马维, 何兆益. 碱激发矿渣粉煤灰地质聚合物力学性能改性及其混凝土性能[J]. 矿产综合利用, 2024, 45(4): 182-189. DOI: 10.3969/j.issn.1000-6532.2024.04.027
    引用本文: 马维, 何兆益. 碱激发矿渣粉煤灰地质聚合物力学性能改性及其混凝土性能[J]. 矿产综合利用, 2024, 45(4): 182-189. DOI: 10.3969/j.issn.1000-6532.2024.04.027
    MA Wei, HE Zhaoyi. Mechanical property modification of alkali-activated slag fly ash-based geopolymer and its concrete property[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(4): 182-189. DOI: 10.3969/j.issn.1000-6532.2024.04.027
    Citation: MA Wei, HE Zhaoyi. Mechanical property modification of alkali-activated slag fly ash-based geopolymer and its concrete property[J]. Multipurpose Utilization of Mineral Resources, 2024, 45(4): 182-189. DOI: 10.3969/j.issn.1000-6532.2024.04.027

    碱激发矿渣粉煤灰地质聚合物力学性能改性及其混凝土性能

    Mechanical Property Modification of Alkali-activated Slag Fly Ash-based Geopolymer and its Concrete Property

    • 摘要: 这是一篇陶瓷及复合材料领域的论文。碱激发矿渣粉煤灰地质聚合物(ASFG)具有早期强度高、耐酸碱等优异性能,但脆性大、韧性差等缺陷影响其推广应用。为改善ASFG的性能且拓宽可应用于ASFG改性的矿物掺合料种类,以偏高岭土、沸石粉、膨润土、硅灰石粉、轻质碳酸钙和硅灰六种矿物掺合料作为改性材料,研究了其对ASFG力学性能的改性效果,并确定了硅灰为较佳改性材料。为深入探索硅灰对ASFG力学性能的改善作用,研究了硅灰掺量对ASFG力学性能的影响,并确定了硅灰的较佳掺量。最后,制备了碱激发矿渣-粉煤灰-硅灰地质聚合物混凝土(ASFSGC),并研究了其工作性、准静态力学性能和抗渗性。结果表明:膨润土、硅灰石粉、轻质碳酸钙、硅灰四种矿物掺合料对ASFG的抗折强度具有明显增强效果。硅灰石粉、硅灰两种矿物掺合料对ASFG的抗压强度具有明显增强效果。对ASFG而言,硅灰是一种优质矿物掺合料。随着硅灰掺量的增大,ASFG的力学性能先增大后减小,硅灰的较佳掺量为4%。ASFSGC具有良好的工作性、优异的抗渗性能,且ASFSGC的延性较普通硅酸盐水泥混凝土提高了14.1%。

       

      Abstract: This is an article in the field of ceramics and composites. Alkali-activated Slag-fly Ash-based Geopolymer (ASFG) has excellent properties such as high early strength, acid and alkali resistance, but its large brittleness and poor toughness affect its popularization and application. In order to improve the properties of ASFG and broaden the types of mineral admixtures that can be used for ASFG modification, six kinds of mineral admixtures, including metakaolin, zeolite powder, bentonite, wollastonite powder, light calcium carbonate and silica fume, are used as modified materials, and their modification effects on ASFG are studied. The optimum modified material is silica fume. In order to further explore the improvement effect of silica fume on the mechanical properties of ASFG, the effect of the content of silica fume on the mechanical properties of ASFG is studied, and the optimal content of silica fume is determined. Finally, Alkali-activated Slag-fly Ash-silica Fume-based Geopolymer Concrete (ASFSGC) is prepared, and its workability, quasi-static mechanical properties and impermeability are studied. The results show that bentonite, wollastonite powder, light calcium carbonate and silica fume can significantly improve the flexural strength of ASFG. Wollastonite powder and silica fume can significantly improve the compressive strength of ASFG. For ASFG, silica fume is a premium mineral admixture. With the increase of silica fume content, the mechanical properties of ASFG first increase and then decrease, and the optimal content of silica fume is 4%. ASFSGC has good workability and excellent impermeability, and the ductility of ASFSGC is 14.1% larger than that of ordinary Portland cement concrete.

       

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