Improving the properties of reclaimed asphalt pavement for roadway base applications [summary].

Summary.PDFTech ReportBDK81 977-02PavingAsphalt pavementsPavement performancePortland cement concretePortland cementWaste productsRecycled materialsFloridaFlorida. Dept. of TransportationCosentino, PaulFlorida Institute of Technology. Civil Engineering Dept.NTL-HIGHWAY/ROAD TRANSPORTATION-MaterialsNTL-HIGHWAY/ROAD TRANSPORTATION-Construction and MaintenanceNTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and PerformanceUS Transportation CollectionOver 90 percent ofU.S. roads are pavedwith asphalt, whichmust be periodicallyresurfaced. Millingproduces reclaimedasphalt pavement (RAP),which can be recycledin hot-mix asphalt,but at no more than25%. Therefore, muchRAP remains for otherroadway applications.RAP is a well-drained,granular material available on site; however, 100%RAP has low bearing strength and creeps underload.In this project, Florida Institute of Technologyresearchers sought to improve RAP bearingstrength and reduce creep to levels acceptablefor roadway base applications. Several processingmethods and additives were tested. Specimenswere evaluated wet and dry by strength tests,including limerock bearing ratio (LBR), unconfinedcompression, Marshall compression, and indirecttensile tests. Seven-day, one-dimensionalconsolidation tests evaluated creep deformation