Designation:C845/C845M−12StandardSpecificationforExpansiveHydraulicCement1ThisstandardisissuedunderthefixeddesignationC845/C845M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcovershydrauliccementsthatexpandduringtheearlyhardeningperiodaftersetting.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.2.ReferencedDocuments2.1ASTMStandards:2C33SpecificationforConcreteAggregatesC109/C109MTestMethodforCompressiveStrengthofHydraulicCementMortars(Using2-in.or[50-mm]CubeSpecimens)C114TestMethodsforChemicalAnalysisofHydraulicCementC183PracticeforSamplingandtheAmountofTestingofHydraulicCementC185TestMethodforAirContentofHydraulicCementMortarC188TestMethodforDensityofHydraulicCementC465SpecificationforProcessingAdditionsforUseintheManufactureofHydraulicCementsC688SpecificationforFunctionalAdditionsforUseinHydraulicCementsC806TestMethodforRestrainedExpansionofExpansiveCementMortarC807TestMethodforTimeofSettingofHydraulicCementMortarbyModifiedVicatNeedle3.Terminology3.1Definitions:3.1.1expansivecement(K)—anexpansivecementcontain-inganhydrouscalciumaluminosulfate(4CaO·3Al2O3·SO3),calciumsulfate,anduncombinedcalciumoxide.3.1.2expansivecement(M)—anexpansivecementcontain-ingcalciumaluminatecementandcalciumsulfate.3.1.3expansivecement(S)—anexpansivecementcontain-ingtricalciumaluminate(C3A)andcalciumsulfate.3.1.4expansivehydrauliccement—acementcomposedes-sentiallyofhydrauliccalciumsilicates,calciumaluminatesandcalciumsulfates,which,uponbeingmixedwithwater,formsapastethatincreasessignificantlyinvolumeduringtheearlyhardeningperiodoc...
