Laboratory Evaluation of Pre-Devulcanized Crumb Rubber–Modified Asphalt as a Binder in Hot-Mix Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 23, Issue 8
Abstract
The purpose of this study was to investigate the properties of hot-mix asphalt (HMA) prepared with devulcanized crumb rubber–modified asphalt (DCRMA), which was processed by using pre-devulcanized crumb rubber at a lower temperature (165°C). HMA with different DCRMA content in weight were investigated, and it was found that the optimal binder content was 6.1% by weight. The packing grading mixture design method was applied in the design of DCRMA HMA. A series of laboratory tests including the submerged Marshall Stability, wheel tracking test, dynamic modulus test, small beam bending test, and four-point flexural fatigue test, were carried out to characterize the properties of DCRMA HMA. From the experimental results, it could be concluded that the pre-devulcanized crumb rubber can be used as one kind of good modifier for asphalt rubber to improve hot storage stability. DCRMA could also act as a cost-effective, modified binder in dense-graded asphalt mixture, and benefit the low temperature property and prolong the fatigue life cycle.
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Acknowledgments
The work was part of a research project sponsored by the National Key Technology R&D Program (Contract No. MSTPRC2008ABC46B08) in the Ministry of Science of the People’s Republic of China. The writers gratefully acknowledge its financial support.
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© 2011 American Society of Civil Engineers.
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Received: Sep 13, 2009
Accepted: Jan 14, 2011
Published online: Jan 18, 2011
Published in print: Aug 1, 2011
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