Fatigue Performance Prediction of Asphalt Pavement Based on Semicircular Bending Test at Intermediate Temperature
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 9
Abstract
The objective of this study is to correlate asphalt mixtures’ crack resistance with their in situ cracking performance. Ten mixtures were obtained from a full-scale experiment at the Federal Highway Administration (FHWA) Accelerated Loading Facility (ALF), which were constructed with various contents of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS), two warm-mix technologies, and two asphalt binder grades. The mixtures’ linear viscoelastic properties were assessed through dynamic modulus testing. Fracture resistance was characterized by the critical strain energy release rate (), which was obtained from semicircular bending (SCB) tests at intermediate temperature. The increase in RAP/RAS content was found to enhance mixture’s stiffness while reducing the mix crack resistance. No significant difference in terms of crack resistance was observed between the two used warm-mix technologies. The use of a soft binder was effective in improving the crack resistance of mixtures with a high RAP content. The generic fatigue model from the literature did not correlate well with the ALF test results; modification was achieved by introducing as an indicator of crack resistance into the model form. The resulting -based model exhibited an adequate correlation with field performance measured by the ALF test results.
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Acknowledgments
The research presented herein is part of Transportation Pooled Fund TPF-5(294) “Develop Mix Design and Analysis Procedures for Asphalt Mixtures Containing High-RAP and/or RAS Contents.” The authors would like to acknowledge the support of the Federal Highway Administration and the Louisiana Transportation Research Center. The assistance of Dr. Jack Youtcheff, Dr. Nelson Gibson, and Mr. Xinjun Li in obtaining field data of ALF test lanes is greatly appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 8, 2017
Accepted: Mar 30, 2018
Published online: Jun 29, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 29, 2018
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