【英文标准名称】:U-coresofsoftmagneticferrite,typeUI46
【原文标准名称】:软磁铁芯.U形铁芯.UI46型
【标准号】:DIN41296T.6-1977
【标准状态】:作废
【国别】:
【发布日期】:
【实施或试行日期】:
【发布单位】:德国标准化学会(DE-DIN)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:
【国际标准分类号】:
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【英文标准名称】:StandardPracticeforClassificationofSoilsforEngineeringPurposes(UnifiedSoilClassificationSystem)
【原文标准名称】:工程用土壤分类的标准实施规程(统一土壤分类法)
【标准号】:ASTMD2487-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D18.07
【标准类型】:(Classification)
【标准水平】:()
【中文主题词】:
【英文主题词】:Atterberglimits;classification;clay;gradation;gravel;laboratoryclassification;organicsoils;sand;silt;soilclassification;soiltests;Atterberglimits;Clay;Coarse-grainedsoil;Erosioncontrolmaterials/applications;Fine-grainedsoil;Grada
【摘要】:Thisstandardclassifiessoilsfromanygeographiclocationintocategoriesrepresentingtheresultsofprescribedlaboratoryteststodeterminetheparticle-sizecharacteristics,theliquidlimit,andtheplasticityindex.Theassigningofagroupnameandsymbol(s)alongwiththedescriptiveinformationrequiredinPracticeD2488canbeusedtodescribeasoiltoaidintheevaluationofitssignificantpropertiesforengineeringuse.Thevariousgroupingsofthisclassificationsystemhavebeendevisedtocorrelateinageneralwaywiththeengineeringbehaviorofsoils.Thisstandardprovidesausefulfirststepinanyfieldorlaboratoryinvestigationforgeotechnicalengineeringpurposes.ThisstandardmayalsobeusedasanaidintrainingpersonnelintheuseofPracticeD2488.ThisstandardmaybeusedincombinationwithPracticeD4083whenworkingwithfrozensoils.Note58212;Notwithstandingthestatementsonprecisionandbiascontainedinthisstandard:Theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgenciesthatmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetentandobjectivetesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotinitselfassurereliabletesting.Reliabletestingdependsonseveralfactors;PracticeD3740providesameansforevaluatingsomeofthosefactors.1.1Thispracticedescribesasystemforclassifyingmineralandorgano-mineralsoilsforengineeringpurposesbasedonlaboratorydeterminationofparticle-sizecharacteristics,liquidlimit,andplasticityindexandshallbeusedwhenpreciseclassificationisrequired.Note18212;Useofthisstandardwillresultinasingleclassificationgroupsymbolandgroupnameexceptwhenasoilcontains5to12%finesorwhentheplotoftheliquidlimitandplasticityindexvaluesfallsintothecrosshatchedareaoftheplasticitychart.Inthesetwocases,adualsymbolisused,forexample,GP-GM,CL-ML.Whenthelaboratorytestresultsindicatethatthesoilisclosetoanothersoilclassificationgroup,theborderlineconditioncanbeindicatedwithtwosymbolsseparatedbyaslash.Thefirstsymbolshouldbetheonebasedonthisstandard,forexample,CL/CH,GM/SM,SC/CL.Borderlinesymbolsareparticularlyusefulwhentheliquidlimitvalueofclayeysoilsiscloseto50.Thesesoilscanhaveexpansivecharacteristicsandtheuseofaborderlinesymbol(CL/CH,CH/CL)willalerttheuseroftheassignedclassificationsofexpansivepotential.1.2Thegroupsymbolportionofthissystemisbasedonlaboratorytestsperformedontheportionofasoilsamplepassingthe3-in.(75-mm)sieve(seeSpecificationE11).1.3Asaclassificationsystem,thisstandardislimitedtonaturallyoccurringsoils.Note28212;Thegroupnamesandsymbolsusedinthistestmethodmaybeusedasadescriptivesystemappliedtosuchmaterialsasshale,claystone,shells,crushedrock,etc......
【中国标准分类号】:P13
【国际标准分类号】:93_020
【页数】:11P.;A4
【正文语种】:英语