Development of a Predictive System for Estimating Fatigue Life of Asphalt Mixtures Using the Indirect Tensile Test
Publication: Journal of Transportation Engineering
Volume 138, Issue 12
Abstract
Fatigue cracking is a major problem in asphalt pavement. It would be beneficial for predictions of the fatigue life of asphalt mixtures to be made with minimal effort and time, both at the design stage and the operating stage of pavement. For practicality, the indirect tension (IDT) test has widely been used for testing both laboratory-made and field-cored mixtures; however, a fatigue test using the IDT test needs to be performed in the stress-controlled mode rather than in the strain-controlled mode. Results may not be comparable to those from other mixture tests, such as the flexural beam fatigue or uniaxial tension test, so this study employed the viscoelastic continuum damage (VECD) model. The curve, which is a final product of the VECD model, is known as a single-characteristic curve of an asphalt mixture and is independent of loading types. Three curves obtained from two fatigue tests and one monotonic strength test using the IDT test were similar when superimposed into a single curve, indicating that the VECD model can be applicable both to the IDT fatigue test and the strength test. This also indicates that the fatigue life of a mixture subjected to sinusoidal strain loading can be determined through the model’s damage principles using the IDT test results. Consequently, a system for predicting the fatigue life of asphalt mixtures was developed. It is expected that the predictive system will be useful in estimating the fatigue life of asphalt mixtures fabricated in the laboratory and those cored from field pavements.
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Acknowledgments
The authors would like to express their gratitude to the Florida Department of Transportation for their support in relation to laboratory testing. Special thanks goes to Gregory A. Sholar at the Florida Department of Transportation for his assistance.
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Information & Authors
Information
Published In
Journal of Transportation Engineering
Volume 138 • Issue 12 • December 2012
Pages: 1530 - 1540
Copyright
© 2012 American Society of Civil Engineers.
History
Received: Nov 8, 2009
Accepted: Mar 21, 2011
Published online: May 4, 2012
Published in print: Dec 1, 2012
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