The invention relates to a high-utilization-rate RAP
asphalt regenerant and a preparation method thereof. The regenerant comprises the following components in percentage by
mass: 30%-50% of a
petroleum-based softener, 10%-20% of
biomass oil, 5%-15% of a
polymer modifier, 1%-5% of a surfactant, 0.5%-2% of an
antioxidant and 2%-10% of a functional additive. All the components have a synergistic effect, so that the
asphalt modifier can effectively permeate aged
asphalt, supplement light oil, reduce
viscosity, recover flexibility and remarkably improve high-temperature
rut resistance and low-temperature
crack resistance of regenerated asphalt. By reasonably selecting the raw materials and proportioning, the production cost is reduced, the RAP
utilization rate is improved, and the environment-friendly raw materials are adopted, so that the requirements of environmental regulations are met. The result of the embodiment shows that after the regenerant is added, the
performance recovery of the aged asphalt is good, the
viscosity of the regenerated asphalt mixture is moderate, the
needle penetration recovery rate is high, the
softening point is high, the
ductility is large, the comprehensive performance is excellent, and the regenerant is superior to commercially available products.