ASTM_D_6243_-_D_6243M_-_20.pdf

Designation:D6243/D6243M20Standard Test Method forDetermining the Internal and Interface Shear Strength ofGeosynthetic Clay Liner by the Direct Shear Method1This standard is issued under the fixed designation D6243/D6243M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers a procedure for determining theinternal shear resistance of a geosynthetic clay liner(GCL)orthe interface shear resistance between the GCL and an adjacentmaterial under a constant rate of deformation.1.2 This test method is intended to indicate the performanceof the selected specimen by attempting to model certain fieldconditions.1.3 This test method is applicable to all GCLs.Remolded orundisturbed soil samples can be used in the test device.SeeTest Method D5321/D5321M for interface shear testing ofnon-GCL geosynthetics.See Guide D7702/D7702M for asummary of available information related to the evaluation ofdirect shear results obtained using this test method.1.4 This test method is not suited for the development ofexact stress-strain relationships within the test specimen due tothe nonuniform distribution of shearing forces and displace-ment.1.5 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system are not necessarily exact equivalents;therefore,toensure conformance with the standard,each system shall beused independently of the other,and values from the twosystems shall not be combined.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD698 Test Methods for Laboratory Compaction Character-istics of Soil Using Standard Effort(12,400 ft-lbf/ft3(600kN-m/m3)D1557 Test Methods for Laboratory Compaction Character-istics of Soil Using Modified Effort(56,000 ft-lbf/ft3(2,700 kN-m/m3)D2435/D2435M Test Methods for One-Dimensional Con-solidation Properties of Soils Using Incremental LoadingD2487 Practice for Classification of Soils for EngineeringPurposes(Unified Soil Classification System)D3080/D3080M Test Method for Direct Shear Test of SoilsUnder Consolidated Drained ConditionsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in Engineering Design and ConstructionD4439 Terminology for GeosyntheticsD5321/D5321M Test Method for Determining the ShearStrengthofSoil-GeosyntheticandGeosynthetic-Geosynthetic Interfaces by Direct ShearD6072/D6072M Practice for Obtaining Samples of Geosyn-thetic Clay LinersD6496/D6496M Test Method for Determining AverageBonding Peel Strength Between Top and Bottom Layersof Needle-Punched Geosynthetic Clay LinersD7005/D7005M Test Method for Determining the BondStrength(Ply Adhesion)of GeocompositesD7466/D7466M Test Method for Measuring AsperityHeight of Textured Geomembranes1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.04 on Geosyn-thetic Clay Liners.Current edition approved March 15,2020.Published March 2020.Originallyapproved in 1998.Last previous edition approved in 2016 as D6243/D6243M 16.DOI:10.1520/D6243_D6243M-20.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.D7702/D7702M Guide for Considerations When EvaluatingDirect Shear Results Involving Geosynthetics3.Terminology3.1 DefinitionsFor definitions of terms relating to soil androck,refer to Terminology D653.For definitions of termsrelating to GCLs,refer to Terminology D4439.3.2 Definitions of Terms Specific to This Standa