ASTM C42/C42M-2010 混凝土钻芯样和截梁样获取和测试的标准试验方法

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【英文标准名称】:StandardTestMethodforObtainingandTestingDrilledCoresandSawedBeamsofConcrete
【原文标准名称】:混凝土钻芯样和截梁样获取和测试的标准试验方法
【标准号】:ASTMC42/C42M-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:C09.61
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:compressivestrength;concretecoring;concretesawing;concretestrength;flexuralstrength;splittingtensilestrength;Tensileproperties/testing--concrete;Changeinlength;Compressiontesting--cement/concrete;Concretecores;Concretetestspeci
【摘要】:Thistestmethodprovidesstandardizedproceduresforobtainingandtestingspecimenstodeterminethecompressive,splittingtensile,andflexuralstrengthofin-placeconcrete.Generally,testspecimensareobtainedwhendoubtexistsaboutthein-placeconcretequalitydueeithertolowstrengthtestresultsduringconstructionorsignsofdistressinthestructure.Anotheruseofthismethodistoprovidestrengthinformationonolderstructures.Concretestrengthisaffectedbythelocationoftheconcreteinastructuralelement,withtheconcreteatthebottomtendingtobestrongerthantheconcreteatthetop.Corestrengthisalsoaffectedbycoreorientationrelativetothehorizontalplaneoftheconcreteasplaced,withstrengthtendingtobelowerwhenmeasuredparalleltothehorizontalplane.Thesefactorsshallbeconsideredinplanningthelocationsforobtainingconcretesamplesandincomparingstrengthtestresults.Thestrengthofconcretemeasuredbytestsofcoresisaffectedbytheamountanddistributionofmoistureinthespecimenatthetimeoftest.Thereisnostandardproceduretoconditionaspecimenthatwillensurethat,atthetimeoftest,itwillbeintheidenticalmoistureconditionasconcreteinthestructure.Themoistureconditioningproceduresinthistestmethodareintendedtoprovidereproduciblemoistureconditionsthatminimizewithin-laboratoryandbetween-laboratoryvariationsandtoreducetheeffectsofmoistureintroducedduringspecimenpreparation.Thereisnouniversalrelationshipbetweenthecompressivestrengthofacoreandthecorrespondingcompressivestrengthofstandard-curedmoldedcylinders.Therelationshipisaffectedbymanyfactorssuchasthestrengthleveloftheconcrete,thein-placetemperatureandmoisturehistory,andthestrengthgaincharacteristicsoftheconcrete.Historically,ithasbeenassumedthatcorestrengthsaregenerally85%ofthecorrespondingstandard-curedcylinderstrengths,butthisisnotapplicabletoallsituations.Theacceptancecriteriaforcorestrengtharetobeestablishedbythespecifierofthetests.ACI318providescorestrengthacceptancecriteriafornewconstruction.1.1Thistestmethodcoversobtaining,preparing,andtestingcoresdrilledfromconcreteforlengthorcompressivestrengthorsplittingtensilestrengthdeterminations.Note18212;AppendixX1providesrecommendationsforobtainingandtestingsawedbeamsforflexuralperformance.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thetextofthisstandardreferencesnotesandfootnotesthatprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthestandard.1.4Thisstandarddoesnotpurporttoaddressthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q14
【国际标准分类号】:91_100_30
【页数】:6P.;A4
【正文语种】:英语