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【英文标准名称】:StandardTestMethodforExpansionIndexofSoils
【原文标准名称】:土壤的膨胀系数的标准试验方法
【标准号】:ASTMD4829-2008a
【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】:D18.05
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:clays;expansivesoils;indextests;laboratorytests;soilmoisture;swellingsoils;Compactionmeasurement--soils;Dimensionalchange;Distilledwater;Expansionindex(EI);Saturation;Soil;Specimenpreparation(fortesting)--soil;Thickness;Wate
【摘要】:Theexpansionindex,EI,providesanindicationofswellingpotentialofacompactedsoil.TheEItestisnotusedtoduplicateanyparticularfieldconditionssuchassoildensity,watercontent,loading,in-placesoilstructure,orsoilwaterchemistry.However,consistenttestconditionsareusedinpreparationofcompactedspecimenssuchthatdirectcorrelationofdatacanbemadebetweenorganizations.Note18212;QualitativeclassificationofpotentialexpansioninasoilbasedonEIisprovidedinTable1.Note28212;Notwithstandingthestatementsonprecisionandbiascontainedinthistestmethod:Theprecisionofthistestmethodisdependentonthecompetenceofthepersonnelperformingitandthesuitabilityoftheequipmentandfacilitiesused.AgencieswhichmeetthecriteriaofPracticeD3740aregenerallyconsideredcapableofcompetenttesting.UsersofthistestmethodarecautionedthatcompliancewithPracticeD3740doesnotensurereliabletesting.Reliabletestingdependsonseveralfactors;PracticeD3740providesameansofevaluatingsomeofthosefactors.TABLE1ClassificationofPotentialExpansionofSoilsUsingEIExpansionIndex,EI
PotentialExpansion
0x2013;20
VeryLow
21x2013;50
Low
51x2013;90
Medium
91x2013;130
High
>130
VeryHigh