Production of nepheline/quartz ceramics from geopolymer mortars
By Carsten Kuenzel, L. Grover, L. Vandeperre, Aldo R. Boccaccini, Chris Cheeseman. 2013
152 citations recorded by the source corpus.
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 (NaAlSiO4) and carnegieite (NaAlSiO4) 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 (∼275 MPa) 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.
Subfields: Building and Construction, Civil and Structural Engineering, Earth-Surface Processes
View Paper: https://www.semanticscholar.org/paper/a0d43a049f52e540085325bb4995a7ee58b77959
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Citations in the corpus
- Mechanical, thermal insulation, thermal resistance and acoustic absorption properties of geopolymer foam concrete (2015, background): “When exposed to 800 °C for 3 h, some of the amorphous phases in F5S0 crystallize into nepheline (NaAlSiO 4), which is often found in heated geopolymers [34, 46, 47].”
- Formation of one-part-mixing geopolymers and geopolymer ceramics from geopolymer powder (2017, unknown): “The flexural strength was higher compared to the as-cured geopolymer mortars (10 – 20 MPa) sintered up to 1000°C [60].”