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Open AccessArticle

The Non-Destructive Test of Steel Corrosion in Reinforced Concrete Bridges Using a Micro-Magnetic Sensor

1
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2
School of Materials Science and Engineering, Chongqing Jiaotong University, Chongqing 400074, China
3
College of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China
*
Author to whom correspondence should be addressed.
Academic Editor: Kenneth J. Loh
Sensors 2016, 16(9), 1439; https://doi.org/10.3390/s16091439
Received: 28 July 2016 / Revised: 30 August 2016 / Accepted: 2 September 2016 / Published: 6 September 2016
(This article belongs to the Section Physical Sensors)
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. View Full-Text
Keywords: steel corrosion; non-destructive test; micro-magnetic sensor; self-magnetic flux leakage; numerical simulation steel corrosion; non-destructive test; micro-magnetic sensor; self-magnetic flux leakage; numerical simulation
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MDPI and ACS Style

Zhang, H.; Liao, L.; Zhao, R.; Zhou, J.; Yang, M.; Xia, R. The Non-Destructive Test of Steel Corrosion in Reinforced Concrete Bridges Using a Micro-Magnetic Sensor. Sensors 2016, 16, 1439.

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