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【英文标准名称】:StandardTestMethodsforIn-PlaceDensityofUnhardenedandHardenedConcrete,IncludingRollerCompactedConcrete,ByNuclearMethods
【原文标准名称】:用核法测定硬化和未硬化混凝土(包括辗实混凝土)实体密度的标准试验方法
【标准号】:ASTMC1040/C1040M-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】:C09.45
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acceptancetesting;backscattermeasurement;concrete-density;density;directtransmissionmeasurement;gammaradiation;in-placedensity;nucleartesting;roller-compactedconcrete;Backscatteringanalysis;Density--concrete;Directtransmission
【摘要】:Thesetestmethodsareusefulasrapid,nondestructivetechniquesforthein-placedeterminationofthedensityofunhardenedconcrete.Thebackscattertestmethodisalsousefulforthesamepurposeonhardenedconcrete.ThefundamentalassumptionsinherentinthetestmethodsarethatComptonscatteringisthedominantinteractionandthatthematerialundertestishomogeneous.Thesetestmethodsaresuitableforcontrolandforassistinginacceptancetestingduringconstruction,forevaluationofconcretequalitysubsequenttoconstruction,andforresearchanddevelopment.Note18212;Caremustbetakenwhenusingthesetestmethodsinmonitoringthedegreeofconsolidation,whichistheratiooftheactualdensityachievedtothemaximumdensityattainablewithaparticularconcrete.Thetestmethodspresentedhereareusedtodeterminetheactualdensity.Adensitymeasurement,byanytestmethod,isafunctionofthecomponentsoftheconcreteandmayvary,tosomeextent,inresponsetothenormal,acceptablevariabilityofthosecomponents.Testresultsmaybeaffectedbyreinforcingsteel,bythechemicalcompositionofconcreteconstituents,andbysampleheterogeneity.Thevariationsresultingfromtheseinfluencesareminimizedbyinstrumentdesignandbytheuser''scompliancewithappropriatesectionsofthetestprocedure.Resultsoftestsbythebackscattertestmethodmayalsobeaffectedbythedensityofunderlyingmaterial.Thebackscattertestmethodexhibitsspatialbiasinthattheapparatus''ssensitivitytothematerialunderitdecreaseswithdistancefromthesurfaceoftheconcrete.Note28212;Typically,backscattergaugereadingsrepresentthedensityinthetop75to100mm[3to4in.]ofmaterial.1.1Thesetestmethodscoverthedeterminationofthein-placedensityofunhardenedandhardenedconcrete,includingrollercompactedconcrete,bygammaradiation.FornotesonthenucleartestseeAppendixX1.1.2Twotestmethodsaredescribed,asfollows:
Section

TestMethodAx2014;DirectTransmissionTestMethodBx2014;Backscatter
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