Abstract
Stray current can not only corrode steel bars but also cause the movement and accumulation of ions inside concrete. To investigate the distribution law and change mechanism of ions under the effect of stray current, a stray current corrosion experiment lasting 120 hours is carried out on a reinforced concrete beam. The pH value and concentrations of sodium, calcium and chloride ions of solution in the beam are measured at intervals. And the ion concentration distribution is simulated using DuCOM numerical platform. Results show that the ion concentration distribution is basically stable after three days of electrification. The alkalinity at the negative electrode increases, and the acidity at the positive electrode increases significantly. Sodium ion. The daughter and calcium ions gather at the negative electrode under the action of stray current and are far away from the positive electrode. The chloride ion concentration is at the positive electrode. Increase, decrease at the negative pole. The simulation by DuCOM can well reflect the directional movement trend of ions under the action of external current, with prediction error lower than 15%.
Published Version
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