Abstract

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Title:: Pavement performance and modified mechanism of rubber powder and SBS compound modified asphalt mixture in seasonal freezing region

Author(s):: YANG Guang; SHEN Ai-qin; CHEN Zhi-guo; YU Li-mei; GUO Yin-chuan; 1. School of Highway, Chang’an University, Xi‘an 710064, Shaanxi, China; 2. Jilin Provincial Communication Planning and Design Institute, Changchun 130021, Jilin, China; 3. Jilin Provincial Transport Scientific Research Institute, Changchun 130021, Jilin, China

Keywords:: road engineering; seasonal freezing region; rubber powder and SBS compound modified asphalt; asphalt mixture; modified mechanism; pavement performance

Abstract:: In order to improve the performance of asphalt pavement in seasonal freezing region, this paper did systematic study on road performance of rubber powder and SBS compound modified asphalt, and proposed the optimum mixing ratio of rubber powder and SBS compound modified asphalt according to special requirements of seasonal freezing region. Performance evaluation of rubber powder and SBS compound modified asphalt mixture was carried out. The modified mechanism of rubber powder and SBS compound modified asphalt was analyzed from the microscopic point of view based on the results of infrared spectroscopy and differential scanning calorimetry test data. The results show that the recommended dosage of rubber powder and SBS composite modified asphalt is 20%-23%, and the recommended dosage of SBS is 2.0%. Rubber powder and SBS composite modified asphalt can greatly improve the road performance of SMA and AC asphalt mixture. Compared with SBS modified asphalt mixture, the improvement of high temperature property reaches to 59%, the improvement of low temperature property reaches to 154%, and the breaking temperature in low temperature reduces by 18 ℃. The system of rubber powder and SBS composite modified asphalt has good thermostability, which is related to the decrease of surface tension between the components.