化冰盐环境下钢筋混凝土桥梁结构承载力退化试验

Experiment of degradation of steal reinforced concrete bridge structure bearing capacity in deicing salt environment

在冰冻灾害等极端天气条件下,采用化冰盐解除道路交通危机成为中国北方冬季道路除冰雪常用的举措.本课题采用锈蚀和冻融两种环境的叠加来模拟化冰盐环境,通过对相同锈蚀条件下冻融梁和非冻融梁的对比试验,研究化冰盐环境下钢筋混凝土梁剩余承载力的退化.结果表明,模拟的化冰盐环境下,经受冻融循环的试验梁比非冻融循环试验梁承载力下降了13.6%;根据试验结果,将钢筋质量锈蚀率换算成钢筋半径锈蚀率,得出化冰盐环境下梁剩余承载力与半径锈蚀率的关系.

In extreme weather conditions such as frozen disaster, the use of deicing salts for relieving traf- fic crisis has become common deicing measure in China＇s northern winter. In this research project, both corrosion and freeze-thaw cycle environments are combined to simulate the deicing salt environment and the comparative test of freeze-thaw cycle beam with non-freeze thaw cycle beam in the same rust-corrosion conditions is carried out to investigate the degradation of residual bearing capacity of reinforced concrete in deicing salt environment. The results show that in the deicing salt environment, compared with non- freeze-thaw cycle beam, the residual bearing capacity of the test beam subjected to freeze-thaw cycle de- creases by 13. 6%. According to the test results, the mass corrosion rate of reinforcing steel is converted into its radius corrosion rate and the relation of residual bearing capacity of the beam to its radius corrosion rate in deicing salt environment is obtained.