摘要
因沥青老化造成的路面病害已逐渐加剧,通过设计不同的试验方案模拟沥青老化的全过程,揭示沥青老化对其性能影响的规律。结果表明:沥青在存储阶段的老化对沥青路面的老化贡献最少,而在施工过程中因沥青与空气接触,沥青老化现象明显,热氧化老化、紫外线老化对沥青延度变化影响最大,这也是导致路面开裂的主要原因。同时,经不同的老化方案后,沥青的135℃旋转粘度均呈明显的增加趋势,低温蠕变劲度也因不同老化方案呈现出不同的变化趋势。
The diseases caused by asphalt aging on pavement have gradually increased, and this paper simulate the whole process of the asphalt aging through the design of different test programs to reveal asphalt aging process and its performance impact rule. The results show that that the contribution of the asphalt aging during storage stage has minimal contribution to asphalt pavement aging, because of contact of the asphalt with the air during construction process, the asphalt aging phenomenon is obvious, thermal oxidative aging and UV aging have greatest impact on asphalt ductility, which is the main reason leading to pavement cracking. Meanwhile, in various aging programs, the rotary viscosity of the asphalt shows a significant increase trend at 135℃, but also, low temperature creep stiffness has different change trends depending on the aging programs.
出处
《路基工程》
2017年第3期129-132,共4页
Subgrade Engineering
关键词
沥青路面
沥青混合料
老化全过程
软化点
针入度
延度
旋转粘度
低温蠕变劲度
asphalt pavement
asphalt mixture
whole aging process
softening point
penetration
ductility
rotary viscosity
low temperature creep stiffness
