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【英文标准名称】:StandardPracticeforEvaluatingRetroreflectivePavementMarkingsUsingPortableHand-OperatedInstruments
【原文标准名称】:使用便携式手动仪器评估反射路标的标准实施规程
【标准号】:ASTMD7585/D7585M-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【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】:D04.38
【标准类型】:(Practice)
【标准水平】:()
【中文主题词】:
【英文主题词】:pavementmarkings;retroreflection
【摘要】:Thispracticeprovidesproceduresforthedeterminationoftheretroreflectiveperformanceofpavementmarkings.Thispracticedoesnotsettheminimumretroreflectancevaluesforpavementmarkings,itdescribessamplingcriteriafordeterminingtheretroreflectivepropertiesofpavementmarkings,whichthencanbeusedtodeterminecompliancewithaspecification.Itistheresponsibilityoftheagencyhavingjurisdictiontosettheacceptableretroreflectivityvalueswithintheirownspecifications.Thispracticedoesnotpurporttoaddressalltheconcernsregardingcontaminationofthemarkings,butthefollowingmaybehelpful.Itisveryimportantthatthemarkingsbeingevaluatedarecleananddry.Iftheevaluationisbeingusedrelativetoameasureoftheperformanceofacontractor,itisimperativethatthepartiesagreebeforehandonthedefinitionofcleananddry.Therearemanyformsofcontaminationonaroadwaythatwilllowertheretroreflectivityreadingsofamarking,butnotallofthemcanberemoved.Asphaltoilandrubberskidmarksareexamples.Loosedirtcanberemovedbypressurewashing,perhapsusingsoap,brushingorhigh-pressureair,however,thesetechniquesareusuallyinsufficienttoremovedirtthatispackedintothemarkingsurface.Careshouldbetakentoselectareasthataretypicalofthemarkingsection,avoidingareasofpainttrackingorcontamination,forexample.Itmaybeusefultotakephotographsusingadigitalcameraandagoodmacrolenstobeabletoseethecontaminationonorbetweentheglassbeads.1.1Thispracticedescribesseveralfieldtechniquestoevaluatetheretroreflectivepropertiesofpavementmarkingscontainingretroreflectingoptics(forexample,centerlinesandedgelines)andappliedtotheroadsurface.Thetechniquesdescribedinthispracticecontainsamplingcriteriasuchasthelengthoftestsectionsandthenumberofmeasurementsneeded.Thepracticeisbasedonretroreflectivemeasurementsmadewithportablehand-operatedinstrumentsincompliancewithTestMethodE1710.1.2Thedataobtainedfromthispracticecanbeusedtodeterminetheacceptanceorrejectionofaprojectbasedonspecifiedlevelsofretroreflectivityestablishedbytheagencyhavingjurisdiction.1.3Thispracticecanbeusedfortheevaluationofnewlyinstalledorexistingpavementmarkings.Whentestingnewlyappliedpavementmarkings,itisrecommendedthattheevaluationbedonenosoonerthan48hoursafterapplicationbutbefore30daysafterapplicationsothatexcessretroreflectiveoptics,suchasglassspheres,arenolongerpresent.1.4Theassessmenttechniquesinthispracticearebasedonbestpracticesanddesignedtoprovidethreelevelsofconfidenceintermsofquantifyingtheretroreflectiveperformanceofmarkings.Eachtechniquerepresentsatradeoffbetweenthenumberofmeasurementsandtheconfidenceoftheretroreflectiveperformanceofthemarkingsunderstudy.1.5Thispracticecanbeusedbyagenciesasisormaybecustomizedtomeetanagencyx2019;sspecificneeds.Whereapplicable,thepracticedescribesareaswheredifferentassumptionscouldbemade,whichwouldimpactthesamplingneedsandtheconfidencelevelsoftheresults.Whendeviationsfromthispracticearemade,theyshallbedocumentedinthetestreport.Note18212;Whenmeasuringnewlyinstalledpavementmarkings,thereareseveralfactorsthatcontributetoerroneousvaluesformeasurementsmadewithinashorttimeafterapplication,sucha......
【中国标准分类号】:Q85
【国际标准分类号】:93_080_20
【页数】:6P.;A4
【正文语种】:英语