Development of guidelines for usage of high percent RAP in warm-mix asphalt pavements.

794685078Final report; 11/01/2010-11/25/2011.PDFTech ReportFHWA-PA-2011-013-PSU 032LTI 2012-02510602, PSU 032Asphalt mixturesPaving materialsWarm mix paving mixturesRecycled materialsWaste productsMix designPennsylvaniaPennsylvania. Dept. of TransportationSolaimanian, MansourMilander, ScottBoz, IlkerStoffels, ShelleyThomas D. Larson Pennsylvania Transportation InstitutePennsylvania. Dept. of Transportation. Bureau of Planning and ResearchNTL-HIGHWAY/ROAD TRANSPORTATION-MaterialsNTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and PerformanceNTL-HIGHWAY/ROAD TRANSPORTATION-Construction and MaintenanceUS Transportation CollectionRoad construction using warm-mix asphalt has been rapidly gaining popularity in the United States, in part becauseWMA is believed to be friendlier to the environment as compared to hot-mix asphalt. Parallel to this rapid growth inWMA construction is utilization of reclaimed asphalt pavement (RAP) in road construction. Research was conductedto develop guidelines for using high percentages of RAP in WMA. The laboratory work was focused on three WMAtechnologies: water foaming, a chemical additive (Evotherm\ue2\u201e\ua2), and an organic additive (Sasobit\ue2\u201e\ua2). The workincluded RAP characterization, mix design, moisture damage evaluation, and rutting evaluation using the SuperpaveShear Tester and Model Mobile Load Simulator Third Scale. Accelerated load testing was conducted at atemperature range of approximately 42 to 50\uc2\ub0C for 400,000 cycles of loading. Rutting resistance of the mixes wasrated as fair to good. This research indicates that it is possible to produce WMA with high RAP having sufficientmoisture damage and rutting resistance. However, a mix design established for HMA does not necessarily producesatisfactory performance when used with WMA, and it is important that moisture damage and rutting susceptibility ofWMA be evaluated for any mix design, even though that mix design may have demonstrated satisfactoryperformance for HMA