Monitoring the corrosion of steel in reinforced concrete using optical waveguide methods

X. M. Li; Weimin Chen; Yong Zhu; Shanglian Huang; Kim D. Bennett

doi:10.1117/12.388104

12 June 2000 Monitoring the corrosion of steel in reinforced concrete using optical waveguide methods

X. M. Li, Weimin Chen, Yong Zhu, Shanglian Huang, Kim D. Bennett

Proceedings Volume 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (2000) https://doi.org/10.1117/12.388104
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

An optical waveguide sensing method is proposed for monitoring the corrosion of steel in reinforced concrete structures. The method depends on the absorption of light in the waveguide by a metallic cladding which is applied at a particular location. When this cladding is exposed to a corrosive environment, it degrades, and the optical waveguide output increases. This sensing principle is analyzed, as is an electrochemical method proposed to lay the metal film onto the waveguide. In order to establish a reliable procedure for electroplating an Fe-C alloy film onto fused silica, we first investigated the use of a planar waveguide substrate, and electroless plating of silver onto SiO₂ was introduced as the electroplating cathode. After analysis, an optical fiber version of the corrosion sensor was then fabricated using the electrochemical method. The sensor was intensively corroded with HNO₃, NSS, and simulated concrete pore solutions. The experimental results are presented and to some degree coincide with theory.

Citation Download Citation

X. M. Li, Weimin Chen, Yong Zhu, Shanglian Huang, and Kim D. Bennett "Monitoring the corrosion of steel in reinforced concrete using optical waveguide methods", Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); https://doi.org/10.1117/12.388104

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