Production of nepheline/quartz ceramics from geopolymer mortars

Research output: Contribution to journalArticlepeer-review

Authors

  • C. Kuenzel
  • Liam Grover
  • L. Vandeperre
  • A. R. Boccaccini
  • C. R. Cheeseman

Colleges, School and Institutes

External organisations

  • Imperial College London
  • Friedrich-Alexander-Universität Erlangen-Nürnberg

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.

Details

Original languageEnglish
Pages (from-to)251-258
Number of pages8
JournalJournal of the European Ceramic Society
Volume33
Issue number2
Publication statusPublished - 1 Feb 2013

Keywords

  • A. Sintering, C. Mechanical properties, Ceramic, Final microstructure, Geopolymer