IS 3370-1 (2009): Code of practice Concrete structures for ...

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3 \OAO BIS 2009 BUREAUOFINDIANSTANDARDSMANAKBHAVAN,9 BAHADURSHAHZAFARMARGNEW DELHIIt0002J,tI/(' 2009 PriceGroup7 CementandConcreteSectionalCommittee,CED 2 FOREWORDThisIndianStandard(FirstRevision )wasadoptedby theBureauofIndianStandards,after thedraftfinalizedbytheCementandConcreteS ectionalCommitteehad beenapprovedby the firstpublishedin been taken up with a view tokeepingabreastwith the rapiddevelopmentinthefield ofconstructiontechnologyandconcretedesig nandalsoto thestorageofliquidsareinfluencedby theprevailingconstructionpractices,theph ysicalpropertiesof thematerialsand lay downuniformrequirementsofstructuresfor thestorageofliquidsgivingdueconsideratio nto theabovementionedfactors,thisstandardhas beenpublishedin four parts, theotherparts in theseriesare:(Part2) :2009 Reinforcedconcretestructures(Part3).)

4 1967 Prestressedconcretestructures(Part4) : 1967 DesigntableWhilethecommonmethodsofdesign andconstructionhave beencoveredin thisstandard,for designofstructuresofspecialformsor inunusualcircumstances,specialliterature may bereferredto or in suchcasesspecialsystemsofdesignandconstr uctionmay bepermittedonproductionofsatisfactoryevi denceregardingtheiradequacyandsafetybyan alysisor test or thisstandardit has beenassumedthatthedesignofliquidretainin gstructures,whetherofplain,reinforcedorp restressedconcreteis entrustedto aqualifiedengineerand that theexecutionofthe work iscarriedoutunderthedirectionofa liquidretainingstructuresshouldhave lowpermeability,Thisisimportantnot only for itsdirecteffectonleakagebut alsohecauseit is one of the main factorsinfluencingdurability;resistancet oleaching,chemicalattack,erosion,abrasio nand frostdamage.

5 And ,therefore,incorporatesprovisionsindesig nandconstructionto IS456: 2000'Codeofpracticefor plain andreinforcedconcrete(fourth revision)'andIS 1343 :1980'Codeofpracticeforprestressedconcre te(firstrevision)',in so far as they apply, shall bedeemedto form partofthisstandardexceptwhereotherwisela id down in gooddesignandconstructionofstructure,use ofdenseconcrete,adequateconcretecover,go oddetailingpractices,controlofcracking,g oodqualityassurancemeasuresin line with numberofimportantmodificationsandchanges ,the mostimportantof thembeing:a)Scopehas beenclarifiedfurtherbymentioningexclusio nofdams,pipes,pipelines,linedstructuresa nddamp-proofingofbasements,b)Aclauseonex posureconditionhas )Provisionsforconcretehave beenmodifiedin.

6 Iine with IS456:2000withminimumgradeo('concreteasM 20forplaincementconcrete,M30forreinforce dconcreteand M40 forprestressedconcrete(seealsoNote2 underTable I),d)Themaximumcementcontenthas been modified from theearlierrequirementof530kg/rn" to 400kg/m',e)Adau~eon IS456in placeofearlierclauseonprotectionagainstc orrosion,f)Provisionsoncontrolofcracking have beenmodified,(Continuedon third cover) IS 3370(PartI) ( FirstRevision)1 (Part1)laysdowngeneralrequirementsfor the design andconstructionofplain,reinforced storageofliquids, mainly covered in IS 3370(Part2), and IS 3370(Part 3) Thisstandarddoes notcovertherequirementsforconcrete structures for storageofhot liquidsandliquidsoflowviscosity and highpenetratingpowerlike petrol,diesel, oil, etc.

