Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (11): 3192-3198.doi: 10.13229/j.cnki.jdxbgxb.20230631

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Fatigue damage evolution of asphalt concrete based on CT 3D reconstruction technology

Xing-lin ZHOU1,2,3(),Yang LIU1,2,3,Lu LIU1,2,3   

  1. 1.School of Mechanical Automation，Wuhan University of Science and Technology，Wuhan 430081，China
    2.Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering，Wuhan University of Science and Technology，Wuhan 430081，China
    3.Key Laboratory of Metallurgical Equipment and Control Technology，Ministry of Education，Wuhan University of Science and Technology，Wuhan 430081，China
  • Received:2023-06-20 Online:2024-11-01 Published:2025-04-24

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Abstract:

Due to the extremely complex internal structure of asphalt concrete， it exhibits different changing characteristics at different fatigue stages. In order to obtain the fatigue damage evolution process of asphalt concrete， research was conducted based on CT three-dimensional reconstruction technology. Conducting fatigue tests on asphalt concrete， obtaining CT scan images and 3D reconstruction images of different fatigue stages； The difference box dimension method is used to calculate the Fractal dimension of 3D CT reconstruction image， and the relationship between fatigue damage times and Fractal dimension is obtained； Using Miner's linear fatigue damage model to redefine the damage variables of asphalt concrete， it is concluded that the fatigue damage evolution process exhibits linear changes. By constructing epoxy asphalt concrete specimens for experimental testing， the results show that the proposed method can accurately calculate the relationship between compressive displacement and crack volume of asphalt concrete and fatigue damage， and infer the fatigue damage evolution process of asphalt concrete.

Key words: CT 3D reconstruction technology, fatigue damage of asphalt concrete, damage variables, linear variation

CLC Number: 

  • U334

Fig.1

3D Reconstruction process of asphalt concrete CT"

Table 1

Fractal dimension of CT images in different fatigue stages"

疲劳阶段分形维数
初始状态2.49
加载150万次2.50
加载300万次2.52
加载350万次2.56
加载450万次2.60

Fig.2

Relationship between fatigue damage times of asphalt concrete and Fractal dimension"

Fig.3

CT scan results of asphalt concrete specimens"

Fig.4

Curve of variation between compressive displacement and crack volume of asphalt concrete"

Table 2

Relationship between static load and moving load at different vehicle speeds"

车速/

（km·h-1）

沥青混凝土

竖向位移/mm

与静力作用

相比/%

201.40+7.7
601.44+10.8
1001.57+20.8
1401.72+32.2

Fig.5

Diagram of the relationship between compressive displacement and fatigue damage"

Fig.6

Diagram of the relationship between crack volume and fatigue damage"

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