Experimental and Numerical Investigation of Dilation Behavior of Asphalt Mixture
Publication: International Journal of Geomechanics
Volume 17, Issue 2
Abstract
Dilatancy behavior plays a key role in asphalt mixture rutting. Therefore, it is important to understand the mechanism of dilation for asphalt pavement design. In this study, material dilation was approached by considering different stress–dilatancy models. The uniaxial compressive test was employed to measure the dilation of asphalt mixtures under various test temperatures. Radial and volumetric deformations of asphalt mixture specimens were obtained in a multifunctional material system using special radial displacement transducers. The testing results were interpreted through dilatancy theory. The experimental results show that the softening point of asphalt played an important role in the dilation behavior of asphalt mixtures. Analysis suggests that the dilation was governed by the kinematic constraints imposed by the aggregate skeleton. The constitutive relationship of dilation of asphalt mixtures that can be used to describe both the contraction and dilation is discussed by considering material composition and test conditions. A digital specimen of an asphalt mixture was established by a discrete-element modeling (DEM) and incorporated aggregate of irregular shape, the asphalt mortar phase, and the air void phase. Results show that the virtual specimen exhibited similar dilatancy to the lab-compacted specimen in triaxial compression tests.
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Acknowledgments
The authors gratefully acknowledge the funding from the National Natural Science Foundation of China (No. 51078089) and the Excellent Doctoral Dissertation funding provided by Southeast University (No. YBJJ1347). The authors thank anonymous reviewers for their insightful comments and suggestions that have helped to improve the clarity and quality of this manuscript.
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Published In
International Journal of Geomechanics
Volume 17 • Issue 2 • February 2017
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Mar 6, 2014
Accepted: May 26, 2016
Published online: Aug 3, 2016
Discussion open until: Jan 3, 2017
Published in print: Feb 1, 2017
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