Designation:D2325–68(Reapproved2000)StandardTestMethodforCapillary-MoistureRelationshipsforCoarse-andMedium-TexturedSoilsbyPorous-PlateApparatus1ThisstandardisissuedunderthefixeddesignationD2325;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthedeterminationofcapillary-moisturerelationshipsforcoarse-andmedium-texturedsoilsasindicatedbythesoil-moisturetensionrelationsfortensionsbetween10and101kPa(0.1and1atm).Underequilibriumconditions,moisturetensionisdefinedastheequivalentnegativegagepressure,orsuction,correspondingtoasoilmoisturecontent.Thistestmethoddeterminestheequilibriummoisturecontentretainedinasoilsubjectedtoagivensoil-watertension.Thistestmethodisnotsuitableforveryfine-texturedsoils.NOTE1—Fordeterminationofcapillary-moisturerelationshipsforfine-texturedsoils,refertoTestMethodD3152.1.2Thisstandarddoesnotpurporttoaddressallofthesafetyproblems,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D421PracticeforDryPreparationofSoilSamplesforParticle-SizeAnalysisandDeterminationofSoilCon-stants2D698TestMethodforLaboratoryCompactionCharacter-isticsofSoilusingStandardEffort(12,400ft–lbf/ft3(600kN·m/m3))D3152TestMethodforCapillary-MoistureRelationshipsforFine-TexturedSoilsbyPressure-MembraneAppara-tus23.SummaryofTestMethod3.1Saturatedsoilsamplesareplacedincontactwithasaturatedporousplateinstalledwithinapressurechamber.Thebottomofeachplateiscoveredbyarubbermembrane,orotherwisesealedtobeairtight.Thebottomofeachplateismaintainedatatmosphericpressurebymeansofasmalldraintubeoropeningthroughthesideofthepressurechamber.Adesiredairpressureadmittedtothepressurechamber,an...
