Composite fiber modified SMA asphalt mixture and preparation method thereof

The invention discloses a composite fiber modified SMA asphalt mixture and a preparation method thereof, and belongs to the technical field of asphalt mixture processing. The composite fiber modified SMA asphalt mixture is used for solving the technical problem that the bearing capacity, the shear strength, the water damage resistance and the freeze-thaw resistance of an asphalt mixture in the prior art need to be further improved. Comprising the following components in parts by weight: 50-60 parts of composite fiber, 500-600 parts of aggregate, 25-35 parts of an additive, 250-350 parts of SMA asphalt and 50-80 parts of rubber powder. According to the invention, the asphalt mixture is modified by preparing the admixture, the dimensions of the glass fibers and the basalt fibers are optimized, and the surfaces of the glass fibers and the basalt fibers are modified, so that the rutting resistance, the shear strength and the freeze-thaw resistance of the asphalt mixture are effectively improved, and the water dam