Designation:D6243/D6243M−20StandardTestMethodforDeterminingtheInternalandInterfaceShearStrengthofGeosyntheticClayLinerbytheDirectShearMethod1ThisstandardisissuedunderthefixeddesignationD6243/D6243M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversaprocedurefordeterminingtheinternalshearresistanceofageosyntheticclayliner(GCL)ortheinterfaceshearresistancebetweentheGCLandanadjacentmaterialunderaconstantrateofdeformation.1.2Thistestmethodisintendedtoindicatetheperformanceoftheselectedspecimenbyattemptingtomodelcertainfieldconditions.1.3ThistestmethodisapplicabletoallGCLs.Remoldedorundisturbedsoilsamplescanbeusedinthetestdevice.SeeTestMethodD5321/D5321Mforinterfacesheartestingofnon-GCLgeosynthetics.SeeGuideD7702/D7702Mforasummaryofavailableinformationrelatedtotheevaluationofdirectshearresultsobtainedusingthistestmethod.1.4Thistestmethodisnotsuitedforthedevelopmentofexactstress-strainrelationshipswithinthetestspecimenduetothenonuniformdistributionofshearingforcesanddisplace-ment.1.5ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTr...
