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Title:: Advances on the Application of Recycled Asphalt Shingles (RAS) in Asphalt Pavement Recycling

Author(s):: MA Feng1; XING Haipeng1; LU Xianlin2; 1.School of Highway, Chang’an University, Xi’an 710064, China 2.School of Materials Science and Engineering, Chang’an University, Xi’an 710064, China

Keywords:: road engineering; RAS; recycling; asphalt mixture; pavement performance

Abstract:: In order to reuse a large number of waste recycled asphalt shingles (RAS) material generated by construction industry, and promote the recycling of waste RAS, feasibility and recycling method about application RAS in recycling asphalt mixture are expounded. The viscosity, rutting resistance, and low temperature cracking resistance of RAS modified binder are reviewed. Furthermore, pavement performance of reclaimed asphalt mixture by RAS, and environmental as well as economic benefits are also reviewed. In addition, the existing problems and further research advice are proposed in this paper. Existing researches show that RAS modified binder exists better rutting resistance and low temperature performance, low temperature cracking performance is no evidently deteriorated at low RAS content. Moreover, the increasing viscosity and stiffening problem caused by RAS can be eliminated by introducing biobinder. After RAS is mixed into asphalt mixture, the stiffness, rutting resistance, fatigue cracking resistance and moisture susceptibility are improved effectively. Through adopting foaming technology and additives, the workability of warm mix asphalt mixture recycled by RAS can be improved. The integration of RAS recycling technology with warm mix asphalt (WMA) is more environment friendly and economic, and can provide practical significance for environmental pavement engineering researches.