【英文标准名称】:StandardTestMethodforCBR(CaliforniaBearingRatio)ofSoilsinPlace
【原文标准名称】:现场测定土壤加利福尼亚承载比的标准试验方法
【标准号】:ASTMD4429-2009a
【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】:D18.08
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:bearingratio;CBR;deflection;flexiblepavement;CBR(Californiabearingratio);Soil
【摘要】:Fieldin-placeCBRtestsareusedforevaluationanddesignofflexiblepavementcomponentssuchasbaseandsubbasecourseandsubgradesandforotherapplications(suchasunsurfacedroads)forwhichCBRisthedesiredstrengthparameter.IfthefieldCBRistobeuseddirectlyforevaluationordesignwithoutconsiderationforvariationduetochangeinwatercontent,thetestshouldbeconductedunderoneofthefollowingconditions:(a)whenthedegreeofsaturation(percentageofvoidsfilledwithwater)is80%orgreater,(b)whenthematerialiscoarsegrainedandcohesionlesssothatitisnotsignificantlyaffectedbychangesinwatercontent,or(c)whenthesoilhasnotbeenmodifiedbyconstructionactivitiesduringthetwoyearsprecedingthetest.Inthelast-namedcase,thewatercontentdoesnotactuallybecomeconstant,butgenerallyfluctuateswithinarathernarrowrange.Therefore,thefieldin-placetestdatamaybeusedtosatisfactorilyindicatetheaverageload-carryingcapacity.Anyconstructionactivities,suchasgradingorcompacting,carriedoutsubsequenttothebearingratiotestwillprobablyinvalidatetheresultsofthetest.Soilsandflexiblepavementcomponentsatthesamelocationmayexhibitsignificantlydifferentloaddeflectionrelationships.Nomethodpresentlyexiststoevaluatetheprecisionofagroupofnon-repetitiveplateloadtestsonsoilsandflexiblepavementcomponentsduetothevariabilityofthesematerials.Note18212;Fieldin-placetestsareusedtodeterminetherelativestrengthofsoils,subbase,andsomebasematerialsintheconditionatwhichtheyexistatthetimeoftesting.Suchresultshavedirectapplicationintestsectionworkandinsomeexpedientconstruction,military,orsimilaroperations.Also,asindicatedin4.1,fieldin-placetestscanbeusedfordesignunderconditionsofnominalstabilityofwater,density,andgeneralcharacteristicsofthematerialtested.However,anysignificanttreating,disturbing,handling,compaction,orwaterchangecanaffectthesoilstrengthandmakethepriortotestdeterminationinapplicable,leadingtotheneedforretestandreanalysis.Note28212;Notwithstandingthestatementsonprecisionandbiascontainedinthisstandard:Theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgencieswhichmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthismethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliabletesting.Reliabletestingdependsonmanyfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1ThistestmethodcoversthedeterminationoftheCaliforniaBearingRatio(CBR)ofsoiltestedinplacebythepenetrationloadofthesoil.Thistestmethodcoverstheevaluationoftherelativequalityofsubgradesoils,butisapplicabletosubbaseandsomebase-coursematerials.Thistestmethodisdesignedtotestin-situmaterialsandcorrespondstoTestMethodD1883.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefor......
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:7P.;A4
【正文语种】:英语
基本信息
标准名称: | 锆及锆合金化学分析方法 苯甲酰苯基羟胺分光光度法测定钒量 |
英文名称: | Zirconium and zirconium alloys-Determination of vanadium content-N-benzoyl-N-phenylhydroxylamine spectrophotometric method |
中标分类: |
冶金 >>
金属化学分析方法 >>
稀有金属及其合金分析方法 |
ICS分类: |
冶金 >>
有色金属 >>
镉、钴及其合金
|
发布部门: | 国家技术监督局 |
发布日期: | 1992-01-01 |
实施日期: | 1993-06-01 |
首发日期: | 1992-11-05 |
作废日期: | 1900-01-01 |
主管部门: | 中国有色金属工业协会 |
提出单位: | 中国有色金属工业总公司 |
归口单位: | 全国有色金属标准化技术委员会 |
起草单位: | 西北有色金属研究院 |
起草人: | 陈觉 |
出版社: | 中国标准出版社 |
出版日期: | 1993-06-01 |
页数: | 3页 |
适用范围
本标准规定了锆及锆合金中钒含量的测定方法。
本标准适用于锆及锆合金中钒含量的测定。
前言
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引用标准
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所属分类: 冶金 金属化学分析方法 稀有金属及其合金分析方法 冶金 有色金属 镉 钴及其合金