SMA is a kind of asphalt composed of asphalt, fiber stabilizer, mineral powder and a small amount of fine aggregate. Asphalt mixture composed of resin fills the gaps between coarse aggregate skeletons with discontinuous gradation. It is made of enough asphalt binder and asphalt with considerable rigidity. Grease mucilage is filled in the gap of stone-stone mosaic structure formed by coarse aggregate.
Therefore, it has high and low temperature stability, good water stability, good durability and surface function (anti-sliding, small rutting, high flatness, low noise and good visibility). SMA pavement has good durability, so it has less maintenance workload, long service life and good comprehensive economic and environmental benefits.