Designation:D6528−17StandardTestMethodforConsolidatedUndrainedDirectSimpleShearTestingofFineGrainSoils1ThisstandardisissuedunderthefixeddesignationD6528;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethoddefinesequipmentspecificationsandtestingproceduresforthemeasurementofconstantvolumestrengthandstress-straincharacteristicsofcohesivesoilsafterone-dimensionalconsolidationusingaconstantrateofsimplesheardeformationmodeofloading.Theconstantvolumeconditionisequivalenttotheundrainedconditionforsaturatedspecimens.1.2Thistestmethodiswrittenspecificallyfordevicesthattestrectangularparallelepipedorcylindricalspecimens.Othermoregeneraldevices,suchasthetorsionalshearhollowcylinder,maybeusedtoperformconsolidatedconstantvolumesimplesheartestsbutarebeyondthescopeofthistestmethod.1.3Thistestmethodisapplicabletotestingintact,labora-toryreconstituted,andcompactedsoils,however,itdoesnotincludespecificguidanceforreconstitutingorcompactingtestspecimens.1.4Itshallbetheresponsibilityoftheagencyrequestingthistesttospecifythemagnitudeoftheverticalconsolidationstresspriortoconstantvolumeshearand,whenappropriate,themaximumverticalconsolidationstress,whichwillresultinanoverconsolidatedspecimen.1.5Units—ThevaluesstatedinSIunitsaretoberegardedasthestandard.Nootherunitsofmeasurementareincludedinthisstandard.ReportingoftestresultsinunitsotherthanSIshallnotberegardedasnonconformancewiththistestmethod.1.5.1Intheengineeringprofessionitiscustomarypracticetouse,interchangeably,unitsrepresentingbothmassandforce,unlessdynamiccalculations(F=Ma)areinvolved.Thisimplic-itlycombinestwoseparatesystemsofunits,thatis,theabsolutesystemandthegravimetricsystem.Itisscientificallyundesirabletocombinetwoseparatesystemswithinasinglestandard.ThistestmethodhasbeenwrittenusingSIunits;howev...
