作者:标准资料网 时间:2024-05-03 11:11:55   浏览:8917   来源:标准资料网

【英文标准名称】:StandardTestMethodforMeasuringStiffnessandApparentModulusofSoilandSoil-AggregateIn-PlacebyElectro-MechanicalMethod
【原文标准名称】:用电动机械法测量土壤和土壤集料实体的硬挺度和表观模数的标准试验方法
【标准号】:ASTMD6758-2008
【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】:compactioncontrol;in-placemodulus;in-placestiffness;in-situtest;non-destructive;productiontesting;shearmodulus;soilstiffnesstest;stiffnessgauge;Young'smodulus;Compactioncontrol;Electromechanicalprocessing/devices;In-place
【摘要】:Theapparatusandproceduredescribedprovidesameansformeasurementofthestiffnessofalayerofsoilorsoil-aggregatemixturefromwhichaYoung''smodulusmaybedeterminedforanassumedPoisson''sratio.Lowstraincyclicloadingisappliedbytheapparatusaboutastaticloadthatisconsistentwithhighwayapplications(1).Thismethodisusefulasanon-destructivemethodformonitoringorcontrollingcompactionsoastoavoidunder-compaction,over-compactionorwastedeffort.Throughanunderstandingofhowstiffnessrelatestodensityforaparticularmaterial,moisturecontentandcompactionprocedure,thestiffnessachievedcanberelatedto%compactioninconnectionwithdensitybasedcompactioncontrolorspecifications,forexample,tomeettherequirementsofMethodD698usingstandardeffortorMethodD1557usingmodifiedeffort.Thismethodappliestosiltyandclayeymaterialscontaininggreaterthan20%fines.Insuchcases,therelationshipbetweenstiffnessanddrydensityordryunitweightissensitivetothewatercontent.Watercontentsshouldbedeterminedbyuseof:TestMethodD2216,D4643,orD4959.Ifthedeterminationcannotbemadeimmediatelyatthetimeofthestiffnessmeasurements,thensoilsamplesshallbepreservedandtransportedinaccordancewithPracticeD4220,Section8,GroupsB,C,orDsoils.Thismethodisusefulintheconstructionofroadbasesorearthworks,includingtheinstallationofburiedpipe(2).Therapid,non-penetratingnatureofthismethodissuitedtoproductiontesting,forexample,itprovidesameansoftestingthatdoesnotnecessarilyinterferewithordelayconstruction.Thismethodissuitableformitigatingtheriskofpavementfailure.Byassuringtherelativeuniformityofhighwaysubbase,subgradeandbasestiffnesses,stressesonthepavementismoreuniformlydistributed.Inthiswaythelifeofapavementisextendedandrepairsminimized.Thismethodissuitablefordeterminingwhenthesurfaceofasoilorsoil-aggregatestructureiscapableofsupportingdesignloads.Thisisusefulforstabilizedfillswherethematerialhardens(stiffens)overtimewithoutmeasurablechangesindensityormoisturecontent.Thistestmethodissuitableforthein-placedeterminationofaYoung''sandashearmodulusofsoilandsoil-aggregatemixtures(3,4).Stiffness,asmeasuredbythismethod,isrelatedtomodulus(5)fromanassumptionofPoisson''sratioandfromtheradiusofthefootoftheapparatusasfollows:where:Kgr

【中国标准分类号】:Q13
【国际标准分类号】:93_020
【页数】:5P.;A4
【正文语种】:英语