Abstract
Rebar corrosion significantly reduces the lifespan of reinforced concrete structures. The value of rebar strain, especially for some key structural components, indicates the safety margin of structures. In this study, a graphene oxide (GO) coated no-core fiber-fiber Bragg grating (NCF-FBG) fiber optic sensor is proposed for simultaneously measuring strain values and early-stage corrosion of steel rebar for the first time. The impact of GO coating thickness on the monitoring sensitivity is considered. A setup was manufactured to simultaneously perform tension, optical, and corrosion tests. The strain was applied up to 1200 μϵ. The rebar corrosion was assessed using electrochemical method by submerging them in a 3.5 wt.% NaCl solution. Results show that the dip wavelength of the proposed fiber sensor increases with longer corrosion time, while it decreases with higher strain values. In contrast, the Bragg wavelength decreases with increasing rebar strain, whereas it remains unchanged during the corrosion of the rebar. GO coating enhances the sensitivity of corrosion monitoring, and the sensitivity increases with an increase in the thickness. The sensitivity matrix of NCF-FBG optical sensors was obtained experimentally. This matrix can be used to simultaneously monitor both the strain level and early-stage corrosion of steel rebars.
Recommended Citation
F. Tang et al., "Simultaneous Measurement Of Early-stage Corrosion And Strain Levels In Steel Rebar Based On Graphene Oxide-coated NCF-FBG Fiber Optic Sensor," IEEE Transactions on Instrumentation and Measurement, Institute of Electrical and Electronics Engineers, Jan 2025.
The definitive version is available at https://doi.org/10.1109/TIM.2025.3551462
Department(s)
Electrical and Computer Engineering
Keywords and Phrases
adhesion; fiber Bragg grating; GO coating; No-core fiber; steel rebar corrosion
International Standard Serial Number (ISSN)
1557-9662; 0018-9456
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2025 Institute of Electrical and Electronics Engineers, All rights reserved.
Publication Date
01 Jan 2025
