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【英文标准名称】:StandardTestMethodsforLaboratoryDeterminationofDensity(UnitWeight)ofSoilSpecimens
【原文标准名称】:实验室测定土壤样品的密度(单位重量)的标准试验方法
【标准号】:ASTMD7263-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【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】:D18.03
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:density;porosity;saturation;specimen;unitweight;voidratio
【摘要】:Drydensity,asdefinedasx201C;densityofsoilorrockx201D;inTerminologyD653andx201C;bulkdensityx201D;bysoilscientists,canbeusedtoconvertthewaterfractionofsoilfromamassbasistoavolumebasisandvise-versa.Whenparticledensity,thatis,specificgravity(TestMethodsD854)isalsoknown,drydensitycanbeusedtocalculateporosityandvoidratio(seeAppendixX1).Drydensitymeasurementsarealsousefulfordeterminingdegreeofsoilcompaction.Sincemoisturecontentisvariable,moistsoildensityprovideslittleusefulinformationexcepttoestimatetheweightofsoilperunitvolume,forexample,poundspercubicyard,atthetimeofsampling.Sincesoilvolumeshrinkswithdryingofswellingsoils,bulkdensitywillvarywithmoisturecontent.Hence,thewatercontentofthesoilshouldbedeterminedatthetimeofsampling.Densities(unitweights)ofremolded/reconstitutedspecimensarecommonlyusedtoevaluatethedegreeofcompactionofearthenfills,embankments,etc.Drydensityvaluesareusuallyusedinconjunctionwithcompactioncurvevalues(TestMethodsD698andD1557).Density(unitweight)isoneofthekeycomponentsindeterminingthemasscomposition/phaserelationsofsoil,seeAppendixX1.Note18212;Thequalityoftheresultproducedbythisstandardisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting/sampling/inspection/etc.UsersofthisstandardarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliableresults.Reliableresultsdependonseveralfactors;PracticeD3740providesameansofevaluatingsomeofthesefactors.1.1Thesetestmethodsdescribetwowaysofdeterminingthetotal/moistanddrydensities(unitweights)ofintact,disturbed,remolded,andreconstituted(compacted)soilspecimens.Density(unitweight)asusedinthisstandardmeansthesameasx201C;bulkdensityx201D;ofsoilasdefinedbytheSoilScienceSocietyofAmerica.Intactspecimensmaybeobtainedfromthin-walledsamplingtubes,blocksamples,orclods.Specimensthatareremoldedbydynamicorstaticcompactionproceduresmayalsobemeasuredbythesemethods.Thesemethodsapplytosoilsthatwillretaintheirshapeduringthemeasurementprocessandmayalsoapplytoothermaterialssuchassoil-cement,soil-lime,soil-bentoniteorsolidifiedsoil-bentonite-cementslurries.Itiscommonforthedensity(unitweight)ofspecimensafterremovalfromsamplingtubesandcompactionmoldstobelessthanthevaluebasedontubeormoldvolumes,orofin-situconditions.Thisisduetothespecimenswellingafterremovaloflateralpressures.1.1.1MethodAcoverstheprocedureformeasuringthevolumeofwaxcoatedspecimensbydeterminingthequantityofwaterdisplaced.1.1.1.1Thismethodonlyappliestospecimensinwhichthewaxwillnotpenetratetheoutersurfaceofthespecimen.1.1.2MethodBcoverstheprocedurebymeansofthedirectmeasurementofthedimensionsandmassofaspecimen,usuallyoneofcylindricalshape.Intactandreconstituted/remoldedspecimensmaybetestedbythismethodinconjunctionwithstrength,permeability(air/water)andcompressibilitydeterminations.1.2ThevaluesstatedinSIunitsare......
【中国标准分类号】:B11
【国际标准分类号】:13_080_20
【页数】:7P.;A4
【正文语种】:英语