Comparison of Thermal Stresses Calculated from Asphalt Binder and Asphalt Mixture Creep Tests
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 8
Abstract
Low-temperature cracking is a significant distress in asphalt pavements built in the northern United States and Canada. As temperature decreases, thermal stresses develop in the restrained asphalt surface layer; and when the temperature reaches a critical temperature, cracking occurs. The current guides use thermal stress as a critical input parameter in the low-temperature performance model. In this paper, statistical and graphical analyses are performed to compare thermal stresses that develop in an idealized asphalt pavement calculated from mixture creep data obtained using indirect tensile test (IDT) and bending beam rheometer (BBR) test. In addition, the idea of obtaining thermal stresses from binder BBR creep data is further investigated. Thermal stresses calculated using IDT and BBR mixture creep data, respectively, are similar. Thermal stresses calculated from binder creep data are significantly different than thermal stresses calculated from mixture creep data. The effect of physical hardening is investigated for a limited number of materials, and the effect on thermal stresses is significant.
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Acknowledgments
The partial support provided by Minnesota Department of Transportation is gratefully acknowledged.
References
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Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 8 • August 2013
Pages: 1059 - 1067
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 3, 2012
Accepted: Aug 9, 2012
Published online: Aug 28, 2012
Discussion open until: Jan 28, 2013
Published in print: Aug 1, 2013
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