Evolution of phase assemblage of blended magnesium potassium phosphate cement binders at 200 and 1000°C

L. J. Gardner, V. Lejeune, C. L. Corkhill, S. A. Bernal, J. L. Provis, M. C. Stennett, N. C. Hyatt*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

30 Citations (Scopus)

Abstract

The fire performance of magnesium potassium phosphate cement (MKPC) binders blended with fly ash (FA) and ground granulated blast furnace slag (GBFS) was investigated up to 1000°C using X-ray diffraction, thermogravimetric analysis and SEM techniques. The FA/MKPC and GBFS/MKPC binders dehydrate above 200°C to form amorphous KMgPO4, concurrent with volumetric and mass changes. Above 1000°C, additional crystalline phases were formed and microstructural changes occurred, although no cracking or spalling of the samples was observed. These results indicate that FA/MKPC and GBFS/MKPC binders are expected to have satisfactory fire performance under the fire scenario conditions relevant to the operation of a UK or other geological disposal facility.

Original languageEnglish
Pages (from-to)386-392
Number of pages7
JournalAdvances in Applied Ceramics
Volume114
Issue number7
DOIs
Publication statusPublished - Oct 2015

Bibliographical note

Publisher Copyright:
© 2015 Institute of Materials, Minerals and Mining.

Keywords

  • Fire performance
  • Fly ash
  • Ground granulated blast furnace slag
  • MKPC
  • Nuclear waste

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