The electrochemical study of realkalisated reinforced concrete (cement mortar) after re-carbonation

Abstract:

A re-carbonation test of Realkalisated reinforced concrete (cement mortar) was carried out. The re-carbonation time was the same as the first carbonation time before realkalisation. The surface state of steel and the alkaline of the cement mortar was studied with electrochemical impedance spectroscopy (EIS), polarization curve and the measurement of pH. The test results show that under the experimental conditions, the pH of cement mortar is above 10 after re-carbonation; after re-carbonation, the corrosion current density of steel increases and is less than before realkalisation; the corrosion potential of steel decreases, but is more than before realkalisation.