1、Designation:E217711Standard Test Method forMeasuring the Coefficient of Retroreflected Luminance(RL)of Pavement Markings in a Standard Condition of Wetness1This standard is issued under the fixed designation E2177;the number immediately following the designation indicates the year oforiginal adoptio
2、n or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of the wetretroreflective(RL)properties of
3、 horizontal pavement markingmaterials,such as traffic stripes and road surface symbols,using a portable or mobile retroreflectometer that can be placedon or before the road marking to measure the retroreflection atthe prescribed geometry.1.2 This method of measuring the wet retroreflective prop-erti
4、es(RL)of pavement markings measures the wet retroreflec-tivity in a standard condition of wetness(see Fig.1).1.2.1 DiscussionThis test condition typically exists(1)after a rainfall has ended and the pavement markings are stillwet or(2)as the markings are wet from dew or humidity.1.3 Retroreflective
5、performance obtained with this test inconditions of wetness does not necessarily relate to howmarkings perform in conditions of rain,that is,as markings arebeing rained upon.NOTE1Test Method E2176 defines a method to use to measure theperformance of pavement markings in conditions of simulated rain.
6、1.4 This test method specifies the use of portable or mobilereflectometers that can measure pavement markings in accor-dance with Test Method E1710.2The entrance and observationangles required of the retroreflectometer in this test method arecommonly referred to as“30 meter geometry.”21.5 The values
7、 stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety an
8、d health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3B965 Specification for High Performance Tin-Coated An-nealed Copper Wire Intended for Electrical and ElectronicApplication for SolderabilityD6359 Specification for Min
9、imum Retroreflectance ofNewly Applied Pavement Marking Using Portable Hand-Operated Instruments(Withdrawn 2006)4E177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE1710 Test Method f
10、or Measurement of RetroreflectivePavement Marking Materials with CEN-Prescribed Ge-ometry Using a Portable RetroreflectometerE2176 Test Method for Measuring the Coefficient of Ret-roreflected Luminance of Pavement Markings in a Stan-dard Condition of Continuous Wetting(RL-Rain)(With-drawn 2013)42.2
11、Other Standard:CENEN 1436 Road Marking MaterialsRoad MarkingPerformance for Road Users53.Terminology3.1 coeffcient of retroreflected luminance,RL,nthe ratioof the luminance,L,of a projected surface to the normalilluminance,E,at the surface on a plane normal to the incidentlight,expressed in candelas
12、 per square metre per lux(cdm-2)/lx.Because of the low luminance of pavement markings,the units commonly used are millicandelas per square metreper lux(mcdm-2)/lx.1This test method is under the jurisdiction of ASTM Committee E12 on Colorand Appearance and is the direct responsibility of Subcommittee
13、 E12.10 onRetroreflection.Current edition approved June 1,2011.Published June 2011.Originallyapproved in 2001.Last previous edition approved in 2009 as E2177 01(2009).DOI:10.1520/E217711.2Reference ASTM E1710“Standard Test Method for Measurement of Retrore-flective Pavement Markings with CEN-Prescri
14、bed Geometry Using a PortableRetroreflectometer.”The standard measurement condition is intended to representthe angles corresponding to a distance of 30 m for the driver of a passenger car withan eye height of 1.2 m and a headlight height of 0.65 m above the road.SeeAppendix X1.3For referenced ASTM
15、standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.5Av
16、ailable from European Committee for Standardization(CEN),36 rue deStassart,B-1050,Brussels,Belgium,http:/www.cenorm.be.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 condition of wetness,nthe test condition is created byliberally wetting the road marking and waiting a certain timeperiod after wetting for water to run off.3.2.1 DiscussionSimilar conditions exist when road mark-ings are wet or damp such as typically found after a r
