Designation:D7760−18StandardTestMethodforMeasurementofHydraulicConductivityofMaterialsDerivedfromScrapTiresUsingaRigidWallPermeameter1ThisstandardisissuedunderthefixeddesignationD7760;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverslaboratorymeasurementofthehydraulicconductivity(alsoreferredtoascoeffıcientofper-meability)ofwater-saturatedsamplesobtainedfrommaterialsderivedfromscraptiresusingarigid-wallpermeameter.Thescraptirematerialscoveredinthismethodincludetirechips,tireshreds,andtirederivedaggregate(TDA)asdescribedinPracticeD6270withparticlesizesrangingfromapproximately12to305mm.Wholescraptiresarenotincludedinthisstandard.Acleartrendbetweenhydraulicconductivityandshredsizehasnotbeenestablishedatagivenverticalpressureforshreds≥50mm(1).21.2Asingle-ordual-ringpermeametermaybeusedinthetests.Adual-ringpermeametermaybepreferredoverasingle-ringpermeametertotakeintoaccountandpreventshort-circuitingofpermeantalongthesidewallsoftheper-meameter.Theeffectsofsidewallflowismoresignificantathighstressesandwhenthecelldiameterislessthan6timestheparticlesize(1).1.3Thetestmethodisusedunderconstantheadconditions.1.4Waterisusedasthepermeantwiththetestmethod.1.5TestMethodD2434alsocanbeusedfordeterminationofhydraulicconductivityofmaterialsderivedfromscraptireswithsizessmallerthan19mmunderconstantheadconditionsinarigid-wallpermeameter.MethodD2434includestheuseofapermeameterwithasinglering.1.6ThevaluesstatedinSIunitsaretoberegardedasthestandard.Hydraulicconductivityhastraditionallybeenex-pressedincm/sintheUS,eventhoughtheofficialSIunitforhydraulicconductivityism/s.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmental...
