Influence of Binder Source and Recycled Asphalt Materials on Asphalt Binder Relaxation Properties for Northern Climates
Publication: Journal of Cold Regions Engineering
Volume 35, Issue 1
Abstract
Low-temperature pavement performance is important in freezing areas in northern climates. While agencies and contractors pursue efforts to add recycled asphalt materials (RAMs) into the mix design to reduce costs, the aged, stiffer material being blended in can dramatically alter the performance. A correlation between the Glover–Rowe parameter (G–R) and delta Tc (ΔTc) was developed in 2011 by Anderson et al. to relate the onset of nonload-related and significant cracking values. The relationship provides a correlation between nonload-related and low-temperature cracking properties of the binder. To further evaluate this relationship, four cold-region virgin binders from Wisconsin and Michigan were blended with varying percentages of RAM mixtures. Blends were then laboratory aged tested to obtain stiffness, m-value, complex shear modulus, and phase angle from BBR and DSR testing, allowing for the calculation of ΔTc and the G–R parameters. Investigation of their correlation for each binder source and the change in ΔTc was evaluated for each blend. Updated correlations and trends show that correlations are source dependent, suggesting that the ΔTc specification maxima should be re-evaluated for their inclusion of RAP sources.
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Acknowledgments
The authors would like to acknowledge the help of Gail Hall and Tyler Yager of Payne & Dolan, Inc. for making this paper possible.
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Information & Authors
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Published In
Journal of Cold Regions Engineering
Volume 35 • Issue 1 • March 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: May 13, 2019
Accepted: Jul 14, 2020
Published online: Oct 23, 2020
Published in print: Mar 1, 2021
Discussion open until: Mar 23, 2021
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