摘要
Morphological parameters of coarse aggregates,including the angularity index (Al),flat and elongated ratio,flatness ratio,and sphericity,strongly affect the performance of asphalt concrete.A device must be developed to efficiently and accurately measure these parameters.Herein,a charge-coupled device camera and a linear profile scanner are combined to evaluate the parameters.The Al is calculated using three methods.The results show that the fitted-ellipse method provides superior results among the three Al measurement methods.Moreover,the use of a linear profile scanner improves the Al measurement accuracy.Therefore,the proposed combination has high measurement efficiency and is suitable for batch inspections.
