【英文标准名称】:StandardTestMethodforExpansionIndexofSoils
【原文标准名称】:土壤膨胀系数的标准试验方法
【标准号】:ASTMD4829-2008
【标准状态】:作废
【国别】:
【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(ASTM)
【起草单位】:D18.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:膨胀;土壤;测试
【英文主题词】:clays;expansivesoils;indextests;laboratorytests;soilmoisture;swellingsoils;
【摘要】:Theexpansionindex,EI,providesanindicationofswellingpotentialofacompactedsoil.TheEItestisnotusedtoduplicateanyparticularfieldconditionssuchassoildensity,watercontent,loading,in-placesoilstructure,orsoilwaterchemistry.However,consistenttestconditionsareusedinpreparationofcompactedspecimenssuchthatdirectcorrelationofdatacanbemadebetweenorganizations.Note1&8212;QualitativeclassificationofpotentialexpansioninasoilbasedonEIisprovidedinTable1.Note2&8212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod:Theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgencieswhichmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetenttesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotensurereliabletesting.Reliabletestingdependsonseveralfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.TABLE1ClassificationofPotentialExpansionofSoilsUsingEIAverageExpansionIndex
StandardDeviation(1slimit)
DifferenceTwo-Standard-DeviationLimit(d2slimit)
56
11
30
76
14
39
77
18
50