基于使用性能的钢桥面铺装环氧沥青混凝土设计

Application Performance-Based Design of Epoxy Asphalt Concrete Applied to Steel Bridge Deck Pavement

针对钢桥面铺装环氧沥青混凝土使用中出现的问题,分析了现有设计理论和方法的不足,采用改进的密断级配CAVF方法来提高环氧沥青混凝土的抗滑性能;基于断裂力学和能量法原理,提出以冲击韧性作为环氧沥青混凝土疲劳性能的评价指标,采用剩余劲度模量比来反映环氧沥青混凝土的疲劳性能,并通过试验建立起冲击韧性和剩余劲度模量比之间的关系.研究结果表明:采用CAVF方法设计的环氧沥青混凝土的抗滑性能明显改善;冲击韧性和疲劳性能之间有良好的线性相关性,采用冲击韧性能够有效地评价环氧沥青混凝土的疲劳性能.

In order to solve the problems existing in the application of epoxy asphalt concrete to steel bridge deck pavement, the shortcomings of the existing design theories and methods are analyzed, and the improved CAVF method is used to increase the skid resistance of the concrete. Then, based on the fracture mechanics and the energy method, the impact toughness is proposed as an evaluation index of the fatigue properties of epoxy asphalt concrete, and the residual stiffness modulus ratio is employed to reflect the fatigue properties. Moreover, the relationship between the impact toughness and the residual stiffness modulus ratio is revealed by tests. The results show that the skid resistance of the epoxy asphalt concrete designed by the CAVF method significantly improves, that there exists a good linear relation between the impact toughness and the fatigue properties, and that the impact toughness can be used to effec- tively evaluate the fatigue properties of epoxy asphalt concrete.