Designation:C39/C39M−17bStandardTestMethodforCompressiveStrengthofCylindricalConcreteSpecimens1ThisstandardisissuedunderthefixeddesignationC39/C39M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thistestmethodcoversdeterminationofcompressivestrengthofcylindricalconcretespecimenssuchasmoldedcylindersanddrilledcores.Itislimitedtoconcretehavingadensityinexcessof800kg/m3[50lb/ft3].1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Theinch-poundunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(Warning—Meansshouldbeprovidedtocontainconcretefragmentsduringsuddenruptureofspecimens.Tendencyforsuddenruptureincreaseswithincreasingconcretestrengthanditismorelikelywhenthetestingmachineisrelativelyflexible.ThesafetyprecautionsgivenintheManualarerecommended.)1.4Thetextofthisstandardreferencesnoteswhichprovideexplanatorymaterial.Thesenotesshallnotbeconsideredasrequirementsofthestandard.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2C31/C31MPracticeforMakingandCuringConcreteTestSpecimensintheFi...