7 Thisstandardalso does notcoverdams,pipes,pipelines, the storageofnon-aqueousliquids and the measuresnecessary wherechemicalattack ispossibleare alsonot dealt with. Therecommendations,however, maygenerallybeapplicableto thestorageatnormaltemperaturesofaqueousl iquidsandsolutionswhichhave nodetrimentalaction onconcreteand steel orwheresufficientprecautionsaretakentoen sureprotectionofconcreteand steel fromdamagedue toaction of suchliquidsas in The cri teria for designofRCCstagingfor overheadwater tanks are given in standards listed in Annex Acontainprovisions,whichthroughreference inthistext, the timeofpublication,the editionsindicatedwerevalid. Allstandardsaresubjectto revision andpartiestoagreementsbased onthisstandardareencouragedtoinvestigate thepossibilityofapplyingthe mostrecenteditionsofthestandards as given Therequirementsformaterialsshall begovernedby IS456and ,such as brick ortile,bloatedclayaggregatesandsinteredf 1yasbaggregates,be allowed forpartsofstructureeitherincontactwith the liquids on any face orenclosingthespaceabovethe tillers,jointsealingcompounds,and waterbarsshallconformto therequirementsofrelevant also not haveanyadverseeffect on thequalityofliquidto thepurposeofthisstandard.

8 Partsofthestructureretainingthe liquid orenclosingthe space above theliquidshallbeconsideredassubjectto'se vere'conditionas per caseofmembersexposedto 'verysevere'or'extreme'conditions,therel evantprovisionsofIS456shall in IS456and IS1343forconcreteshall apply forreinforcedconcreteandprestressedmembe rsrespectivelysubjectto thefollowingfurtherrequirements:a)Thecon creteshallconformto Table )Thecementcontentnotincludingf1yash andgroundgranulatedblast furnace slag in excessof400kglm) should notbeusedunless specialconsiderationhas been given in design to thinsections,ortoearlythermalcrackingand Theprovisionsfordurabilityshallgenerally be IS 3370(Part1) : 2009 Table 1 MinimumCementContent,MaximumWater-Cement RatioandMinimumGradeorConcrete[ (a)] (I)(2 )(3)(4)(5)i) ) ) :scribedinthis tableis irrespectiveofthepadcsofamelltanditisinc lusiveof addilions menlioned groundgranulatedblastfwnaccslagmaybetake nintoIIC':OUDIin!

9 HeconcretecompositionwithRlSJlCCtto thecementcODlentandwalerc:emcntratioifth esuitabilityisestablishedandaslong asthellI8llimum8 IDOWIlSIakenintoaa:ountdonot exceedthelimitofpozzoJanaandsillspecifie dinIS 1489(PartI) Forslllll1C8p1 Cilytanksupto50m'atIcx:ationswbeR:therei sdifficultyinprovidingM30padceoeerere,th eminimumgradeofeOIlC~ specifiedin IS 456 for plain and reinforcedconcretestructures. andasperIS1343for prestressedconcrete structures unless specified otherwise in minimumnominalcover to all reinforcementshall be asperIS 456 for relevant Thefollowingconditions ofthesite in relation tothefunctionalandstructuralrequirements oftheliquidretaining (storage)structurematerial1yinfluence themethodsof design and the cost of the structure:a)Physical characteristics of soil in which theliquidretaining structure may be partly orwholly enclosed and also the physical andgeologicalfeaturesofthesupportingfoun dations,b) Chemical properties of the soil and of theground water.

10 Andc) Extent of floatation at the and mentioned in should betakenintoaccountgenerallyasindicatedbe low:a)EarthPressure-Allowanceshould be madefortheeffectsof anyadversesoilpressureon2walls. according to the compactionand/orsurcharge of the soil and the conditionof thestructure during construction and in reliefshould be givenfor beneficial soilpressure effects on the walls of containmentstructure in the container full )Floatation-If in the siting of a liquidretainingstructure. water-loggedgroundcannotbeavoided, the danger of the externalwaterpressure shall be carefully guardedagainst by the following:I)Designing the structure to resist suchpressure underemptyor partially-emptyconditionsand takingprecautionstopreventfloatingandens uringstableequilibriumunderallconditions ofinternal and external loads.