Abstract The hydration of reactive periclase (MgO) in the presence of hydromagnesite (Mg5(CO3)4(OH)2·4H2O) was investigated by a variety of physical and chemical techniques. Hydration of pure MgO-water mixtures gave very weak pastes of brucite (Mg(OH)2), but hydration of MgO-hydromagnesite blends gave pastes which set quickly and gave compressive strengths of potential interest for construction applications. The strengths of the blends increased with hydration time at least up to 28 days, and were not significantly decreased by increasing the hydromagnesite content up to 30%. Raman spectroscopy suggests that an amorphous phase, of composition between that of brucite, hydromagnesite and water, may form. Small amounts of calcite also form due to CaO in the MgO source. Thermodynamic calculations imply that the crystalline phase artinite (MgCO3·Mg(OH)2·3H2O) should be the stable product in this system, but it is not observed by either XRD or FTIR techniques, which suggests that its growth may be kinetically hindered.

中文翻译：

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MgO-水菱镁矿共混物的水化机理

摘要 通过各种物理和化学技术研究了在水菱镁矿 (Mg5(CO3)4(OH)2·4H2O) 存在下反应性方镁石 (MgO) 的水合反应。纯 MgO-水混合物的水合作用产生非常弱的水镁石 (Mg(OH)2) 糊状物，但 MgO-水菱镁矿混合物的水合作用产生的糊状物快速凝固并提供潜在的用于建筑应用的抗压强度。共混物的强度随水合时间增加至少长达 28 天，并且不会因水菱镁矿含量增加至 30% 而显着降低。拉曼光谱表明可能形成无定形相，其组成介于水镁石、水菱镁矿和水之间。由于 MgO 源中的 CaO，也会形成少量方解石。