基于表面能理论的沥青混合料抗剥落性能

Anti stripping of Asphalt Mixture Based on Surface Energy Theory

摘要:

基于表面能理论和黏附剥落模型，采用Wilhelmy吊片法和躺滴法分别测试沥青与集料的表面能参数，计算沥青与集料的黏附功、剥落功及沥青混合料水稳定性评价指标ER，对在不同条件下、掺加不同抗剥落剂的沥青混合料的水稳定性能进行分析.结果表明：基于黏附剥落模型的评价指标ER与反映沥青混合料水稳定性的宏观指标之间存在良好的相关性，ER值越大，沥青混合料的抗剥落性能越好；抗剥落剂能够有效提高沥青的表面能，提升沥青自身的黏聚功以及沥青与集料的黏附功，降低水对沥青与集料的剥落功，从而改善沥青混合料的水稳定性能；经历热老化、浸水、冰冻和冻融条件后，抗剥落剂仍能对沥青混合料的水稳定性起到改善效果.

Abstract:

Wilhelmy plate method and sessile drop method were used to test the surface energy parameters of asphalt and aggregate, based on surface energy theory and adhesion peeling model. Adhesion and peeling work, as well as the evaluation index ER, could be calculated to analyze the water stability and mechanism of asphalt mixture with different kinds of anti stripping agent in different condition. The results show that the aggregative index ER based on adhesion and peeling work can well reflect the water stability of asphalt mixture. The larger ER is, the better it resists water. Anti stripping agent can increase the surface energy by improving cohesiveness and adhesion work and reducing peeling work so that the water stability can be improved. Anti stripping agent can still work after thermal aging, water immersion, and freeze thaw.