Effects of GTR and Treated GTR on Asphalt Binder and High-RAP Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 4
Abstract
One approach to produce environmentally friendly and cost effective asphalt mixtures is to use more readily available recycled materials like reclaimed asphalt pavement (RAP) and rubber. In this study, ground tire rubber (GTR) and treated ground tire rubber (TGTR) were added to an asphalt binder and to high RAP content mixtures. Rutting and fatigue characteristics of the modified binder were evaluated.GTR and TGTR improved the rutting and fatigue performance of the asphalt binders. A suspension agent helped reduce the degree of separation. GTR was introduced into the binder and the resulting rubberized binder was used to prepare the mixtures. The TGTR was directly added to the mixture. TGTR mixtures were mixed and compacted at lower temperatures compared with GTR mixtures. The dynamic modulus, reflective cracking performance, low temperature cracking, and rutting and moisture susceptibility were evaluated for the mixtures. GTR and TGTR made improved resistance to rutting, moisture susceptibility, and low temperature cracking. According to the Texas overlay test, the GTR and TGTR might not improve the mixture’s resistance to reflective cracking.
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Acknowledgments
The authors would like to acknowledge Ryan Alleman for supplying the GTR, Chris Strack of Sonneborn Inc. for providing the treated GTR, and Mark Gabriel of the All State Materials Group for supplying the virgin binder. Finally, the authors would like to thank the University of Massachusetts Dartmouth graduate student Suren Parajuly for his assistance with the laboratory testing for this project.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 4 • April 2014
Pages: 721 - 727
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Dec 3, 2012
Accepted: May 21, 2013
Published online: May 23, 2013
Discussion open until: Oct 23, 2013
Published in print: Apr 1, 2014
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