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Sensors 2018, 18(8), 2635; https://doi.org/10.3390/s18082635

Experimental Study on Residual Bending Strength of Corroded Reinforced Concrete Beam Based on Micromagnetic Sensor

1
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
2
Yunnan Wuyi Expressway Construction Command, Kunming 650000, China
3
Chongqing Yapai Bridge Engineering Quality Inspection Co., Ltd., Chongqing 401120, China
*
Author to whom correspondence should be addressed.
Received: 3 July 2018 / Revised: 8 August 2018 / Accepted: 9 August 2018 / Published: 11 August 2018
(This article belongs to the Special Issue Magnetic Sensors)
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Abstract

This paper presents a nondestructive test method to evaluate the residual bending strength of corroded reinforced concrete beam by analyzing the self-magnetic flux leakage (SMFL) signals. The automatic scanning device was equipped with a micromagnetic sensor and sensor-based experimental details were introduced. Next, the theoretical formula of the normal component HS(z) of the SMFL signal that originated from the corroded region was derived based on the magnetic dipole model and the experimental results were discussed. The results indicate that the experimental data of HS(z) are consistent with the theoretical calculations, both location and extent of the steel bars corrosion can be qualitatively determined by using HS(z). The gradient K of HS(z) is approximately linearly related to the loss rate, S, of the bending strength, which can be used to evaluate the residual bending strength of the corroded reinforced concrete beam. This work lays the foundation for evaluating the residual bending strength of corroded reinforced concrete beams using the SMFL signal; the micromagnetic sensor is further applied to the civil engineering. View Full-Text
Keywords: corroded reinforced concrete beam; bending strength; micromagnetic sensor; self-magnetic flux leakage; magnetic dipole model corroded reinforced concrete beam; bending strength; micromagnetic sensor; self-magnetic flux leakage; magnetic dipole model
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zhou, J.; Qiu, J.; Zhou, Y.; Zhou, Y.; Xia, R. Experimental Study on Residual Bending Strength of Corroded Reinforced Concrete Beam Based on Micromagnetic Sensor. Sensors 2018, 18, 2635.

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