沥青高温老化机理研究

Study of Asphalt Aging Mechanism by High Temperature

该文介绍一项沥青高温老化机理的试验研究。采用旋转薄膜烘箱在高于160℃环境中快速老化沥青试验是研究沥青高温老化的主要途径，具有简单、高效及快捷等特点，但这种方法没有模拟低于160℃高温老化情况，存在测试温度范围窄、真实性偏弱等缺点。采用普通烘箱老化沥青，研究与分析120—180℃不同温度、不同时间沥青质量损失的情况，发现低于160℃的温度条件下，沥青老化以轻质组分挥发为主，质量损失可高达1．5％；高于160℃条件下，轻质组分与”吸氧”化学反应同时存在，且温度越高，“吸氧”反应越剧烈。

The fast aged asphalt test by rolling thin film oven in the environment higher than 1600 C is the main way to study the asphalt high temperature aging, and has the simple, high efficient and fast characteristics. But this method can not simulate the aging situation of high temperature lower than 1600 C, and has the disadvantages of narrow temperature testing range, weak authenticity and ext. The article studies and analyzes the quality loss of asphalt by the ordinary oven to age asphalt from 120℃ to 180℃ at different temperature and time. The result shows that the asphalt aging is mainly lightweight component volatilization and the quality loss can be 1.5% in the temperature lower than 1600 C, and the lightweight component and the'oxygen uptake'chemical reaction coexist in the temperature higher than 1600 C. Otherwise, the higher is temperature, the more severe is'oxygen uptake'reaction.