Designation:D7272−06(Reapproved2018)StandardTestMethodforDeterminingtheIntegrityofSeamsUsedinJoiningGeomembranesbyPremanufacturedTapedMethods1ThisstandardisissuedunderthefixeddesignationD7272;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethoddescribesdestructivequalitycontroland/orqualityassuranceteststodeterminetheintegrityofseamsproducedusingtapedseamingmethods.Thistestmethodpresentstheproceduresusedfordeterminingthequalityoftapedseamssubjectedtobothpeelandsheartests.Thesetestproceduresareintendedfornonreinforcedandreinforcedgeomembranes.1.2Thetypesoftapeseamingtechniquesusedtoconstructgeomembraneseamsincludethefollowing:1.2.1InseamTape—Thistechniquerequiresthemembranetobeoverlappedaminimumdistance.Thetopsheetisfoldedbackandboththebottomsheetandthetopsheetareprimedwithanadhesiveprimer.Theprimerisallowedtoflashoff.Thetapeadhesiveisappliedtothebottomsheetsothataminimumofthetapewillextendoutfromunderthetopsheetwhenlaidoverthetape.Thetopsheetisallowedtolayflatoverthetapeandthereleasepaperisremovedbypullingitata45to90degreeangle,keepingthereleasepaperflattothesurfaceofthebottomsheet.Theseamareaisthenrolledwithasilicone-sleevedroller.1.2.2CoverStripTape—Thistechniquerequiresthemem-branetobeoverlappedaminimumdistance.Anareaeithersideoftheseamedgeisprimed.Theprimerisallowedtoflashoff.Thecoverstripisappliedwiththeadhesivesidedown,centeredoverthetopsheetedgewhileremovingthereleasepaperasitproceedsalongcenteredovertheedgeofthetopsheet.Thecoverstripisthenrolledwithasilicone-sleevedroller.1.3Fornondestructivetestmethods,seePracticeD4437/D4437M.1.4Thistestmethodisapplicableforseamingprocessesthatusetapeadhesiveasaseamingmechanism.1.5Subsequentdecisionsastoseamacceptancecriteriaaremadeaccordingtothesite-specificcontractplans,specifications,andcon...
