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

Bremer, Kort; Alwis, Lourdes; Zheng, Yulong; Weigand, Frank; Kuhne, Michael; Helbig, Reinhard; Roth, Bernhard

Abstract

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.

Citation

Bremer, K., Alwis, L., Zheng, Y., Weigand, F., Kuhne, M., Helbig, R., & Roth, B. (2019). Durability of functionalized carbon structures with optical fiber sensors in a highly alkaline concrete environment. Applied Sciences, 9(12), https://doi.org/10.3390/app9122476

• Journal Article Type: Article
• Acceptance Date: Jun 12, 2019
• Online Publication Date: Jun 18, 2019
• Publication Date: Jun 18, 2019
• Deposit Date: Jun 20, 2019
• Publicly Available Date: Jun 20, 2019
• Journal: Applied Sciences
• Electronic ISSN: 2076-3417
• Publisher: MDPI
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 12
• DOI: https://doi.org/10.3390/app9122476
• Keywords: structural health monitoring (SHM); functionalized carbon structure (FCS); carbon reinforced concrete (CRC); fiber optic sensor (FOS); optical glass fiber
• Public URL: http://researchrepository.napier.ac.uk/Output/1890998
• Publisher URL: https://www.mdpi.com/2076-3417/9/12/2476/htm