Designation:D425−88(Reapproved2008)StandardTestMethodforCentrifugeMoistureEquivalentofSoils1ThisstandardisissuedunderthefixeddesignationD425;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofthemois-tureequivalentofsoilinthelaboratorybymeansofacentrifugetechnique.1.2Thistestmethodislimitedtodisturbedspecimensofcoarse-grainedsoilshavingfinesoflowplasticitysuchasSP,SW,SC-SM,orSMsoils.Thetestislimitedtosoilspassingthe2.00-mmsieveorthatfractionofasoilpassinga2.00-mmsieve.NOTE1—TestMethodD3152orTestMethodD2325shouldbeusedtoevaluatethecapillary-moisturerelationsoffine-grainedsoilsandcoarse-grainedsoilshavingfinesofmediumtohighplasticity,undisturbedsoils,andsoilsatspecificdesiredunitsweights.1.3Thetestmethodistemperature-dependent,andconsis-tentcomparableresultscanbeobtainedonlyifthetestsareperformedunderaconstant-temperaturecondition.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D653TerminologyRelatingtoSoil,Rock,andContainedFluidsD2216TestMethodsforLaboratoryDeterminationofWater(Moisture)ContentofSoilandRockbyMassD2325TestMethodforCapillary-MoistureRelationshipsforCoarse-andMedium-TexturedSoilsbyPorous-PlateApparatus(Withdrawn2007)3D3152TestMethodforCapillary-MoistureRelationshipsforFine-TexturedSoilsbyPressure-MembraneApparatus(Withdrawn2007)3D4753GuideforEvaluating,Selecting,andSpecifyingBal-ancesandStandardMassesforUseinSoil,Rock,andConstructionMaterialsTestingE11SpecificationforWovenWireTestSieveClothandTestSieves3.Terminology...
