基于CT图像分维估算的沥青混凝土损伤演化研究

Research on Micro-Structure Evolution of Asphalt Mixture Based on Estimation of Fractal Demensions of CT Image

在对沥青路面芯样进行轴向压缩疲劳试验时,结合CT扫描技术拍摄了不同疲劳阶段下沥青混凝土的细观结构图像,综合应用图像分析技术和分形理论,估算了细观结构图像的分形维数,并简要分析了沥青混凝土材料的细观结构演化特征.结果表明,定义的分形维数随着损伤的演化发展逐渐增加,可将细观结构分维值作为研究沥青混凝土细观缺陷演化的定量指标.

Meso - structure images of a asphalt mixture under various fatigue levels ate investigated by using CT （Computerized Tomograph） searming in fatigue experiment of asphalt mixture. The fraetal dimensions of these mesostructure images are estimated by image analysis and fraetal theory. On the basis of the fractal dimension of meso - struclure, the characteristics of the evolution of meso - structure ate quantitatively analyzed. It is shown that the value of fractal dimensions,derived by the CT image,increases with the evolution of the damage in asphalt mixture. It has suggested that the fraetal dimensions defined in the paper can be used as parameter of damage in asphalt mixture. The equation of damage ew;lution is -brained based on the change of fractal dimension.