Experimental Investigations of the Viscoelastic and Damage Behaviors of Hot-Mix Asphalt in Compression
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 4
Abstract
In this paper, the characteristic behaviors of hot-mix asphalt (HMA) in compression are studied by using concepts from the viscoelastic continuum damage (VECD) modeling approach. Temperature and frequency sweep tests with and without confining pressure were performed to determine the linear viscoelastic properties of HMA. The analysis of these tests showed that HMA exhibits significant and reversible stress-hardening behavior. This behavior was subsequently modeled by using a model developed from similar efforts for granular materials. To prove the importance of considering this characteristic behavior, constant crosshead rate tests were performed and analyzed with and without stress hardening. The VECD analysis framework was utilized for this purpose. When stress-hardening behavior was taken into account, it was found that microdamage-induced softening occurred over a range of temperatures from 5°C to 55°C. This finding suggests that microdamage may be significant for conditions in which HMA rutting is a primary concern. It also suggests that the mechanisms of microcrack-induced damage and stress-induced hardening must be investigated to accurately model the global behavior of HMA in compression.
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Acknowledgments
The writers would like to acknowledge the financial support provided by the Federal Highway Administration under the project FHAFHWA DTFH61-05-RA-00108.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 4 • April 2011
Pages: 459 - 466
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 7, 2010
Accepted: Oct 5, 2010
Published online: Oct 7, 2010
Published in print: Apr 1, 2011
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