City of Winnipeg's Experience with Recycled Asphalt Shingles (RAS) in Hot Mix Asphalt (HMA)

摘要

The use of Recycled Asphalt Shingles (RAS) in Hot Mix Asphalt (HMA) has gained popularity in Canada because of its potential economic and environmental benefits. The City of Winnipeg Public Works Department initiated a study in 2013 with the University of Manitoba to evaluate the field performance of RAS in HMA overlays of concrete pavement in the City. Fifteen (15) field trials using 3 percent RAS in 50mm HMA overlays were built between 2010 and 2013 and were selected for field evaluation. The City of Winnipeg's Type-1A (Control) mix was placed alongside the RAS mix at eleven of the fifteen locations as a control for the field comparison. Post-overlay distress surveys were conducted in 2013 to evaluate and compare the field performance of the RAS and Control overlays. In addition, the asphalt binders were extracted from the RAS and Control mixes and graded using the Superpave? performance binder tests. This paper presents the findings of the field evaluation and comparison of the RAS and Control overlay performance. The results will assist in the development of guidelines and recommendations for the future use of RAS in HMA overlays in the City of Winnipeg.