Designation:D6918−09(Reapproved2014)´1StandardTestMethodforTestingVerticalStripDrainsintheCrimpedCondition1ThisstandardisissuedunderthefixeddesignationD6918;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditorialchangesweremadethroughoutinMarch2014.1.Scope1.1Thistestmethodisaperformancetestthatmeasurestheeffectcrimpinghasontheabilityofverticalstripdrainstotransmitwaterparalleltotheplaneofthedrain.1.2Thistestmethodisapplicabletoallverticalstripdrains.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4354PracticeforSamplingofGeosyntheticsandRolledErosionControlProducts(RECPs)forTestingD4439TerminologyforGeosynthetics3.Terminology3.1Definitions:3.1.1Forgeneralgeosyntheticstermsusedinthistestmethod,refertoTerminologyD4439.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1verticalstripdrain,n—ageocompositeconsistingofageotextilecoveranddrainagecoreinstalledverticallyintosoiltoprovidedrainageforacceleratedconsolidationofsoils.4.SummaryofTestMethod4.1Thistestmethodpresentstwomethodsfordeterminingtheeffectofacrimpformingintheverticalstripdrainduetheconsolidationofsoilsarounditinthefield.4.1.1Averticalstripdrainissealedinawaterproofmem-branetopreventanywaterfromescapingoutthroughthegeotextileduringthetest.4.1.2Thesealedverticalstripdrainisplacedintheappro-priatecrimpingdeviceandwaterisallowedtopassthroughitunderaconstantheadofwater.4.1.3Acrimpisplacedonthespecimen,andwaterallowedtopassthroughitunderaconstantheadinthecrimpedc...
