Gong Miaomiao, Shen Ao, Wang Yiyi, Lin Haoran, He Rui
College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi, 830052, Xinjiang, People's Republic of China.
Xinjiang Hydraulic Engineering Geotechnical and Structural Engineering Technology Research Center, Urumqi, 830052, Xinjiang, People's Republic of China.
Sci Rep. 2025 Jan 29;15(1):3681. doi: 10.1038/s41598-025-88194-y.
Aiming at the problem that it is difficult to realize low-cost, high-performance and large-scale utilization of cementitious materials prepared from bulk solid wastes, this paper constructs a set of composite cementitious system based on alkaline activation of slag and fly ash (FA) by calcium carbide slag (CCS) and synergistic activation of sodium sulfate (NaSO) as a chemical dopant. The influence of factors such as solid waste type, mixing ratio, and NaSO content on the mechanical properties of composite cementitious systems was investigated by assessing compressive strength and analyzing microstructure using XRD, SEM-EDS, and FTIR. The test results indicate that CCS and NaSO exert significant influences on the strength of the composite cementitious system. CCS acts as an alkali activator, enhancing the system's hydration with an optimal dosage of 25%. Low NaSO content also promotes hydration, but higher concentrations disrupt the internal structure of the cementitious system post-coagulation, with an optimal content of 6%. The Projection Pursuit Regression (PPR) strength prediction model can fit the actual experimental data very well, which provides a feasible method for the proportion design and mechanical strength prediction of all-solid-waste cementitious systems.
针对大宗固体废弃物制备胶凝材料难以实现低成本、高性能及大规模利用的问题，本文构建了一套基于电石渣（CCS）对矿渣和粉煤灰（FA）进行碱激发以及以硫酸钠（NaSO）作为化学掺杂剂进行协同激发的复合胶凝体系。通过评估抗压强度并利用XRD、SEM-EDS和FTIR分析微观结构，研究了固体废弃物类型、配合比以及NaSO含量等因素对复合胶凝体系力学性能的影响。试验结果表明，CCS和NaSO对复合胶凝体系的强度有显著影响。CCS作为碱激发剂，最佳掺量为25%时可增强体系的水化作用。低含量的NaSO也能促进水化，但较高浓度会在水泥凝结后破坏胶凝体系的内部结构，最佳含量为6%。投影寻踪回归（PPR）强度预测模型能够很好地拟合实际试验数据，为全固废胶凝体系的配合比设计和力学强度预测提供了一种可行的方法。
