ASTM E2302-2003a(2009) 用便携式反射计测量路面标记材料在漫射照明时发光系数的标准试验方法

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【英文标准名称】:StandardTestMethodforMeasurementoftheLuminanceCoefficientUnderDiffuseIlluminationofPavementMarkingMaterialsUsingaPortableReflectometer
【原文标准名称】:用便携式反射计测量路面标记材料在漫射照明时发光系数的标准试验方法
【标准号】:ASTME2302-2003a(2009)
【标准状态】:现行
【国别】:美国
【发布日期】:2003
【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】:E12.10
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:pavement;pavementmarkings;portablereflectometers;reflection;CEN(ComiteEuropeendeNormalization);Diffuseillumination;Luminance;Pavementmarkingmaterials;Portablereflectometer;Reflectometer/reflectrometry
【摘要】:Thequalityofthestripeforvisibilityindaylightorunderroadlightingisdeterminedbytheluminancecoefficientunderdiffuseillumination,Qd,anddependsonthematerialsused,age,andwearpattern.Theseconditionsshallbeobservedandnotedbytheuser.Underthesameconditionsofilluminationandviewing,higherlevelsofQdcorrespondtohigherlevelsoflightness.Reflectivityofpavement(road)markingsdegradewithtrafficwearandrequireperiodicmeasurementtoensurethatsufficientlinevisibilityisprovidedtodrivers.Foragivenviewingdistance,measurementsofQdmadewithareflectometerhavingageometrycorrespondingtothatdistanceareagoodindicatorofthevisualrankingofmaterialmeasured.specifiedbyCEN,themeasurementgeometryoftheinstrumentisbasedonaviewingdistanceof30mandaneyeheightof1.2m.Itshallbetheresponsibilityoftheusertoemployaninstrumenthavingthespecifiedco-viewingangle.1.1Thistestmethodcoversmeasurementoftheluminancecoefficientunderdiffuseilluminationofhorizontalpavementmarkings,suchastrafficstripesandsurfacesymbols,andpavementsurfaces,inaparticularviewingdirectionusingaportablereflectometer.Note18212;Theluminancecoefficientunderdiffuseilluminationisameasureofthereflectionofhorizontalpavementmarkingsandpavementsurfacesinaparticularviewingdirectionindaylightorunderroadlighting.Diffuseilluminationapproximatesdaylightilluminationfromtheovercastsky,androadlightingasanaverageoflocationsonthepavementsurface.1.2Theco-viewingangleofthereflectometeraffectsthereadings.AsspecifiedbytheEuropeanCommitteeforStandardization(CEN),theco-viewingangleshallbe2.29x00B0;.1.3Thistestmethodisintendedtobeusedforfieldmeasurementofpavementmarkingsandpavementsurfacesbutmaybeusedtomeasuretheperformanceofmaterialsonsamplepanelsbeforeplacingthemarkingmaterialinthefield.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:Q85
【国际标准分类号】:93_080_20
【页数】:7P.;A4
【正文语种】:英语