Comparing Laboratory Conditioning Protocols to Longer-Term Aging of Asphalt Mixtures in the Southeast United States
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 1
Abstract
This paper uses mixture tests on cores from a full-scale and untrafficked test section to evaluate mixture conditioning protocols intended to simulate asphalt mixture damage experienced from non–load-associated environmental factors. Seven protocols were evaluated against up to 5 years of aging in a hot climate. After matching conditioning protocols to field aging with multiple mixture tests, this paper places secondary emphasis on selecting a suitable mixture test to detect mixture damage caused by non–load-associated environmental factors or laboratory damage mechanisms (i.e., oxidation, moisture, and volume change by freeze-thaw cycles). The data suggest that Cantabro mass loss was appropriate for pairing conditioning protocols to field aging and that 5 days of oven oxidation at 85°C in compacted mixtures was the least severe conditioning protocol considered (simulating 0–2 years of field aging). The protocol that conditioned field cores for 5 days of oven oxidation at 85°C followed by 14 days in 64°C water and one freeze-thaw cycle simulated 4–5 years of field aging in Columbus, Mississippi.
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Acknowledgments
The Mississippi Department of Transportation funded Project 106526, State Study 266, and State Study 270, which, among other items helped support the lead author while a doctoral student at Mississippi State University. Test section construction was performed by APAC Mississippi supported by Ergon Asphalt and Emulsions and funded as part of Project 70015 by the Southeast Region Research Initiative (SERRI) through Oak Ridge National Laboratory. Individuals deserving special thanks are Alex Middleton, Griffin Sullivan, James Williams, Benjamin Thomas, Mike Bogue, Dwayne Boyd, Trey Jordan, Mike Hemsley, and Gaylon Baumgardner. Multiple Mississippi State University students assisted this work in some way: Amanda Hufft, Anna Baglan, Rabeea Bazuhair, Brittni Cooper, Carl Pittman, Catherine Sparks, Ethan Whaley, Robert Moore, and Westin Graves. The Ergon Asphalt and Emulsions Student Support Initiative in Construction Materials funded some of these students while working.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 24, 2018
Accepted: Jul 5, 2018
Published online: Oct 26, 2018
Published in print: Jan 1, 2019
Discussion open until: Mar 26, 2019
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