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Proceedings Paper

Monitoring the corrosion of steel in reinforced concrete using optical waveguide methods
Author(s): X. M. Li; Weimin Chen; Yong Zhu; Shanglian Huang; Kim D. Bennett
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Paper 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.

Paper Details

Date Published: 12 June 2000
PDF: 8 pages
Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); doi: 10.1117/12.388104
Show Author Affiliations
X. M. Li, Chongqing Univ. (China)
Weimin Chen, Chongqing Univ. (China)
Yong Zhu, Chongqing Univ. (China)
Shanglian Huang, Chongqing Univ. (China)
Kim D. Bennett, Lafayette College (United States)


Published in SPIE Proceedings Vol. 3986:
Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Richard O. Claus; William B. Spillman Jr., Editor(s)

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