摘要
介绍了沥青的老化过程,针对道路沥青的特点,分别用热氧老化试验、光氧老化试验室内模拟沥青的"短期老化"和"长期老化";采用热氧老化、光氧老化的试验方法,对重交通沥青AH-70和AH-90在热氧老化和光氧老化过程中各项指标的变化规律进行了对比分析。结果表明:随着老化时间的增加,AH-70和AH-90沥青的针入度降低,延度减小,软化点升高,粘度增大;在相同条件下,AH-70号沥青的抗热氧老化和抗光氧老化的能力要强于AH-90号沥青;紫外光也会使沥青产生老化现象,但温度是沥青老化的主要因素。
The process of asphalt ageing was introduced; thermal oxidation and photo oxidation were used to simulate short -term ageing and long- term ageing in laboratory respectively according to the characteristic of road asphalt. There were analyses on the change law of various indexes in the ageing process of AH -70 and AH -90, and a contrast with the test results between thermal oxidation and photo oxidation. The result showed that softening point and viscosity increased, penetration and ductility decreased with the ageing time of AH -70 and AH -90 increase. The thermal oxidation resistance and the photo oxidation resistance of AH -70 were stronger than AH -90 in the same condition. Ultraviolet could make asphalt aged, but temperature was the main factor result in asphalt ageing.
出处
《石油沥青》
2009年第4期14-18,共5页
Petroleum Asphalt
关键词
老化
室内模拟
热氧老化
光氧老化
Ageing
Laboratory simulation
Thermal oxidation
Photo oxidation
