Wang Xiangfei, Guo Guoliang, Liu Jinglei, Lv Chun, Bi Mingyan
College of Architecture and Civil Engineering, Qiqihar University, Qiqihar 161006, China.
Materials (Basel). 2025 Jul 11;18(14):3281. doi: 10.3390/ma18143281.
This research focuses on improving the characteristics of recycled concrete and utilizing solid waste resources through the combination of industrial waste pre-impregnation and the carbonation process. A novel pre-impregnation-carbonation aggregate method is proposed to increase the content of carbonatable components in the surface-bonded mortar of recycled coarse aggregate by pre-impregnating it with carbide slag slurry (CSS). This approach enhances the subsequent carbonation effect and thus the properties of recycled aggregates. The experimental results showed that the method significantly improved the water absorption, crushing value, and apparent density of the recycled aggregate. Additionally, it enhanced the compressive strength, split tensile strength, and flexural strength of the recycled concrete produced using the aggregate improved by this method. Microanalysis revealed that CO reacts with calcium hydroxide and hydrated calcium silicate (C-S-H) to produce calcite-type calcium carbonate and amorphous silica gel. These reaction products fill microcracks and pores on the aggregate and densify the aggregate-paste interfacial transition zone (ITZ), thereby improving the properties of recycled concrete. This study presents a practical approach for the high-value utilization of construction waste and the production of low-carbon building materials by enhancing the quality of recycled concrete. Additionally, carbon sequestration demonstrates broad promise for engineering applications.
本研究聚焦于通过工业废渣预浸渍与碳化过程相结合来改善再生混凝土性能并利用固体废弃物资源。提出了一种新颖的预浸渍 - 碳化骨料方法，通过用电石渣浆（CSS）对再生粗骨料进行预浸渍，以增加再生粗骨料表面粘结砂浆中可碳化成分的含量。该方法增强了后续的碳化效果，进而改善了再生骨料的性能。实验结果表明，该方法显著提高了再生骨料的吸水率、压碎值和表观密度。此外，它还提高了使用该方法改进后的骨料所制备的再生混凝土的抗压强度、劈裂抗拉强度和抗折强度。微观分析表明，CO与氢氧化钙和水化硅酸钙（C-S-H）反应生成方解石型碳酸钙和无定形硅胶。这些反应产物填充了骨料上的微裂缝和孔隙，并使骨料 - 浆体界面过渡区（ITZ）致密化，从而改善了再生混凝土的性能。本研究提出了一种通过提高再生混凝土质量实现建筑垃圾高值化利用和生产低碳建筑材料的实用方法。此外，碳封存展现出广阔的工程应用前景。
