Viscoelastic Model of Asphalt Mixtures under Repeated Load
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 10
Abstract
Repeated loading test has been widely used to simulate the true stress state of pavement materials under traffic loading with more accuracy. In this paper, a half-sinusoidal load with 0.1-s loading duration and 0.9-s rest period was selected to simulate the dynamic traffic loading. A generalized Kelvin viscoelastic model of asphalt mixtures based on linear-superposition principle under repeated load is developed. The Prony-series coefficients of the generalized Kelvin model are obtained by the static creep tests of AC-13C and AC-20C unmodified and modified asphalt mixtures. Then, the strain of AC-13C and AC-20C asphalt mixtures under repeated load could be predicted by the proposed viscoelastic model. Comparing the predicted strain obtained by retardation-time spectrum having and not having fixed time with the measured strain, it is believed that the retardation-time spectrum covering both the loading and unloading time processes should be selected in predicting strain of asphalt mixtures under repeated load. The proposed generalized Kelvin viscoelastic model under repeated load allows for prediction of permanent deformation of asphalt mixtures as well as rutting in asphalt pavement.
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Acknowledgments
The authors gratefully acknowledge the financial support of the project by the National Natural Science Foundation of China (51038004).
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 10 • October 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 12, 2014
Accepted: Dec 4, 2014
Published online: Jan 21, 2015
Discussion open until: Jun 21, 2015
Published in print: Oct 1, 2015
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