Mechanistic Characterization of Reclaimed Asphalt Pavement (RAP) as a Structural Base Layer Across Climatic Conditioning

With infrastructure renewal underway in Saskatchewan, both new road construction and rehabilitation has increased available Reclaimed Asphalt (RAP) and boosted aggregate needs. Pilot studies in the City of Saskatoon (COS) used RAP materials as a high value base layer material and have seen good field performance. To successfully use RAP in new and rehabilitated roads, it is important to characterize RAP in a manner that accurately predicts field performance. Research has shown the viscoelastic binder properties can significantly influence the mechanical behaviour of recycled asphalt concrete rubble, which influences the life cycle field performance road structure. Mechanistic material characterization was used in this research to examine the viscoelastic properties of COS RAP under varying climatic condition states. RAP materials were evaluated in a dry condition state at 25 and 40 deg C, following vacuum saturation at 25 deg C, and in an optimum moisture condition state at 25 deg C. Mechanistic material properties were evaluated to examine how climatic effects can relate to laboratory characteristics of RAP. This study showed that RAP materials have superior mechanistic material properties as compared to conventional granular base materials. Improved climatic and moisture resistance is due to the inherent asphalt cement present in the RAP material. (A)

Language

  • English

Media Info

  • Pagination: p. 147-64
  • Monograph Title: Proceedings of the Fifty-Seventh Annual Conference of the Canadian Technical Asphalt Association: Vancouver, British Columbia November 2012

Subject/Index Terms

Filing Info

  • Accession Number: 01494231
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • Files: ITRD, TAC
  • Created Date: Sep 24 2013 12:57PM