| Title: | Clay rich river sediments calcined into precursors for alkali activated materials |
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| Authors: | ID Žibret, Lea (Author)
ID Wisniewski, Wolfgang (Author)
ID Horvat, Barbara (Author)
ID Božič, Mojca (Author)
ID Gregorc, Boštjan (Author)
ID Ducman, Vilma (Author) |
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| Files: |  URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S0169131723000352?via%3Dihub
 PDF - Presentation file, download (4,71 MB)
MD5: 7D5D91D89C3FFC67E362AB73FD1A49B5
 DOCX - Supplement, download (7,40 MB)
MD5: 4E4EA5A45A8E861C4AE8E25C7EE29373
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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: | Alkali activated materials (AAMs), a potential alternative to cement-based products or ceramics, can incorporate large amounts of currently landfilled aluminosilicate rich materials such as calcined clay-rich river sediments collected at hydropower plant dams. Untreated fresh sediment and untreated aged sediment intended to serve as AAM precursors were calcined to increase their amorphous content, then activated by Na or K-based silicate or hydroxide solutions and cured at 60 ◦C for three days.
Up to 30 mass % (ma%) of fly ash (FA) or ladle slag (LS) increased the mechanical performance. The phase composition and microstructure are analyzed using X-ray diffraction, fourier-transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and mercury intrusion porosimetry to gain further insight into how the additives influence the final properties of the resulting AAMs. The main crystalline components of the prepared AAMs are quartz, illite/muscovite and feldspar. The amorphous content reaches up to 52.5 ma% in the Na-activated AAMs and up to 48.8 ma% in K-activated AAMs. The acquired results confirm the suitability of the investigated sediments as sole precursors for AAMs. The mechanical properties of the AAMs can be improved by adding FA and/or LS. |
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| Keywords: | sediments, alkali activated materials, properties |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 15.02.2023 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1-10 |
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| Numbering: | Vol. 234, [article no.] 106848 |
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| PID: | 20.500.12556/DiRROS-16325  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 0169-1317 |
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| DOI: | 10.1016/j.clay.2023.106848 |
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| COBISS.SI-ID: | 141839875 |
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| Copyright: | © 2023 The Authors. Published by Elsevier B.V. |
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| Publication date in DiRROS: | 30.05.2023 |
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| Views: | 672 |
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| Downloads: | 559 |
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