Development and Mechanism Analysis of High Temperature Resistant Nanocomposite Modified Asphalt

Abstract

With the intensification of global warming, continuous extreme high temperature weather occurs frequently, and asphalt materials are prone to softening under continuous high temperature conditions, which can easily cause traffic accidents. Therefore, it is necessary to develop a high-temperature resistant modified asphalt. This study focuses on the research and development of high-temperature resistant nanocomposite modified asphalt under sustained extreme high temperature weather conditions, selects nanocomposite modification schemes, conducts aging, dynamic shear creep, bending small beam, and segregation tests on nanocomposite modified asphalt, comprehensively analyzes the aging resistance, segregation resistance, and high and low temperature performance of nanocomposite modified asphalt, and analyzes the mechanism of nanocomposite modified asphalt from the perspective of molecular dynamics. The research results indicate that the nano/polymer composite modification scheme for sustained extreme high temperature areas is: 3% ZnO+0.5% TiO2+3.5% SBS; The aging resistance and high temperature resistance of nanocomposite modified asphalt are obviously better than that of base asphalt; At a temperature of 413K (160℃), a more stable structure can be formed between asphalt and SBS. At a temperature of around 140℃, each interaction can reach its maximum value, and the modification effect is good.