Quantitative Study on MCI Rehabilitating Steel Bars in Chloride-Contaminated Concrete Based on Inhibition and Transport Behaviors

Abstract

AbstractThe transport and inhibition behaviors of a migrating corrosion inhibitor (MCI, marked PCI-2015) in reinforced concrete (in this paper, only mortar specimens were used for testing) contained different contents of NaCl (0.25, 0.5, 0.75, and 1% by weight of cement) with three water-cement ratios (0.45, 0.55, and 0.65) were investigated by using absorption tests and electrochemical measurements. The results indicated that the measured absorption weight of PCI-2015 basically agrees with the numerical value calculated by the modified MCI transport model, and the representative absorbed weight of PCI-2015 in W/C 0.65 concrete with 1% NaCl was 16.23 g/kg at 1 day, while the corrosion current (Icorr) of steel bars in the concrete was reduced to 0.02 μA/cm2 from the initial data 1.38 μA/cm2. The visual observation of surface condition for steel bars in concrete mixed with 1% NaCl by broken specimens showed that the surfaces of steel bars in concrete treated with PCI-2015 were bright. X-ray photoelectron...