Mr. Jiang Geng Profile

Jiang Geng

at Nanjing Univ of Aeronautics and Astronautics

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Proceedings Article | 21 October 2009 Paper

Application of fiber Bragg grating sensor for rebar corrosion

Jiang Geng, Jin Wu, Xinming Zhao

Proceedings Volume 7493, 749333 (2009) https://doi.org/10.1117/12.840341

KEYWORDS: Sensors, Corrosion, Fiber Bragg gratings, Calibration, Coating, Civil engineering, Reliability, Fiber optics sensors, Sensing systems, Optical fibers

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Corrosion of rebar is one of the most important factors which can affect the durability of concrete structure, so in the service of these structures, measuring the degree of corrosion, and then evaluating the reliability of these structures are very important. The most significant characteristic of the rebar corrosion is its volume expansion. By the principle and characteristics of fiber bragg grating (FBG), a sensor for rebar corrosion is designed. In this paper, based upon laboratory studies, the fiber bragg grating sensor is applied in No.58 Berth of Lianyungang Port. According to the filed condition, a proper embedding scheme is proposed. Considering the optimal sensor placement, the monitoring points are determined and five sensor groups were applied in the structure. Based on the results of the calibration experiment, the relationship between corrosion ratio and the change of wavelength is established. So the corrosion status of the structure can be obtained by measuring wavelength. The study shows that the FBG sensor was feasible to monitor the status of rebar in concrete structures.

Proceedings Article | 21 October 2009 Paper

Simulation of fiber Bragg grating sensor for rebar corrosion

Jiang Geng, Jin Wu, Xinming Zhao

Proceedings Volume 7493, 74931I (2009) https://doi.org/10.1117/12.840342

KEYWORDS: Corrosion, Fiber Bragg gratings, Sensors, Cements, Civil engineering, Finite element methods, Optical simulations, Bridges, Buildings, Signal attenuation

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It is world widely concerned in the durability of reinforced concrete structures. Corrosion of rebar is one of the most important factors which can affect the durability of the concrete structures, and may result in damage to the structures in the form of expansion, cracking and eventually spalling of the cover concrete. In addition, the structural damage may be due to loss of bond between reinforcement and concrete and reduction of reinforcement cross-sectional area, and finally it may cause structure failure. With the advantages of linear reaction, small volume, high anti-erosion capability and automatic signal transmission, the smart sensors made of fiber bragg grating (FBG) to monitor strain, stress, temperature and local crack have got wide application in buildings, bridges and tunnels. FBG can be adhered to the surface of the structure, and also can be embedded into the inner of the structures when the project is being under construction to realize the real-time health monitoring. Based on volume expansion, the fiber bragg grating sensor for rebar corrosion is designed. The corrosion status of the structure can be obtained from the information provided by sensors. With the aid of the finite element software ANSYS, the simulation of the corrosion sensor was carried in this paper. The relationship between corrosion ratio and the shift of wavelength was established. According to the results of the simulation, there were differences between simulated results and measured results. The reason of the differences was also studied in this paper.

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