【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
基本信息
| 标准名称： | 液压舵机技术要求 |
| 中标分类： |
船舶 >>
舾装设备 >>
甲板机械 |
| 发布日期： | |
| 实施日期： | 1965-11-17 |
| 首发日期： | |
| 作废日期： | |
| 出版日期： | |
| 页数： | 6页 |
适用范围
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前言
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目录
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引用标准
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所属分类： 船舶 舾装设备 甲板机械