Evaluation of Low-Temperature Binder Properties of Warm-Mix Asphalt, Extracted and Recovered RAP and RAS, and Bioasphalt
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 11
Abstract
This research project evaluates the low-temperature performance of energy-efficient and environmentally friendly hot-mix asphalt (HMA) paving materials. Innovative materials gaining interest in the asphalt pavement industry includes warm mix asphalt (WMA), recycled asphalt shingle (RAS), reclaimed asphalt pavement (RAP), and bioasphalt. The materials are used as modifiers in typical HMA to enhance low-temperature field performances. Sasobit compounds at 0.5, 1.0, and 1.5%, by weight of performance grade (PG) 52-34 asphalt binder, are used to design the WMA. Five and 10% of RAS were also added to a PG 52-34 asphalt binder. 50% of RAP combined with 50% of the base PG 58-28 binder, and 100% RAP extracted from the PG 58-28 HMA, were prepared and tested. Bioasphalt was produced from swine waste and used to modify PG 64-22 asphalt binder. By using the Superpave bending beam rheometer (BBR) and the new asphalt binder cracking device (ABCD) method, the thermal cracking performance of the samples were tested. The results showed that (1) the ABCD method can be used alongside or as a confirmation test for the BBR in evaluating the low-temperature cracking resistance behavior of asphalt binders; (2) adding WMA beyond a certain percentage could potentially reduce the low-temperature cracking performance of asphalt binders; and (3) swine waste bioasphalt can enhance low-temperature asphalt binder performance.
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Acknowledgments
This material is based in part upon work supported by the U.S. National Science Foundation Grant UNSPECIFIEDCMMI 0936726 and UNSPECIFIEDCMMI 0955001. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The authors acknowledge the funding of this project from the Federal Highway AdministrationFHA through Michigan Department of TransportationMIDOT, and U.S. Department of TransportationUSDOT through the University Transportation Center for Materials in Sustainable Transportation Infrastructure at Michigan Technological University. The contents of this article do not necessarily reflect the official views and policies of any institution or agency. The authors acknowledge the assistance of laboratory testing by Justin Foley and Brad Diener.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 23 • Issue 11 • November 2011
Pages: 1569 - 1574
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Jun 26, 2010
Accepted: Feb 15, 2011
Published online: Feb 16, 2011
Published in print: Nov 1, 2011
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