Designation:E2157−15StandardTestMethodforMeasuringPavementMacrotexturePropertiesUsingtheCircularTrackMeter1ThisstandardisissuedunderthefixeddesignationE2157;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1ThistestmethodcoverstheprocedureforobtainingandanalyzingpavementmacrotextureprofilesusingtheCircularTrackMeter(CTMeter).1.2TheCTMeterconsistsofachargecoupleddevice(CCD)laserdisplacementsensorthatismountedonanarmthatrotatessuchthatthedisplacementsensorfollowsacirculartrackhavingadiameterof284mm.1.3TheCTMeterisdesignedtomeasurethesamecirculartrackthatismeasuredbytheDynamicFrictionTester(DFTester).1.4TheCTMetercanbeusedbothforlaboratoryinvesti-gationsandinthefieldonactualpavedsurfaces.1.5ThesoftwaredevelopedfortheCTMeterreportsthemeanprofiledepth(MPD)andtherootmeansquare(RMS)valuesofthemacrotextureprofiles.1.6ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.7Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2E867TerminologyRelatingtoVehicle-PavementSystemsE1845PracticeforCalculatingPavementMacrotextureMeanProfileDepthE1911TestMethodforMeasuringPavedSurfaceFrictionalPropertiesUsingtheDynamicFrictionTester2.2OtherDocument:Manufacturer’s“OperatingManualfortheCircularTextureMeter”33.Terminology3.1SeeTerminologyE867.3.2Definitions:3.2.1negativetexture,n—macrotextureproducedbyde-pressionsinthesurface.3.2.2positivetexture,n—macrotextureproducedbyasperi-tiesprojectingabovethesurface.4.SummaryofTestMethod4.1Thistestmethodusesadisplacementsensorthatismountedonanarmthatrotatesclo...
