Characterization of HMA Mixtures Containing High Reclaimed Asphalt Pavement Content with Crumb Rubber Additives
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 11
Abstract
The objective of this study was to evaluate the use of crumb rubber (CR) from waste tires and engineered additives as a rejuvenator to high reclaimed asphalt pavement (RAP) content asphalt mixtures. Six asphalt mixtures were prepared by mixing aggregate blends with four asphalt binders, an unmodified asphalt binder classified as performance grade (PG) 64-22, two polymer-modified binders classified as PG 70-22M and PG 76-22M, and a PG 76-22 crumb-rubber-modified binder. The RAP content was varied from 0–40% and crumb-rubber additives were blended with the unmodified binder by using wet and dry processes. Hot-mix asphalt (HMA) mixture testing included an evaluation of rutting susceptibility, moisture resistance, and resistance to cracking using the flow number test, the loaded-wheel tracking test, the dynamic modulus test, the modified Lottman test, the dissipated creep strain energy test, and the semi-circular bending test. Results of the experimental program indicated that the addition of the CR additives rejuvenated the blended asphalt binder for the HMA mixture with high RAP content. The use of high RAP content with crumb rubber as a rejuvenator in the preparation of HMA is expected to provide adequate moisture resistance and superior rutting resistance as compared to conventional mixtures. However, because of the hardening properties of the mix prepared with high RAP content, the fracture and cracking resistance of the produced mixture was reduced compared with polymer-modified mixes.
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Acknowledgments
This research was sponsored by the Louisiana Transportation Research Center (LTRC) and the Louisiana Department of Transportation and Development (LADOTD). The writers would like to express their thanks to all of those who have provided valuable helps in this study. In addition, the writers would like to thank Mr. John Osborn of Elastomeric Concentrates, LLC, who supplied the crumb-rubber additives utilized in this study.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 11 • November 2011
Pages: 1560 - 1568
Copyright
© 2011 American Society of Civil Engineers.
History
Received: May 30, 2010
Accepted: Jul 1, 2011
Published online: Oct 14, 2011
Published in print: Nov 1, 2011
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