Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate
Sodium silicate is commonly used for activating alumina silicates to produce alkali-activated binders that can compete with conventional Portland cement in concrete. However, the cost and emissions related to activators can hinder the use of alkali-activated materials in the industry. The novel, was...
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| Format: | Article |
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MDPI AG
2022-06-01
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| Series: | Crystals |
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| Online Access: | https://www.mdpi.com/2073-4352/12/7/913 |
| _version_ | 1797440127355584512 |
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| author | Dali Bondar Raffaele Vinai |
| author_facet | Dali Bondar Raffaele Vinai |
| author_sort | Dali Bondar |
| collection | DOAJ |
| description | Sodium silicate is commonly used for activating alumina silicates to produce alkali-activated binders that can compete with conventional Portland cement in concrete. However, the cost and emissions related to activators can hinder the use of alkali-activated materials in the industry. The novel, waste-based activators have been developed in the last years, using Si-rich waste streams. Processing waste glass cullet not only reduces the glass landfill disposal but also allows the production of sodium silicate for alkali activation. In this article, the chemical and microstructural properties of neat fly ash and blended 60 fly ash/40 slag pastes activated by sodium silicate produced from glass cullet were studied and compared to equivalent ones activated by commercially available sodium silicate and sodium hydroxide solutions. Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX) were used to determine the microstructure and composition of the gel phase. Findings have confirmed that pastes activated by the processed waste glass showed chemical and microstructural properties comparable to pastes produced with commercially available activators. |
| first_indexed | 2024-03-09T12:03:38Z |
| format | Article |
| id | doaj.art-5f706f5ce5cf4dab92963e8536f2dc86 |
| institution | Directory Open Access Journal |
| issn | 2073-4352 |
| language | English |
| last_indexed | 2024-03-09T12:03:38Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Crystals |
| spelling | doaj.art-5f706f5ce5cf4dab92963e8536f2dc862023-11-30T23:01:10ZengMDPI AGCrystals2073-43522022-06-0112791310.3390/cryst12070913Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium SilicateDali Bondar0Raffaele Vinai1Material Evolution Ltd., Materials Processing Institute, Middlesbrough TS6 6US, UKCollege of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter EX4 4QF, UKSodium silicate is commonly used for activating alumina silicates to produce alkali-activated binders that can compete with conventional Portland cement in concrete. However, the cost and emissions related to activators can hinder the use of alkali-activated materials in the industry. The novel, waste-based activators have been developed in the last years, using Si-rich waste streams. Processing waste glass cullet not only reduces the glass landfill disposal but also allows the production of sodium silicate for alkali activation. In this article, the chemical and microstructural properties of neat fly ash and blended 60 fly ash/40 slag pastes activated by sodium silicate produced from glass cullet were studied and compared to equivalent ones activated by commercially available sodium silicate and sodium hydroxide solutions. Fourier transform infrared (FTIR) spectroscopy, X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray (EDX) were used to determine the microstructure and composition of the gel phase. Findings have confirmed that pastes activated by the processed waste glass showed chemical and microstructural properties comparable to pastes produced with commercially available activators.https://www.mdpi.com/2073-4352/12/7/913alkali activated fly ash and fly ash/slagwaste glasssodium silicatemicrostructural propertiesfourier transform infrared (FTIR) spectroscopyX-ray powder diffraction (XRD) |
| spellingShingle | Dali Bondar Raffaele Vinai Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate Crystals alkali activated fly ash and fly ash/slag waste glass sodium silicate microstructural properties fourier transform infrared (FTIR) spectroscopy X-ray powder diffraction (XRD) |
| title | Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate |
| title_full | Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate |
| title_fullStr | Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate |
| title_full_unstemmed | Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate |
| title_short | Chemical and Microstructural Properties of Fly Ash and Fly Ash/Slag Activated by Waste Glass-Derived Sodium Silicate |
| title_sort | chemical and microstructural properties of fly ash and fly ash slag activated by waste glass derived sodium silicate |
| topic | alkali activated fly ash and fly ash/slag waste glass sodium silicate microstructural properties fourier transform infrared (FTIR) spectroscopy X-ray powder diffraction (XRD) |
| url | https://www.mdpi.com/2073-4352/12/7/913 |
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