Molecular Simulations of Anti-aging Mechanisms on Nano-LDHs Modified Asphalt

摘要

Aging of asphalt is a serious problem of asphalt damage and occurs throughout its service life. In general, a common method is to use different additives or modifiers for anti-aging. The objective of this study was to investigate the effects of layered double hydroxides(LDHs) additives on anti-aging mechanism using molecular simulations. Molecular dynamic simulations were used to simulate the changes of physical properties and structure before and after aging. Results showed that the degradation of asphalt was dominant reaction and modified asphalts had a high-temperature stability at thermal aging without oxygen. Owing to the difference of polarity between LDHs and asphalt components, phase separation phenomenon would occur at thermal oxidative aging. LDHs also increased the orderliness of asphalt binder.