摘要
在使用普通三电极系统对钢筋混凝土建筑物中钢筋的腐蚀速率进行现场测试时,由于辅助电极的面积与被测钢筋表面积相差很大而造成极化不均匀,实际受到极化的钢筋表面积难以确定。作者提出了普通电极增加屏蔽环的改进方案,并对该方案进行了理论探讨和实验检测。当两辅助电极间距离一定时,屏蔽电极越宽,所得实验值与实际越接近,加入屏蔽电极后,测得的各组腐蚀速率均比未加屏蔽电极时高;每组测试中,第二次所得的腐蚀速率总比第一次大,且第二次响应电流的对称性比第一次高;加屏蔽环电极后所得数据更准确。
When the three electrode system is used to test the corrosion rate of reinforcement in concrete structures, because of the large size difference between the area of secondary electrode and the surface area of referred reinforcement, it is very difficult to decide the real surface area of polarized reinforcement, thus difficult to decide the real corrosion rate. In order to solve the problem, the guard ring method was proposed to confine the electrical signal exactly under the secondary electrode, and thus the surface area of polarized reinforcement is equal to the area of the secondary electrode. A theoretical model was proposed and a set of experiments have been done to test the feasibility of the guard ring method. The results are satisfied with the data accuracy.
出处
《建筑科学》
2002年第5期36-39,共4页
Building Science