ASTM D5080-2008 百分比压缩的快速测量的标准试验方法

作者:标准资料网 时间:2024-05-06 20:07:07  浏览:9159   来源:标准资料网

【英文标准名称】:StandardTestMethodforRapidDeterminationofPercentCompaction
【原文标准名称】:百分比压缩的快速测量的标准试验方法
【标准号】:ASTMD5080-2008
【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;density;fielddensity;fieldtest;moisturecontent;moisturecontrol;moisture-density;rapidcompactioncontrol;unitweight;Unitweight;Acceleratedaging/testing;Compactionmeasurement--soils;Density--soil/rock/relatedm
【摘要】:p>Therapidmethodisperformedtoquicklyevaluatepercentcompactionandvariationfromoptimummoisturecontentofsoilsusedinconstructionwithoutknowingthevalueoffieldmoisturecontentatthetimeofthetest.Testresultsareusuallydeterminedwithin1to2hfromthestartofthetest.Thevalueofpercentcompactionobtainedusingtherapidmethodwillbethesameasthepercentcompactioncalculatedusingdrydensityvalues.Thevalueofthedifferencebetweenfieldmoisturecontentandoptimummoisturecontentwillbeapproximate,butwillbewithinx00B1;0.1to0.2percentagepointofthedifferencecalculatedoncethefieldmoisturecontentisknown.TestresultsmaybeusedtodetermineifthecompactedmaterialmeetsdensityandmoisturecontrolvaluesthatarespecifiedasapercentageofastandardmaximumdensityandoptimummoisturecontentsuchasdeterminedinMethodAofTestMethodsD698.Athree-pointcompactioncurveisusedinplaceofthefour-orfive-pointcurverequiredinTestMethodsD698.Thistestmethodisbasedontheassumptionthatathree-pointcompactioncurveisaparabolaatthesectionofthecurveclosetooptimummoisturecontentsothatthepeakpointofthecurvecanbedeterminedmathematically.Thisassumptionresultsinthemajordifferencebetweenthistestmethodandobtainingthemaximumdensityandoptimummoisturecontentfromafullfive-pointcompactioncurve.Oncethefieldovendrymoisturecontenthasbeendetermined,thevaluesofdrydensity,dryunitweight,andoptimummoisturecontentcanbecalculated(seeNote1).Thistestmethodcanalsobeusedforfoundationorborrowareamaterialtocomparein-placedrydensityandunitweightandmoisturecontenttolaboratorymaximumdrydensityandunitweightandoptimummoisturecontent.Thistestmethodhastheadvantagethatthemaximumdensityvaluecanbeobtainedonthesamesoilexcavatedduringthein-placedensitytest.Note18212;Sincethereisnoneedtoimmediatelydeterminethemoisturecontentsofmaterialfromthein-placedensitytestorthelaboratorycompactionpoints,useofrapidmoisturecontentdeterminationssuchasmicrowave,directheat,nuclear,etc.,isnotneeded.However,ifdesired,thepercentcompactionandvariationfromoptimummoisturecontentmaybedeterminedusingdrydensityvaluesbasedonrapidmoisturecontenttestmethods.Usingthreecompactionpointsanddeterminingthemaximumdensitymathematicallywouldstillapply.However,therapidmoisturecontentmethodsmaygiveresultsthatdifferfromtheacceptedoven-driedmoisturecontentvaluesandwilllengthenthetimeofperformingthistestmethod.Note28212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod,theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthesetestmethodsarecautionedthatcompliancewithPracticeD3740doesnotinitselfensurereliableresults.Reliabletestingdependsonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethoddescribestheprocedureforrapidlydeterminingthepercentcompactionandthevariationfromoptimummoisturecontentofanin-placesoilforuseincontrollingconstructionofcompactedearth.Thesevaluesareobtainedbydevelopingathree-pointcompactioncurveatthesamemoisturecontentasthein-p......
【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