长安大学 特殊地区公路工程教育部重点实验室,长安大学 特殊地区公路工程教育部重点实验室,甘肃省公路管理局,长安大学 特殊地区公路工程教育部重点实验室,甘肃省高等级公路建设开发有限公司
Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University,Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University,Gansu Province Administration Bureau of Highway,Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang’an University,Gansu Highway Construction ＆ Development Co., Ltd. in Gansu Province
The purpose of this paper is to use dynamic characterization model to evaluate the dynamic process of asphalt aging and compare the pros and cons of different asphalt. First, the RTFOT aging tests at different aging time for four kinds of asphalt are carried out and the aging test data are fitted with dynamic characterization model. As a result, the aging parameters and aging equation of penetration, ductility, softening point and viscosity of different asphalt are determined. Then, grey relational evaluation method is used to evaluate the anti-aging performance of different asphalt, which setting the aging parameters L and r of penetration, ductility, softening point and viscosity as the evaluation indexes. The results show that: the aging rate of penetration, softening point, ductility of asphalt reaches the peak at the beginning and becomes smaller as the variation of aging time and balances at last; The aging process of asphalt can be described accurately by dynamic characterization mode and parameters L and r can be a good characterization of aging degree and aging rate; The sort of anti-aging properties of the four asphalt is determined as following: the indoor modified asphalt is better than matrix 90 asphalt and better than SBS modified asphalt and better than matrix 70 asphalt.