1、Designation:D406113(Reapproved 2018)Standard Test Method forRetroreflectance of Horizontal Coatings1This standard is issued under the fixed designation D4061;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 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 describes the instrumental measure-ment of the retroreflective properties of horizontal surfacingmaterials,such as traffi
3、c stripe paint systems,traffic tapes,andtraffic surface symbols.1.2 Specimen preparation,size,and shape must be deter-mined and specified by the user of this test method.Likewise,the user must specify the observation and entrance angles to beused(see Fig.1).1.3 The geometric requirements of this tes
4、t method arebased on materials for which the relative retroreflectancechanges less than approximately 50%over the observationangle range from 0.2 to 0.5.This is illustrated in Fig.2.1.4 This test method is a laboratory test and requires afacility that can be darkened sufficiently so that stray light
5、 doesnot affect the test results.This facility must be capable ofhousing the required 15-m test distance.1.5 The values 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,
6、if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.7 This international standard was developed in accor-dance with internatio
7、nally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2E284 Terminolo
8、gy of AppearanceE308 Practice for Computing the Colors of Objects by Usingthe CIE SystemE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE808 Practice for Describing RetroreflectionE809 Practice for Measuring Photometric Characteristics ofRetroreflector
9、s2.2 CIE Publication:3No.54 Retroreflection Definition and Measurement3.Terminology3.1 The terms and definitions in Terminology E284 apply tothis test method.3.2 Definitions:3.2.1 coeffcient of retroreflected luminance,RL,nratio ofthe luminance,L,of a projected surface to the normalilluminance,E,at
10、the surface on a plane normal to theincident light,expressed in candelas per square metre per lux(cdm2lx1).RL5L/E!(1)3.2.2 datum mark,nin retroreflection,an indication on theretroreflector that is used to define the orientation of theretroreflector with respect to rotation about the retroreflectorax
11、is.3.2.2.1 DiscussionThe datum mark must not lie on theretroreflector axis.3.2.3 entrance angle,nin retroreflection,angle betweenthe illumination axis and the retroreflector axis.3.2.3.1 DiscussionFor plane retroreflective surfaces,theentrance angle is no larger than 90.1This test method is under th
12、e jurisdiction of ASTM Committee E12 on Colorand Appearance and is the direct responsibility of Subcommittee E12.10 onRetroreflection.Current edition approved Oct.1,2018.Published October 2018.Originallyapproved in 1989.Last previous edition approved in 2013 as D4061 13.DOI:10.1520/D4061-13R18.2For
13、referenced ASTM 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.3Available from U.S.National Committee of the CIE(International Commiss
14、ionon Illumination),C/o Thomas M.Lemons,TLA-Lighting Consultants,Inc.,7 PondSt.,Salem,MA 01970,http:/www.cie-usnc.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with international
15、ly recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.3.2 DiscussionThe entrance angle may be divided intoco
16、mponents 1and 2.This is described in Practice E808.Inthis test method only the component 1is used.Therefore,where only the entrance angle is specified the conventionused is 2=0 and 1=.3.2.4 illumination axis,nin retroreflection,a line from theeffective center of the source aperture to the retroreflectorcenter.3.2.5 normal illuminance,Ethe illuminance on a retrore-flective surface measured in the plane that passes through theretroreflector center and is perpendicular to the illuminationaxis;measu