ASTM_D_7056_-_07_2012.pdf

Designation:D705607(Reapproved 2012)Standard Test Method forDetermining the Tensile Shear Strength of Pre-FabricatedBituminous Geomembrane Seams1This standard is issued under the fixed designation D7056;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method presents the procedures used fordetermining the quality of prefabricated bituminous geomem-brane(PBGM)bonded seams subjected to a shear test.Itdescribes a destructive quality control test used to determinethe integrity of PBGM seams.1.2 This test procedure is intended for PBGM only.1.3 The type of thermal field seaming technique used toconstruct PBGM seams include the following.1.3.1 Torch-onThis technique melts two PBGM surfacesto be seamed by running a flame from a propane torch betweenthem.Pressure is applied on the top or bottom,or both PBGM,forcing together both surfaces to form a continuous bond.1.3.2 Hot AirThis technique introduces high-temperatureair or gas between two PBGM surfaces to facilitate melting.Pressure is applied on the top or bottom,or both PBGM,forcing together both surfaces to form a continuous bond.1.4 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:2D638 Test Method for Tensile Properties of PlasticsD5199 Test Method for Measuring the Nominal Thicknessof GeosyntheticsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 geomembrane,nan essentially impermeable geosyn-thetic composed of one or more synthetic sheets.3.1.2 geosynthetic,na planar product manufactured frombitumen or polymeric material used with soil,rock,earth orother geotechnical engineering related material as an integralpart of a man-made project,structure or system.3.1.3 geotextile,nany permeable textile material used infoundation,soil,rock,earth,or any other geotechnical engi-neering related material,as an integral part of a man madeproject,structure,or system.3.1.4 Prefabricated Bituminous Geomembrane(PBGM),na material fabricated in a plant and consisting principally ofnon-woven polyester textile,impregnated by a blend of oxi-dized or polymer-modified bitumen incorporating filler.3.1.5 Quality assurance,nall planned and systematicactions necessary to provide adequate confidence that an itemor a facility will perform satisfactorily in service.3.1.6 Quality control,nthe operational techniques and theactivities,which sustain a quality of material,product,system,or service that will satisfy given needs;also the use of suchtechniques and activities.4.Significance and Use4.1 The use of PBGM as barrier materials to restrict liquidmigration from one location to another in soils has created aneed for a standard test method to evaluate the quality ofPBGM seams.In the case of PBGM,it has become evident thatseams can exhibit separation in the field under certain condi-tions.Although this is an index type test method used forquality assurance and quality control purposes,it is alsointended to provide the quality assurance engineer with suffi-cient seam shear data to evaluate seam quality.Recording andreporting data will allow the quality assurance engineer to takemeasures necessary to ensure the repair of seams with unac-ceptable strength during facility construction,and therefore,minimize the potential for seam separation in service.5.Apparatus5.1 Tensile instrumentation shall meet the requirementsoutlined in Test Method D638.1This test method is under the jurisdiction of ASTM Committee D35 onGeosynthetics and is the direct responsibility of Subcommittee D35.10 on Geomem-branes.Current edition approved Feb.1,2012.Published April 2012.Originallyapproved in 2004.Last previous edition approved in 2007 as D7056 07.DOI:10.1520/D7056-07R12.2For 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 5.2 Grip FacesGrip faces shall be a minimum of 50 mm(2 in.)wide and a minimum of 50 mm(2 in.)in length.Smoothrubber,fine serrated or coarse serrated grip faces have all beenfound to be suitable for testing PBGM.If needed,the use of asilicone-coated paper to help holding the PBGM specimenends into the grips is recommended The silicone-coated side isto be used in contact wi