ASTM D6938-2010 核方法(浅深度)测定土壤和土集料的现场密度和含水率的标准试验方法

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【英文标准名称】:StandardTestMethodforIn-PlaceDensityandWaterContentofSoilandSoil-AggregatebyNuclearMethods(ShallowDepth)
【原文标准名称】:核方法(浅深度)测定土壤和土集料的现场密度和含水率的标准试验方法
【标准号】:ASTMD6938-2010
【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】:D18.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Compactiontest;acceptancetesting;constructioncontrol;qualitycontrol;fielddensity;in-placedensity;wetdensity;watercontent;drydensity;nuclearmethods,nucleargauge;In-placedensity(ofsoil);Nuclearmethods;Shallowdepthtest;Soil;So
【摘要】:Thetestmethoddescribedisusefulasarapid,nondestructivetechniqueforin-placemeasurementsofwetdensityandwatercontentofsoilandsoil-aggregateandthedeterminationofdrydensity.Thetestmethodisusedforqualitycontrolandacceptancetestingofcompactedsoilandsoil-aggregatemixturesasusedinconstructionandalsoforresearchanddevelopment.Thenondestructivenatureallowsrepetitivemeasurementsatasingletestlocationandstatisticalanalysisoftheresults.Density8212;ThefundamentalassumptionsinherentinthemethodsarethatComptonscatteringisthedominantinteractionandthatthematerialishomogeneous.WaterContent8212;Thefundamentalassumptionsinherentinthetestmethodarethatthehydrogenionspresentinthesoilorsoil-aggregateareintheformofwaterasdefinedbythewatercontentderivedfromTestMethodsD2216,andthatthematerialishomogeneous.(See5.2)Note18212;Thequalityoftheresultproducedbythisstandardtestmethodisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection,andthelike.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethoddescribestheproceduresformeasuringin-placedensityandmoistureofsoilandsoil-aggregatebyuseofnuclearequipment.Thedensityofthematerialmaybemeasuredbydirecttransmission,backscatter,orbackscatter/air-gapratiomethods.Measurementsforwater(moisture)contentaretakenatthesurfaceinbackscattermoderegardlessofthemodebeingusedfordensity.ItistheintentofthissubcommitteethatthisstandardreplaceD2922andD3017.1.1.1ForlimitationsseeSection5onInterferences.1.2Thetotalorwetdensityofsoilandsoil-aggregateismeasuredbytheattenuationofgammaradiationwhere,indirecttransmission,thesourceisplacedataknowndepthupto300mm(12in.)andthedetector(s)remainsonthesurface(somegaugesmayreversethisorientation);orinbackscatterorbackscatter/air-gapthesourceanddetector(s)bothremainonthesurface.1.2.1Thedensityofthetestsampleinmassperunitvolumeiscalculatedbycomparingthedetectedrateofgammaradiationwithpreviouslyestablishedcalibrationdata.1.2.2Thedrydensityofthetestsampleisobtainedbysubtractingthewatermassperunitvolumefromthetestsamplewetdensity(Section11).Mostgaugesdisplaythisvaluedirectly.1.3Thegaugeiscalibratedtoreadthewatermassperunitvolumeofsoilorsoil-aggregate.Whendividedbythedensityofwaterandthenmultipliedby100,thewatermassperunitvolumeisequivalenttothevolumetricwatercontent.Thewatermassperunitvolumeisdeterminedbythethermalizingorslowingoffastneutronsbyhydrogen,acomponentofwater.Theneutronsourceandthethermalneutrondetectorarebothlocatedatthesurfaceofthematerialbeingtested.Thewate......
【中国标准分类号】:Q13
【国际标准分类号】:13_080_20
【页数】:10P.;A4
【正文语种】:英语