| Title: | Enhancing strength and ▫$CO_2$▫ uptake in lignite-based fly ash geopolymer mortar through supercritical carbonation |
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| Authors: | ID Podnar, Tinkara Marija (Author)
ID Knez, Željko (Author)
ID Kravanja, Gregor (Author) |
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| Files: |  1-s2.0-S0896844625001822-main.pdf (6,51 MB)
MD5: 6931239501C6CB5B5EEC14BB2CB6CAED
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FKKT - Faculty of Chemistry and Chemical Engineering
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| Abstract: | This study demonstrates the potential of supercritical CO₂ curing to enhance the performance and sustainability of lignite-based fly ash geopolymer mortar offering a promising approach to reducing CO₂ emissions in the construction industry while improving material properties. The research comprehensively compared conventional curing (GEO-REF) with supercritical CO₂ curing (GEO-CO₂), revealing that GEO-CO₂ samples exhibited higher compressive and flexural strengths, achieving peak performance almost immediately after curing. Supercritical CO₂ exposure resulted in enhanced carbonation, with a depth of up to 7.6 mm and a carbonation rate of up to 67 %. XRD confirmed phase changes due to CO₂ curing, with GEO-CO₂ showing additional calcium carbonate-calcite, calcium carbonate-aragonite, and calcium silicate hydroxide compared to GEO-REF. Nitrogen adsorption/desorption studies indicated larger pore diameters but a reduced BET surface area in GEO-CO₂ samples, suggesting structural changes due to CO₂ exposure. TGA analysis revealed that supercritical CO₂ curing reduced water retention and enhanced carbonation, resulting in increased CaCO₃ content and changes in Ca(OH)₂ levels. |
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| Keywords: | geopolymer, fly ash, carbonation, CO2 fixation, supercritical CO2, high pressure reactor |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 16.01.2025 |
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| Article acceptance date: | 12.06.2025 |
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| Publication date: | 18.06.2025 |
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| Publisher: | Elsevier B.V. |
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| Year of publishing: | 2025 |
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| Number of pages: | 12 str. |
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| Numbering: | Vol. 225, [article no.] 106695 |
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| PID: | 20.500.12556/DKUM-93908  |
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| UDC: | 66.02 |
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| ISSN on article: | 1872-8162 |
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| COBISS.SI-ID: | 241936131 |
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| DOI: | 10.1016/j.supflu.2025.106695 |
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| Copyright: | © 2025 The Author(s) |
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| Publication date in DKUM: | 25.07.2025 |
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| Views: | 164 |
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| Downloads: | 15 |
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| Metadata: |    |
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| Categories: | Misc.
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