Designation:C563−18aStandardGuideforApproximationofOptimumSO3inHydraulicCement1ThisstandardisissuedunderthefixeddesignationC563;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThisguidedescribesthedeterminationofapproximateoptimumSO3formaximumperformanceasaresultofsubsti-tutingcalciumsulfateforaportionofthecement.1.2Thisguidereferstothesulfurtrioxide(SO3)contentofthecementonly.Slagcementsandoccasionallyotherhydrauliccementscancontainsulfideorotherformsofsulfur.ThedeterminationofSO3contentbyrapidmethodsmayincludetheseotherforms,andmaythereforeproduceasignificanterror.Ifasignificanterroroccurs,analyzethecementforSO3contentusingthereferencetestmethodofTestMethodsC114forsulfurtrioxide.1.3ValuesstatedasSIunitsaretoberegardedasstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C39/C39MTestMethodforCompressiveStrengthofCylin-dricalConcreteSpecimensC78/C78MTestMethodforFlexuralStrengthofConcrete(UsingSimpleBeamwithThird-PointLoading)C109/C109MTestMethodforCompressiveStrengthofHydraulicCementMortars(Using2-in.or[50-mm]CubeSpecimens)C114TestMethodsforChemicalAnalysisofHydraulicCementC150/C150MSpecificationforPortlandCementC192/C192MPracticeforMakingandCuringConcreteTestSpecimensintheLaboratoryC204TestMethodsforFinenessofHydraul...
