Formulation of a sustainable geopolymeric binder based on pulp mill fly ash for subgrade stabilization
Chinchu Cherian, Sumi Siddiqua
In the proceedings of: GeoVirtual 2020: 73rd Canadian Geotechnical ConferenceABSTRACT: In this study, an inorganic geopolymer binder based on non-hazardous pulp mill fly ash was developed for sustainable soil stabilization using alkali-silicate activation method. The formulation of fly ash-geopolymer was optimized in terms of maximum strength development, with considering key influencing parameters such as ash dosage, activator chemistry (NaOH molarity, and NaOH/Na2SiO3 ratio), activator/ash ratio, and curing period. The optimum conditions for achieving higher rate of fly ash geopolymerization was determined to be 20% ash and 5 molar NaOH in 1:1 activator/ash and NaOH/ Na2SiO3 ratios. Microstructural examination using SEM-EDS analysis revealed the formation of uniform and dense geopolymer network on soil surface and pores with high calcium and silica concentration, causing significant subgrade strength improvement.
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Cherian, Chinchu, Siddiqua, Sumi (2020) Formulation of a sustainable geopolymeric binder based on pulp mill fly ash for subgrade stabilization in GEO2020. Ottawa, Ontario: Canadian Geotechnical Society.
@article{Cherian_GEO2020_143,
author = Chinchu Cherian, Sumi Siddiqua,
title = Formulation of a sustainable geopolymeric binder based on pulp mill fly ash for subgrade stabilization ,
year = 2020
}
title = Formulation of a sustainable geopolymeric binder based on pulp mill fly ash for subgrade stabilization ,
year = 2020
}