Influence of RAP Dispersion Characteristics on Mixture Performance
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 9
Abstract
Due to the ever-dwindling level of natural aggregate/asphalt resources and shrinking budgets for infrastructure assets management, engineers have been striving to incorporate more and more recycled asphalt pavement (RAP) materials into pavement maintenance and rehabilitation activities. One critical issue with using RAP is characterizing the actual dispersion characteristics of RAP in the mixture. This study addresses this issue through image analysis and a series of mixture performance tests, including the Marshall stability test, volumetric property test, wheel tracking test, three-point bending test, and freeze-thaw splitting test. The results showed that scanned images of asphalt mixture slices were effective in identifying the dispersion characteristics of the RAP in the mixture. An aggregate five pixels and an aggregate centroid distance of 55 pixels were proposed as the threshold for RAP dispersion, and the dispersion ratio was employed to evaluate the RAP dispersion characteristics of a mixture. With the extension of mixing time, the Marshall stability of the mixture increased but the air voids decreased, which then caused a decrease in the optimum asphalt content of the mixture. In addition, the rutting resistance and cracking resistance of the mixture were significantly improved, whereas the moisture susceptibility was slightly enhanced.
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Acknowledgments
This research was financially supported by National Natural Science Foundation of China (51878075), Guangxi Traffic Science and Technology Project (Gui Jiao Ke 2013-100-28), and Guangxi Technical Plan Project (AC16380111). Any opinions, findings, and conclusions expressed in this article are those of the authors and do not necessarily reflect the views of the funding departments.
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 9 • September 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Sep 29, 2018
Accepted: Feb 7, 2019
Published online: Jun 17, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 17, 2019
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