Study on the mechanical properties and hydration mechanism of alkali activated copper slag fly ash composite cementitious material
Li Bowen1, Cheng Yunhai1, Li Weili2, Wang Yong2, Zhou Yuncong3
1. Anhui University of Technology, School of Mining Engineering, Huainan 232001, China;
2. Coal Industry Hefei Design and Research Institute Company, Hefei 230000, China; 3. Shandong University
of Science and Technology, Tai'an 271002, China
In order to explore the feasibility and performance of using alkaline activators to prepare copper slag fly ash composite cementitious materials, copper slag and fly ash were selected as the main raw materials, and the optimal ratio, activator type and concentration were determined through experiments. It was found that the mechanical properties of the material were optimal when 7.5% sodium silicate was used as the activator. Excessive alkaline activator can lead to alkalization, increased adhesion with the mold, difficulty in demolding, and even decrease the strength of the finished product. Therefore, strict control of the dosage of activator is necessary in the production process. Through experimental analysis of the effects of different variables on material properties, including raw material fineness, activator concentration, curing conditions, etc., the optimized preparation process was determined. The experimental results show that the optimized composite material has a strength of 71 MPa within 28 days, which is significantly better than ordinary Portland cement. While early strength development is rapid, later strength growth is slow, but overall performance is still superior. It was provided that theoretical basis and practical support for its practical engineering applications.In this paper, the formation mechanism of aluminosilicate gel was revealed and the formula and process were further optimized by combining microstructure analysis and practical application research. The research results have shown that this material has significant environmental benefits and economic potential. Its broad application prospects not only partially replace traditional cement, but also achieve efficient resource utilization of industrial waste, promoting sustainable development of the construction industry. By continuously optimizing technology and reducing costs, alkali activated copper slag fly ash composite cementitious materials will play a greater role in the fields of green buildings and environmentally friendly materials.
李博闻1，成云海1，李伟利2，王 勇2，周云聪3. 碱激发铜渣-粉煤灰复合胶凝材料的力学性能及水化机理研究[J]. 煤炭与化工, 2024, 47(10): 141-148.
Li Bowen1, Cheng Yunhai1, Li Weili2, Wang Yong2, Zhou Yuncong3. Study on the mechanical properties and hydration mechanism of alkali activated copper slag fly ash composite cementitious material. CCI, 2024, 47(10): 141-148.
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