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Preliminary Study on CO2 Sequestration in High-Calcium Fly Ash Geopolymer Cement via Direct Air CO2 Capture

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Abstract:

This study investigates CO₂ sequestration in high-calcium fly ash (HCFA) geopolymer cement through combined heat and CO₂ curing. Class C fly ash from the lignite-fired power plant was activated with 10 M NaOH (L/B = 0.40). Two curing regimes were applied: heat curing at 60 °C for 24 h (Typical GP) and heat curing followed by CO₂ curing at 15 % v/v for 24 h (CO₂ Curing GP). CO₂ curing increased the average compressive strength by 7.16 %, from 15.75 to 16.87 MPa. Phenolphthalein testing revealed a ~4.3-fold increase in carbonation area and a greater average penetration depth, from 1.9 to 7.9 mm, compared with the control. XRD confirmed calcite as the main carbonation product, along with hematite, magnetite, sodium sulfate, and ye’elimite. This work represents an initial step toward applying industrial CO₂-rich gas for geopolymer curing in Thailand, offering dual benefits of improved mechanical performance and significant CO₂ capture potential for sustainable construction.

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Periodical:

Key Engineering Materials (Volume 1053)

Pages:

111-116

DOI:

https://doi.org/10.4028/p-0h8XZt

Citation:

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Online since:

May 2026

Authors:

Kasidin Patcharapat, Teewara Suwan*, Chotiros Boonpeng, Tawatchai Tanchaisawat, Peerapong Jitsangiam, Mizi Fan

Keywords:

By-Product Raw Material, Carbon Capture Ability, CO₂ Curing, Geopolymer Cement, High Calcium Fly Ash, Industrial Flue Gas

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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