沥青两次老化规律的对比分析

Analysis of Asphalt Aging Regulations After Two Aging Processes

摘要:

在室内对SHELL 60-80沥青进行2次老化试验,测试2次老化沥青微观性能指标和宏观性能指标的变化,发现沥青的残留粘度比、胶体不稳定指数、分子量分散度与老化时间之间均有一定的指数关系;沥青的微观性能与宏观性能之间存在着线性关系,说明利用宏观性能指标和微观性能指标表示沥青老化规律存在一致性.2次沥青老化的规律相同,但第2次老化过程中老化指标的衰减幅度明显高于第1次老化,说明沥青的抗老化性与老化次数之间存在一定的相关性.

Abstract:

Based on the test of the micro and macroperformances of Shell 60-80 asphalt after two aging processes,an exponential relation is found between residual viscosity ratio, dispersion degree and colloid instability index and aging time.A linear relationship is also found between the micro and macroindexes of asphalt,therefore,microindexes or macroindexes of asphalt can be used to characterize the asphalts’ aging regulation.The decline amplitude in the second aging process is larger than that of the first one,which verifies a correlation between antiaging of asphalt and aging frequency.