Research on the Preparation of Graphene Quantum Dots/SBS Composite-Modified Asphalt and Its Application Performance

This study aims to prepare a graphene quantum dots (GQDs)/styrene-butadiene segmented copolymer composite (GQDs/SBS) as an asphalt modifier using the Pickering emulsion polymerization method. The physicochemical properties of GQDs/SBS and their effects on modification were investigated. In addition, was compared with pure SBS modifier. Research results demonstrated that GQDs could be evenly dispersed into phase form uniform composite. Adding brings more oxygen-containing functional groups modifier, thus strengthening polarity making it disperse better. Compared presents better thermostability. Moreover, composite-modified achieves high-temperature performance than SBS-modified asphalt, which is manifested by increased softening points, complex shear modulus rutting factors. However, low-temperature decreases, reductions in cone penetration, viscosity ductility well ratio between creep stiffness (S) rate (m), is, S/m. Furthermore, adding can improve mixture, but influences water stability slightly. also have advantages simple preparation techniques, low cost are environmentally friendly. Therefore, they become beneficial choice cementing material modifiers.