Hybrid optical-fibre/geopolymer sensors for structural health monitoring of concrete structures
Perry, M and Saafi, M and Fusiek, G and Niewczas, P (2015) Hybrid optical-fibre/geopolymer sensors for structural health monitoring of concrete structures. Smart Materials and Structures, 24 (4). 045011. ISSN 0964-1726 (https://doi.org/10.1088/0964-1726/24/4/045011)
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Abstract
In this work, we demonstrate hybrid optical-fibre/geopolymer sensors for monitoring temperature, uniaxial strain and biaxial strain in concrete structures. The hybrid sensors detect these measurands via changes in geopolymer electrical impedance, and via optical wavelength measurements of embedded fibre Bragg gratings. Electrical and optical measurements were both facilitated by metal-coated optical fibres, which provided the hybrid sensors with a single, shared physical path for both voltage and wavelength signals. The embedded fibre sensors revealed that geopolymer specimens undergo 2.7 mepsilon of shrinkage after one week of curing at 42 °C. After curing, an axial 2 mepsilon compression of the uniaxial hybrid sensor led to impedance and wavelength shifts of 7 × 10−2 and −2 × 10−4 respectively. The typical strain resolution in the uniaxial sensor was 100 $\mu \varepsilon $. The biaxial sensor was applied to the side of a concrete cylinder, which was then placed under 0.6 mepsilon of axial, compressive strain. Fractional shifts in impedance and wavelength, used to monitor axial and circumferential strain, were 3 × 10−2 and 4 × 10−5 respectively. The biaxial sensor's strain resolution was approximately 10 $\mu \varepsilon $ in both directions. Due to several design flaws, the uniaxial hybrid sensor was unable to accurately measure ambient temperature changes. The biaxial sensor, however, successfully monitored local temperature changes with 0.5 °C resolution.
ORCID iDs
Perry, M ORCID: https://orcid.org/0000-0001-9173-8198, Saafi, M, Fusiek, G ORCID: https://orcid.org/0000-0002-3361-7803 and Niewczas, P ORCID: https://orcid.org/0000-0003-3291-1725;-
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Item type: Article ID code: 53766 Dates: DateEvent24 February 2015Published26 January 2015AcceptedSubjects: Technology > Engineering (General). Civil engineering (General) Department: Faculty of Engineering > Civil and Environmental Engineering
Faculty of Engineering > Electronic and Electrical EngineeringDepositing user: Pure Administrator Date deposited: 15 Jul 2015 10:08 Last modified: 09 Oct 2024 00:23 URI: https://strathprints.strath.ac.uk/id/eprint/53766