Journal
ROAD MATERIALS AND PAVEMENT DESIGN
Volume 18, Issue 3, Pages 730-752Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/14680629.2016.1182060
Keywords
asphalt rubber; gap; graded gradation; crumb-rubber; mix design; performance evaluation
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The use of asphalt-rubber gap-graded (AR-Gap) mix as a pavement material has gained importance due to its environmental benefits and enhanced performance. This paper reviews the current state-of-the-art pertinent to AR-Gap mix design research and practice. The various mix design practices of AR-Gap mixes adopted by various agencies were summarised. Furthermore, the performance characteristics of AR-Gap mixes such as drain-down, moisture susceptibility, permanent deformation, and fatigue cracking were also documented. The field performances of AR-Gap pavements were also reviewed. Due to an increased use of AR-Gap as a pavement material owing to its several benefits, there exists an extensive scope for further research to understand the material better, which will make it a promising sustainable pavement material in future. Furthermore, considering that AR-Gap mix design and construction technologies are yet to be fully implemented worldwide, the present work aims to be an upto- date reference to provide benefits and issues associated with the AR-Gap mixes. However, based on the various research questions emanating out of the review process, it was adjudged that there is still further scope for advancing the current state-of-the-art pertaining to the ARGap mix design, and the contribution of rubber inclusions in assisting the mix's augmented performance.
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