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Open AccessArticle

Distributed Optical Fiber Sensing Bonding Techniques Performance for Embedment inside Reinforced Concrete Structures

1
Department of Civil and Environmental Engineering, Technical University of Catalonia (UPC), c/Jordi Girona 1-3, 08034 Barcelona, Spain
2
Department of Reinforced Concrete Structures and Geotechnical Engineering (Vilnius Gediminas Technical University), Saulėtekio al. 11, 10221 Vilnius, Lithuania
3
Department of Architecture and Civil Engineering, Division of Structural Engineering (Chalmers University of Technology), Sven Hultins gata 6, 41258 Göteborg, Sweden
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(20), 5788; https://doi.org/10.3390/s20205788
Received: 7 September 2020 / Revised: 9 October 2020 / Accepted: 11 October 2020 / Published: 13 October 2020
(This article belongs to the Special Issue Structural Health Monitoring for Smart Structures)
Distributed optical fiber sensors (DOFS) are modern-day cutting-edge monitoring tools that are quickly acquiring relevance in structural health monitoring engineering. Their most ambitious use is embedded inside plain or reinforced concrete (RC) structures with the scope of comprehending their inner-workings and the functioning of the concrete-reinforcement interaction. Yet, multiple studies have shown that the bonding technique with which the DOFS are bonded to the reinforcement bars has a significant role on the quality of the extracted strain data. Whilst this influence has been studied for externally bonded DOFS, it has not been done for embedded ones. The present article is set on performing such study by monitoring the strain measurement quality as sampled by DOFS bonded to multiple rebars with different techniques and adhesives. These instrumented rebars are used to produce differently sized RC ties later tested in tension. The discussion of the test outputs highlights the quasi-optimal performance of a DOFS/rebar bonding technique consisting of incising a groove in the rebar, positioning the DOFS inside it, bonding it with cyanoacrylate and later adding a protective layer of silicone. The resulting data is mostly noise-free and anomalies-free, yet still presents a newly diagnosed hitch that needs addressing in future research. View Full-Text
Keywords: distributed sensing; optical fibers; reinforced concrete; steel strains; structural health monitoring distributed sensing; optical fibers; reinforced concrete; steel strains; structural health monitoring
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MDPI and ACS Style

Bado, M.F.; Casas, J.R.; Dey, A.; Berrocal, C.G. Distributed Optical Fiber Sensing Bonding Techniques Performance for Embedment inside Reinforced Concrete Structures. Sensors 2020, 20, 5788. https://doi.org/10.3390/s20205788

AMA Style

Bado MF, Casas JR, Dey A, Berrocal CG. Distributed Optical Fiber Sensing Bonding Techniques Performance for Embedment inside Reinforced Concrete Structures. Sensors. 2020; 20(20):5788. https://doi.org/10.3390/s20205788

Chicago/Turabian Style

Bado, Mattia F.; Casas, Joan R.; Dey, Alinda; Berrocal, Carlos G. 2020. "Distributed Optical Fiber Sensing Bonding Techniques Performance for Embedment inside Reinforced Concrete Structures" Sensors 20, no. 20: 5788. https://doi.org/10.3390/s20205788

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