Characterization of Fatigue Damage of Hot Mix Asphalt Based on Residual Strength
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 8
Abstract
This study carried out laboratory investigations of fatigue damage development of hot mix asphalt (HMA) by semicircular bending (SCB) test. Strength of the HMA specimen was first investigated at different loading rates, the results of which indicate an exponential relationship between strength and loading rate. The SCB fatigue test at stress-control mode was then performed at six levels of stress-strength ratio (SSR). Two fatigue life prediction models have been established accordingly based on the concepts of the nominal SSR and the authentic SSR. The latter model can better predict fatigue behaviors. As follows, another round of SCB fatigue test was continued to investigate the relationship between residual strength and fatigue damage evolution. Analysis of test results indicate that fatigue damage evolution is nonlinear and consists of two components: the accumulative damage development and last-cycle damage jump. A fatigue damage evolution model has been finally built based on the residual strength, which can capture the “sudden death” phenomenon of the fatigue damage process at stress-control mode.
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Acknowledgments
This research was supported by the National Natural Science Foundation of China (Grant No. 51408114); the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Sep 2, 2016
Accepted: Dec 6, 2016
Published online: Apr 7, 2017
Published in print: Aug 1, 2017
Discussion open until: Sep 7, 2017
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