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Volume 44 All articles Published: 13 May 2021 Article ID 0138
Optimization of compressive strength of fly ash-based geopolymers using central composite design
G MOUTAOUKIL S ALEHYEN I SOBRADOS M FADIL M TAIBI
In this study, fly ash-based geopolymers (FAG$_s$) were prepared by using fly ash (FA) as a source of aluminosilicates and a mixture of sodium hydroxide and sodium silicate as an alkaline activator. This study aims at optimization of compressive strength of FAG tested after 7 and 28 curing days, using the central composite design. Two factors that mainly affected the compressive strengths of the samples were selected: sodium silicate to sodium hydroxide ratio (three levels 1.5, 2.5 and 3.5) and FA/alkaline solution ratio (three levels 1.5, 2.5 and 3.5). The prepared geopolymers were characterized using several analytical methods, such as X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy with energy dispersive X-ray analyses. The optimum compressive strength obtained was 32 MPa with Na$_2$SiO$_3$/NaOH ratio = 2.5 and solid/liquid ratio = 2.5.
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Bulletin of Materials Science
Volume 46, 2023
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Dr Shanti Swarup Bhatnagar for Science and Technology
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