The influence of limestone powder (primarily composed of calcite) on hydration and properties of concrete has been extensively researched. However, there is limited understanding of how different calcium carbonate (CC) polymorphs affect cement hydration due to the difficulty in formation of vaterite. Therefore, preparing calcite and vaterite from solid waste carbide residue (CS) by wet carbonation and examining influence of these two CC polymorphs (0–20 %) on cement hydration and properties are comprehensive investigated in the paper. The results reveal that pure cubic calcite can be obtained through CS carbonation, while high-purity spherical vaterite can be synthesized using glycine as a regulator. The specific surface area (SSA) of spherical vaterite (15.47 m/g) is approximately three times that of calcite (4.8 m/g) with a comparable particle size distribution (PSD). The addition of calcite reduces the flowability of cement, whereas vaterite enhances it. The cement mortar with calcite demonstrates a lower compressive strength, while the incorporation of vaterite results in a higher or comparable compressive strength in contrast to control sample. Compared with control cement hydration, new hydration products, like monocarbonate aluminate and hemicarbonate aluminate, are formed with the addition of both calcite and vaterite. The metastable vaterite exhibits increased reactivity. The research presents a novel approach for the valorisation of solid wastes through CO sequestration, offering insights into the preparation of highly added-value products.

中文翻译：

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通过电石残渣的湿碳化生产球霰石：提高水泥性能和二氧化碳封存

石灰石粉（主要由方解石组成）对混凝土水化和性能的影响已得到广泛研究。然而，由于球霰石难以形成，人们对不同碳酸钙（CC）多晶型物如何影响水泥水化的了解有限。因此，本文对固体废电石残渣（CS）进行湿式碳化制备方解石和球霰石，并考察这两种CC晶型（0-20％）对水泥水化和性能的影响。结果表明，CS碳酸化可以得到纯立方方解石，而甘氨酸作为调节剂可以合成高纯度的球形球霰石。球形球霰石的比表面积 (SSA) (15.47 m/g) 大约是具有相当粒度分布 (PSD) 的方解石 (4.8 m/g) 的三倍。添加方解石会降低水泥的流动性，而球霰石则增强其流动性。与对照样品相比，含有方解石的水泥砂浆表现出较低的抗压强度，而掺入球霰石导致较高或相当的抗压强度。与对照水泥水化相比，方解石和球霰石的加入形成了新的水化产物，如单碳酸盐铝酸盐和半碳酸盐铝酸盐。亚稳态球霰石表现出增加的反应性。该研究提出了一种通过二氧化碳封存来实现固体废物价值的新方法，为高附加值产品的制备提供了见解。