混合料低温性能中的改性沥青性能理解.doc

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1、UnderstandingthePerformanceofModifiedAsphaltBindersinMixtures:Low-TemperaturePropertiesFHWA-RD-02-074byKevinD.StuartandJohnS.YoutcheffFOREWORDThisreportdocumentstheeffectsofpolymer-modifiedasphaltbindersonthelow-temperaturecrackingresistancesofasphaltmixtures.Anemphasis

2、wasplacedonevaluatingtheperformancesofmixturescontainingpolymer-modifiedasphaltbinderswithidenticalSuperpaveperformancegrades,butvariedmodificationchemistries.Thisstudyispartofalargerstudytitled"UnderstandingthePerformanceofModifiedAsphaltBindersinMixtures,"whichisparti

3、allyfundedthroughtheNationalCooperativeHighwayResearchProgram(NCHRP)Project90-07.TheobjectiveofNCHRPProject90-07istodetermineifasphaltbinderperformanceiscorrectlycapturedbytheSuperpaveasphaltbinderspecificationdevelopedunderthe1987through1993StrategicHighwayResearchProg

4、ramandmodifiedundersubsequentstudies.Thisreportwillbeofinteresttohighwaypersonnelwhousepolymer-modifiedasphaltbindersandSuperpave.TherecentlydevelopedSuperpavecriticalcrackingtemperature(Tcr)forasphaltbindersagreedwithmixtureperformance,exceptforoneasphaltbinderthatiscu

5、rrentlynotusedinpractice.Severalaggregatetypeswereincludedinthestudy.Theadditionofhydratedlimetooneoftheaggregatessignificantlyaffectedthelow-temperaturepropertiesofthemixture.Themechanismforthisisnotclearlyunderstoodandwillbeinvestigated. T.PaulTeng,P.E.Director,Office

6、ofInfrastructureResearchandDevelopment   NOTICEThisdocumentisdisseminatedunderthesponsorshipoftheDepartmentofTransportationintheinterestofinformationexchange.TheU.S.Governmentassumesnoliabilityforitscontentsorusethereof.Thisreportdoesnotconstituteastandard,specification

7、,orregulation.TheU.S.Governmentdoesnotendorseproductsormanufacturers.Tradeandmanufacturers=namesappearinthisreportonlybecausetheyareconsideredessentialtotheobjectofthedocument.ObjectiveTheobjectiveofthisstudywastoevaluatethecrackingtemperaturesforasphaltbindersprovidedb

8、y theBendingBeamRheometer(BBR)andThermalStressAnalysisRoutine(TSARTM).Low-temperaturemixturepropertiesprovided