超临界碳化对水泥基材料性能和孔径结构的影响

摘要

To investigate the application of supercritical carbonation technology on cement⁃based material modification, and to study the effects of supercritical carbonation on microscopic and macroscopic properties of cement⁃based materials, in this paper, the supercritical carbonation tests have been done to study the change of carbonation depth, strength, pore structure and carbon dioxide absorption of the cement paste, mortar and concrete. It is shown that supercritical carbonation is a powerful tool to achieve the fast carbonation, improve the pore structure, enhance the strength and leach resistance of the material, and absorb a large number of CO2 , which is significant meaningful for optimizing the hazard waste cement solidify and the environmental protection.%为了考察超临界碳化技术在水泥基材料改性方面的应用，研究超临界碳化对水泥基材料微观和宏观性能的影响，基于此设计了超临界二氧化碳碳化试验研究水泥砂浆、水泥净浆和混凝土试件的碳化深度、强度、孔径分布以及二氧化碳吸收量的变化。试验分析表明，超临界碳化可以快速实现水泥基材料的碳化，大幅提高试件强度，改善材料的孔径分布，使材料的中细径孔大幅降低，提高材料的抗渗透能力，为改善重金属等危害废物的水泥基固化效果提供了依据。同时超临界碳化可以将大量二氧化碳转化在碳酸钙中沉淀吸收，具有重要的环境保护意义。