ABSTRACT
In recent years, due to the influence of the global warming, channelization and overloading traffic, all sorts of pavement distresses have occurred on highway asphalt pavement. Especially, the permanent strain of asphalt pavement appears easily in high temperature season. A new type of HR rubber powder composite modified asphalt mixture was researched and developed to solve the problem above. In order to improve the ability of resistance to permanent deformation of asphalt pavement, various influence factors on the ability to resist permanent deformation were studied here. In this study, servo type material dynamic testing system (UTM-25) was used for dynamic creep test, exploring the influences of constituent materials, including mineral aggregate gradation, thickness of rubber powder, fiber types, HR content and the type of asphalt cement, as well as external conditions covering temperature and load, on ability to resist permanent deformation of it. Results indicate that when using SMA, 40 power and 4‰ HR optimum content, HR rubber powder composite modified asphalt mixture can get superior ability to resist permanent deformation with the high performance-to-price ratio. Besides, the ability of resistance to permanent deformation of it has the small correlation with the temperature and load, indicating the lesser sensitivity of the performance. Thus, it completely can be used to solve the problem of insufficient ability to resist permanent deformation of asphalt pavement.
