Designation:D6918−09(Reapproved2022)StandardTestMethodforTestingVerticalStripDrainsintheCrimpedCondition1ThisstandardisissuedunderthefixeddesignationD6918;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodisaperformancetestthatmeasurestheeffectcrimpinghasontheabilityofverticalstripdrainstotransmitwaterparalleltotheplaneofthedrain.1.2Thistestmethodisapplicabletoallverticalstripdrains.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4354PracticeforSamplingofGeosyntheticsandRolledErosionControlProducts(RECPs)forTestingD4439TerminologyforGeosynthetics3.Terminology3.1Definitions:3.1.1Forgeneralgeosyntheticstermsusedinthistestmethod,refertoTerminologyD4439.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1verticalstripdrain,n—ageocompositeconsistingofageotextilecoveranddrainagecoreinstalledverticallyintosoiltoprovidedrainageforacceleratedconsolidationofsoils.4.SummaryofTestMethod4.1Thistestmethodpresentstwomethodsfordeterminingtheeffectofacrimpformingintheverticalstripdrainduetotheconsolidationofsoilsarounditinthefield.4.1.1Averticalstripdrainissealedinawaterproofmem-branetopreventanywaterfromescapingoutthroughthegeo...
