Vogt, Oliver ; Ukrainczyk, Neven ; Ballschmiede, Conrad ; Koenders, Eddie (2019)
Reactivity and Microstructure of Metakaolin Based Geopolymers: Effect of Fly Ash and Liquid/Solid Contents.
In: Materials, 12 (21)
doi: 10.3390/ma12213485
Article, Bibliographie
This is the latest version of this item.
Abstract
Geopolymers are inorganic binders based on mixtures of an aluminosilicate powder with an alkali-silicate solution. Properties of geopolymers are strongly determined by the type of reactive solid, the liquid/solid ratio of paste and, amongst others, the Si/Al ratio of the formed geopolymer network. In this study, fly ash blended metakaolin based geopolymers with varying liquid/solid ratios (l/s), activated by potassium silicate solution, are investigated. Reactivity of metakaolin and fly ash was investigated by powder X-ray diffraction (XRD) and dissolution tests. Reactivity, mechanical properties and microstructure of hardened pastes were analyzed by setting and compressive strength tests, mercury intrusion porosimetry (MIP), capillary water absorption tests, thermogravimetric analysis-differential scanning calorimeter (TGA-DSC), isothermal calorimetry and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). The results show that substitution of metakaolin by fly ash as well as variation of l/s brings advantages up to a certain degree, but also has a considerable influence on the pore size distribution, mechanical properties, Si/Al ratio of the geopolymer network and the content of bound water.
| Item Type: | Article |
|---|---|
| Erschienen: | 2019 |
| Creators: | Vogt, Oliver ; Ukrainczyk, Neven ; Ballschmiede, Conrad ; Koenders, Eddie |
| Type of entry: | Bibliographie |
| Title: | Reactivity and Microstructure of Metakaolin Based Geopolymers: Effect of Fly Ash and Liquid/Solid Contents |
| Language: | English |
| Date: | 2019 |
| Place of Publication: | Basel |
| Publisher: | MDPI |
| Journal or Publication Title: | Materials |
| Volume of the journal: | 12 |
| Issue Number: | 21 |
| Collation: | 21 Seiten |
| DOI: | 10.3390/ma12213485 |
| Corresponding Links: | |
| Abstract: | Geopolymers are inorganic binders based on mixtures of an aluminosilicate powder with an alkali-silicate solution. Properties of geopolymers are strongly determined by the type of reactive solid, the liquid/solid ratio of paste and, amongst others, the Si/Al ratio of the formed geopolymer network. In this study, fly ash blended metakaolin based geopolymers with varying liquid/solid ratios (l/s), activated by potassium silicate solution, are investigated. Reactivity of metakaolin and fly ash was investigated by powder X-ray diffraction (XRD) and dissolution tests. Reactivity, mechanical properties and microstructure of hardened pastes were analyzed by setting and compressive strength tests, mercury intrusion porosimetry (MIP), capillary water absorption tests, thermogravimetric analysis-differential scanning calorimeter (TGA-DSC), isothermal calorimetry and scanning electron microscopy with energy dispersive spectroscopy (SEM-EDS). The results show that substitution of metakaolin by fly ash as well as variation of l/s brings advantages up to a certain degree, but also has a considerable influence on the pore size distribution, mechanical properties, Si/Al ratio of the geopolymer network and the content of bound water. |
| Uncontrolled Keywords: | geopolymer, metakaolin, fly ash, reactivity, microstructure, Si/Al ratio, MIP, SEM-EDS, TGA-DSC |
| Additional Information: | This article belongs to the Special Issue Sustainability in Construction and Building Materials |
| Classification DDC: | 600 Technology, medicine, applied sciences > 624 Civil engineering and environmental protection engineering 600 Technology, medicine, applied sciences > 660 Chemical engineering |
| 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: | 17 Jan 2024 14:24 |
| Last Modified: | 17 Jan 2024 14:24 |
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Reactivity and Microstructure of Metakaolin Based Geopolymers: Effect of Fly Ash and Liquid/Solid Contents. (deposited 16 Jan 2024 12:35)
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