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Effect of an alkali activators on the compressive strength and reaction mechanism of coal gangue-slag-fly ash geopolymer grouting materials
Abstract To enable effective raw coal gangue use, the effects of various alkali activators on coal gangue-slag-fly ash geopolymer grouting material (CSFGM) were investigated. Results showed that for sodium silicate modulus at 1.4, sodium silicate content at 12% and Na2O content at 6%, CSFGM showed the highest compressive. The compressive strength of CSFGM was related to the porosity and the proportion of 0.01–1 μm pores, and the main reaction product was C-(N)-A-S-H gel. The sodium silicate modulus had no significant effect on the reaction products. An increased sodium silicate content caused ordering of the C-(A)-S-H gel, but the consumption of Na2O reduced muscovite depolymerization. The higher Na2O content increased the C-(N)-A-S-H gel, leading to a further refined microstructure with reduced porosity. At 4% sodium silicate incorporating, the increase of Na2O content mainly promotes the depolymerization and polycondensation reaction of precursors. At 12% of sodium silicate incorporating, the increase of Na2O content promotes the better participation of sodium silicate in the polycondensation reaction of precursors.
Highlights CG can be used as a precursor to prepare geopolymer grouting materials. The main reaction product of CSFGM is C-(N)-A-S-H gel. Adapting the alkali activator enhances kaolinite and muscovite reactions in CG. High sodium silicate system requires increased alkalinity for polycondensation.
Effect of an alkali activators on the compressive strength and reaction mechanism of coal gangue-slag-fly ash geopolymer grouting materials
Abstract To enable effective raw coal gangue use, the effects of various alkali activators on coal gangue-slag-fly ash geopolymer grouting material (CSFGM) were investigated. Results showed that for sodium silicate modulus at 1.4, sodium silicate content at 12% and Na2O content at 6%, CSFGM showed the highest compressive. The compressive strength of CSFGM was related to the porosity and the proportion of 0.01–1 μm pores, and the main reaction product was C-(N)-A-S-H gel. The sodium silicate modulus had no significant effect on the reaction products. An increased sodium silicate content caused ordering of the C-(A)-S-H gel, but the consumption of Na2O reduced muscovite depolymerization. The higher Na2O content increased the C-(N)-A-S-H gel, leading to a further refined microstructure with reduced porosity. At 4% sodium silicate incorporating, the increase of Na2O content mainly promotes the depolymerization and polycondensation reaction of precursors. At 12% of sodium silicate incorporating, the increase of Na2O content promotes the better participation of sodium silicate in the polycondensation reaction of precursors.
Highlights CG can be used as a precursor to prepare geopolymer grouting materials. The main reaction product of CSFGM is C-(N)-A-S-H gel. Adapting the alkali activator enhances kaolinite and muscovite reactions in CG. High sodium silicate system requires increased alkalinity for polycondensation.
Effect of an alkali activators on the compressive strength and reaction mechanism of coal gangue-slag-fly ash geopolymer grouting materials
Guo, Lingzhi (Autor:in) / Liu, Juanhong (Autor:in) / Zhou, Mei (Autor:in) / An, Shuhao (Autor:in)
25.03.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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