Quasi-Microstructure Analysis of Asphalt Mixtures Containing Reclaimed Asphalt Pavement
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
The nonuniform distribution of reclaimed asphalt pavement (RAP) in asphalt mixtures can affect stiffness values of RAP mixtures and their field performance in asphalt overlays. This study develops a method that uses finite-element (FE) analysis of the quasi-microstructure of RAP mixtures to predict their stiffness values and evaluate the performance of the asphalt overlays that contain RAP mixtures. Laboratory experiments are conducted to determine the dynamic modulus values of the corresponding RAP mixtures, which are compared with the predicted stiffness values. The results show that the proposed quasi-microstructure analysis is a reliable approach to predict stiffness values of RAP mixtures and can investigate the direct correlation between RAP distributions and the stiffness values under indirect tensile (IDT) test quantitatively. The quasi-microstructure analysis of RAP mixtures’ overlays shows that the addition of RAP in asphalt mixtures can improve the rutting resistance but significantly increases the cracking potential. The proposed methodology offers a promising and cost-efficient approach to analyze and design RAP mixtures.
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Acknowledgments
The authors would like to thank staffs from Poe Asphalt Paving in Pullman, WA for providing the laboratory materials used in this study.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 5, 2016
Accepted: Apr 26, 2017
Published online: Jul 17, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 17, 2017
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