianStandard Code of practice.
APPENDIX A(Clause 10.1 )
SAMPLING PROCEDURE FOR PRI:CAST SLAB UNITS
A-I. LOT
A-I.I AJI the precast slab units of the same sise, manufactured
from thesame materia) under similar conditions of production shall
be groupedtogether to constitute a lot.
12
-
IS I 10297 • 1982
A-l.2 The number of units to be selected from each lot for
dimensionalrequirements shall depend upon the size of the lot and
shall be inaccordance with coli and 2 of Table 2.
TABLE 2 SAMPLE SIZE AND REJECTION NUMBER
LOT SIZE FIRST SAID'LE SECOND FIRST REJEC- SECOND REJEC-SIZE
SAMPLE SIZE TION NUMBER TION NUMBER.
(1) (2) (3) (4) (5)
Up to 100 5 5 2 2101 to 300 8 8 2 2301 to 500 13 13 2 2501 and
above 20 20 3 4
A-l.2.1 The units shall be selected from the lot at random. In
orderto ensure the randomness of selection, procedure given in IS :
4905-1968*may be followed.
A-2. NUMBER OF TESTS AND CRITERIA FOR CONFORMITY
A-2.1 All the slab units selected at random in accordance with
coli and2 of Table 2 shall be subjected to the dimensional
requirements. A unitfailing to satisfy any of the dimensional
requirements shall be termed asdefective. The lot shall be
considered as conforming to the dimensionalrequirements if no
defective is found in the sample, and shall be rejectedjf the
number of defectives is greater than or equal to the first
rejectionnumber. If the number of defectives is less than the first
rejectionnumber the second sample of the same size as taken in the
first stageshall be selected from the lot at random and subjected
to the dimensionalrequirements, The number of defectives in the
first sample and thesecond sample shall be combined and if the
combined number ofdefectives is less than the second rejection
number, the lot shall beconsidered as conforming to the dimensional
requirements; otherwisenot.
A-2.2 The lot which has been found as satisfactory with respect
to thedimensional requirements shall then be tested for load test.
For thispurpose one unit shall be selected for every 300 units or
part thereof.'fhe lot shall be considered as conforming to the
requirement if all theunits meet the requirement; otherwise
not.
·MpthodCl Cor random ~ampling.
13
-
IS I 10297· 1982
( Continued from page 2 )
Al~nhen Repus'ntmf8HBI N. K. GUPT \ Engin~ers India Ltd,
NE'wDelhiSHBI P. C. JAIN Engineer·in-(~hief'sBranch, Army
Headquarters
M~J V. B. ARORA ( Alt,r"ate)SHRI MAJlENDRA RAJ Engineering
Consultants ( India ), NC'wDC'lhiSHRI G. M. MANDALI.\. Indian
Institute of Arrhu('C't" BombavSllKI S. NAHABOY Engineering
Construction Corporation Ltd, Madras
SHRI G. B. Srsnn ( Alternat, )SHRt A. NANOY Civengers Enterprise
Pvt Ltd, NC',v DelhiSHRI C. M. PATEL Bihar Prestressing Pvt Ltd,
BhagalpurDR N. RAGHAVENDRA Cement Research Institute of India, X(aw
D
-
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