Designation:C1231/C1231M−15StandardPracticeforUseofUnbondedCapsinDeterminationofCompressiveStrengthofHardenedCylindricalConcreteSpecimens1ThisstandardisissuedunderthefixeddesignationC1231/C1231M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThispracticecoversrequirementsforacappingsystemusingunbondedcapsfortestingconcretecylindersmoldedinaccordancewithPracticeC31/C31MorC192/C192M,orcoresobtainedinaccordancewithTestMethodC42/C42M.Un-bondedneoprenecapsofadefinedhardnessarepermittedtobeusedfortestingforaspecifiedmaximumnumberofreuseswithoutqualificationtestinguptoacertainconcretecompres-sivestrengthlevel.Abovethatstrength,levelneoprenecapswillrequirequalificationtesting.Qualificationtestingisre-quiredforallelastomericmaterialsotherthanneopreneregardlessoftheconcretestrength.1.2Unbondedcapsarenottobeusedforacceptancetestingofconcretewithcompressivestrengthbelow10MPa[1500psi]orabove80MPa[12000psi].1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.(Warning—Concretespecimenstestedwithunbondedcapsrupturemoreviolentlythancomparablespecimenstestedwithbondedcaps.ThesafetyprecautionsgivenintheManualofAggregateandConcreteTestingarerecommended.2)2.ReferencedDocuments2.1ASTMStandards:3C31/C31MPracticeforMakingandCuringConcreteTestSpecimensintheFieldC39/C39MTestMethodforCompressiveStrengthofCylin-dricalConcre...
