Development of a Damage-Based Phenomenological Fatigue Model for Asphalt Pavements
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 8
Abstract
Bottom-up fatigue cracking is one of the major distresses for asphalt pavements. Accurate prediction of fatigue cracking for asphalt pavement is of paramount importance for a cost-effective pavement design. A fatigue model based on mechanistic-empirical pavement design is modified from an Asphalt Institute model. However, there are some controversies about the effectiveness of the mechanistic-empirical pavement design fatigue model. The major concern exists on the use of dynamic modulus as a key parameter and there is no damage property of asphaltic mix to predict fatigue, which is induced by damage to the material. This study developed a damage-based phenomenological fatigue model. The pavements at the Federal Highway Administration’s Accelerated Loading Facility (ALF) were used to test the effectiveness of existing models, including the mechanistic-empirical pavement design fatigue model, and validity of the damage-based fatigue model. The data used in this study included dynamic modulus, critical strain-energy density of hot-mix asphalt (HMA), tensile strain at the bottom of HMA layer, and the fatigue life of ALF pavements. It was found that the damage-based model significantly improved the accuracy of the prediction, when compared with the mechanistic-empirical pavement design fatigue model and other conventional models.
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Acknowledgments
The authors wish to thank Dr. Nelson Gibson and Dr. Jack Youtcheff of the FHWA Highway Research Center, and Dr. Emin Kutay of Michigan State University for their support to this study.
References
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© 2013 American Society of Civil Engineers.
History
Received: Dec 12, 2011
Accepted: Jul 24, 2012
Published online: Aug 27, 2012
Discussion open until: Jan 27, 2013
Published in print: Aug 1, 2013
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