Effect of Recycled Asphalt Pavement on Thermal Cracking Resistance of Hot-Mix Asphalt
Publication: International Journal of Geomechanics
Volume 15, Issue 5
Abstract
This study explored the thermal cracking resistance of hot-mix asphalt (HMA) mixes containing recycled asphalt pavement (RAP). One RAP source was used to design two types of Superpave mixes, namely, Oklahoma S3 base and Oklahoma S4 surface course. Four mixes containing different percentages of RAP, namely, 25 and 40% RAP for S3 base courses and 0 and 10% RAP for S4 surface courses, were designed and tested. It was found that at lower temperatures, the mix containing a lower RAP content was stiffer, as indicated by higher creep compliance and indirect tensile strength values. At higher temperatures, however, the mix containing a higher content of RAP was also stiffer. Furthermore, the measured creep compliance values were compared with current predicted compliance values. The influence of RAP content on thermal cracking resistance was also evaluated through thermal stress analysis within the mechanistic framework.
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Acknowledgments
The authors thank the Oklahoma Transportation Center (OkTC) and the Oklahoma DOT (ODOT) for providing funds for this project. The authors also acknowledge the assistance of Craig Parker, Clint Hurt, Mike Cooper, Jack Shannon, Charles Shawn, and Terri A. Madden of Silver Star Construction Company, Moore, Oklahoma, for the selection of RAP and construction of the test section with high RAP content. The assistance provided by Darin Metzer from EST, Inc., Norman, Oklahoma, in the volumetric mix design part of this study is gratefully acknowledged. The support provided by John Yaroslavski from the City of Norman is also sincerely appreciated. Finally, the assistance of Curtis Doiron and Jackson Autrey, both from the University of Oklahoma, is greatly appreciated.
References
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 15 • Issue 5 • October 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Oct 10, 2012
Accepted: Mar 4, 2014
Published online: Apr 11, 2014
Published in print: Oct 1, 2015
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