Abstract
Abstract The chloride-induced corrosion of reinforcement in concrete is a serious problem. In this study, the chloride ion migration in cement materials blended with fly ash or/and slag is studied by the electrochemical impedance spectroscopy (EIS) method. A novel equivalent circuit model Rs(Q1(Rct1W1))(Q2(Rct2W2)) is established to analyze the chloride ion migration. The results indicate that increasing the amount of fly ash or/and slag enhances the resistance to chloride ion migration. The chloride ion migration depth can be qualified by an equation that is a function of the parameter (Rct1) of the circuit model. With this function, the chloride ion migration depth in cement materials replaced with fly ash or/and slag can be predicted by EIS method.
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