Heat Conduction Behaviors in Semiflexible Pavements Using Discrete-Element Method
Publication: Journal of Transportation Engineering, Part B: Pavements
Volume 149, Issue 3
Abstract
Semiflexible pavement (SFP) includes asphalt mixture skeleton, cement mortar, asphalt mortar, and residual voids. The heat conduction behaviors in the SFP become very complicated. To understand the heat conduction behaviors in the SFP, the discrete element model (DEM) of SFP was first established. Then the heat conduction behaviors, temperature field distribution, and effects of residual pores on heat conduction were investigated. Results indicate that the temperature field distribution at the same pavement depth is relatively uniform, and the heat conduction mainly happens in the vertical direction. The aggregate requires more heat to rise temperature, successively followed by asphalt mortar and cement mortar. The aggregate requires longer heat conduction time, but which does not affect the whole heat transfer. Also, when there are residual pores in the SFP, the temperature at the pore top is higher and the temperature at the pore bottom is lower than that at the same pavement depth without pores due to the thermal resistance of pores, respectively. Furthermore, the larger the pore size is, the higher the temperature difference is. Finally, when the pore is closer to pavement surface, the temperature difference between pore bottom temperature and other temperature at the same pavement depth without pores becomes higher. It is proposed that the large residual pore should be avoided or decreased to reduce the distresses of SFP.
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Data Availability Statement
No data, models, or code were generated or used during the study.
Acknowledgments
This work was supported by National Natural Science Foundation of China (No. 51978340), and Jiangsu Provincial Department of Education for the Qing Lan Project. Also, we would like to thank Advanced Analysis & Testing Center of Nanjing Forestry University for the assistance in experiments.
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Published In
Journal of Transportation Engineering, Part B: Pavements
Volume 149 • Issue 3 • September 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jun 13, 2022
Accepted: May 26, 2023
Published online: Jul 12, 2023
Published in print: Sep 1, 2023
Discussion open until: Dec 12, 2023
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