| Title: | Influence of microwaves in the early stage of alkali activation on the mechanical strength of alkali-activated materials |
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| Authors: | ID Horvat, Barbara (Author)
ID Pavlin, Majda (Author)
ID Ducman, Vilma (Author) |
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| Files: |  URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S0272884222045461?via%3Dihub
 PDF - Presentation file, download (8,99 MB)
MD5: 8BACCB8511E495DDA1694878EC6727C4
 DOCX - Supplement, download (688,65 KB)
MD5: 6F596005DD1D92CE811446B29FCC4CCC
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | This study focuses on the influence of microwave irradiation dosimetry on alkali-activated slurry in its early stages. The impact on the chemistry and mineralogy along with the mechanical properties were evaluated by changing the power of microwaves and their duration of exposure. This influenced the dissolution of amorphous content, diffusion, and self-assembly into an aluminosilicate network. The precursors used in this study were metakaolin, a non-waste material commonly used in geopolymerisation technology, and local fly ash and ladle furnace slag as secondary materials. Furthermore, they were chemically and mineralogically analysed, and their mixtures with NaOH and Na-water glass provided the optimal ratio of the amount of elements obtained using the pre-calculation approach. However, the potential extra addition of water was experimentally determined to allow complete wetting of the material and solid workability during moulding. Using Fourier-transform infrared spectroscopy, the influence of water was further investigated in alkali-activated slag and fly ash irradiated with microwaves, which resulted in the highest values of mechanical strength in the dosimetry-mapping part of the analysis. In addition to the time dependence of the expected mechanical strength on the ageing of the alkali- activated material, the synthesised material exhibited a significant dependence on the dose of microwave irra- diation, which was different for every precursor as well as every mixture with different chemistries. |
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| Keywords: | odpadni material, alkalijska aktivacija, obsevanje z mikrovalovi, mehanska trdnost, waste material, alkali activation, microwave irradiation, mechanical strength |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 14.12.2023 |
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| Publisher: | Ceramurgica s.p.a. |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 24246-24258 |
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| Numbering: | part B, iss. 14 |
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| PID: | 20.500.12556/DiRROS-16697  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 0272-8842 |
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| DOI: | 10.1016/j.ceramint.2022.12.133 |
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| COBISS.SI-ID: | 134219267 |
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| Copyright: | © 2023 The Authors. Published by Elsevier Ltd |
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| Note: | Available online 14 December 2022;
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| Publication date in DiRROS: | 12.07.2023 |
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| Views: | 722 |
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| Downloads: | 556 |
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