Abstract The emergence of the modern Portland cement has led to the downfall of lime as a construction material. Consequentially, its use has been limited to repair and restoration of historical buildings. Yet, its lower calcination temperature (~950 °C) and the ability to gain strength through carbonation implies its potential as a sustainable alternative to cement. In this study, calcined limestone was studied concerning its carbonation and strength development. Superplasticizer, raw limestone, and different carbonation regimes were explored as techniques to improve the composite strength development, a shortfall that hinders its re-adoption. The results indicated that the raw limestone as a partial replacement of the calcined limestone significantly improved the carbonation degree and mechanical properties. The average compressive strength reached 20 MPa under 20% CO2 due to the formation of an interconnected network of calcite as the dominant carbonation product. Supercritical CO2, in contrast, formed disjoint particles or agglomerates of carbonates.

中文翻译：

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煅烧石灰石作为潜在建筑材料的碳化、强度发展和表征

摘要 现代硅酸盐水泥的出现导致石灰作为建筑材料的衰落。因此，它的使用仅限于修复和修复历史建筑。然而，其较低的煅烧温度 (~950 °C) 和通过碳化获得强度的能力意味着其作为水泥的可持续替代品的潜力。在这项研究中，对煅烧石灰石的碳化和强度发展进行了研究。超塑化剂、生石灰石和不同的碳酸化制度被探索作为提高复合材料强度发展的技术，这是阻碍其重新采用的不足之处。结果表明，生石灰石作为部分煅烧石灰石的替代品，显着提高了碳化程度和力学性能。由于方解石作为主要碳化产物的互连网络的形成，平均抗压强度在 20% CO2 下达到 20 MPa。相反，超临界 CO2 形成不相交的碳酸盐颗粒或团块。