The Use of Recycled Open Graded Porous Asphalt in High Performance Surfacing Mixes for High Volume Roads
Conference Paper
Overview
Identity
Additional Document Info
Other
View All
Overview
abstract
Copyright 2016 by Mairepav8 2016 Organizers. With an increasing focus on construction costs and sustainability policies recycled asphalt pavement (RAP) is now routinely incorporated in new hot-mix asphalt (HMA) mix designs to minimize waste and re-utilise the valuable binder and non-renewable mineral resources. This RAP typically comes from the milling of dense-graded (DG) mixes and is incorporated as a part of the new DG HMA at relatively high percentages. Currently, re-use of millings from porous asphalt (PA) is very limited. Due to New Zealand's focus on safety and specifically skid resistance properties, PA is the mix type of choice for surfacing on high volume roads in New Zealand. However, no RAP is currently allowed in such mixes and millings from PA sites are often used in low value recycling applications, which results in wastage of very high value materials including high skid performance artificial slag aggregates. Due to an increasing volume of projected forward works surfacing maintenance on high volume roads in the Auckland region in the next four years, increased volumes of RAP from PA sites will be available. Therefore, there is a growing sustainability imperative and need to incorporate PA-derived RAP into new PA mixes. Thus, the objective of the current research includes characterization of PA-derived RAP milled from the Auckland Motorway network to develop criteria for effective recycling of this material into new hot-mix PA. This paper discusses the proposed experimental methodology for evaluation of this RAP and the asphalt mix properties that result from its incorporation into new HMA mixes.
name of conference
Proceedings of the Eighth International Conference on Maintenance and Rehabilitation of Pavements
