【英文标准名称】:Roadvehicles.Roofloadcarrierdevices.Part3:specificpurposeroofdevices.
【原文标准名称】:道路车辆.顶部负载装置.第3部分:专用顶部装置
【标准号】:NFR18-903-3-1996
【标准状态】:作废
【国别】:法国
【发布日期】:1996-10-01
【实施或试行日期】:1996-10-20
【发布单位】:法国标准化协会(AFNOR)
【起草单位】:
【标准类型】:()
【标准水平】:()
【中文主题词】:
【英文主题词】:
【摘要】:
【中国标准分类号】:T20
【国际标准分类号】:43_040_60
【页数】:34P;A4
【正文语种】:其他


【英文标准名称】:StandardPracticeforDeterminingtheNumberofConstrictions"m"ofNon-WovenGeotextilesasaComplementaryFiltrationProperty
【原文标准名称】:利用补充过滤特性测定无纺织织物结构"m"数的标准实施规程
【标准号】:ASTMD7178-2006
【标准状态】:现行
【国别】:
【发布日期】:2006
【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】:D35.03
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:测定;过滤;土工织物;无纺织织物;数;财产
【英文主题词】:clogging;constriction;filtration;geotextile;mechanicallybonded;non-woven;numberofconstrictions;openingsize;piping
【摘要】:Thispracticeprovidesacalculationmethodfordeterminingthenumberofconstrictionsmofanon-wovengeotextile(orofalayerofacompositematerial).Thisstandardisnotapplicabletowovengeotextiles,knittedgeotextiles,heat-bondedgeotextilesoranyothertypeofgeosynthetic.Thenumberofconstrictionrepresentsthenumberofx201C;windowsx201D;delimitedbythreeormorefibers,inwhichsoilparticlescouldmigrate.Inthatregard,itcanbebasicallydefinedbythefollowingequation:wheretisthethicknessanddctheaveragedistancebetweentwoconstrictions.Thisvaluehasbeenfoundtoberelevanttoexplainthedifferentfiltrationbehaviorsofnon-wovengeotextileswithsimilaropeningsizesbutdifferentstructuresforvarioussoilconditions(seeAppendixX1fordetails).Thisvaluewillbeusedinfiltrationresearchtoevaluatethepredictionoffiltrationefficiencyandeffectivenessofvariousnon-wovengeotextileswithsimilaropeningsizes(TestMethodD6767).Interpretationofthesignificanceofmascalculatedusingthisstandardshallbedonewithcareassomenon-wovenstructuresmaynotreflectthehypothesisusedtoestablishtheproposedequation(seeAppendixX1fordetails).1.1Thispracticedescribestheprocedureusedalongwithexistingtestmethodtodeterminethenumberofconstrictionsmofmechanicallybondednon-wovengeotextiles,basedonthickness,massperunitareaandfiberproperties1.2Thenumberofconstrictionsisapropertyofnon-wovengeotextiles,whichiscomplementarytoopeningsizetopredicttheirfiltrationbehavior.Itcanbeusedtodifferentiatenon-wovengeotextileswithsimilaropeningsizesbutdifferentstructures(thickness,weight,fiberdiameter,etc.).However,moreresearchisneededtoassessitssignificancewhencomparingtwoproductswithdifferentopeningsizes.1.3Considerationofthenumberofconstrictionisrelevantinfiltrationapplicationswherepipingorcloggingconcernsaretobecontrolledwithahighlevelofconfidence,thatis,forfiltersapplicationsincriticalsoils.1.4Thisstandardisfordesignpurposesonlyandisnotintendedforqualitycontrolpurposes.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【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】: