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BEM analysis on half-cell potential measurement for corrosion estimation
Corrosion of reinforcement in reinforced concrete occurs due to an electro-chemical reaction. Accordingly, half-cell potential measurement is employed to estimate corrosion of reinforcing steel-bars (rebars). Applying the three-dimensional boundary element method (3D-BEM), potential distribution and current flow from the anodic region to the cathodic region on rebars are analyzed. The analysis simulates the half-cell potential measurement by a double-electrode probe. Results obtained are concluded as follows: By BEM analysis, it is found that only the macro-cell is found in the intact model, while both the macro-cell and the micro-cell mechanisms are observed in the void model. The analysis of current flows elucidates the micro-cell mechanism around the voids. The presence of the void causes the micro-cell current around the void position in which the rebar areas around the void become the anode and the rebar areas under the void become the cathode in the micro-cell circuit. This implies that rebars around the void could corrode faster than those under the void. The results of half-cell potential measurement show the higher negative values than the actual potentials, especially in void specimen. It is found that BEM analysis of potential distributions and current flows identify the corroded areas.
BEM analysis on half-cell potential measurement for corrosion estimation
Corrosion of reinforcement in reinforced concrete occurs due to an electro-chemical reaction. Accordingly, half-cell potential measurement is employed to estimate corrosion of reinforcing steel-bars (rebars). Applying the three-dimensional boundary element method (3D-BEM), potential distribution and current flow from the anodic region to the cathodic region on rebars are analyzed. The analysis simulates the half-cell potential measurement by a double-electrode probe. Results obtained are concluded as follows: By BEM analysis, it is found that only the macro-cell is found in the intact model, while both the macro-cell and the micro-cell mechanisms are observed in the void model. The analysis of current flows elucidates the micro-cell mechanism around the voids. The presence of the void causes the micro-cell current around the void position in which the rebar areas around the void become the anode and the rebar areas under the void become the cathode in the micro-cell circuit. This implies that rebars around the void could corrode faster than those under the void. The results of half-cell potential measurement show the higher negative values than the actual potentials, especially in void specimen. It is found that BEM analysis of potential distributions and current flows identify the corroded areas.
BEM analysis on half-cell potential measurement for corrosion estimation
Analyse der Halbzellen-Potenzialmessung zur Korrosionsabschätzung mittels Rand-Element-Methode
Leelalerkiet, V. (author) / Kyung, J.W. (author) / Yokota, M. (author) / Ohtsu, M. (author)
2003
8 Seiten, 14 Bilder, 2 Tabellen, 5 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
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