Rejuvenation of asphalt pavement surfacings by hot recycling - Cost and conservation viewpoint

Abstract

Hot recycling of asphalt pavements has received considerable attention from highway authorities around the world over the past decade or so because of its simplicity and the benefits that it offers over the conventional fresh mix overlay. Hot recycling usually involves removing the old distressed surfacing partially or fully and constructing the new surfacing, making use of the materials removed after rejuvenating them suitably. The main benefit of hot-mix recycling is significant cost savings by way of conservation of natural resources and reduced energy consumption. In this paper, the authors briefly discuss hot-mix recycling procedures and include computations based on data collected from published case studies to illustrate the three potential benefits, namely, energy savings, conservation of materials and overall cost reductions.