Designation:C451−13StandardTestMethodforEarlyStiffeningofHydraulicCement(PasteMethod)1ThisstandardisissuedunderthefixeddesignationC451;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofearlystiffeninginhydraulic-cementpaste.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.Warning:Freshhydraulic-cementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.21.4Thetextofthisstandardreferencesnotesandfootnoteswhichprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthestandard.2.ReferencedDocuments2.1ASTMStandards:3C150SpecificationforPortlandCementC183PracticeforSamplingandtheAmountofTestingofHydraulicCementC187TestMethodforAmountofWaterRequiredforNor-malConsistencyofHydraulicCementPasteC219TerminologyRelatingtoHydraulicCementC305PracticeforMechanicalMixingofHydraulicCementPastesandMortarsofPlasticConsistencyC670PracticeforPreparingPrecisionandBiasStatementsforTestMethodsforConstructionMaterialsC1005SpecificationforReferenceMassesandDevicesforDeterminingMassandVolumeforUseinthePhysicalTestingofHydraulicCementsD1193SpecificationforReagentWater3.Terminology3.1Definitions:3.1.1earlystiffening,n—theearlydevelopmentofstiffnessintheworkingcharacteristicsofahydraulic-cementpaste,mortar,orconcrete;varietiesincludefalsesetandflashset.3.1.2falseset,n—theearlydevelopmentofstiffnessintheworkingcharacteristicsofahydraulic-cementpaste,mort...
