Asphalt Binder Laboratory Short-Term Aging: Effective Parameters and New Protocol for Testing
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 1
Abstract
This work addresses the effect of time, temperature, airflow rate, and weight of asphalt binder on the laboratory short-term aging of asphalt binders and proposes an alternative protocol that can reduce the aging time and resolve some of the current short-term aging protocol shortcomings. In the first part of this study, two asphalt binders from different sources were examined in a rolling thin-film oven at different combinations of the aforementioned test parameters. The high-end continuous performance grading temperature and carbonyl index were considered as the two responses for quantification and qualification of laboratory aging. The statistical analysis showed that the first-order terms of time, temperature, and weight as well as their interactive terms were statistically significant. However, the effect of airflow rate within the studied range was insignificant. Based on the findings of the first part of study, an alternative protocol was proposed for the study of short-term aging in a rolling thin-film oven. One unmodified and three highly modified binders were aged in a rolling thin-film oven under the current and proposed aging conditions for comparative purposes. According to the obtained rheological properties (high- and low-end continuous performance grading temperature and viscosity) as well as the chemical characteristics (carbonyl index, saturate-aromatic-resin-asphaltene fractions, and oxygen content), it was shown that the proposed laboratory short-term aging protocol not only can reduce the aging time of the conventional protocol, but also that it is applicable to both unmodified and polymer-modified asphalt binders.
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Acknowledgments
This study was funded by the Nebraska Department of Transportation (NDOT). The authors would like to thank John Gude and Mathew Kumbier (both of Nebraska DOT), Jon Arjes, Sydney Knight, and Kenneth Williams (all of Iowa DOT), Donna Mahoney, Brent Gurwell, Joyce Paynter, Pam Bean, and Ben Kowach (all of Kansas DOT) for their contribution to the binder sample preparation and testing. In addition, the authors gratefully acknowledge MTE Services and Mary Ryan for performing the SARA test, Galbraith Laboratories for performing the elemental analysis, and the equipment support from the Nebraska Research Initiative (NRI) at the University of Nebraska–Lincoln.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 1 • January 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Apr 12, 2019
Accepted: Jun 19, 2019
Published online: Oct 25, 2019
Published in print: Jan 1, 2020
Discussion open until: Mar 25, 2020
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