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Discrete element model for porous asphalt concrete based on digital images |
1. College of Civil Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China; 2. Kunshan Construct Engineering Quality Testing Center, Kunshan, Jiangsu 215337, China |
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Abstract To analyze the characteristics of porous asphalt pavement in micro-perspective way,X-ray CT technology was used to obtain the internal images of PAC-13, and the image closest to the real gradation was selected to extract aggregate and void structure by stereology after image segmentation. The discrete element model (DEM) was established with pixel side length of 05 mm, and the uniaxial compression virtual experiment was carried out. The results show that the gradation error of 3D reconstructed slice image is nearly 20% smaller than that of transverse scan image, and the reconstructed slice image gradation is more representative. The compressive strength of virtual uniaxial compression test performed by the model is less than 3% different from that of real uniaxial compression test. The model has good reliability,which can provide research basis for studying the internal mesoscopic structure of porous asphalt concrete.
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Received: 29 January 2019
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