ASTM D5220-2008 用中子深探针法对地表土壤和岩石中单位体积含水量的标准试验方法

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【英文标准名称】:StandardTestMethodforWaterMassperUnitVolumeofSoilandRockIn-PlacebytheNeutronDepthProbeMethod
【原文标准名称】:用中子深探针法对地表土壤和岩石中单位体积含水量的标准试验方法
【标准号】:ASTMD5220-2008
【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】:D18.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:depthprobe;in-placewatercontent;insituwatercontent;neutronprobe;nuclearmethods;watermassperunitvolume;Calibration--soil/rockanalysisinstrumentation;Depthprofiling;Massperunitvolume;Neutronradiation--soil;Nondestructiveevalua
【摘要】:Thistestmethodisusefulasarapid,nondestructivetechniqueforthecalculationofthein-placewatermassperunitvolumeofsoilandrockatdesireddepthsbelowthesurface.Thistestmethodisusefulforinformationalandresearchpurposes.ItshouldonlybeusedforqualitycontrolandacceptancetestingwhencorrelatedtoactualwatermassperunitvolumeusingproceduresandmethodsdescribedinA1.2.3.Thenon-destructivenatureofthistestmethodallowsrepetitivemeasurementstobemadeatasingletestlocationforstatisticalanalysisandtomonitorchangesovertime.ThefundamentalassumptionsinherentinthistestmethodarethatthematerialundertestishomogeneousandhydrogenpresentisintheformofwaterasdefinedbyTestMethodD2216.Note18212;Thequalityoftheresultproducedbythisstandardtestmethodisdependentonthecompetenceofthepersonnelperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection,andthelike.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodcoversthecalculationofthewatermassperunitvolumeofsoilandrockbythermalizationorslowingoffastneutronswheretheneutronsourceandthethermalneutrondetectorareplacedatthedesireddepthintheboredholelinedbyanaccesstube(seeNote3).1.1.1ForlimitationsseeSection6onInterferences.1.2Thewatermassperunitvolume,expressedasmassperunitvolumeofthematerialundertest,iscalculatedbycomparingthethermalneutroncountratewithpreviouslyestablishedcalibrationdata(seeAnnexA1).1.3Aprecisionstatementhasnotbeendevelopedforthisstandardatthistime.Therefore,thisstandardshouldnotbeusedforacceptanceorrejectionofamaterialforpurchasingpurposesunlesscorrelatedtootheracceptedASTMmethods.1.4ThevaluesexpressedinSIunitsareregardedasthestandard.Theinch-poundunitsgiveninparenthesesmaybeapproximateandareprovidedforinformationonly.1.5AllobservedandcalculatedvaluesshallconformtotheguideforsignificantdigitsandroundingestablishedinPracticeD6026.1.5.1Theproceduresusedtospecifyhowdataarecollected,recorded,andcalculatedinthisstandardareregardedastheindustrystandard.Inaddition,theyarerepresentativeofthesignificantdigitsthatshouldgenerallyberetained.Theproceduresuseddonotconsidermaterialvariation,purposeforobtainingthedata,specialpurposestudies,oranyconsiderationsfortheuserx2019;sobjectives;anditiscommonpracticetoincreaseorreducesignificantdigitsofreporteddatatobecommensuratewiththeseconsiderations.Itisbeyondthescopeofthisstandardtoconsidersignificantdigitsusedinanalysismethodsforengineeringdesign.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.SpecifichazardsaregiveninSection8.
【中国标准分类号】:P13
【国际标准分类号】:13_080_40
【页数】:7P.;A4
【正文语种】:英语