This study focuses on the development of carbonated reactive magnesia cement (RMC) concrete formulations involving hydromagnesite (H), magnesite (M) and hydration agent (HA). Partial replacement of RMC by H and M stimulated the formation of hydrate and carbonate phases. Use of H increased the rate and degree of hydration, resulting in the formation of a bird nest-like structure containing poorly-crystalline brucite. The higher propensity of this poorly-crystalline phase for carbonation increased the utilisation of RMC as a binder and facilitated its conversion into strength-providing HMCs. Synergistic combination of M and HA led to significant strength gain via increased carbonate content and reduced w/b ratio. Presence of M provided micro-aggregates that facilitated the enhanced formation of large carbonate crystals with improved morphologies, resulting in microstructure densification and 113 % strength increase. Furthermore, partial replacement of RMC with M enabled reduction of natural resources, CO₂ emissions and energy consumption associated with RMC production.

本研究的重点是开发包含水菱镁矿 (H)、菱镁矿 (M) 和水合剂 (HA) 的碳酸化活性镁水泥 (RMC) 混凝土配方。用 H 和 M 部分替代 RMC 刺激了水合物和碳酸盐相的形成。H 的使用增加了水合的速率和程度，导致形成含有低结晶水镁石的鸟巢状结构。这种结晶较差的碳化相的较高倾向增加了 RMC 作为粘合剂的利用率，并促进了其转化为提供强度的 HMC。M 和 HA 的协同组合通过增加碳酸盐含量和降低 w/b 比导致显着的强度增加。M 的存在提供了微聚集体，促进了具有改进形态的大碳酸盐晶体的形成，导致微观结构致密化和 113% 的强度增加。此外，用 M 部分替代 RMC 可以减少自然资源、CO₂与 RMC 生产相关的排放和能源消耗。