Investigation of performance and modification mechanism of ceramic-polishing-powder-modified asphalt mastic

In this study, ceramic polishing powder (PP) as an industrial waste product, was treated by a silane coupling agent (KH550) and an NaOH solution, and then it was used to prepare the PP-modified asphalts. The performance of the modified asphalts and their modification mechanisms were examined. The results showed that the optimal preparation process was pre-shearing 15 min, and then shearing 60 min at 145°C, 4000 r/min after adding PP. KH550-PP-modified asphalt exhibited the best high- and low-temperature performances, thermal-oxidative aging resistances and anti-water damage performance and the lowest temperature sensitivity. PP was evenly dispersed in the original asphalt, which increased the bee structure and the surface roughness of the asphalt. The surface modifier changed the surface physical properties of the PP particles, which is helpful to achieve co-melting and blending with the original asphalt. However, an effect on the chemical structures of the composite-modified asphalts was not evident.