Correlation of Quality Assessment Methods of Class F Fly as for Synthesis of Geopolymers

Abstract:

The demand of highly effective aluminosilicates such as class F fly ash for use in geopolymer synthesis initiated a strong scientific interest for a design of the quality assessment methods. At the same time, the existing assessment methods apparently differ in key parameters which determine the quality of aluminosilicate. This research was focused on determination of relationship between the key parameters of different assessment methods for different types of low-calcium fly ash with high portion of vitreous phase. The insoluble aluminosilicate portion in fly ash that remained after treatment in aggressive acidic media followed by high-temperature treatment at 1000 °C (or the parameter α) was measured in this study. The experimental data showed a very low correlation (R²=0.34) between parameter α and compressive strength of the fly-ash based geopolymer paste. The correlation factors between such genetic parameters of fly ash as portion of vitreous phase (C), SiO₂-bonding degree in vitreous phase (f_Si) and parameter α demonstrated dramatically different values: R² _(С-α)=0.01; R²(f_Si-α)=0.71; R² _(С-f_Si)=0.0, respectively.

• Periodical: Materials Science Forum (Volume 974)
• Pages: 61-66
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.974.61
• Online since: December 2019
• Authors: Natalia Ivanovna Kozhukhova*, I.V. Zhernovskaya, M.I. Kozhukhova, E.V. Voitovich
• Keywords: Aluminosilicate, Class F Fly Ash, Correlation Method, Geopolymer Synthesis, Quality Assessment

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