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【英文标准名称】:StandardTestMethodsforMinimumIndexDensityandUnitWeightofSoilsandCalculationofRelativeDensity
【原文标准名称】:土壤最低标准密度和单位重量与相对密度计算的标准试验方法
【标准号】:ASTMD4254-2000(2006)e1
【标准状态】:现行
【国别】:美国
【发布日期】:2000
【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】:minimumindexdensity;minimumindexunitweight;relativedensity;Cohesionlesssoil;Compactionmeasurement--soils;Density--soil/rock/relatedmaterials
【摘要】:Thedensity/unitweightofacohesionlesssoilmaybedeterminedbyvariousin-placemethodsinthefieldorbythemeasurementofphysicaldimensionsandmassesbylaboratorysoilspecimens.Thedrydensity/unitweightofacohesionlesssoildoesnotnecessarily,byitself,revealwhetherthesoilislooseordense.Relativedensity/unitweightexpressesthedegreeofcompactnessofacohesionlesssoilwithrespecttotheloosestanddensestconditionasdefinedbystandardlaboratoryprocedures.Onlywhenviewedagainstthepossiblerangeofvariation,intermsofrelativedensity/unitweight,canthedrydensity/unitweightberelatedtothecompactioneffortusedtoplacethesoilinacompactedfillorindicatevolumechangeandstress-straintendenciesofsoilwhensubjectedtoexternalloading.Anabsoluteminimumdensity/unitweightisnotnecessarilyobtainedbythesetestmethods.Note18212;Inaddition,therearepublisheddatatoindicatethatthesetestmethodshaveahighdegreeofvariability.However,thevariabilitycanbegreatlyreducedbycarefulcalibrationofequipment,andcarefulattentiontopropertestprocedureandtechnique.Theuseofthestandardmolds(6.3.1)hasbeenfoundtobesatisfactoryformost1.1Thesetestmethodscoverthedeterminationoftheminimum-indexdrydensity/unitweightofcohesionless,free-drainingsoils.Theadjectivex201C;dryx201D;beforedensityorunitweightisomittedinthetitleandremainingportionsofthisstandardstobebeconsistentwiththeapplicabledefinitionsgiveninSection3onTerminology.1.2Systemofunits:1.2.1Thetestingapparatusdescribedinthisstandardhasbeendevelopedandmanufacturedusingvaluesinthegravimetricorinch-poundsystem.Therefore,testapparatusdimensionsandmassgivenininch-poundunitsareregardedasthestandard.1.2.2Itiscommonpracticeintheengineeringprofessiontoconcurrentlyusepoundstorepresentbothaunitofmass(lbm)andaunitofforce(lbf).Thisimplicitlycombinestwoseparatesystemsofunits;thatis,theabsolutesystemandthegravitationalsystem.Itisscientificallyundesirabletocombinetheuseoftwoseparatesetsofinch-poundunitswithinasinglestandard.Thistestmethodhasbeenwrittenusingthegravitationalsystemofunitswhendealingwiththeinch-poundsystem.Inthissystem,thepound(lb
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:9P.;A4
【正文语种】:英语