【摘要】 开展大宗固废综合利用是我国深入实施可持续发展战略的重要内容。赤泥与煤矸石均属于我国的大宗工业固废，具有量大、应用面广、环境影响突出、应用前景广阔的特点。本文设计以赤泥、煤矸石及锂渣等为原料的固废基掺合料，并利用固废基掺合料替代水泥制备复合胶凝材料。探究固废原料配合比、固废基掺合料替代水泥比例对复合胶凝材料力学性能、抗氯离子侵蚀能力、孔结构及微观形貌的影响规律。结果表明，固废基掺合料虽然降低了复合胶凝材料的力学性能，但能够显著提升抗氯离子侵蚀能力。赤泥、煤矸石、锂渣协同配制优化了固废基掺合料的矿相组成，使得固废基掺合料固溶微量元素，形成高活性固溶体矿物。尤其是锂渣的加入，能够进一步提升复合胶凝材料的水化活性，提高力学强度及抗氯离子侵蚀能力。本研究有望为固废基掺合料的开发与应用提供理论参考。更多还原

【Abstract】 The comprehensive utilization of bulk solid waste is an important aspect of China’s in-depth implementation of sustainable development strategy. Both red mud and coal gangue belong to China’s bulk industrial solid waste, which have the characteristics of large amount, wide application, outstanding environmental impact and broad utilization prospects. In this paper, a solid waste-based admixture with red mud, coal gangue and lithium slag as raw materials was designed, and the composite cementitious materials were prepared by replacing cement with a solid waste-based admixture. The effects of the mix ratio of solid waste raw materials and the ratio of admixture instead of cement on the mechanical properties, chloride ion corrosion resistance, pore structure and microstructure of composite cementitious materials were investigated. The results show that although the solid waste-based admixture reduces the mechanical properties of the composite cementitious material, it can significantly improve the chloride ion corrosion resistance. The synergistic preparation of red mud, coal gangue and lithium slag optimizes the mineral phase composition of solid waste-based admixtures, so that the admixtures dissolve trace elements and form highly active minerals. In particular, the addition of lithium slag can further enhance the hydration activity of the composite cementitious material, improve its mechanical strength and chloride ion corrosion resistance. This study is expected to provide a theoretical reference for the development and application of solid waste-based admixtures.更多还原