Effect of Stray Current on Chloride Binding Mechanism in Concrete

In this article, simulation tests of chloride binding were made under the condition of sodium chloride as an internal admixture while loaded with stray current externally. Through the potential titration method, free chloride ion concentration C-f, total chloride ion concentration C-t and chloride binding rate R-Cl were determined. The results show that: With the increase of the strength and action time of the stray current, the number of internal free chloride ions in the cement paste increases while that of the corresponding bound chloride ions reduces significantly, leading to the decrease of chloride binding rate. The relationship between chloride binding rate and the two can be shown as follows respectively: R-Cl = 50.754e((-I/28.258)) + 42.532, R-Cl = 63.427e((-T/8.238)) + 27.325.