Designation:C342–97AnAmericanNationalStandardStandardTestMethodforPotentialVolumeChangeofCement-AggregateCombinations1ThisstandardisissuedunderthefixeddesignationC342;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthepoten-tialexpansionofcement-aggregatecombinationsbymeasuringthelinearexpansiondevelopedbythecombinationsinmortarbarssubjectedtovariationsoftemperatureandwatersaturationduringstorageunderprescribedconditionsoftest.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.2.ReferencedDocuments2.1ASTMStandards:C109/C109MTestMethodforCompressiveStrengthofHydraulicCementMortars(Using2-in.or[50-mm]CubeSpecimens)2C150SpecificationforPortlandCement2C227TestMethodforPotentialAlkaliReactivityofCement-AggregateCombinations(Mortar-BarMethod)3C305PracticeforMechanicalMixingofHydraulicCementPastesandMortarsofPlasticConsistency2C490PracticeforUseofApparatusfortheDeterminationofLengthChangeofHardenedCementPaste,Mortar,andConcrete3C856PracticeforPetrographicExaminationofHardenedConcrete3E11SpecificationforWire-ClothSievesforTestingPur-poses43.SignificanceandUse3.1Thistestmethodhasbeenfoundtoproducesignificantexpansionsofcement-aggregatecombinationswhenthece-mentinsomecaseshasaverylowalkalicontent,andinothercases,wheretheaggregateispresumptivelynonreactivewithalkalies.Ithasbeensuggestedthatthetestmethodmeasuresinteractionsofphenomenapossiblyincludingmicrocrackingeffectsthatareinsomecasesphysicalandperhapsinothercaseschemical.3.2Noacceptancelimitsforexpansionofcement-aggregatecombina...
