Chloride-induced corrosion of reinforcement in simulated pore solution of geopolymer: Fid-Bau Portal

Chloride-induced corrosion of reinforcement in simulated pore solution of geopolymer

Fan, L.F. / Zhong, W.L. / Zhang, X.G.

Highlights • The effect of pore solution concentration on corrosion behavior was studied. • The localized corrosion of steel in geopolymer and cement was analyzed. • The chloride threshold value increases with higher alkaline of electrolyte. • The corrosion resistance of steel in geopolymer is higher than that in cement. • The passive film of steel in cement is more stable than that in geopolymer.

Abstract Studying the chloride-induced corrosion of reinforcement in geopolymer is of great significance to the corrosion prevention of marine engineering. In this paper, the chloride-induced corrosion experiments of reinforcement in five solutions with different compositions and concentrations were carried out. The chloride threshold value that lead to initiate depassivation of the reinforcement was proposed. The phenomena of localized corrosion and the corrosion current density were further analyzed. The results show that the chloride threshold value Ccrit increases with the increase of alkaline of electrolyte. Ca(OH)2 can maintain the alkalinity of pore solution. Thus the reinforcement immersed in Ca(OH)2 solution can be repassivated, which enhances the stability of the passivated film. The results further show that the reinforcement in geopolymer exhibited significantly higher corrosion resistance, however, the stability properties of the passivation film of reinforcement in cement is better than that of reinforcement in geopolymer.