海域混凝土桥梁腐蚀及劣化机理研究

Study on corrosion and degradation mechanism of concrete bridges in sea area

通过对某沿海桥梁调研分析,确定了海域混凝土桥梁腐蚀最严重的部位,基于Fick第二定律研究了氯离子侵蚀引起钢筋锈蚀对结构耐久性的影响。计算了不同钢筋锈蚀率情况下钢筋屈服荷载,总结出二者之间的关系。基于已锈蚀钢筋混凝土构件力学性能试验,分析了锈蚀构件刚度演化规律。

Based on the investigation and analysis of a coastal bridge, the most serious corrosive parts of concrete bridges in the sea area are determined. By Fick’s second law, the influence of chloride ion corrosion on the durability of structures is studied. The yield loads of steel bars under different corrosion rates are calculated, and the relationship between them is summarized. Based on the mechanical properties test of corroded reinforced concrete members, the stiffness evolution law of corroded members was analyzed.