C-S-H phase is one of the main hydrates in hardened cement paste and binds chloride ions. The purpose of this study is to quantify equilibrium amount of chloride adsorption bound by C-S-H phase with various Ca/Si ratios. C-S-H phase can absorb chloride ions with 3 steps. In the C-S-H phase with low Ca/Si ratios, momentary physical adsorption could not be expected. Physical adsorption is strongly dependent on electro-kinetic interaction between surface area of C-S-H phase and chloride ions. In previous research, C-S-H phase showed binding behavior with 3 stages including the stage of instantaneous physical adsorption other stages. Thus, this study examined the equilibrium amount to express chloride binding isotherm of C-S-H with various Ca/Si ratio.

• 윤인석(인덕대학교 건설정보공학과) | Yoon, In-Seok