| Title: | The effect of crystalline waterproofing a dmixtures on the self-healing and permeability of concrete |
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| Authors: | ID Gojević, Anita (Author)
ID Ducman, Vilma (Author)
ID Netinger Grubeša, Ivanka (Author)
ID Baričević, Ana (Author)
ID Banjad Pečur, Ivana (Author) |
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| Files: |  URL - Source URL, visit https://www.mdpi.com/1996-1944/14/8/1860
Description: Open access
 PDF - Presentation file, download (4,84 MB)
MD5: D483B518AAECE2A61590C15027B273BA
PDF - Supplement, download (195,75 KB)
MD5: BE646697841692430FD8E4A0509892F6
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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 paper investigates the effectiveness of a specific crystalline waterproofing admixture (CWA) in concrete as a function of a water–binder ratio. Four concrete mixes with and without CWA were prepared; two of them with a water–binder ratio of 0.45 and two of them with a water– binder ratio of 0.55. Water permeability and compressive strength were tested on hardened concrete specimens and self-healing of cracks over time was observed. Cement paste and CWA paste were prepared to clarify the results obtained on the concrete specimens. SEM and EDS and XRD and FTIR were performed on the hardened pastes to explain the mechanism of CWA working. The results show that the addition of CWA had no significant effect on the compressive strength of the concrete, but reduced the water penetration depth in the concrete, and the reduction was more effective for mixes with lower water–binder ratio. Regarding the self-healing effect, it can be concluded that the addition of CWA improves the crack healing in concrete, but the efficiency of self-healing is highly dependent on the initial crack width. The mechanisms involved in the reduction of water penetration depth and crack healing in concrete can be explained by different mechanisms; one is creation of the CSH gel from unreacted clinker grains, then formation carbonate, and additional mechanism is gel formation (highly expansive Mg-rich hydro-carbonate) from magnesium based additives. The presence of sodium silicate, which would transform into carbonate/bicarbonate, also cannot be excluded. |
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| Keywords: | slag, self healing concrete, crystal admixture, microstructural analysis |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 09.04.2021 |
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| Publisher: | Molecular Diversity Preservation International |
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| Year of publishing: | 2021 |
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| Number of pages: | str. 1-14 |
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| Numbering: | Vol. 14, iss. 8 |
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| PID: | 20.500.12556/DiRROS-15867  |
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| UDC: | 620.1/2 |
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| ISSN on article: | 1996-1944 |
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| DOI: | 10.3390/ma14081860 |
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| COBISS.SI-ID: | 59413251 |
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| Copyright: | © 2021 by the authors. Licensee MDPI, Basel, Switzerland. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 143 4. 2021;
Št. članka 1860;
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| Publication date in DiRROS: | 03.07.2023 |
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| Views: | 635 |
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| Downloads: | 434 |
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