Abstract
This research has investigated the mechanical properties and microstructure of metakaolin derived geopolymer mortars containing 50% by weight of silica sand, after exposure to temperatures up to 1200°C. The compressive strength, porosity and microstructure of the geopolymer mortar samples were not significantly affected by temperatures up to 800°C. Nepheline (NaAlSiO 4) and carnegieite (NaAlSiO 4) form at 900°C in the geopolymer phase and after exposure to 1000°C the mortar samples were transformed into polycrystalline nepheline/quartz ceramics with relatively high compressive strength (∼275MPa) and high Vickers hardness (∼350 HV). Between 1000 and 1200°C the samples soften with gas evolution causing the formation of closed porosity that reduced sample density and limited the mechanical properties.
Original language | English |
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Pages (from-to) | 251-258 |
Number of pages | 8 |
Journal | Journal of the European Ceramic Society |
Volume | 33 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1 Feb 2013 |
Keywords
- A. Sintering
- C. Mechanical properties
- Ceramic
- Final microstructure
- Geopolymer
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry