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【英文标准名称】:StandardTestMethodforDispersiveCharacteristicsofClaySoilbyDoubleHydrometer
【原文标准名称】:用双倍流体比重计测定粘土的分散特性的试验方法
【标准号】:ASTMD4221-1999(2005)
【标准状态】:现行
【国别】:
【发布日期】:1999
【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】:D18.06
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:瓷土;试验设备;施工材料;试验;建筑;土壤;分散;流体比重计;特性
【英文主题词】:clays;deflocculation;dispersion;dispersiveclay;erosion;gradation;hydrometeranalysis;jugging;particlesize;piping
【摘要】:Dispersiveclaysarethosewhichnormallydeflocculatewhenexposedtowateroflow-saltconcentration,theoppositeofaggregatedclaysthatwouldremainflocculatedinthesamesoil-watersystem(3,4,7).Generally,dispersiveclaysarehighlyerosive,possiblysubjecttohighshrink-swellpotential,mayhavelowershearstrength,andhavelowerpermeabilityratesthanaggregatedclays.Availabledata(1)indicatesthatthetestmethodhasabout85%relianceinpredictingdispersiveperformance(85%ofdispersiveclaysshowmorethan35%dispersion).Sincethistestmethodmaynotidentifyalldispersiveclays,designdecisionsbasedsolelyonthistestmethodmaynotbeconservative.Itisoftenruninconjunctionwiththecrumbtest(4,7),thepinholetestgiveninTestMethodD4647,ortheanalysisofporewaterextract(4,7),orcombinationthereof,toidentifypossibledispersiveclaybehavior.Note18212;Notwithstandingthestatementonprecisionandbiascontainedinthistestmethod;theprecisionofthistestmethodisdependentonthecompetenceofthepersonalperformingit,andthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfensurereliabletesting.Reliabletestingdependsonseveralfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.1.1Thistestmethod,whenusedinconjunctionwithatestperformedbyTestMethodD422onaduplicatesoilsample,providesanindicationofthenaturaldispersivecharacteristicsofclaysoils().1.2Thistestmethodisapplicableonlytosoilswithaplasticityindexgreaterthan4asdeterminedinaccordancewithTestMethodD4318andmorethan12%ofthesoilfractionfinerthan5-masdeterminedinaccordancewithTestMethodD422().1.3ThistestmethodissimilartoTestMethodD422,exceptthatthismethodcoversthedeterminationofpercentofsoilparticlessmallerthan5-mindiameterinasoil-watersuspensionwithoutmechanicalagitationandtowhichnodispersingagenthasbeenadded.1.4Theamountofparticlessmallerthan5-mdeterminedbythismethodcomparedwiththetotalamountofparticlessmallerthan5-mdeterminedbyTestMethodD422isameasureofthedispersivecharacteristicsofthesoil.1.5Thistestmethodmaynotidentifyalldispersiveclaysoils.Pinholes(TestMethodD4647andcrumbtests,orboth,()ortheanalysisofporewaterextract()maybeperformedtohelpverifydispersion.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:N51
【国际标准分类号】:
【页数】:3P.;A4
【正文语种】:


【英文标准名称】:LongshanktapswithnominaldiametersfromM3toM24and1/8into1in-Reducedshanktaps
【原文标准名称】:公称直径从M3～M24和1/8英寸～1英寸的长柄机用丝锥-缩柄丝锥
【标准号】:ISO2283-2000
【标准状态】:现行
【国别】:国际
【发布日期】:2000-03
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC29
【标准类型】:()
【标准水平】:()
【中文主题词】:工具;直径;尺寸;轴;钻头;柄;标准直径;丝锥;机用丝锥
【英文主题词】:Diameter;Dimensions;Drills;Machinescrewingtaps;Nominaldiameters;Shafts;Taps(threading);Tools
【摘要】:ThisInternationalStandardspecifiesthedimensionsforreducedshanktapswithnominaldiametersfromM3toM24and1/8into1inandthuscomplementsISO8051whichconcernsfull-diametershanktaps.Itappliestolongshankmachinetaps.TechnicalspecificationsfortapscoveredbythisInternationalStandard(includingmarking)aregiveninISO8830.ThisInternationalStandardisapplicabletotapsintendedforcuttingthefollowingthreads:a)ISOmetricthreads—coarsepitch;—finepitch.b)ISOinchthreads—"UnifiedCoarse"series(UNC)and"UnifiedFine"series(UNF).Thefollowingnon-recommendedinchthreads—"BritishStandardWhitworth"(BSW)and"BritishStandardFine"(BSF);—"BritishAssociation"(BA)aregiveninAnnexA.
【中国标准分类号】:J41
【国际标准分类号】:25_100_50
【页数】:7P.;A4
【正文语种】:英语