The surface morphology of aggregates has a significant effect on the aggregates, which in turn affects the technical performance of asphalt mixtures and cement concrete. In this study, the surface micromorphology (SMM) of a) four typical natural aggregates, b) recycled concrete aggregate (RCA), and c) recycled brick aggregate (RCB) were investigated using laser scanning confocal microscope, and combined with image analysis technology, roughness theory and fractal theory for quantitative evaluation. (nhnhanh)