硅灰、粉煤灰对矿渣基地质聚合物性能的影响
收稿日期: 2024-08-26
网络出版日期: 2025-12-23
基金资助
重庆市科技局重点项目（揭榜挂帅）(cstc2021jscx-jbgs0029)
Effect of silica fume and fly ash on properties of slag-based geopolymer
Received date: 2024-08-26
Online published: 2025-12-23
研究探讨了硅灰和粉煤灰对矿渣基地质聚合物的力学性能、水化产物及微观结构的影响，研究不同比例的硅灰、粉煤灰对矿渣基地质聚合物砂浆力学性能的影响，并采用XRD、FT-IR、SEM对其水化机理和微观结构进行分析。研究表明：硅灰掺量为10%（质量分数，下同），水玻璃模数为1.2和掺量为25%时效果最优，3、7、28 d的抗压强度分别为54、68、72 MPa；添加粉煤灰效果较差，粉煤灰掺量为10%，水玻璃模数为1.2和掺量为25%时效果较好，3、7、28 d的抗压强度分别为53、58、62 MPa。硅灰的加入填充矿渣基地质聚合物孔隙，大量SiO2与OH-反应使Si—O键断裂反应形成水化硅铝酸钙［C-（A）-S-H］和水化硅铝酸钠［N-（A）-S-H］凝胶，改善矿渣基地质聚合物的力学性能、水化反应及微观结构；但过量的硅灰会限制凝胶的生成，导致抗压强度下降；对比纯矿渣地质聚合物7、28 d的抗压强度分别提升了23.6%、9.1%。由于粉煤灰的活性和钙含量较低，掺入粉煤灰阻碍矿渣基地质聚合物的水化反应且微观裂缝更大。因此，硅灰与矿渣结合才能制备出高强地质聚合物胶凝材料。
冯浩 , 秦猛 , 何兆益 , 毕研立 , 宋宇 , 杜友成 . 硅灰、粉煤灰对矿渣基地质聚合物性能的影响[J]. 无机盐工业, 2025 , 57(11) : 91 -99 . DOI: 10.19964/j.issn.1006-4990.2024-0471
In this study，silica fume and fly ash used to improve the mechanical properties，hydration reaction and microstructure of slag-based geopolymer were disscussed.The effects of different proportions of silica fume and fly ash on the mechanical properties of the geopolymer mortar were studied，and the hydration mechanism and microstructure were analyzed by XRD，FTIR and SEM.The research showed that the effect of 10% silica fume and 1.2 and 25% sodium silicate was the best，and the compressive strength of 3，7 d and 28 d could reach 54，68 MPa and 72 MPa，while the effect of fly ash was poor，and the effect of 3，7 d and 28 d was better when the content was 10% and 1.2 and 25% of sodium silicate.The strength was 53，58 MPa and 62 MPa respectively.The addition of silica ash filled the pores of the geopolymer of the slag-based，and a large amount of SiO2 reacted with OH-，resulting in the Si—O bond fracture reaction to form calcium silicate aluminate hydrate［C-（A）-S-H］ and sodium silicate aluminate hydrate［N-（A）-S-H］ gels，which improved the mechanical properties，hydration reaction and microstructure of the geopolymer of the slag-based.However，excess silica ash would restrict the formation of gel，resulting in decreased compressive strength.The compressive strength of pure slag ground geopolymer for 7 d and 28 d was increased by 23.6%，9.1% respectively.Due to the activity and low calcium content of fly ash，the incorporation of fly ash hindered the hydration reaction of the geopolymer in the slag-based and the microscopic cracks were larger.Therefore，the combination of silica fume and slag could produce the high strength geopolymer cementing materias.
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