The escalating impact of climate change, primarily driven by greenhouse gas emissions, has prompted global efforts to achieve carbon neutrality. Ordinary Portland cement production contributes approximately 7% to global carbon dioxide (CO) emissions, necessitating innovative approaches for its sustainable production. A novel method is introduced that utilizes a sodium hydroxide (NaOH) solution captured with CO as an alkali activator for ground granulated blast furnace slag (GGBFS); it can substitute for the cement in producing construction materials. The method integrates CO-dissolved alkaline solutions into the activation process of GGBFS, which results in the production of sustainable alkali-activated slag materials. Various concentrations of dissolved CO in the NaOH-based activator were used to evaluate their impact on compressive strength, setting time, and changes in phase composition. The results demonstrate that higher CO concentrations lead to increased compressive strength, but an excess hinders early-age strength development. X-ray diffraction and thermogravimetry analyses explain the phase changes during carbonation, emphasizing the role of CO in forming calcite and enhancing C-S-H production. Additionally, the study quantifies CO uptake, revealing a linear relationship with dissolved CO concentrations.

中文翻译：

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用于可持续碱激活炉渣的碳捕获氢氧化钠溶液

主要由温室气体排放驱动的气候变化影响不断升级，促使全球努力实现碳中和。普通波特兰水泥生产约占全球二氧化碳 (CO) 排放量的 7%，因此需要创新方法来实现可持续生产。介绍了一种利用 CO 捕获的氢氧化钠 (NaOH) 溶液作为研磨粒化高炉矿渣 (GGBFS) 的碱活化剂的新方法；可替代水泥生产建筑材料。该方法将溶解CO的碱性溶液整合到GGBFS的活化过程中，从而生产出可持续的碱活化矿渣材料。使用 NaOH 基活化剂中不同浓度的溶解 CO 来评估其对抗压强度、凝固时间和相组成变化的影响。结果表明，较高的二氧化碳浓度会导致抗压强度增加，但过量会阻碍早期强度的发展。 X 射线衍射和热重分析解释了碳化过程中的相变，强调了 CO 在形成方解石和提高 CSH 产量中的作用。此外，该研究还量化了二氧化碳的吸收量，揭示了与溶解的二氧化碳浓度的线性关系。