Designation:C31/C31M−17StandardPracticeforMakingandCuringConcreteTestSpecimensintheField1ThisstandardisissuedunderthefixeddesignationC31/C31M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thispracticecoversproceduresformakingandcuringcylinderandbeamspecimensfromrepresentativesamplesoffreshconcreteforaconstructionproject.1.2Theconcreteusedtomakethemoldedspecimensshallbesampledafterallon-siteadjustmentshavebeenmadetothemixtureproportions,includingtheadditionofmixwaterandadmixtures.Thispracticeisnotsatisfactoryformakingspeci-mensfromconcretenothavingmeasurableslumporrequiringothersizesorshapesofspecimens.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(Warning—Freshhydrauliccementitiousmixturesarecausticandmaycausechemicalburnstoexposedskinandtissueuponprolongedexposure.2)1.5Thetextofthisstandardreferencesnoteswhichprovideexplanatorymaterial.Thesenotesshallnotbeconsideredasrequirementsofthestandard.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3C125Ter...
