Directional difference of water permeability of porous asphalt mixture and influence of pore structure

被引：1
|
作者：
Chen J. [1 ]
Yao C. [1 ]
Zhou R. [1 ]
Xu T. [2 ]
Huang X. [3 ]
机构：
[1] College of Civil and Transportation Engineering, Hohai University, Nanjing
[2] School of Civil Engineering, Nanjing Forestry University, Nanjing
[3] School of Transportation, Southeast University, Nanjing
来源：
| 2018年 / Southeast University卷 / 48期
关键词：
Directional difference; Interconnected pore; Permeability; Pore structure; Porous asphalt mixture;
D O I：
10.3969/j.issn.1001-0505.2018.05.020
中图分类号：
学科分类号：
摘要：
To analyze the directional difference of water permeability of porous asphalt mixture and the influence of pore structure, a self-developed permeameter was used to measure the permeability in twenty-four directions of OGFC-13 and OGFC-10 with four air void contents. The three-dimensional (3D) pore structure of OGFC-13 with four air void contents was reconstructed by using computed tomography(CT) technology and image processing. After the interconnected pores were extracted, the pore structure index which affects the water permeability directional difference of mixture was analyzed. The results show that the permeability of porous asphalt mixtures has an obvious directional difference. In the vertical plane, the maximum value of permeability occurs in the horizontal direction. In the horizontal plane, the permeability has a directional difference, but has no obvious relationship with directions. The increase of the air void content and the nominal maximum aggregate size can reduce the directional difference. Compared with the horizontal interconnected pores, vertical pores in mixtures have a larger hydraulic diameter, less quantity and length, which is the main reason for the water permeability directional difference of porous asphalt mixture. © 2018, Editorial Department of Journal of Southeast University. All right reserved.
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页码：920 / 926
页数：6
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