SIMULATION OF STEEL CORROSION IN CONCRETE BASED ON THE MODEL OF MACRO-CELL CORROSION CIRCUIT

Abstract

One comprehensive numerical simulation system is proposed for solving the problem of steel corrosion in concrete related to deterioration of reinforced concrete structures under the environment contaminated by chloride ions. Distribution of corrosion amount and corrosion rate along a reinforced bar is calculated based on macro-cell circuit model, which is constituted from micro-cell circuit model. Models are quantified by results of exposure experiments to two environments, one is cyclic wetting and drying in laboratory and the other is splash zone at offshore. The comparisons on time-dependent half-cell potential, corrosion location and corrosion amount indicate the quality coincidence between experimental and analytical results. Examples of calculation on macro-cell corrosion generated between patched area and non-patched area are shown.