抄録
The chloride binding behaviors of monosulfate hydrate (AFm) and C-S-H are investigated. The chloride binding curve of AFm can be represented by a Freundlich isotherm. The chloride binding of AFm mainly depends on the formation of Friedel′s salt by ion exchange between SO42- and Cl-. Theoretically, 1 mol of Friedel′s salt contains 2 mol of chloride ion. In this study, 1 mol of AFm bound 1.1 mol of chloride ion at a chloride concentration of 5mol/l. This is considered to be caused by the partial dissolution of AFm and the production of other hydrates such as ettringite. The chloride binding curve of C-S-H can be represented by a Langmuir isotherm. C-S-H binds chloride ion mainly by sorption. In this study, 1 g of C-S-H bound 0.4 mol of chloride ion at a chloride concentration of 3.5mol/l.
