Study on the influence mechanism of flue gas desulphurisation gypsum on solid waste-based geopolymer grouting materials

•1.The 120℃ FGDG promoted the hydration reaction of CFBFA-CS-FGDG cementitious system.•2. The 120℃ FGDG generated more whiskers, improving the structure of the material.•3. It had good engineering applicability of CFBFA-CS-FGDG cementitious system. Solid waste-based geopolymer grouting materials wer...

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Veröffentlicht in:Construction & building materials 2023-11, Vol.403, p.133137, Article 133137
Hauptverfasser: Duan, Dedan, Song, Huiping, Liu, Fanyu, Liu, Qian, Fan, Zhenlian, Cheng, Huaigang, Cheng, Fangqin
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Sprache:eng
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Zusammenfassung:•1.The 120℃ FGDG promoted the hydration reaction of CFBFA-CS-FGDG cementitious system.•2. The 120℃ FGDG generated more whiskers, improving the structure of the material.•3. It had good engineering applicability of CFBFA-CS-FGDG cementitious system. Solid waste-based geopolymer grouting materials were prepared using fly ash, calcium carbide slag, and flue gas desulphurisation gypsum as the main raw materials. The effect of desulphurisation gypsum dried at different temperatures on the performance of the solid waste-based geopolymer grouting materials was explored. The mechanical properties, phase composition, and microstructure of the grouting materials were determined using a universal testing machine, X-ray diffraction, scanning electron microscopy, and thermogravimetric analysis. The results show that flue gas desulphurisation gypsum dried at 120 °C generated more whiskers. The mechanical properties of the solid waste-based geopolymer grouting materials prepared by drying flue gas desulphurisation gypsum at 120 °C were significantly improved, and the compressive strength was increased by more than 11%, thereby promoting the hydration reaction of the system and generating over 3% of the hydration products.
ISSN:0950-0618
1879-0526
DOI:10.1016/j.conbuildmat.2023.133137