Abstract
The original intent of the limit applied to multiple stress creep and recovery test results was to ensure that an asphalt binder does not fail if, under real-world application, it experienced higher stresses or temperatures than what was considered in the laboratory. In recent years, challenges meeting the specification for asphalt binders with low (mainly less than ) have been documented, with reported values greater than 400% in some cases. This paper presents an argument that is an inaccurate representation of stress sensitivity, unfairly penalizes asphalt binders with low , and lacks correlation with expected changes in field rutting performance. A new parameter that more appropriately describes stress sensitivity, , is presented. shows a better performance-based relationship to expected changes in rutting and more accurately ranks the study asphalt binders than . also demonstrates the ability to capture changes in with respect to increases in test temperature. Finally, a conceptual, performance-based specification limit is presented. Overall, provides an alternate parameter to accurately interpret and describe stress and temperature sensitivity and demonstrates potential as a performance-based parameter.
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Acknowledgments
This study was funded in part by the Arizona Pavement/Materials conference. The authors also thank the Arizona Department of Transportation Asphalt Binder Laboratory and Dan Anderson (laboratory supervisor) for testing efforts and work to create and maintain the database used in this research work and the Montana Department of Transportation and Leslie White (Materials Bureau) for their assistance in allowing the authors access to their test data. Finally, the opinions, theory, and conclusions of this study are the work of the authors and do not necessarily represent the views and opinions of other persons or organizations who provided data for this study.
References
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©2017 American Society of Civil Engineers.
History
Received: Feb 15, 2017
Accepted: Aug 2, 2017
Published online: Dec 6, 2017
Published in print: Feb 1, 2018
Discussion open until: May 6, 2018
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