Designation:C1768/C1768M−12(Reapproved2017)StandardPracticeforAcceleratedCuringofConcreteCylinders1ThisstandardisissuedunderthefixeddesignationC1768/C1768M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstwoproceduresformakingandcuringcylindricalspecimensofconcreteunderconditionsthatincreasetherateofhydrationatearlyages.Theproceduresare:A—WarmWaterMethodandB—AutogenousCuringMethod.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(Warning—Freshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.2)1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3C31/C31MPracticeforMakingandCuringConcreteTestSpecimensintheFieldC39/C39MTestMethodforCompressiveStrengthofCylin-dricalConcreteSpecimensC125TerminologyRelatingtoConcreteandConcreteAg-gregatesC143/C143MTestMethodforSlumpofHydraulic-CementConcreteC172/C172MPracticeforSamplingFreshlyMixedCon-creteC173/C173MTestMethodforAirContentofFreshlyMixedConcretebytheVolumetricMethodC192/C192MPracticeforMakingandCuringConcreteTestSpec...
