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• W2885928981 abstract "This paper explores the impacts of sodium hydroxide modulus, alkali lye amount and liquid–solid ratio on the strength and microstructure of coal gangue geopolymer materials, involving a total of five sodium hydroxide moduli, four NH/NS mass ratios and seven liquid–solid ratios. To characterize the morphology and structure of coal gangue geopolymer materials, we carried out XRD, TG-DTG, FT-IR and SEM analysis on the specimens respectively. The results show that NH concentration has no impact on paste fluidity and has significant impact on compressive strength of geopolymers. Both paste fluidity and compressive strength of geopolymers increase with the increase in liquid–solid ratio. However, it should be noted that the compressive strength decreases with the increase in liquid–solid ratio when the liquid–solid ratio is greater than 0.32. The optimal NH/NS mass ratio is 1:1.5 ∼ 1:2. In comparison with P.O42.5 cement specimens, coal gangue geopolymers have higher initial strength and lower 28 d compressive strength. The analytical results of microstructure are consistent with those of compressive strength, which demonstrates that the polymerization products of coal gangue geopolymers are N-A-S-H gels and some other aluminosilicate zeolite crystals." @default.
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• W2885928981 date "2018-10-01" @default.
• W2885928981 modified "2023-10-13" @default.
• W2885928981 title "Preparation and characterization of coal gangue geopolymers" @default.
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• W2885928981 doi "https://doi.org/10.1016/j.conbuildmat.2018.07.220" @default.
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