沥青混凝土中粗集料形貌特征分析

In order to investigate the shape characteristics of coarse aggregates in asphalt concrete and their influences on performances of asphalt mixture, asphalt concretes were scanned by industrial CT, and the morphology parameters of the coarse aggregates were obtained from the scanned images by image processing technique and statistical method. The influences of the coarse aggregate level grading on morphology parameters were studied and analyzed. Results showed that CT scanning combined with image processing technique could accurately obtain the coarse aggregate morphology parameters of asphalt concrete. The cumulative distribution probability of the aspect ratio and angularity of coarse aggregate particles obeyed the three-parameter Weibull distribution. Contour fractal dimension, longitudinal/lateral trend parameters, longitudinal declination mean, and area parameters were sensitive to changes in coarse aggregate gradation. The longitudinal/lateral trend parameters, longitudinal declination mean, contour fractal dimension, angularity, and area parameters could significantly characterize changes of the passing rate of the 4.75 mm particle size aggregate.