Analysis of Pore Characteristics and Flow Pattern of Open-Graded Asphalt Mixture in Different Directions
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 9
Abstract
The permeability of porous asphalt pavement is an important hydraulic property that is affected by the microstructure of connected pores. This paper investigates the pore characteristics and water flow pattern of open-graded friction course (OGFC) mixture using image analysis and numerical simulation. Firstly, four groups of OGFC samples were scanned by computational tomography (CT) to obtain the pore distributions and the shape parameters of voids (number of voids per unit area, the area ratio of voids to cross section, the equivalent circle diameter, and the ratio of the long and short axis in equivalent ellipse) along both horizontal and vertical directions. Secondly, the three-dimensional (3D) pore structure of the OGFC mixture was reconstructed by an image-processing technique. The connected pores were separated, and the pore length, pore curvature, and hydraulic diameter were calculated and analyzed. Finally, the two-dimensional (2D) water flow in pore structures was simulated. The results showed that the length and curvature of horizontal pores were larger than those of vertical pores, but the diameter was smaller for horizontal pores. It was found that pores had different distribution characteristics in the horizontal and vertical directions. The pore length and curvature along the vertical direction of the OGFC mixture were smaller than those along the horizontal direction, but the hydraulic diameter along the vertical direction was larger than that along the horizontal direction. The simulation results showed that the water flow rate in the horizontal direction was greater than that in the vertical direction when the gravity is not considered. With the increase of water pressure and the decrease of void ratio, the difference between horizontal and vertical flow rates became greater.
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Data Availability Statement
The algorithms used to calculate the pore characteristics of the microstructure are available from the corresponding author upon reasonable request.
Acknowledgments
This study was partially supported by the Natural Science Foundation of Jiangsu Province (No. BK20191300), the Fundamental Research Funds for Central Universities (No. 2019B12714), and the University Transportation Center program through the Center for Advanced Infrastructure and Transportation (CAIT) at Rutgers University.
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Oct 28, 2019
Accepted: Mar 2, 2020
Published online: Jun 29, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 29, 2020
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