51312-01299-An Innovative Distributed Node Electrode System for Corrosion Monitoring of Concrete Rebars

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Product Number: 51312-01299-SG

ISBN: 01299 2012 CP

Author: Kuang-Tsan Kenneth Chiang

Publication Date: 2012

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Corrosion is often the major cause of concrete structure failures. The corrosion rate of the reinforcement bars (rebars) is one of the most important parameters in assessing the failure risk and remaining life of a concrete structure. An innovative node electrode system was developed to provide corrosion monitoring in concrete structures. A concrete rebar or a long metal rebar with a composition similar to concrete rebars was used the working electrode. The long metal bar is coated such that only selected sections (evenly distributed along the axial direction) are exposed to the concrete. Each of the exposed sections has a well-defined surface area for corrosion rate measurement using conventional electrochemical techniques such as the linear polarization resistance method. The collection of the exposed sections form a network of electrodes and each exposed section is a node electrode. The system allows real-time detection of corrosion using relatively few instruments and electrical cables. The node electrode allows accurate measurement of the corrosion rate at locations identified to be high risk by the real-time detection system. The experimental results obtained to determine the effects of the node electrode size distance between the neighboring nodes and corrosivity of the environment will be discussed.