Reclaimed Asphalt Pavement Limits to Meet Surface Frictional Requirements
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 1
Abstract
Reclaimed asphalt pavement (RAP) is widely used to construct new asphalt pavement layers, but its use is often limited in surface courses because of concerns about frictional performance, especially in areas where polish-resistant aggregates are scarce or not available. The goal of the research reported in this paper was to determine the maximum amount of RAP that can be blended with high-friction aggregates and used in surface mixes without significantly impacting frictional properties. The properties of RAP from six different sources were evaluated to determine typical RAP characteristics and used to fabricate a mixture simulating a worst-case scenario RAP with a low-friction aggregate. That RAP mixture was used to evaluate the frictional characteristics of two types of hot-mix asphalts with various amounts and types of high-friction aggregates. Specimens were subjected to laboratory polishing to simulate the effects of traffic. Results suggest that the threshold level of RAP in surface mixes that will not have detrimental effect on their frictional properties was about 30%, even when the RAP contained a highly polishable aggregate.
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Acknowledgments
The research reported in this paper was supported by the Joint Transportation Research Program administered by the Indiana DOT and Purdue University. The contents of this paper reflect the views of the writers, who are responsible for the facts and the accuracy of the data presented, and do not necessarily reflect the official views or policies of the Federal Highway Administration and the Indiana DOT, nor do the contents constitute a standard, specification, or regulation. Gratitude is expressed to Mr. Yu-Min Su, Dr. Ayesha Shah, Dr. Eyal Levenberg, and Mr. Wubeshet Woldemariam of Purdue University for their assistance during testing and for the in-depth discussions. Mr. Andrew Szabat’s review of the draft of the paper is also appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Oct 15, 2014
Accepted: Mar 5, 2015
Published online: May 18, 2015
Discussion open until: Oct 18, 2015
Published in print: Jan 1, 2016
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