ASTM D4632-2008 土工织物的断裂荷载和延伸度的标准试验方法

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【英文标准名称】:StandardTestMethodforGrabBreakingLoadandElongationofGeotextiles
【原文标准名称】:土工织物的断裂荷载和延伸度的标准试验方法
【标准号】:ASTMD4632-2008
【标准状态】:现行
【国别】:美国
【发布日期】:2008
【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;Geosynthetics;Grabtest;Strength--geosynthetics;Tensileproperties/testing--geosynthetics
【摘要】:Thegrabmethodisapplicablewheneveritisdesiredtodeterminethex201C;effectivestrengthx201D;ofthefabricinuse,thatis,thestrengthofthematerialinaspecificwidth,togetherwiththeadditionalstrengthcontributedbyadjacentmaterial.Thereisnosimplerelationshipbetweengrabtestsandstriptestssincetheamountoffabricassistancedependsontheconstructionofthefabric.Itisusefulasaqualitycontroloracceptancetest.TheprocedureinTestMethodD4632forthedeterminationofgrabstrengthofgeotextilesmaybeusedforacceptancetestingofcommercialshipments,butcautionisadvisedsinceinformationaboutbetween-laboratoryprecisionisincomplete.Comparativetestsasdirectedin5.2.1areadvisable.IncaseofadisputearisingfromdifferencesinreportedtestresultswhenusingtheproceduresinTestMethodD4632foracceptancetestingofcommercialshipments,thepurchaserandthemanufacturershouldconductcomparativeteststodetermineifthereisastatisticalbiasbetweentheirlaboratories.Competentstatisticalassistanceisrecommendedfortheinvestigationofbias.Asaminimum,thetwopartiesshouldtakeagroupoftestspecimensthatareashomogeneousaspossibleandwhicharefromalotofmaterialofthetypeinquestion.Thetestspecimensshouldthenberandomlyassignedinequalnumberstoeachlaboratoryfortesting.TheaverageresultsfromthetwolaboratoriesshouldbecomparedusingtheappropriateStudent''st-testandanacceptableprobabilitylevelchosenbythetwopartiesbeforetestingisbegun.Ifabiasisfound,eitheritscausemustbefoundandcorrectedorthepurchaserandthemanufacturermustagreetointerpretfuturetestresultsinthelightoftheknownbias.Mostgeotextilefabricscanbetestedbythistestmethod.Somemodificationofclampingtechniquesmaybenecessaryforagivenfabric,dependinguponitsstructure.Specialadaptationmaybenecessarywithstrongfabrics,orfabricsmadefromglassfibers,topreventthemfromslippingintheclampsorbeingdamagedasaresultofbeinggrippedintheclamps,suchascushioningtheclamporboardingthespecimenwithintheclamp.Thistestmethodisapplicablefortestingfabricseitherdryorwet.Itmaybeusedwithconstant-rate-of-traverse(CRT)orconstant-rate-of-extension(CRE)typetensionmachines.However,theremaybenooverallcorrelationbetweentheresultsobtainedwiththeCRTmachineandtheCREmachine.Consequently,thesetwotensiontesterscannotbeusedinterchangeably.Incaseofcontroversy,theCREmachineshallprevail.1.1Thistestmethodisanindextestwhichprovidesaprocedurefordeterminingthebreakingload(grabstrength)andelongation(grabelongation)ofgeotextilesusingthegrabmethod.Thistestmethodisnotsuitableforknittedfabricsandalternatetestmethodsshouldbeused.Whileusefulforqualitycontrolandacceptancetestingforaspecificfabricstructure,theresultscanonlybeusedcomparativelybetweenfabricswithverysimilarstructures,becauseeachdifferentfabricstructureperformsinauniqueandcharacteristicmannerinthistest.Thegrabtestmethodsdoesnotprovidealltheinformationneededforalldesignapplicationsandothertestmethodsshouldbeused.1.2Proceduresformeasuringthebreakingloadandelongationbythegrabmethodinboththedryandwetstateareincluded;however,testingisnormallydoneinthedryconditionunlessspecifiedotherwiseinanagreementorspecification.1.3ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesstatedininch-poundunitsareprovidedforinformationonly.1.4Thisstanda......
【中国标准分类号】:W59
【国际标准分类号】:59_080_70
【页数】:4P.;A4
【正文语种】:英语