Evotherm温拌橡胶沥青的老化特性及红外光谱分析

Aging characteristics and infrared spectrum analysis of Evotherm warm mix rubber asphalt

模拟Evotherm温拌橡胶沥青热-氧-水浸老化试验,采用红外光谱考察Evotherm温拌橡胶沥青在水老化过程中各组分及官能团的变化。结果表明,Evotherm温拌橡胶沥青水老化前后吸收峰的形状和官能团的位置相似,未生成新的官能团。Evotherm温拌橡胶沥青在热-氧-水老化条件下,以氧化反应为主;老化5 h后,芳香分、沥青质增多,饱和分减少;老化后,羟基和羰基变得更加突出,亚砜基变化不明显;热-氧-水浸环境下的含氧官能团比热-氧-水蒸气环境下的含氧官能团含量更多;采用羰基和碳氢键峰面积表征Evotherm温拌橡胶沥青的水老化更合适。

In order to study the effect of water on the aging of Evotherm warm mix rubber asphalt,water aging test of Evotherm warm mix rubber asphalt was simulated,and the changes of components and functional groups of Evotherm warm mix rubber asphalt during the water aging process were analyzed by infrared spectrum.The results showed that the shape and position of the absorption peaks of Evotherm warm mix rubber asphalt before and after water aging were similar,and there were no new functional groups.Evotherm warm mix rubber asphalt was mainly oxidized under the combined aging of heat,oxygen and water.After Evotherm warm mix rubber asphalt had been suffered heat-oxygen-water immersion aging for 5 h,the aromatics and asphaltene increased,but the saturates decreased.The hydroxyl and carbonyl became more prominent,while sulfoxide did not change significantly.The oxygen-containing functional groups in the heat-oxygen-water immersion environment were more than those in the heat-oxygen-vapor environment.The carbonyl and carbon-hydrogen bond area were more suitable to characterize the water aging of Evotherm warm mix rubber asphalt.