Designation:D4186/D4186M−20´1StandardTestMethodforOne-DimensionalConsolidationPropertiesofSaturatedCohesiveSoilsUsingControlled-StrainLoading1ThisstandardisissuedunderthefixeddesignationD4186/D4186M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—Sectionreferencesin10.1wereeditoriallycorrectedinApril2021.1.Scope*1.1Thistestmethodisforthedeterminationofthemagni-tudeandrate-of-consolidationofsaturatedcohesivesoilsusingcontinuouscontrolled-strainaxialcompression.Thespecimenisrestrainedlaterallyanddrainedaxiallytoonesurface.Theaxialforceandbaseexcesspressurearemeasuredduringthedeformationprocess.Controlledstraincompressionistypicallyreferredtoasconstantrate-of-strain(CRS)testing.1.2Thistestmethodprovidesforthecalculationoftotalandeffectiveaxialstresses,andaxialstrainfromthemeasurementofaxialforce,axialdeformation,chamberpressure,andbaseexcesspressure.Theeffectivestressiscomputedusingsteadystateequations.1.3Thistestmethodprovidesforthecalculationofthecoefficientofconsolidationandthehydraulicconductivitythroughouttheloadingprocess.Thesevaluesarealsobasedonsteadystateequations.1.4Thistestmethodmakesuseofsteadystateequationsresultingfromatheoryformulatedunderparticularassump-tions.Subsection5.5presentstheseassumptions.1.5ThebehaviorofcohesivesoilsisstrainratedependentandhencetheresultsofaCRStestaresensitivetotheimposedrateofstrain.Thistestmethodimposeslimitsonthestrainratetoprovidecomparableresultstotheincrementalconsolidationtest(TestMethodD2435).1.6Thedeterminationoftherateandmagnitudeofconsoli-dationofsoilwhenitissubjectedtoincrementalloadingiscoveredbyTestMethodD2435.1.7Thistestmethodappliestointact(GroupCandGroupDofPracticeD4220),remolded,orlaboratoryreconstitutedsamples.1.8Thistestmethodismostoftenusedformaterialsofrelativelylowhydraulicconductivity...
