Designation:C349−14StandardTestMethodforCompressiveStrengthofHydraulic-CementMortars(UsingPortionsofPrismsBrokeninFlexure)1ThisstandardisissuedunderthefixeddesignationC349;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationofthecom-pressivestrengthofhydraulic-cementmortars,usingforthetestspecimensportionsofprismsmadeandbrokeninflexureinaccordancewithTestMethodC348.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3ValuesinSIunitsshallbeobtainedbymeasurementinSIunitsorbyappropriateconversion,usingtheRulesforConversionandroundinggiveninStandardIEEE/ASTMSI10,ofmeasurementsmadeinotherunits.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(Warning—Freshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoskinandtissueuponprolongedexposure.2)2.ReferencedDocuments2.1ASTMStandards:3C109/C109MTestMethodforCompressiveStrengthofHydraulicCementMortars(Using2-in.or[50-mm]CubeSpecimens)C348TestMethodforFlexuralStrengthofHydraulic-CementMortarsC670PracticeforPreparingPrecisionandBiasStatementsforTestMethodsforConstructionMaterialsIEEE/ASTMSI10StandardforUseoftheInternationalSystemofUnits(SI):TheModernMetricSystem3.SignificanceandUse3.1ThismethodprovidesameansofobtainingcompressivestrengthvaluesfromthesamespecimenspreviouslyusedforflexuralstrengthdeterminationsbyTestMethodC348.Thecompressivestrengthvaluesareforreferencepurposes,andnotassubstitutesforvaluesobtainedbyTestMethodC109/C109Mforcementacceptance.4.Apparatus4.1BearingPlates—Thebearingplatesshallbe≥25mminthickness...
