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Title |
Chloride Adsorption of Cement Hydrates by Time Step Based on Theoretical Combination of Cement Hydration and Pore Chemistry
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DOI |
https://doi.org/10.4334/JKCI.2024.36.6.637 |
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Keywords |
염소흡착; 공극수 pH; 화학적 발현; 시멘트 수화 chloride adsorption; pH development; pore chemistry; cement hydration |
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Abstract |
Chloride ion adsorption experiments were performed according to the chemical development characteristics of cement pore water at each time step. The adsorption amount of the major hydrates for chloride ion adsorption decreased as the pH of the pore water increased. The stability of Friedel’s salt, formed by the reaction of the AFm phase with chloride ions, decreased as the pH increased. Specifically, the decrease in the adsorption capacity of the C-S-H phase with increasing pH was more pronounced as the Ca/Si ratio increased. Based on the experimental results, a correlation between the chloride adsorption density of cement hydrates, the pH of the pore water, and the amount of chloride ions infiltrated was proposed using a multiple regression analysis equation. The experimental results were combined with a model according to the chemical development of cement pore water to estimate the chloride ion adsorption density of the major cement hydrates at each time step.
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