Abstract：Existing durability studies on concrete bridge structures mainly focus on monolithic concrete without considering the effect of joints. Experimental research was carried out to investigate the durability of joints commonly used in concrete bridges, including the direct wet joints, roughened wet joints, dry joints and epoxied joints. By subjecting the joints to chloride ion penetration, carbonation, frost, and reinforcement corrosion, some conclusions are obtained. All types of joints are the most weak positions of concrete, although their durability is different from each other. Although, the new-old concrete interface can be densified by mechanical roughening, initial damage on the interface will emerge, and the durability of concrete will be damaged. Dry joints should not be used in severe environments since their durability indicators are obviously inferior to those of other joints. The durability of epoxied joints is not as satisfied as expected, so further research should be conducted. Reinforcements, including strainless steel reinforcements, at joints can effectively reflect more severe corrosion than monolithic concrete. The cement layer on the interface or the construction damage is responsible for the degradation of the resistance of joints to environments. Therefore, the durability research of concrete should be paid more attention to the joints, and relevant measures should be developed at the stages of design, construction, and maintenance.
李国平 胡皓 任才 周诗云 黎金星. 桥梁混凝土结构接缝的耐久性能[J]. 土木工程学报, 2018, 51(7): 98-103.
Li Guoping Hu Hao Ren Cai Zhou Shiyun Li Jinxing. Study on durability of joints in concrete bridge structures. 土木工程学报, 2018, 51(7): 98-103.
