Hydrated magnesium silicate materials are promising binding materials for applications as alternative cementitious materials and may offer a lower carbon footprint than conventional binders if carbon-free feedstocks are used. The reaction of reactive MgO with silica sources yields magnesium silicate hydrate (M-S-H) phases. These M-S-H phases have layered silicate structure and are stable from pH 8 to 12; thus, M-S-H phases are of interest for applications requiring low-pH binders, such as radioactive waste management and encapsulation. Reactive Mg-cements have been extensively studied in the past 100 years, yet the literature does not offer a dedicated review of M-S-H materials. This review provides a critical analysis of the current knowledge on M-S-H-based binders, discussing the main variables involved in M-S-H synthesis, the structure and characterization of these phases, thermodynamic parameters, stability, as well as the mechanical properties and potential applications of the resulting binders.

中文翻译：

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对粘合剂应用中硅酸镁水合物 (MSH) 相的严格审查

水合硅酸镁材料是作为替代胶凝材料应用的有前途的粘结材料，并且如果使用无碳原料，则可以提供比传统粘结剂更低的碳足迹。反应性 MgO 与二氧化硅源反应生成水合硅酸镁 (MSH) 相。这些 MSH 相具有层状硅酸盐结构，在 pH 8 至 12 范围内保持稳定；因此，MSH 相对于需要低 pH 粘合剂的应用很有意义，例如放射性废物管理和封装。过去 100 年来，活性镁水泥得到了广泛的研究，但文献并未对 MSH 材料进行专门的综述。本综述对 MSH 基粘合剂的现有知识进行了批判性分析，讨论了 MSH 合成中涉及的主要变量、这些相的结构和表征、热力学参数、稳定性以及所得产物的机械性能和潜在应用。粘合剂。