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Open AccessArticle

Durability of Functionalized Carbon Structures with Optical Fiber Sensors in a Highly Alkaline Concrete Environment

1
Hannover Centre for Optical Technologies (HOT), Leibniz University Hannover, 30167 Hannover, Germany
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School of Engineering and the Built Environment, Edinburgh Napier University, Edinburgh EH10 5DT, UK
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Saxon Textile Research Institute (STFI), 09125 Chemnitz, Germany
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Materialforschungs-und-Prüfanstalt an der Bauhaus-Universität Weimar (MFPA), 99423 Weimar, Germany
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Cluster of Excellence PhoenixD, Leibniz University Hannover, Welfengarten 1, 30167 Hannover, Germany
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(12), 2476; https://doi.org/10.3390/app9122476
Received: 4 May 2019 / Revised: 28 May 2019 / Accepted: 12 June 2019 / Published: 18 June 2019
The paper presents an investigation into the durability of functionalized carbon structures (FCS) in a highly alkaline concrete environment. First, the suitability of optical fibers with different coatings—i.e., acrylate, polyimide, or carbon—for the FCS was investigated by subjecting fibers with different coatings to micro/macro bending and a 5% sodium hydroxide (NaOH) (pH 14) solution. Then, the complete FCS was also subjected to a 5% NaOH solution. Finally, the effects of spatial variation of the fiber embedded in the FCS and the bonding strength between the fiber and FCS was evaluated using different configurations —i.e., fiber integrated into FCS in a straight line and/or with offsets. All three coatings passed the micro/macro bending tests and show degradation after alkaline exposure, with the carbon coating showing least degradation. The FCS showed relative stability after exposure to 5% NaOH. The optimum bonding length between the optical fiber and the carbon filament was found to be ≥150 mm for adequate sensitivity. View Full-Text
Keywords: structural health monitoring (SHM); functionalized carbon structure (FCS); carbon reinforced concrete (CRC); fiber optic sensor (FOS); optical glass fiber structural health monitoring (SHM); functionalized carbon structure (FCS); carbon reinforced concrete (CRC); fiber optic sensor (FOS); optical glass fiber
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Bremer, K.; Alwis, L.S.M.; Zheng, Y.; Weigand, F.; Kuhne, M.; Helbig, R.; Roth, B. Durability of Functionalized Carbon Structures with Optical Fiber Sensors in a Highly Alkaline Concrete Environment. Appl. Sci. 2019, 9, 2476.

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