ASTM_E_2367_-_05_2014.pdf

Designation:E236705(Reapproved 2014)Standard Test Method forMeasurement of Nighttime Chromaticity of PavementMarking Materials Using a Portable RetroreflectionColorimeter1This standard is issued under the fixed designation E2367;the number immediately following the designation indicates the year oforiginal adoption 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 measurement of the nighttimechromaticity coordinates(x,y)of horizontal pavementmarkings,such as traffic stripes and surface symbols,using aportable retroreflection colorimeter that can be placed on theroad delineation to measure the chromaticity at a prescribedgeometry.1.2 The entrance and observation angles of the retrorecolo-rimeter affect the readings.As specified by the EuropeanCommittee for Standardization(CEN EN 1436),the entranceand observation angles shall be 88.76 and 1.05,respectively.1.3 This test method is intended to be used for fieldmeasurement of pavement markings but may be used tomeasure the chromaticity of materials on sample panels beforeplacing the marking material in the field.1.4 The portable retroreflection colorimeter may integratemeasurement of the coefficient of retroreflected luminance RLin accordance with Test Method E1710 and thus be anintegrated retroreflectometer/retroreflection colorimeter.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D6628 Specification for Color of Pavement Marking Mate-rialsE284 Terminology of AppearanceE308 Practice for Computing the Colors of Objects by Usingthe CIE SystemE811 Practice for Measuring Colorimetric Characteristics ofRetroreflectors Under Nighttime ConditionsE1710 Test Method for Measurement of RetroreflectivePavement Marking Materials with CEN-Prescribed Ge-ometry Using a Portable Retroreflectometer2.2 Other Standard:CEN EN 1436 Road Marking MaterialsRoad MarkingPerformance for Road Users33.Terminology3.1 The terminology used in this test method generallyagrees with that used in Terminology E284.The definitionsgiven in Test Method E1710 and Practice E811 apply in thistest method as well.3.2 Definitions:3.2.1 reflection colorimeter,nan instrument that illumi-nates a specimen and applies a colorimeter to the lightreflected.3.2.2 retroreflection colorimeter,na reflection colorimeterfor which the illumination(influx)and reception(efflux)directions are within a few degrees of each other.4.Summary of Test Method4.1 This test method involves the use of portable retrore-flection colorimeters for determining the chromaticity coordi-nates(x,y)of horizontal coatings materials used in pavementmarkings.4.2 The entrance angle is fixed at 88.76(co-entrance anglee of 1.24).4.3 The observation angle is fixed at 1.05(co-viewingangle a of 2.29).4.4 The presentation angle shall be 0(azimuthal angle b of180).1This test method is under the jurisdiction of ASTM Committee E12 on Colorand Appearance and is the direct responsibility of Subcommittee E12.10 onRetroreflection.Current edition approved Jan.1,2014.Published January 2014.Originallyapproved in 2005.Last previous edition approved in 2005 as E2367 05.DOI:10.1520/E2367-05R14.2For 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 European Committee for Standardization(CEN),AvenueMarnix 17,B-1000,Brussels,Belgium,http:/www.cen.eu.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.5 The retroreflection colorimeters use one or more exter-nal panels or other instrument standards of known chromaticitycoordinates(x,y),or known spectral distribution of reflectedpower PSi.4.6 The portable retroreflection colorimeter is placed so thatthe measurement area of the retroreflection colorimeter fitswithin the width of the stripe,and the readings displayed by theretroreflection colorimeter are recorded.4.7 Readings shall be taken for the direction of traffic(supplementary azimuthal angle d of 0).Readings shall betaken for each direction of traffic separately for centerlines.5.Significance and Use5.1 The chromaticity of the stripe is determined by means ofthe tristimulus values X,Y and Z for the CIE 1931(2)standardobserver for CIE standard illuminantA,which are converted tothe chromaticity coordinates(x,y)and shown in the CIE 1931(x,y)-chromaticity diagram.Refer to Practice E308.5.2 Under the same conditions of illumination and viewing,the chromaticity coord