tire-noise

ReportNo.CDOT-DTD-R-2004-5COLORADODOTTIRE/PAVEMENTNOISESTUDYDouglasI.HansonRobertS.JamesApril2004DISCLAIMERThecontentsofthisreportreflecttheviewsoftheauthorswhoareresponsibleforthefactsandaccuracyofthedatapresentedherein.ThecontentsdonotnecessarilyreflecttheofficialviewsorpoliciesoftheColoradoDepartmentofTransportationortheNationalCenterforAsphaltTechnology.Thisreportdoesnotconstituteastandard,specificationorregulation.TechnicalReportDocumentationPage1.ReportNo.CDOT-DTD-R-2004-52.GovernmentAccessionNo.3.Recipient’sCatalogNo.5.ReportDateApril20044.TitleandSubtitleCOLORADODOTTIRE/PAVEMENTNOISESTUDY6.PerformingOrganizationCode7.Author(s)DouglasI.Hanson,RobertS.James8.PerformingOrganizationReportNo.CDOT-DTD-R-2004-510.WorkUnitNo.(TRAIS)9.PerformingOrganizationNameandAddressNationalCenterforAsphaltTechnologyAuburnUniversity277TechnologyParkwayAuburn,AL3683011.ContractorGrantNo.13.TypeofReportandPeriodCovered12.SponsoringAgencyNameandAddressColoradoDepartmentofTransportation4201E.ArkansasAve.Denver,Colorado8022214.SponsoringAgencyCode15.SupplementaryNotesPreparedinCooperationwiththeU.S.DepartmentofTransportation,FederalHighwayAdministration16.AbstractIntoday’ssociety,trafficnoiseisaseriousproblem.Theterm“noise”shouldnotbeconfusedwiththeterm“sound.”Noiseisthegenerationofsoundsthatareunwanted.Withrespecttotraffic,noisewouldbethegenerationofsoundsthataffectthequalityoflifeforpersonsnearroadways.Therefore,trafficnoisecanbeconsideredanenvironmentalpollutionbecauseitlowersthestandardofliving.ResearchinEuropeandintheUnitedStateshasindicatedthatitispossibletobuildpavementsurfacesthatwillreducethelevelofnoisegeneratedonroadways.ThisreportprovidestheresultsoftestingtodefinethenoiselevelsofselectedhighwaysectionsinColorado.Itdocumentspavementnoisetestingthatwasconductedon18concreteandasphaltprojectsthroughoutColorado.Conclusions:-Thequietesthotmixasphalt(HMA)pavementtestedwasanopen-gradedfrictioncourse(OGFC)surface.-TheageoftheHMAcanhaveamajoreffectonthenoiselevelofthepavement.-Ontheportlandcementconcrete(PCC)pavementsthatwerebetween2and3yearsold,thetypeoftexturingproceduredidnotseemtomakeadifferenceinthenoiselevelmeasured.Implementation:ItisrecommendedthattheColoradoDOTconsidertheconstructionofatestsectionorsectionsthatwouldevaluatetheeffectofthicknessandgradationonthenoisecharacteristicsofanOGFCwearingcourse.17.KeyWordstrafficnoise,surfacetexture,acousticenergy18.DistributionStatementNorestrictions.Thisdocumentisavailabletothepublicthrough:NationalTechnicalInformationService.5825PortRoyalRoadSpringfield,Virginia2216119.SecurityClassif.(ofthisreport)Unclassified20.SecurityClassif.(ofthispage)Unclassified21.No.ofPages3122.PriceiColoradoDOTTire/PavementNoiseStudybyDouglasI.HansonAssistantDirectorNationalCenterforAsphaltTechnologyAuburnUniversity,Auburn,AlabamaRobertS.JamesLaboratoryEngineeringNationalCenterforAsphaltTechnologyAuburnUniversity,Auburn,AlabamaReportNo.CDOT-DTD-R-2004-5PreparedbyNationalCenterforAsphaltTechnologyAuburnUniversity,Auburn,AlabamaSponsoredbytheColoradoDepartmentofTransportationInCooperationwiththeU.S.DepartmentofTransportationFederalHighwayAdministrationApril2004ColoradoDepartmentofTransportationResearchBranch4201E.ArkansasAve.Denver,CO80222(303)757-9506iiiTABLEOFCONTENTSIntroduction............................................................................................................................1Background................................................................................................................1PurposeandScope.....................................................................................................2NatureofNoise......................................................................................................................2AdditionofNoiseLevels...........................................................................................3PropagationofNoisefromaPointSource................................................................4PropagationofTrafficNoise.....................................................................................5FieldMeasurementofRoadNoise........................................................................................7StatisticalPass-byMethods.......................................................................................7SingleVehiclePass-byorControlledPass-byMethod.............................................8Close-ProximityMethod(CPX)orNear-FieldMeasurements.................................8TestResults............................................................................................................................10DiscussionofHMATestResults...............................................................................12DiscussionofPCCPTestResults..............................................................................15SummaryofResultsfromOtherNCATNoiseTesting.........................................................17OverallSummary.............................................................