Durability of functionalized carbon structures with optical fiber sensors in a highly alkaline concrete environment

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Bremer, K.; Alwis, L.S.M.; Zheng, Y.; Weigand, F.; Kuhne, M. et al.: Durability of functionalized carbon structures with optical fiber sensors in a highly alkaline concrete environment. In: Applied Sciences 9 (2019), Nr. 12, 476. DOI: https://doi.org/10.3390/app9122476

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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.
License of this version: CC BY 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Forschungszentren

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