Designation:C78/C78M−16StandardTestMethodforFlexuralStrengthofConcrete(UsingSimpleBeamwithThird-PointLoading)1ThisstandardisissuedunderthefixeddesignationC78/C78M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversthedeterminationoftheflexuralstrengthofconcretebytheuseofasimplebeamwiththird-pointloading.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C31/C31MPracticeforMakingandCuringConcreteTestSpecimensintheFieldC42/C42MTestMethodforObtainingandTestingDrilledCoresandSawedBeamsofConcreteC192/C192MPracticeforMakingandCuringConcreteTestSpecimensintheLaboratoryC617/C617MPracticeforCappingCylindricalConcreteSpecimensC1077PracticeforAgenciesTestingConcreteandConcreteAggregatesforUseinConstructionandCriteriaforTestingAgencyEvaluationE4PracticesforForceVerificationofTestingMachines3.SignificanceandUse3.1ThistestmethodisusedtodeterminetheflexuralstrengthofspecimenspreparedandcuredinaccordancewithTestMethodsC42/C42MorPracticesC31/C31MorC192/C192M.Resultsarecalculatedandreportedasthemodulusofrupture.Forthesamespecimensize,thestrengthdeterminedwillvaryiftherearedifferencesinspecimenpreparation,curingprocedure,moistureconditionattimeoftesting,andwhetherthebeamwasmoldedorsawedtosi...
