Innovative Approach to Characterizing Damage Evolution in Asphalt Concrete during Fatigue Tests
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 7
Abstract
Fatigue cracking, either top-down or bottom-up, is one of the major distresses in asphalt pavements. One of the significant challenges in predicting the fatigue cracking behavior of asphalt concrete is that such behavior, unlike that of elastic materials, depends on external conditions, such as temperature and loading rate within the nondamage or damage domain. The application of the viscoelastic continuum damage (VECD) approach or its further development, the viscoelastoplastic continuum damage (VEPCD) approach, requires extensive material testing of the viscoelastic properties (i.e., creep compliance or relaxation), uniaxial or multiscale fatigue tests, and computations, which may hinder the implementation of this fundamental approach for the characterization of fatigue for asphalt concrete. This study develops a new approach, based on a derivative of Poisson’s ratio, to characterize the integrity and material damage of asphalt concrete. Fatigue tests are conducted for two mixes at different load levels and temperatures. It is found that a unique relationship exists between the dynamic modulus and strain ratio. Mastercurves are constructed to determine the damage evolution in asphalt concrete during fatigue tests, which provides the basis for developing constitutive models to predict the fatigue life of asphalt pavement.
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References
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 7 • July 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 25, 2013
Accepted: Oct 28, 2013
Published online: Oct 30, 2013
Published in print: Jul 1, 2014
Discussion open until: Sep 4, 2014
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