ASTM C805/C805M-2008 硬化混凝土的回弹指数的标准试验方法

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【英文标准名称】:StandardTestMethodforReboundNumberofHardenedConcrete
【原文标准名称】:硬化混凝土的回弹指数的标准试验方法
【标准号】:ASTMC805/C805M-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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】:C09.64
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:concrete;in-placestrength;nondestructivetesting;reboundhammer;reboundnumber;Driveweight(hammer)kineticenergy;Nondestructiveevaluation(NDE)--concrete/masonry;Rebound;Spring-drivensteelhammer
【摘要】:Thistestmethodisapplicabletoassessthein-placeuniformityofconcrete,todelineateregionsinastructureofpoorerqualityordeterioratedconcrete,andtoestimatein-placestrength.Relationshipsbetweenreboundnumberandconcretestrengththatareprovidedbyinstrumentmanufacturersshallbeusedonlytoprovideindicationsofrelativeconcretestrengthatdifferentlocationsinastructure.Tousethistestmethodtoestimatestrength,itisnecessarytoestablisharelationshipbetweenstrengthandreboundnumberforagivenconcretemixtureandgivenapparatus.Establishtherelationshipbycorrelatingreboundnumbersmeasuredonthestructurewiththestrengthsofcorestakenfromcorrespondinglocations.Atleasttworeplicatecoresshallbetakenfromatleastsixlocationswithdifferentreboundnumbers.Selecttestlocationssothatawiderangeofreboundnumbersinthestructureisobtained.Obtain,moisturecondition,andtestcoresinaccordancewithTestMethodC42/C42M.Note18212;SeeACI228.1Rforadditionalinformationondevelopingtherelationshipandonusingtherelationshiptoestimatein-placestrength.Foragivenconcretemixture,thereboundnumberisaffectedbyfactorssuchasmoisturecontentofthetestsurface,themethodusedtoobtainthetestsurface(typeofformmaterialortypeoffinishing),verticaldistancefromthebottomofaconcreteplacement,andthedepthofcarbonation.Thesefactorsneedtobeconsideredininterpretingreboundnumbers.Differenthammersofthesamenominaldesignmaygivereboundnumbersdifferingfrom1to3units.Therefore,testsshouldbemadewiththesamehammerinordertocompareresults.Ifmorethanonehammeristobeused,performtestsonarangeoftypicalconcretesurfacessoastodeterminethemagnitudeofthedifferencestobeexpected.Thistestmethodisnotsuitableasthebasisforacceptanceorrejectionofconcrete.1.1Thistestmethodcoversthedeterminationofareboundnumberofhardenedconcreteusingaspring-drivensteelhammer.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q11
【国际标准分类号】:91_100_30
【页数】:3P.;A4
【正文语种】:英语