The interaction of magnesium and calcium silicate hydrate (C-S-H) is of importance in the realm of cement chemistry given the need for sustainable binders and durability concerns. In this paper, comprehensive analyses were conducted to reveal the effects of magnesium on the physiochemical properties of C-S-H. Three factors including anion types, concentrations of magnesium solution as well as the Ca/Si ratio of the starting C-S-H samples were considered. It is demonstrated that the stability of C-S-H is impaired under magnesium attack. Magnesium silicate hydrate (M-S-H) and/or brucite are prone to precipitate on the surface of C-S-H samples after being attacked by 0.05 mol/L magnesium, which accounts for the high amount of magnesium measured by EDS. In contrast, at a magnesium concentration of 0.5 mol/L, M-S-H with a trace amount of calcium becomes the dominating phase. The Ca/Si and Mg/Si ratios of hydrates show an increase with the Ca/Si ratio of starting C-S-H samples. The XPS results indicate that a small amount of magnesium may enter into the C-S-H structure after exposure to 0.05 mol/L magnesium solution, presenting a different Mg 1s binding energy compared with pure M-S-H. Anion types do not exhibit a pronounced influence on the deterioration of C-S-H, except gypsum is observed in the hydrates when sulfate ions are present.

鉴于需要可持续的粘合剂和耐久性问题，镁和水合硅酸钙 (CSH) 的相互作用在水泥化学领域非常重要。本文通过综合分析揭示镁对CSH理化性质的影响。考虑了三个因素，包括阴离子类型、镁溶液浓度以及起始 CSH 样品的 Ca/Si 比。表明在镁攻击下 CSH 的稳定性受损。水合硅酸镁 (MSH) 和/或水镁石在受到 0.05 mol/L 镁的侵蚀后容易在 CSH 样品表面析出，这是 EDS 测得的高镁含量的原因。相反，在镁浓度为 0.5 mol/L 时，含有微量钙的 MSH 成为主导相。水合物的 Ca/Si 和 Mg/Si 比随着起始 CSH 样品的 Ca/Si 比而增加。XPS结果表明，在0.05 mol/L镁溶液中，少量镁可能进入CSH结构，与纯MSH相比，Mg 1s结合能不同。阴离子类型对 CSH 的恶化没有显着影响，除了当存在硫酸根离子时在水合物中观察到石膏。与纯 MSH 相比，呈现不同的 Mg 1s 结合能。阴离子类型对 CSH 的恶化没有显着影响，除了当存在硫酸根离子时在水合物中观察到石膏。与纯 MSH 相比，呈现不同的 Mg 1s 结合能。阴离子类型对 CSH 的恶化没有显着影响，除了当存在硫酸根离子时在水合物中观察到石膏。