Designation:C472−99(Reapproved2014)StandardTestMethodsforPhysicalTestingofGypsum,GypsumPlastersandGypsumConcrete1ThisstandardisissuedunderthefixeddesignationC472;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thesetestmethodscoverthephysicaltestingofgypsum,gypsumplasters,andgypsumconcrete.1.2Thetestmethodsappearinthefollowingsections:SectionsPrecautionsforPhysicalTests4ReagentsandMaterials5FreeWater6Fineness7NormalConsistencyofGypsumPlaster8NormalConsistencyofGypsumConcrete9SettingTime10SettingTime(TemperatureRiseMethod)11CompressiveStrength12Density131.3Thevaluesregardedasthestandardareeitherininch-poundunitsorSI(metric).Thevaluesstatedfirstshallberegardedasthestandard.Valuesfollowinginparenthesesareapproximateandareprovidedforinformationpurposesonly.1.4Thetextofthisstandardreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)arenotrequirementsofthestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Foraspecificprecautionarystatement,seeX1.2.1.2.ReferencedDocuments2.1ASTMStandards:2C11TerminologyRelatingtoGypsumandRelatedBuildingMaterialsandSystemsC778SpecificationforSandE11SpecificationforWovenWireTestSieveClothandTestSieves3.Terminology3.1Definitions:3.1.1ForusefuldefinitionsrefertoTerminologyC11.4.PrecautionsforPhysicalTests4.1Gypsumproductsaregreatlyaffectedbysmallamountsofimpuritiesintroducedbycarelesslaboratorymanipulation.Inordertoobtainaccurateresults,itisabsolutelyessentialtoobservethefollowingprecautions:4.1....
