Compact ultrathin overlay asphalt mixture and preparation method thereof

The invention relates to a compact ultrathin overlay asphalt mixture. The compact ultrathin overlay asphalt mixture is prepared from 100 parts of mineral aggregate, 6 to 8 parts of SBS modified asphalt, 0.12 to 0.48 part of a high-viscosity agent, 0.018 to 0.048 part of a warm mixing agent, 0.12 to 0.64 part of a high-elasticity agent and 0.3 to 0.45 part of basalt fiber. The proportions of the components are configured through a large number of experiments, the high temperature, low temperature, water stability, anti-fatigue performance and anti-scattering performance of the finally obtained compact ultrathin mixture are all higher than standard requirements, the asphalt mixture is a small-particle-size dense-graded mixture and has the advantages of being easy to compact, resistant to sliding, capable of reducing noise and the like, the thickness ranges from 0.8 cm to 1.5 cm, the maintenance cost is low, the high-temperature stability and the crack resistance of the mixture can be improved by adding the basa