Abstract This study proposed the use of hydration agent (HA) and seeds to improve the hydration and carbonation of reactive magnesium cement (RMC)-based concrete formulations. Hydration of RMC was evaluated by isothermal calorimetry. Water absorption and compressive strength results were used to assess the mechanical performance of RMC-based concrete samples. Quantification of hydrate and carbonate phases was performed via XRD and TGA. Formation and morphology of carbonates were observed via BSE and SEM. In addition to increasing the utilization of RMC in the carbonation reaction and facilitating early strength development, the use of HA formed large carbonate phases, while the addition of seeds improved sample microstructures via the development of dense carbonate networks. The improvements in morphology, microstructure and carbonate content in samples involving the simultaneous use of HA and seeds resulted in 56% lower water absorption values and 46% higher 28-day compressive strengths (70 MPa) in comparison to the control sample.

中文翻译：

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开发具有增强水化和碳化机制的 MgO 混凝土

摘要 本研究提出使用水化剂 (HA) 和种子来改善基于活性镁水泥 (RMC) 的混凝土配方的水化和碳化。通过等温量热法评估 RMC 的水合。吸水率和抗压强度结果用于评估基于 RMC 的混凝土样品的机械性能。水合物和碳酸盐相的定量通过 XRD 和 TGA 进行。通过BSE和SEM观察碳酸盐的形成和形态。除了在碳酸化反应中增加 RMC 的利用率和促进早期强度发展外，HA 的使用形成了大的碳酸盐相，而种子的添加通过形成致密的碳酸盐网络改善了样品的微观结构。形态学上的改进，