| Naslov: | Enhancing strength and ▫$CO_2$▫ uptake in lignite-based fly ash geopolymer mortar through supercritical carbonation |
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| Avtorji: | ID Podnar, Tinkara Marija (Avtor)
ID Knez, Željko (Avtor)
ID Kravanja, Gregor (Avtor) |
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| Datoteke: |  1-s2.0-S0896844625001822-main.pdf (6,51 MB)
MD5: 6931239501C6CB5B5EEC14BB2CB6CAED
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| Jezik: | Angleški jezik |
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| Vrsta gradiva: | Članek v reviji |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: | FKKT - Fakulteta za kemijo in kemijsko tehnologijo
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| Opis: | 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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| Ključne besede: | geopolymer, fly ash, carbonation, CO2 fixation, supercritical CO2, high pressure reactor |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Poslano v recenzijo: | 16.01.2025 |
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| Datum sprejetja članka: | 12.06.2025 |
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| Datum objave: | 18.06.2025 |
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| Založnik: | Elsevier B.V. |
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| Leto izida: | 2025 |
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| Št. strani: | 12 str. |
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| Številčenje: | Vol. 225, [article no.] 106695 |
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| PID: | 20.500.12556/DKUM-93908  |
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| UDK: | 66.02 |
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| COBISS.SI-ID: | 241936131 |
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| DOI: | 10.1016/j.supflu.2025.106695 |
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| ISSN pri članku: | 1872-8162 |
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| Avtorske pravice: | © 2025 The Author(s) |
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| Datum objave v DKUM: | 25.07.2025 |
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| Število ogledov: | 161 |
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| Število prenosov: | 15 |
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| Metapodatki: |    |
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| Področja: | Ostalo
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