Stochastic Viscoelastic–Viscoplastic Response of Asphalt Mixture under Uniaxial Compression
Publication: Journal of Engineering Mechanics
Volume 143, Issue 8
Abstract
The mechanical properties of asphalt mixture always exhibit large degrees of variability due to asphalt’s random internal structure. A stochastic constitutive model is proposed to describe the random mechanical response of an uniaxially compressed asphalt mixture. In this model, the simplified Schapery’s nonlinear viscoelastic model and the modified Swchartz’s viscoplastic model are combined to estimate the material average deformation, and a random parameter with lognormal probability distribution is introduced to reflect the specimen dispersion. Based on statistical methods, the model is calibrated by the multiple-stress repeated creep-recovery test and the 1-h creep test, and then validated by the irregular loading test and the uniform repeated creep-recovery test. It is shown that the model can predict not only the average mechanical behavior but also the scattering range of the material responses at a certain probability.
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Acknowledgments
This work is supported by the National Natural Science Foundations of China (Nos. 10872073 and 11602178) and Hubei Provincial Natural Science Foundation of China (No. 2015CFB205).
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Published In
Journal of Engineering Mechanics
Volume 143 • Issue 8 • August 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 27, 2014
Accepted: Dec 5, 2016
Published ahead of print: Mar 21, 2017
Published online: Mar 22, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 22, 2017
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