氯化聚乙烯改性沥青的流变特性与微观结构

 在基质沥青ZH-70I中加入一定量的氯化聚乙烯(CPE)进行改性, 得到改性沥青PMB-CPE, 采用动态力学的方法(DSR法)研究了改性沥青PMB-CPE的流变性能和微观结构. 结果表明, 在PMB-CPE中形成了一种网状结构, 使得PMB-CPE在较高的温度下保持一定的弹性, 改善了耐高温性能. 随着温度的降低, PMB-CPE的损耗角变化较小, 有向弹性体转变的趋向, 从而改善了其柔韧性,提高了抗低温开裂性.

RHEOLOGICAL BEHAVIOR AND MICRO-STRUCTURE OF CHLORINATED POLYETHYLENE MODIFIED BITUMEN

The chlorinated polyethylene modified bitumen （PMB-CPE） was obtained by adding some amount of chlorinated polyethylene into base bitumen ZH-701. The rheological characterization and micro-structure of PMB-CPE was studied by using dynamic mechanical analysis over wide range of temperatures and frequencies. It was found that the polymer net-structure was formed in PMB-CPE, which made the binder elasticity of PMB-CPE increase at high temperature. The phase angle (d) changed a little with the temperature decreasing, showing that there existed the trend to elastic body in PMB-CPE, resulting in its flexibility improved and anti-breakage at low temperature enhanced.