Designation:E1859/E1859M−11´1StandardTestMethodforFrictionCoefficientMeasurementsBetweenTireandPavementUsingaVariableSlipTechnique1ThisstandardisissuedunderthefixeddesignationE1859/E1859M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—EditoriallycorrectedunitsofmeasureformattinginNovember2013.1.Scope1.1Thistestmethodcoversthemeasurementofthelongi-tudinalfrictioncoefficientwithameasurementdevicethatimposesbraking-slipbetweenatireandasurfaceforthefullrangeofbraking-slipspeedvalues.1.2Thistestmethodutilizesaseriesofincrementalsinglemeasurementsoffrictionforceonabrakedtestwheelasitispulledoverawettedorcontaminatedpavementsurface.Therotationalvelocityofthebrakedwheelisfeedbackcontrolledinordertogiveapredeterminedvariableslipratiogradientinaccordancewithsetprogramparameters.Thetestwheeliskeptunderaconstantstaticnormalloadandataconstantlongitu-dinalspeedoftravel.Itsmajorplaneisperpendiculartotheroadplaneandparalleltoitsdirectionofmotion.1.3Thevaluesmeasuredrepresentthefrictionpropertiesobtainedwiththeequipmentandproceduresstatedinthistestmethodanddonotnecessarilyagreeorcorrelatedirectlywiththoseobtainedbyotherpavementfrictionmeasuringmethods.1.4Thevaluesareintendedforusein:1.4.1Evaluatingthebrakingfrictionforcesonapavementrelativetothatofotherpavements.1.4.2Evaluatingchangesinthebrakingfrictionforcesofaparticularpavementwiththepassageoftime.1.4.3Evaluatingthechangesinthebrakingfrictionforceofapavementwhensubjectedtopolishingwearandlossofmacrotexturecausedbytrafficwithpassageoftime.1.4.4Evaluatingchangesinthebrakingfrictionforcesofapavementcontaminatedwithice,moderateamounts2ofslushandsnow,pollen,vehicleoilspillsandcondensatesfromvehicleengineexhaust,anddepositsfromotherpollutionsources.1.4.5Evaluatingthebrakingfrictionforcesofaspecimentireonacleanorcont...
