Laboratory Investigation of Cracking Resistance of Hot-Mix Asphalt Field Mixtures Containing Screened Reclaimed Asphalt Pavement
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 11
Abstract
This paper presents the results from a laboratory study in which hot-mix asphalt (HMA) mixtures with No. 4 sieve screened reclaimed asphalt pavement (RAP) were characterized for their cracking resistance through laboratory performance testing. A typical surface mixture commonly used in the state of Tennessee was evaluated at 0, 10, 20, and 30% RAP contents. Two types of aggregate (limestone and gravel) and three types of asphalt binders (PG 64-22, PG 70-22, and PG 76-22) were used in this study. Mixture cracking resistance was evaluated through Superpave indirect tension (IDT), beam fatigue, and semicircular bending (SCB) tests. The results from this study indicated that the inclusion of RAP generally increased stiffness and indirect tensile strength; however, it generally compromised cracking resistance for the mixtures studied. Mixture properties changed significantly at 30% RAP content as compared to those with 10 and 20% RAP. Field projects validated the findings from the laboratory study.
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Acknowledgments
This study was supported by the Tennessee Department of Transportation (TDOT). The writers would like to express special thanks to Randy Rainwater, who helped to set up MTS to conduct the mixture tests, David McMackin, who conducted all the tedious binder extraction and recovery, and William Gibbons and Stephen Horne, who carefully prepared all the mixture specimens.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 11 • November 2011
Pages: 1535 - 1543
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jul 19, 2010
Accepted: Oct 27, 2010
Published online: Nov 2, 2010
Published in print: Nov 1, 2011
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