Structural Coefficients of Cold Central-Plant Recycled Asphalt Mixtures
Publication: Journal of Transportation Engineering, Part A: Systems
Volume 143, Issue 6
Abstract
Two full-scale pavement sections built in 2012 at the National Center for Asphalt Technology (NCAT) Test Track were used to assess the structural contribution of cold central-plant recycling (CCPR) with 100% reclaimed asphalt pavement (RAP) and foamed asphalt as a recycling agent (CCPR-foam). The two test sections performed effectively, presenting no evidence of pavement damage during a two-year period of accelerated traffic loading in which 10 million equivalent single-axle loads (ESALs) were applied. Furthermore, ride quality was not significantly affected with the application of traffic. Frequent deflection testing over the duration of the study revealed that CCPR-foam exhibited a similar response to temperature as that observed for conventional asphalt concrete (AC). A procedure based on backcalculated modulus data was followed to determine the structural layer coefficients for the CCPR-foam layers. The layer coefficients were found to vary from 0.14 to (). Quantifying the structural coefficient allows this material to be effectively used in the AASHTO empirical method of pavement thickness design currently employed by many U.S. states.
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Acknowledgments
This study was sponsored by the Virginia Department of Transportation. Special recognition goes to Trenton Clark and Richard Schreck from the Virginia Asphalt Association, David Stowell from Slurry Pavers, Marlin Hewitt from B&S Contractors, Mike Marshall from Wirtgen America, and Richard Ferron. Dr. Buzz Powell and Jason Nelson from NCAT deserve special recognition for their contribution to this investigation.
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Information & Authors
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Published In
Journal of Transportation Engineering, Part A: Systems
Volume 143 • Issue 6 • June 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 20, 2016
Accepted: Sep 2, 2016
Published ahead of print: Feb 23, 2017
Published online: Feb 24, 2017
Published in print: Jun 1, 2017
Discussion open until: Jul 24, 2017
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