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.