This invention pertains to compositions of polymeric compounds, specifically a recycled rubber
powder modified
asphalt based on a renewable composite activator, its preparation method, and its application. The recycled rubber
powder modified
asphalt comprises a base
asphalt and activated rubber
powder in a
mass ratio of 1:(0.2~0.3). The activated rubber powder comprises waste tire rubber powder and a composite activator in a
mass ratio of 10:(0.8~1.5). The composite activator comprises an organic phase and an inorganic phase in a
mass ratio of (1.5~3):1. The organic phase is a
chitosan-
amino acid derivative, and the inorganic phase is a layered bimetallic
hydroxide. Compared with existing technologies, the rubber powder modified asphalt prepared by this invention exhibits good high-temperature storage stability and interfacial
structural integrity, demonstrating excellent anti-aging properties and high-temperature rutting resistance during long-term service.