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1、IIS455:1888(Reaffiid19951IndianStandardPORTLANDSLAGCEMENT-SPECIFICATION(FourthRevision)SecondReprintSEPTEMBER1998UDC666’943@BIS1990BUREAUOFINDIANSTANDARDSMANAKBHAVAN,9BAHADURSHAHZAFARMARGNEWDELHI110002May1990e-4CenmntandConcreteSectionalCommittee,CED2FOREWORDThisIndianStandard(FourthRevision)wasa
2、doptedbytheBureauofIndianStandardson30October1989,afterthedraftfinalizedbytheCement.andConcreteSectionalCommitteehadbeenapprovedbytheCivilEngineeringDivisionCouncil.Portlandslagcementisobtainedbymixing,Portlandcementclinker,gypsumandgranulatedslaginsuitableproportionsandgrindingthemixturetogetath
3、oroughandintimatemixbetweentheconsti-tuents.ItmayalsobemanufacturedbyseparatelygrindingPortlandcementclinker,gypsumandgranulatedslagandthenmixingthemintimately..TheresultantproductisacementwhichhasphysicalpropertiessimilartothoseofordinaryPortlandcement.Inaddition,ithaslowheatofhydrationandisrela
4、tivelybetterresistanttosoilsandwatercontainingexcessiveamountsofsulphaterofalkalimetals.aluminaandiron,aswell-astoacidicwaters,andcan,therefore,be‘usedformarineworkswithadvantage.ThemanufactureofPortlandslagcementhasbeendevelopedprimarilytoutilizeblastfumaceslag,awasteproductfromblastfurnaces.The
5、developmentofmanufactureofthistypeofcementwillconsiderablyincreasethetotaloutputofcementproductioninthecountryandwill,inaddition,pro-videaprofitableuseforanotherwisewasteproduct.Theslagsobtainedfromothertypesoffurnaces,buthavingidenticalpropertiesasthoseofgranulatedblastfumaceslagconformingtothis
6、standard,mayalsobeusedformanufactureofPortlandslagcement.Thisstandardwasfirstpublishedinlb53andsubsequentlyrevisedin1962,1967and1976.Thisfourthrevisionincorporatesthemodificationsrequiredasaresultofexperiencegainedwiththeuseofthisspecificationandtobringthestandardinlinewithtlsepresentpracticesfol
7、lowedintheproductionandtestingofcement.Sincepublicationofthethirdrevisionofthisstandard,largenumberofamendmentshavebeenissuedfromtimetotimeinordertomodifyvariousrequirementsbasedontheexperiencegainedwiththeuseofthestan