运行15年的某华东海港码头氯盐腐蚀特点

Chloride salt corrosion characteristics of a seaport wharf in the east of China after 15 years' service

对华东地区运行15年的某海港码头的构件腐蚀特点进行了调查,调查结果表明,构件的力学性能和保护层厚度基本满足设计要求,但构件电阻率测试值较低,存在腐蚀的可能性;构件的游离氯离子浓度与总氯离子浓度存在一定关系,游离氯离子浓度计算的扩散系数小于总氯离子计算的扩散系数;随着高程的增加,构件的表面氯离子浓度具有降低的趋势;构件混凝土抗氯盐侵蚀存在一定的差别。

The corrosion characteristics in the east of China after 15 years＇ service was widely surveyed and researched.The results show as follows：Compressive strength of members and concrete cover of members can meet the design demand but member＇s resistivity is small;there is correlation between free chloride concentration and total chloride ions concentration and free chloride＇ diffusion coefficient is smaller than total chloride ions＇;surface chloride ions concentration reduces as elevation increases;the quality and corrosion resistance to chloride salt of members is different.