Abstract In this study, the effect of Mg2+ on early hydration of Portland cement is addressed. Heat flow calorimetry and ICP-OES are employed to characterize the cement hydration at early age. XRD, TG-DSC are utilized to demonstrate the changes of phase composition during early age. SEM-EDS and 27Al MAS NMR are used to reveal phase transformation of aluminum related hydration products. The results show that the induction period of cement is prolonged after Mg2+ incorporation, resulting in decreased dissolution of clinker minerals. The effect of Mg2+ on acceleration period depends on its concentration. Mg2+ hinders the formation of Ca(OH)2 and transformation from AFt to AFm and TAH.

中文翻译：

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Mg2+ 在海水混合硅酸盐水泥系统中的作用的表征和建模

摘要 本研究讨论了Mg2+对硅酸盐水泥早期水化的影响。热流量热法和 ICP-OES 用于表征早期水泥水化。XRD、TG-DSC 被用来证明早期阶段的相组成变化。SEM-EDS 和 27Al MAS NMR 用于揭示铝相关水合产物的相变。结果表明，掺入Mg2+后水泥的诱导期延长，导致熟料矿物的溶解减少。Mg2+ 对加速时间的影响取决于其浓度。Mg2+ 阻碍 Ca(OH)2 的形成和从 AFt 到 AFm 和 TAH 的转变。