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A platform for research: civil engineering, architecture and urbanism
Factors influencing chloride-induced corrosion of reinforcement in concrete
Abstract The paper presents the results of a corrosion investigation on rebar electrodes embedded in concrete prism specimens which were exposed to cycles of sea-water spray for up to about 600 days (1200 marine cycles). The w/c ratio of the matrix was varied between 0.45 and 0.76 and the cement content ranged between 330 and 530 kg $ m^{−3} $. Corrosion potential and polarization resistance of the electrodes were monitored at regular intervals by means of electrochemical procedures using a potentiostat apparatus. The $ Cl^{−} $ and $ OH^{−} $ concentrations in the matrix were also determined at the level of rebar electrodes. The results show that cement content has an insignificant influence on rebar corrosion, w/c ratio being the dominant factor which controls corrosion. The $ Cl^{−} $ and $ OH^{−} $ concentrations of the pore fluid are of secondary importance relative to w/c ratio. Acceptable corrosion rates are achieved at a w/c of 0.45, with the pore fluid $ Cl^{−} $/$ OH^{−} $ ratio reaching a value of 11.
Factors influencing chloride-induced corrosion of reinforcement in concrete
Abstract The paper presents the results of a corrosion investigation on rebar electrodes embedded in concrete prism specimens which were exposed to cycles of sea-water spray for up to about 600 days (1200 marine cycles). The w/c ratio of the matrix was varied between 0.45 and 0.76 and the cement content ranged between 330 and 530 kg $ m^{−3} $. Corrosion potential and polarization resistance of the electrodes were monitored at regular intervals by means of electrochemical procedures using a potentiostat apparatus. The $ Cl^{−} $ and $ OH^{−} $ concentrations in the matrix were also determined at the level of rebar electrodes. The results show that cement content has an insignificant influence on rebar corrosion, w/c ratio being the dominant factor which controls corrosion. The $ Cl^{−} $ and $ OH^{−} $ concentrations of the pore fluid are of secondary importance relative to w/c ratio. Acceptable corrosion rates are achieved at a w/c of 0.45, with the pore fluid $ Cl^{−} $/$ OH^{−} $ ratio reaching a value of 11.
Factors influencing chloride-induced corrosion of reinforcement in concrete
Mangat, P. S. (author) / Molloy, B. T. (author)
1992
Article (Journal)
English
Factors influencing chloride-induced corrosion of reinforcement in concrete
| Springer Verlag | 1992
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