Concrete possesses significant potential as a medium for CO sequestration. Nevertheless, conventional approaches like CO mixing and carbonation curing have shown limited efficacy in this regard. The present work introduces a groundbreaking method for enhancing CO reduction in concrete production. It involves preparing carbon sequestration precursors (CSP) through carbonation of cement reinforced by mechanochemical effects. The study investigated the kinetics and phase assemblage during the CSP production process, along with examining the impact of CSP on the reaction kinetics and strength development of cement composites. Due to the mechanochemical effects, CSP was characterized by the prevalence of metastable calcium carbonate (Cc) with a small crystalline size. Moreover, CSP not only accelerated the hydration of cement composites but also led to increased compressive strength at all ages, even with the replacement of 30 wt% of cement by CSP. The multifunctional attributes of CSP, including nucleation, reactant, and inert filler roles, contributed to its exceptional performance. Furthermore, utilizing the CSP method demonstrated a significant capacity for CO reduction, exceeding 36.5 %, which is more than seven times that of the traditional CO mixing method. The positive outcomes from this study underscore the high efficacy of the CSP method for efficient CO sequestration in concrete.

中文翻译：

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通过加速碳化制备碳封存前体来最大限度地减少混凝土中二氧化碳排放的创新策略


混凝土作为二氧化碳封存介质具有巨大的潜力。然而，CO 混合和碳酸化固化等传统方法在这方面的功效有限。目前的工作介绍了一种增强混凝土生产中二氧化碳减排的突破性方法。它涉及通过机械化学效应增强水泥的碳化来制备碳封存前体（CSP）。该研究调查了 CSP 生产过程中的动力学和相组合，并研究了 CSP 对水泥复合材料的反应动力学和强度发展的影响。由于机械化学效应，CSP 的特点是普遍存在晶体尺寸较小的亚稳态碳酸钙 (Cc)。此外，CSP 不仅加速了水泥复合材料的水化，而且提高了所有龄期的抗压强度，即使用 CSP 替代了 30 wt% 的水泥。 CSP 的多功能属性，包括成核、反应物和惰性填料作用，造就了其卓越的性能。此外，利用 CSP 方法显示出显着的 CO 减排能力，超过 36.5%，是传统 CO 混合方法的七倍多。这项研究的积极成果强调了 CSP 方法在混凝土中高效封存二氧化碳的高效性。