ASTM_D_6496_-_D_6496M_-_04a_2015e1.pdf

Designation:D6496/D6496M04a(Reapproved 2015)1Standard Test Method forDetermining Average Bonding Peel Strength Between Topand Bottom Layers of Needle-Punched Geosynthetic ClayLiners1This standard is issued under the fixed designation D6496/D6496M;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.1NOTEUnits information and designation were corrected editorially in July 2015.1.Scope1.1 This test method covers the laboratory determination ofthe average bonding strength between the top and bottomlayers of a sample of a geosynthetic clay liner(GCL).1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D76/D76M Specification for Tensile Testing Machines forTextilesD4439 Terminology for Geosynthetics3.Terminology3.1 Definitions:3.1.1 geosynthetic,na product manufactured wholly or inpart from polymeric material used with soil,rock,earth,orother geotechnical engineering related material as an integralpart of a project,structure,or system.D44393.1.2 geosynthetic clay liner,na manufactured hydraulicbarrier consisting of clay bonded to a layer or layers ofgeosynthetic material(s).(Currently being balloted under D35Committee on Terminology.)4.Summary of Test Method4.1 The top and bottom layers of a geosynthetic clay linerare gripped individually in tensile grips and pulled at a constantrate of extension by a tensile testing machine until the top andbottom layers of the specimen separate.The average bondingpeel strength of the test specimen can be calculated frommachine scales,dials,recording charts,or an interface com-puter.5.Significance and Use5.1 The bonding strength test for the top and bottom layersof the geosynthetic clay liner is intended to be an index test.Itis anticipated that the results of the test will be used to evaluatethe quality of the bonding process.6.Apparatus6.1 Tensile Testing MachineA constant rate of extension(CRE)type of testing machine described in SpecificationD76/D76M shall be used with a minimum precision measuringcapability of 0.1 N/m 5.71 104lbf/in.6.2 ClampsThe clamps shall be a minimum 25 by 100mm 1 by 4 in.and with appropriate clamping power toprevent slipping or crushing(damage).6.3 Die or Template,100 by 200 mm(61 mm)4 by 8 in.6.4 Miscellaneous,knives,razor,and the like,as required.7.Test Specimen7.1 The sample received at the testing laboratory should bein satisfactory condition and representative of the productmanufactured or delivered to a site,or both.7.2 The size of the die or template for cutting specimens is100 by 200 mm 4 by 8 in.1This 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 July 1,2015.Published July 2015.Originally approvedin 1999.Last previous edition approved in 2009 as D6496 04a(2009).DOI:10.1520/D6496_D6496M-04AR15E01.2For 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 States1 7.3 The loss of clay during the specimen cutting processshould have no bearing on the results of the test.7.4 A minimum of five test specimens should be cut fromthe laboratory sample such that they are representative of theentire roll width.All specimens should be parallel to themachine direction.8.Conditioning8.1 The test specimen shall be tested as received.9.Procedure9.1 Obtain SpecimensUsing the die,or template and razor,and other necessary apparatus,carefully cut from the labora-tory sample five test specimens.The five specimens should berandomly selected from locations on the sample,but should bedistributed across the sample.All specimens should be cutparallel to the machine direction.Using a knife or razor,separate the top and bottom layer of the GCL for the first50 6 3 mm 2 6 0.1 in.9.2 Machine Set-Up ConditionsAdjust the distance be-tween the clamps at the start of the test to 50 6 3 mm2 6 0.1 in.Set the CRE at 300 mm/min.12 in./min.9.3 Insertion of Specimen in