Effect of Barium Ion on Chloride Binding of Monosulfoaluminate
LI Aosen1, CONG Yun2, ZHANG Yan3,*, LIU Jialong3, HAN Zhiwei3
1 State Grid Corporation of China, Beijing 100031, China 2 Zhoushan Power Supply Company of State Grid Zhejiang Electric Power Company, Zhoushan 316021, Zhejiang, China 3 China Electric Power Research Institute, Beijing 100192, China
Abstract: As one of the primary hydrated products of cement, monosulfoaluminate (AFm) could realize chloride binding via exchanging ions between interlayer sulfate ions and chloride ions, which played a crucial role in enhancing the chloride binding capacity of cementitious materials and reducing the corrosion risk of reinforcing concrete. To enhance the chloride binding capacity of AFm, barium ion with different concentrations was introduced into chloride salt solutions immersing AFm, the chloride binding capacity of AFm sample at each age was compared. The phase compositions, thermal properties and microscopic morphology of AFm sample at each age were analyzed, and the change rule of barium ion concentration in the solution at each age was analyzed. The effect of barium ion with different concentrations on chloride binding of AFm was discussed, and the mechanisms behind were investigated. The results indicate that barium ion can consume sulfate ions of AFm to promote the ion exchange reaction between AFm and chloride ions and enhance the chloride binding capacity of AFm. But the mechanism of AFm on chloride binding is different with different concentrations of barium ions. Barium ion with low concentration promotes the formation of AFt and Friedel's salt, while ba-rium ion with high concentration generates more Kuzel's salt.
李奥森, 丛贇, 张琰, 刘佳龙, 韩志伟. 钡离子对单硫型水化硫铝酸钙氯离子固化作用的影响[J]. 材料导报, 2023, 37(21): 22050307-6.
LI Aosen, CONG Yun, ZHANG Yan, LIU Jialong, HAN Zhiwei. Effect of Barium Ion on Chloride Binding of Monosulfoaluminate. Materials Reports, 2023, 37(21): 22050307-6.
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2023, Vol. 37 
