Laboratory Evaluation of Long-Term Draindown of Porous Asphalt Mixtures
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 10
Abstract
Long-term draindown is the term adopted in this study to describe the downward flow of binder in a porous asphalt mixture due to the force of gravity at high temperatures experienced during service, especially in warmer climates. The concept of long-term draindown has been qualitatively noted in field observations of porous asphalt mixtures, including open graded friction courses (OGFC). This research quantified the long-term draindown of three different OGFC mixtures by measuring the permeability of the mixes throughout an 84-day conditioning period at 60°C. The results showed that the permeability of all three mixtures decreased over the first 56 days and then leveled off or increased for the remaining 28 days. To verify that the permeability reduction was due to binder draindown, the distribution of binder content of randomly selected specimens was measured. The results from this study indicated that cellulose fibers did not have any influence on the long-term draindown of the mixtures evaluated as the other mixtures [one made with ground tire rubber modified binder and the other with Evotherm 3G (MWV Specialty Chemicals, North Charleston, South Carolina)] exhibited slightly lower rates of permeability loss despite not containing fibers.
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Acknowledgments
The authors would like to acknowledge MeadWestvaco Corporation and the Asphalt Rubber Technology Service (ARTS) at Clemson University for the financial support of this study. The hospitality of the Sloan Construction Company, Inc. for allowing the research team to utilize their lab facility is also greatly appreciated. Finally, this project would not have been possible without the support of the South Carolina Department of Transportation (SCDOT) who funded the pavement test sections.
References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 10 • October 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Jan 31, 2014
Accepted: Dec 10, 2014
Published online: Jan 27, 2015
Discussion open until: Jun 27, 2015
Published in print: Oct 1, 2015
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