Amorphous self-glazed, chopped basalt fiber reinforced, geopolymer-based composites

Vimanyu Chadha, Waltraud M. Kriven

Research output: Contribution to journalArticlepeer-review

Abstract

Geopolymer composites reinforced with refractory, chopped basalt fibers, and low melting glass were fabricated and heat treated at higher temperatures. K2O·Al2O3·4SiO2·11H2O was the stoichiometric composition of the potassium-based geopolymer which was produced from water glass (fumed silica, deionized water, potassium hydroxide), and metakaolin. Addition of low melting glass (Tm ~815°C) increased the flexure strength of the composites to ~5 MPa after heat treatment above 1000°C to 1200°C. A Weibull statistical analysis was performed exhibiting how the amorphous self-healing and self-glazing effect of the glass frit significantly improved the flexure strength of the geopolymer and ceramic composites after exposure for 1 hour to high temperatures. At 950-1000°C, the K-based geopolymer converted to primarily a crystalline leucite ceramic, but the basalt fiber remained intact, and the melted glass frit flowed out of the surface cracks and sealed them. 1150℃ was determined to be the optimum heat treatment temperature, as at ≤1200°C, the basalt fibers melt and the strength of the reinforcement in the composites is significantly reduced. The amorphous self-healing and amorphous self-glazing effects of the glass frit significantly improved the room temperature flexure strength of the heat-treated geopolymer and ceramic composites.

Original languageEnglish (US)
Pages (from-to)1097-1105
Number of pages9
JournalInternational Journal of Applied Ceramic Technology
Volume18
Issue number4
DOIs
StateAccepted/In press - 2021

Keywords

  • amorphous self-glazed composites
  • amorphous self-healed composites
  • flexural strength
  • high temperature
  • metakaolin-based geopolymers
  • Weibull statistics

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Marketing
  • Materials Chemistry

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