| Naslov: | Rapid immobilisation of chemical reactions in alkali-activated materials using solely microwave irradiation |
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| Avtorji: | ID Tesovnik, Anže (Avtor)
ID Horvat, Barbara (Avtor) |
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| Datoteke: |  URL - Izvorni URL, za dostop obiščite http://hdl.handle.net/20.500.12556/DiRROS-20199
URL - Izvorni URL, za dostop obiščite https://www.mdpi.com/2075-163X/14/12/1219
 PDF - Predstavitvena datoteka, prenos (11,10 MB)
MD5: C8BB23FE3A42B17D8F776F1631CCEB80
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| Jezik: | Angleški jezik |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: |  ZAG - Zavod za gradbeništvo Slovenije
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| Povzetek: | Efflorescence, a time-dependent and water-driven phenomenon, is a major concern inalkali-activated materials (AAMs), impacting their practical use and preservation in a time-frozen state for post-characterisation. Although a method for stopping chemical reactions in conventional cements exists, it is time-consuming and not chemical-free. Therefore, this study explored the effects of low-power microwave-induced dehydration on efflorescence, mechanical performance, and structural integrity in AAMs, to create an alternative and more “user-friendly” dehydration method. For this purpose, several mixtures based on secondary raw (slag, fly ash, glass wool, and rock wool) and non-waste (metakaolin) materials were activated with a commercial Na-silicate solution in ratios that promoted or prevented efflorescence. Characterisation techniques, including Fourier-transform infrared spectroscopy and X-ray diffraction, showed that microwave dehydration effectively removed water without altering crystallinity, while mercury intrusion porosimetry and compressive strength tests confirmed increased porosity. In addition to being an efficient, time-saving, and solvent-free manner of stopping the reactions in AAMs, microwave irradiation emerged as an innovative, chemical-free method for evaluating curing finalisation and engineering foams in a stage when all other existing methods fail. However, the artificially provoked efflorescence in aged dehydrated AAMs connected the slipperiness of AAM with the instant extraction of Na, which raised the need for further research into alternative alkali replacements to evaluate the practical use of AAM. |
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| Ključne besede: | materials chemistry, alkali-activated materials, geopolymers, slag, fly ash, rock wool, glass wool, metakaolin, microwave irradiation, dehydration, stopping chemical reactions, efflorescence |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Datum objave: | 29.11.2024 |
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| Založnik: | MDPI AG |
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| Leto izida: | 2024 |
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| Št. strani: | str. 1-30 |
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| Številčenje: | Vol. 14, iss. 12, [article no.] 1219 |
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| PID: | 20.500.12556/DiRROS-21107  |
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| UDK: | 54 |
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| ISSN pri članku: | 2075-163X |
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| DOI: | 10.3390/min14121219 |
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| COBISS.SI-ID: | 217643779 |
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| Avtorske pravice: | © 2024 by the authors. |
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| Datum objave v DiRROS: | 23.12.2024 |
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| Število ogledov: | 12 |
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| Število prenosov: | 7 |
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| Metapodatki: |    |
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