【英文标准名称】:StandardTestMethodforDeterminationofWater(Moisture)ContentofSoilbyMicrowaveOvenHeating
【原文标准名称】:微波炉法测定土壤中含水量的标准试验方法
【标准号】:ASTMD4643-2008
【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】:microwave;microwavemoisture;microwaveoven;moisturecontent;rapidmoisturetest;watercontent;Backfill--testing;Earthwork;Embankments;Fieldtesting--soil;Massperunitvolume;Microwaveovens/procedures;Ovens;Soil-aggregate;Soil-moisture
【摘要】:Thewatercontentofasoilisusedthroughoutgeotechnicalengineeringpracticebothinthelaboratoryandinthefield.TheuseofTestMethodD2216forwatercontentdeterminationcanbetimeconsumingandthereareoccasionswhenamoreexpedientmethodisdesirable.Theuseofamicrowaveovenisonesuchmethod.Theprincipalobjectiontotheuseofthemicrowaveovenforwater-contentdeterminationhasbeenthepossibilityofoverheatingthesoil,therebyyieldingawatercontenthigherthanwouldbedeterminedbyTestMethodD2216.Whilenoteliminatingthispossibility,theincrementaldryingproceduredescribedinthistestmethodwillminimizeitseffects.Somemicrowaveovenshavesettingsatlessthanfullpower,whichcanalsobeusedtoreduceoverheating.Thebehaviorofasoil,whensubjectedtomicrowaveenergy,isdependentonitsmineralogicalcompositions,andasaresultnooneprocedureisapplicableforalltypesofsoil.Therefore,theprocedurerecommendedinthistestmethodismeanttoserveasaguidewhenusingthemicrowaveoven.ThistestmethodisbestsuitedforminusNo.4sizedmaterial.Largersizeparticlescanbetested;however,caremustbetakenbecauseoftheincreasedchanceofparticleshattering.Theuseofthismethodmaynotbeappropriatewhenhighlyaccurateresultsarerequired,orthetestusingthedataisextremelysensitivetomoisturevariations.Duetothelocalizedhightemperaturesthatthespecimenisexposedtoinmicrowaveheating,thephysicalcharacteristicsofthesoilmaybealtered.Degregationofindividualparticlesmayoccur,alongwithvaporizationorchemicaltransition.Itisthereforerecommendedthatsamplesusedinthistestmethodnotbeusedforothertestssubsequenttodrying.Note18212;Thequalityoftheresultsproducedbythistestmethodisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfensurereliableresults.Reliableresultsdependonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethodoutlinesproceduresfordeterminingthewater(moisture)contentofsoilsbyincrementallydryingsoilinamicrowaveoven.1.2ThistestmethodcanbeusedasasubstituteforTestMethodD2216whenmorerapidresultsaredesiredtoexpediteotherphasesoftestingandslightlylessaccurateresultsareacceptable.1.3WhenquestionsofaccuracybetweenthistestmethodandTestMethodD2216arise,TestMethodD2216shallbetherefereemethod.1.4Thistestmethodisapplicableformostsoiltypes.Forsomesoils,suchasthosecontainingsignificantamountsofhalloysite,mica,montmorillonite,gypsumorotherhydratedmaterials,highlyorganicsoils,orsoilsinwhichtheporewatercontainsdissolvedsolids(suchassaltinthecaseofmarinedeposits),thistestmethodmaynotyieldreliablewatercontentvalues.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Nootherunitsofmeasurementareincludedinthistestmethod.1.6RefertoPracticeD6026forguidanceconcerningtheuseofsignificantfigures.Thisisespeciallyimportantifthewatercontentwillbeusedtocalculateotherrelationshipssuchasmoistmasstodrymassorviceversa,wetunitweighttodryunitweightorvicevers......
【中国标准分类号】:B11
【国际标准分类号】:13_080_40
【页数】:6P.;A4
【正文语种】:英语
基本信息
标准名称: | 汽车 牵引车与全挂车机械连接装置 强度试验 |
英文名称: | Motor vehicles-Drawbar couplings and eyes for hinged drawbars-Strength test |
中标分类: |
车辆 >>
汽车底盘与车身 >>
承载系统 |
ICS分类: |
道路车辆工程 >>
道路车辆装置 >>
传动装置、悬挂装置
|
替代情况: | 被GB/T 15087-2009代替 |
发布部门: | 国家技术监督局 |
发布日期: | 1994-05-31 |
实施日期: | 1995-01-01 |
首发日期: | 1994-05-31 |
作废日期: | 2010-01-01 |
主管部门: | 国家发展和改革委员会 |
归口单位: | 全国汽车标准化技术委员会 |
起草单位: | 中国汽车技术中心 |
出版社: | 中国标准出版社 |
出版日期: | 1995-01-01 |
页数: | 平装16开, 页数:4, 字数:4千字 |
适用范围
本标准规定了牵引车与全挂车机械连接装置的强度要求和试验方法。本标准适用于符合GB 4781规定的机械连接装置。
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引用标准
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所属分类: 车辆 汽车底盘与车身 承载系统 道路车辆工程 道路车辆装置 传动装置 悬挂装置