Designation:D5970−09StandardTestMethodforDeteriorationofGeotextilesfromOutdoorExposure1ThisstandardisissuedunderthefixeddesignationD5970;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversevaluatingthedeteriorationintensilestrengthandstrainafteroutdoorexposure.1.2Thedeteriorationisassessedasareductioninstrengthandstrainatfailurefromtheunexposedgeotextile.1.3Thespecificlocationofthelightandweatherexposureismadeonthebasisofasitespecificdecisionbetweenthepartiesinvolved.1.4ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4439TerminologyforGeosyntheticsD5035TestMethodforBreakingForceandElongationofTextileFabrics(StripMethod)3.Terminology3.1Fordefinitionsoftermsrelatedtogeosynthetics,refertoTerminologyD4439.3.2Definitions:3.2.1ultravioletdegradation—thephotochemicalchangeinducedbyexposuretoultravioletradiationthatresultsindeteriorationoftheperformancecharacteristicsofthepoly-mericstructure.4.SummaryofTestMethod4.1Geotextilecouponsareattachedtoatestframeoriented45°fromthehorizontalandfacingtheequatoratdesignatedlocationforexposuretimesof1,2,4,8,12,and18months.Exposureshallbeginsoastoensurethatmaterialisexposedduringthemaximumintensityofultravioletlightoftheyear.4.1.1Unexposedcontrolcouponsshallberetainedfortesting.4.2Aftereachexposuretimetheappropriatecouponsarebroughtintoalaboratoryforstrengthdetermination.Theresultsofthesetestsarecomparedtothestrengthdeterminedfortheunexposedcoupons.Theusermaybe...
