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Sensors 2016, 16(7), 1093; doi:10.3390/s16071093

A Monitoring Method Based on FBG for Concrete Corrosion Cracking

1
Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, China
2
College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China
*
Author to whom correspondence should be addressed.
Academic Editor: Gangbing Song
Received: 11 February 2016 / Revised: 8 June 2016 / Accepted: 1 July 2016 / Published: 14 July 2016
(This article belongs to the Section Physical Sensors)
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Abstract

Corrosion cracking of reinforced concrete caused by chloride salt is one of the main determinants of structure durability. Monitoring the entire process of concrete corrosion cracking is critical for assessing the remaining life of the structure and determining if maintenance is needed. Fiber Bragg Grating (FBG) sensing technology is extensively developed in photoelectric monitoring technology and has been used on many projects. FBG can detect the quasi-distribution of strain and temperature under corrosive environments, and thus it is suitable for monitoring reinforced concrete cracking. According to the mechanical principle that corrosion expansion is responsible for the reinforced concrete cracking, a package design of reinforced concrete cracking sensors based on FBG was proposed and investigated in this study. The corresponding relationship between the grating wavelength and strain was calibrated by an equal strength beam test. The effectiveness of the proposed method was verified by an electrically accelerated corrosion experiment. The fiber grating sensing technology was able to track the corrosion expansion and corrosion cracking in real time and provided data to inform decision-making for the maintenance and management of the engineering structure. View Full-Text
Keywords: Fiber Bragg Grating; reinforced concrete; structural health monitoring; reinforcement corrosion; corrosion cracking Fiber Bragg Grating; reinforced concrete; structural health monitoring; reinforcement corrosion; corrosion cracking
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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MDPI and ACS Style

Mao, J.; Xu, F.; Gao, Q.; Liu, S.; Jin, W.; Xu, Y. A Monitoring Method Based on FBG for Concrete Corrosion Cracking. Sensors 2016, 16, 1093.

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