【英文标准名称】:StandardTestMethodforMaximumMediaDensityforDeadLoadAnalysisofGreenRoofSystems
【原文标准名称】:新暴露顶层系统静荷载分析用最大介质密度的标准试验方法
【标准号】:ASTME2399-2005
【标准状态】:现行
【国别】:
【发布日期】:2005
【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】:E60.01
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:分析;试验;屋顶系统;密度;屋顶;恒荷载;介质;新的
【英文主题词】:greenroof;maximumdensity;media;waterpermeability;waterretention
【摘要】:Thistestmethoddescribessimplelaboratorymethodsthatprovidereproduceablemeasurementsofcriticalmediaproperties,andpermitdirectcomparisonstobemadebetweendifferentmediamaterials.Thedensityofmixedmediamaterialswillvarydependingonthedegreetowhichtheyaresubjectedtocompactionandthelengthoftimethatthematerialisallowedtohydrateandsubsequentlydrain.Mostgreenroofmediamaterialshavealargecapacitytoabsorbandretainmoisture.Furthermore,moisturewilldraingraduallyfromthemediafollowingahydrationcycle.Themaximummediadensitymeasuredinthisprocedureapproachesthedensityatthetheoreticalsaturationpoint.Existingmethodsformeasuringthecapillary-moisturerelationshipforsoils(TestMethodD2325)relyonsamplepreparationprocedures(TestMethodsD698)thatarenotconsistentwiththeconditionsassociatedwiththeplacementofgreenroofmediamaterials.Thisprocedureisintendedtoprovideareproduciblelaboratoryprocedureforpredictingthemaximummediadensity,moisturecontent,andwaterpermeabilityunderconditionsthatmorecloselyreplicatefieldconditionsongreenroofs.Thevalueofthistestmethodtothegreenroofdesigneristhatitprovidesanobjectivemeasureofmaximumprobablemediadensity(underdrainedconditions)forestimatingstructuralloads.Italsoprovidesamethodforestimatingthelowerlimitforthewaterpermeabilityofthein-placemedia.Thislattervalueisimportantwhenconsideringdrainageconditionsingreenroofs.Finally,themaximummediawaterretentionhasbeenshowntobeausefulindicatorofthemoistureretentionpropertiesofgreenroofmedia.1.1Thistestmethodcoversaprocedurefordeterminingthemaximummediadensityforpurposesofestimatingthemaximumdeadloadforgreenroofassemblies.Themethodalsoprovidesameasureofthemoisturecontentandthewaterpermeabilitymeasuredatthemaximummediadensity.1.2Thisprocedureissuitableforgreenroofmediathatcontainnomorethan30%organicmaterialasmeasuredusingthelossonignitionprocedureTestMethodsF1647,MethodA.1.3Themaximummediadensityandassociatedmoisturecontentmeasuredinthisprocedureappliestodrainedconditionsnearthesaturationpoint.1.4Thetestmethodisintendedtoemulateverticalpercolationratesforwateringreenroofs.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesandtodeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:P32
【国际标准分类号】:91_060_20
【页数】:4P.;A4
【正文语种】: