Vogt, Oliver ; Ukrainczyk, Neven ; Koenders, Eddie (2022)
Effect of Silica Fume on Metakaolin Geopolymers’ Sulfuric Acid Resistance.
In: Materials, 14 (18)
doi: 10.3390/ma14185396
Article, Bibliographie
This is the latest version of this item.
Abstract
To demonstrate the importance of the Si/Al ratio in terms of geopolymer mix designs for acid resistance, a metakaolin-based geopolymer was modified by replacing the aforementioned precursor with different percentages of silica fume. Durability tests were performed by exposing geopolymers with varying amounts of silica fume (up to 9%) to sulfuric acid solution (pH 1) over a period of 84 days. Geopolymer samples were analyzed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) before and after 7, 14, 28, 56 and 84 days of exposure. To show the time-dependent change of the elemental composition in the corroded layer after sulfuric acid attack, SEM-EDX elemental mappings were conducted and divided into 100 µm segments to generate element-specific depth profiles. The results show that above a critical silica fume content, the erosion of the sample surface by complete dissolution can be prevented and higher amounts of silica fume lead to a significant densification of large (protective) areas of the corroded layer, which delays the progress of corrosion.
| Item Type: | Article |
|---|---|
| Erschienen: | 2022 |
| Creators: | Vogt, Oliver ; Ukrainczyk, Neven ; Koenders, Eddie |
| Type of entry: | Bibliographie |
| Title: | Effect of Silica Fume on Metakaolin Geopolymers’ Sulfuric Acid Resistance |
| Language: | English |
| Date: | 2022 |
| Publisher: | MDPI |
| Journal or Publication Title: | Materials |
| Volume of the journal: | 14 |
| Issue Number: | 18 |
| Collation: | 26 Seiten |
| DOI: | 10.3390/ma14185396 |
| Corresponding Links: | |
| Abstract: | To demonstrate the importance of the Si/Al ratio in terms of geopolymer mix designs for acid resistance, a metakaolin-based geopolymer was modified by replacing the aforementioned precursor with different percentages of silica fume. Durability tests were performed by exposing geopolymers with varying amounts of silica fume (up to 9%) to sulfuric acid solution (pH 1) over a period of 84 days. Geopolymer samples were analyzed by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) before and after 7, 14, 28, 56 and 84 days of exposure. To show the time-dependent change of the elemental composition in the corroded layer after sulfuric acid attack, SEM-EDX elemental mappings were conducted and divided into 100 µm segments to generate element-specific depth profiles. The results show that above a critical silica fume content, the erosion of the sample surface by complete dissolution can be prevented and higher amounts of silica fume lead to a significant densification of large (protective) areas of the corroded layer, which delays the progress of corrosion. |
| Additional Information: | Keywords: geopolymer; metakaolin; silica fume; sulfuric acid attack; corrosion; durability; SEM-EDX |
| Classification DDC: | 600 Technology, medicine, applied sciences > 600 Technology |
| Divisions: | 13 Department of Civil and Environmental Engineering Sciences 13 Department of Civil and Environmental Engineering Sciences > Institute of Construction and Building Materials |
| Date Deposited: | 02 Aug 2024 12:41 |
| Last Modified: | 02 Aug 2024 12:41 |
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| Suche nach Titel in: | TUfind oder in Google |
Available Versions of this Item
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Effect of Silica Fume on Metakaolin Geopolymers’ Sulfuric Acid Resistance. (deposited 13 May 2022 12:10)
- Effect of Silica Fume on Metakaolin Geopolymers’ Sulfuric Acid Resistance. (deposited 02 Aug 2024 12:41) [Currently Displayed]
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