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【英文标准名称】:StandardTestMethodforTensilePropertiesofGeotextilesbytheWide-WidthStripMethod
【原文标准名称】:用宽带法测试土工合成织物拉伸特性的标准试验方法
【标准号】:ASTMD4595-2009
【标准状态】:现行
【国别】:美国
【发布日期】:2009
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D35.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:Breakingstrength/tenacity;Elongation--geotextiles;Embankments;Felt;Geosynthetics;Knittedtextilefabrics;Loadingtests--geosynthetics;Nonwovengeotextilefabrics;Reinforcedgeomembranes;Secantmodulus;Slope;Tensileproperties/testing--geosynth
【摘要】:Thedeterminationofthewide-widthstripforcex2212;elongationpropertiesofgeotextilesprovidesdesignparametersforreinforcementtypeapplications,forexampledesignofreinforcedembankmentsoversoftsubgrades,reinforcedsoilretainingwalls,andreinforcementofslopes.Whenstrengthisnotnecessarilyadesignconsideration,analternativetestmethodmaybeusedforacceptancetesting.TestMethodD4595forthedeterminationofthewide-widthstriptensilepropertiesofgeotextilesmaybeusedfortheacceptancetestingofcommercialshipmentsofgeotextilesbutcautionisadvisedsinceinformationaboutbetween-laboratoryprecisionisincomplete(Note7).Comparativetestsasdirectedin5.1.1maybeadvisable.IncasesofadisputearisingfromdifferencesinreportedtestresultswhenusingTestMethodD4595foracceptancetestingofcommercialshipments,thepurchaserandthesuppliershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofbias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimenswhichareashomogeneousaspossibleandwhicharefromalotofmaterialofthetypeinquestion.Thetestspecimensshouldthenberandomlyassignedinequalnumberstoeachlaboratoryfortesting.TheaverageresultsfromthetwolaboratoriesshouldbecomparedusingStudent''st-testforunpaireddataandanacceptableprobabilitylevelchosenbythetwopartiesbeforethetestingbegan.Ifabiasisfound,eitheritscausemustbefoundandcorrectedorthepurchaserandthesuppliermustagreetointerpretfuturetestresultsinthelightoftheknownbias.Mostgeotextilescanbetestedbythistestmethod.Somemodificationofclampingtechniquesmaybenecessaryforagivengeotextiledependinguponitsstructure.Specialclampingadaptionsmaybenecessarywithstronggeotextilesorgeotextilesmadefromglassfiberstopreventthemfromslippingintheclampsorbeingdamagedasaresultofbeinggrippedintheclamps.Specimenclampingmaybemodifiedasrequiredatthediscretionoftheindividuallaboratoryprovidingarepresentativetensilestrengthisobtained.Inanyevent,theproceduredescribedinSection10ofthistestmethodforobtainingwide-widthstriptensilestrengthmustbemaintained.Thistestmethodisapplicablefortestinggeotextileseitherdryorwet.Itisusedwithaconstantrateofextensiontypetensionapparatus.Theuseoftensilestrengthtestmethodsthatrestricttheclampedwidthdimensionto50mm(2in.)orless,suchastheravel,cutstrip,andgrabtestprocedures,havebeenfoundlesssuitablethanthistestmethodfordeterminingdesignstrengthparametersforsomegeotextiles.Thisisparticularlythecasefornonwovengeotextiles.Thewide-widthstriptechniquehasbeenexploredbytheindustryandisrecommendedinthesecasesforgeotextileapplications.Thistestmethodmaynotbesuitedforsomewovenfabricsusedingeotextileapplicationsthatexhibitstrengthsapproximately100kN/mor600lbf/in.duetoclampingandequipmentlimitations.Inthosecases,100-mm(4-in.)widthspecimensmaybesubstitutedfor200-mm(8-in.)widthspecimens.Onthosefabrics,thecontractioneffectcitedin1.4isminimaland,consequently,thestandardcomparisoncancontinuetobemade.1.1Thistestmethodcoversthemeasurementoftensilepropertiesofgeotextilesusingawide-widthstripspecimentensilemethod.Thistestmethodisapplicabletomostgeotextilesthatincludewovenfabrics,nonwovenfabrics,layeredfabrics,knitfabrics,andfeltsthatareusedforgeotextileapplication.1.2Thistestmethodcoversthemeasurementoftensilestrengthand......
【中国标准分类号】:W59
【国际标准分类号】:59_080_70
【页数】:12P.;A4
【正文语种】:英语