Abstract: Immersion experiments of hardened LC3 paste particles, which prepared by limestone, calcined clay, and cement, were carried out in diffe-rent concentrations of NaCl, CaCl2 and MgCl2 solutions to investigate the changing law of the chloride ion concentration in the immersion solution, the physical composition, and the microstructure of the LC3 paste particles with the immersion time. The effect of different cations, such as Na+, Ca2+ and Mg2+ on the chloride binding capacity of LC3 paste were also analyzed. The results showed that the effect of the three cations on the chloride binding capacity of LC3 paste was Mg2+ ＞ Ca2+ ＞ Na+. Mg2+ and Ca2+ can promote the formation of Friedel's salt, which can improve the chemical binding capacity of chlorides in LC3 paste. Ca2+ can influence the content and structure of C-(A)-S-H gel to increase its physical adsorption capacity of chlorides. When the concentration of Mg2+ is higher, M-S-H gel can be formed to resulting in a decrease of the physical adsorption capacity of chlorides, but Na+ has no apparent influence on the physical adsorption capacity of chlorides.
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2025, Vol. 39 
