Stone matrix asphalt: it is a skeleton dense structure asphalt mixture composed of high content of coarse aggregate, high content of mineral powder, high content of asphalt and low content of intermediate particle size.

The earliest use of modified asphalt in China is 1992 Capital Airport Expressway, which uses Austrian technology NOVOPHALT. The key technology is to use a large colloid mill with continuously adjustable gap, so that the modifier passes through the mill repeatedly to achieve very uniform mixing with asphalt, and observe whether the crystal structure of the chips is mixed evenly with a 400-fold microscope.

PE is more conducive to improving high temperature stability, SBS is more conducive to improving low temperature stability. 1996 The east runway of Capital Airport was covered with 4%PE+2%SBS and 0.4% asbestos fiber. After using the modifier, the penetration decreased by one grade, the softening degree was greatly improved, and the viscosity was increased by 7 times, which indicated that the high temperature stability of asphalt was significantly improved.

Features of SMA:

Stone matrix asphalt is an internationally recognized (widely used) asphalt pavement mixture with strong deformation resistance and good durability. Due to the good embedding of coarse aggregate, the mixture has very good rutting resistance at high temperature, and at the same time, due to the bonding effect of asphalt mastic, the low temperature deformation performance and water stability are also improved.

Adding fiber stabilizer can keep the high viscosity of asphalt binder and its paving and compaction effect is good. Intermittent grading forms large pores on the surface, which has deep structure and good anti-sliding performance. At the same time, the gap of the mixture is very small, and the aging resistance and durability are very good, which comprehensively improves the road performance of the asphalt mixture.