混凝土中钢筋脱钝的电化学弱极化判别方法  

Distinguishing the depassivation of rebar in concrete with weak polarization method

作　　者：许晨[1] 金伟良[1] 王传坤[1] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310027

出　　处：《交通科学与工程》2009年第4期31-36,共6页Journal of Transport Science and Engineering

摘　　要：基于电化学弱极化原理,提出了一种新的钢筋脱钝判别方法,并通过实验验证了该方法的有效性.该方法巧妙地回避了计算电化学参数带来的繁琐,只需记录阳极极化结束时刻的外极化电流,通过观测极化电流的突然增大即可判定钢筋脱钝.此外,该方法克服了半电位方法受环境波动影响较大的缺点.该方法对钢筋施加的是弱极化,对钢筋表面扰动很小,不会破坏钢筋表面原有的特性.Based on the principle of electrochemical weak polarization,a new method has been proposed to distinguish the depassivation of rebar in concrete. Experiments have been done to verify the effectiveness of this method. This method can be operated very easily just like Half-cell method,as we do not need to calculate any electrochemical parameters. What＇ s more,this method overcome the shortcomings of Half-cell method that results may be influenced by envi- ronmental fluctuation. Furthermore, because of the weak polarization, there is small perturbation on the steel surface, so the original superficial characteristics of rebar will not be damaged.

关 键 词：钝化 脱钝 氯离子阈值 电化学 弱极化技术 

分 类 号：U445.73[建筑科学—桥梁与隧道工程]