受氯离子严重腐蚀的钢筋混凝土结构检测加固研究

以钢筋混凝土结构受氯离子严重腐蚀的典型工程实例为基础,对该工程进行了全面检测与鉴定。根据鉴定结果,对工程采用不同的加固方法进行了处理,并于2004年4月对采取加固处理后的效果进行了现场调查与试验分析,得出氯离子渗透的双向扩散过程和氯离子最大含量在离混凝土表面40mm左右位置的规律。氯离子腐蚀环境中加固设计时,钢筋保护层厚度取60mm是比较合理的,有条件时可适当加大。调查与试验结果还表明,氯离子侵蚀严重时,钢筋混凝土结构在进行加固设计时宜采用加大截面法。

Strengthening Design and Experimental Study of RC Structures Suffered from Serve Corrosion of Chloride

Based on the local survey and appraisal of a representative engineering structure suffered from serve rebar corrosion by chloride,the project has been performed by different strengthening methods.Local investigation and experimental analysis in 2004 show that two directions diffusion process and the maximum content of chloride lie in about 40mm from the surface of concrete and the cover thickness of rebar should be more than 40mm(taking 60mm is more suitable),and in serve environment,increasing section method could be adopted in RC strengthening.