The Non-Destructive Test of Steel Corrosion in Reinforced Concrete Bridges Using a Micro-Magnetic Sensor.
This paper presents a non-destructive test method for steel corrosion in reinforced concrete bridges by using a 3-dimensional digital micro-magnetic sensor to detect and analyze the self-magnetic field leakage from corroded reinforced concrete. The setup of the magnetic scanning device and the measurement mode of the micro-magnetic sensor are introduced. The numerical analysis model is also built based on the linear magnetic charge theory. Compared to the self-magnetic field leakage data obtained from magnetic sensor-based measurement and numerical calculation, it is shown that the curves of tangential magnetic field at different lift-off height all intersect near the edge of the steel corrosion zone. The result indicates that the intersection of magnetic field curves can be used to detect and evaluate the range of the inner steel corrosion in engineering structures. The findings of this work propose a new and effective non-destructive test method for steel corrosion, and therefore enlarge the application of the micro-magnetic sensor.
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China. superww058@163.com.
Hong
H
Zhang
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China. lengliao@cqjtu.edu.cn.
Leng
L
Liao
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China. rqzhao@cqjtu.edu.cn.
Ruiqiang
R
Zhao
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China. jtzhou@cqjtu.edu.cn.
Jianting
J
Zhou
College of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China. yangmao199104@163.com.
Mao
M
Yang
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China. Runchuan727@163.com.
Runchuan
R
Xia
micro-magnetic sensor; non-destructive test; numerical simulation; self-magnetic flux leakage; steel corrosion