Performance of Chloride Binding by Aluminate Hydrates in Cement-Based Composite Materials
The chloride binding capacity of aluminate hydrates in cement-based composite materials is investigated. The total chloride contents and free chloride contents were analyzed by acid-soluble method and water-soluble method. The chemical interaction of chloride with the hydrates of aluminate phases in cement was also studied by X-ray diffraction. Test results show that the monosulfate hydrate has chloride binding capacities, whereas ettringite has no capacity to bind chloride. The chloride binding by monosulfate hydrate is attributed to the formation of Friedel’s salt and Kuzel’s salt by the ion exchange of SO42- with Cl- and the nonlinear relationship can be represented best by a Freundlich isotherm.
B. Xu and H.Y. Li
M. F. Gou and X. M. Guan, "Performance of Chloride Binding by Aluminate Hydrates in Cement-Based Composite Materials", Advanced Materials Research, Vol. 583, pp. 211-214, 2012