Assessing Binder Blending Level in Asphalt Mixtures Containing Recycled Asphalt Shingles
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 8
Abstract
The recycling of asphalt shingles (RAS) in hot mix asphalt (HMA) has been the topic of much research. The asphalt binder of RAS is highly aged, oxidized, and stiffened, and the incorporation of it into HMA may alter the performance characteristics of the asphalt mixture. The first goal of this study was to determine the degree to which RAS binder blends with HMA virgin binder; the second goal was to determine the potential effects of this blending of binders on the long-term performance of RAS-containing HMA. A series of laboratory experiments were conducted, and the performance of RAS-containing HMA, which was fabricated replicating practical field conditions, was compared in two extreme scenarios—zero binder blending and total blending. The results showed that the performance of RAS-containing HMA tended to be closer to the total blending scenario. This suggests that RAS binder blends with HMA virgin binder nearly to the full extent. In addition, increasing RAS content makes HMA brittle and, therefore, more vulnerable to early-age cracking.
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Acknowledgments
The authors thank the Federal Highway Administration (FHWA) for its financial support and thank John Bukowski, Michael Arasteh, and Matthew Corrigan—all from the FHWA—for their technical support. In addition, the authors gratefully acknowledge the support of the member companies of the Asphalt Institute. Without their continued interest and support, none of the work could have been accomplished. Additional support was provided by the University of Kentucky.
Disclaimer
This paper is based on work supported by the US Department of Transportation under Cooperative Agreement No. DTFH61-11-H-00033. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the US Department of Transportation, the University of Kentucky, or the Asphalt Institute and its member companies.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 8 • August 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Nov 1, 2018
Accepted: Mar 26, 2019
Published online: May 23, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 23, 2019
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