The construction industry has been facing significant challenges in reducing CO₂ emissions. As such, accelerated carbonation has attracted explosive attention in view of its ability to bind CO₂ back to construction materials while improving their performance. Water is a decisive factor in carbonation because it bridges the reaction between gaseous CO₂ and solid precursors, and three distinct approaches of carbonation have been developed depending on the amount of water present at carbonation. In this paper, specific roles of water in several parallel mechanisms of carbonation are revealed and then a holistic understanding on the impact of water is established by reviewing and comparing the efficiency, mineralogy and microstructure changes of cementitious materials and calcium-based solid wastes after dry, semi-wet, and wet carbonation. The differences in solid phase dissolution, calcium carbonate precipitation and re-crystallization, aluminosilicate polymerization, microstructure rebuilding, pore structure evolution, specific surface area development, etc. at different water availability are highlighted. Additionally, modified carbonation techniques based on different water content are also summarized and discussed. Overall, awareness of water’s impact on carbonation facilitates the efficient and effective production of sustainable construction materials and maximizes the reduction in CO₂ emission.

中文翻译：

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水对加速碳化影响的综述：对生产可持续建筑材料的影响


建筑行业在减少二氧化碳排放方面一直面临重大挑战。因此，加速碳酸化引起了爆炸性的关注，因为它能够将 CO₂ 结合回建筑材料，同时提高其性能。水是碳酸化的决定性因素，因为它在气态 CO₂ 和固体前体之间的反应之间架起了桥梁，并且根据碳酸化时存在的水量，已经开发了三种不同的碳酸化方法。在本文中，揭示了水在几种平行的碳化机制中的具体作用，然后通过回顾和比较干、半湿和湿碳化后胶凝材料和钙基固体废物的效率、矿物学和微观结构变化，建立了对水影响的整体理解。重点介绍了不同水有效性下固相溶解、碳酸钙沉淀和再结晶、铝硅酸盐聚合、微观结构重构、孔隙结构演变、比表面积发展等方面的差异。此外，还总结和讨论了基于不同含水量的改性碳酸化技术。总体而言，了解水对碳化的影响有助于高效和有效地生产可持续建筑材料，并最大限度地减少 CO₂ 排放。