Early age hydration and application of blended magnesium potassium phosphate cements for reduced corrosion of reactive metals

Laura J. Gardner, Claire L. Corkhill, Sam A. Walling, James E. Vigor, Claire A. Murray, Chiu C. Tang, John L. Provis, Neil C. Hyatt*

*Corresponding author for this work

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

40 Citations (Scopus)

Abstract

Magnesium potassium phosphate cements (MKPC) were investigated to determine their efficacy towards retardation of reactive uranium metal corrosion. Optimised low-water content, fly ash (FA) and blast furnace slag (BFS) blended MKPC formulations were developed and their fluidity, hydration behaviour, strength and phase assemblage investigated. In-situ time resolved synchrotron powder X-ray diffraction was used to detail the early age (~60 h) phase assemblage development and hydration kinetics, where the inclusion of BFS was observed to delay the formation of struvite-K by ~14 h compared to FA addition (~2 h). All samples set within this period, suggesting the possible formation of a poorly crystalline binding phase prior to struvite-K crystallisation. Long-term corrosion trials using metallic uranium indicated that MKPC systems are capable of limiting uranium corrosion rates (reduced by half), when compared to a UK nuclear industry grout, which highlights their potential application radioactive waste immobilisation.

Original languageEnglish
Article number106375
JournalCement and Concrete Research
Volume143
DOIs
Publication statusPublished - May 2021

Bibliographical note

Publisher Copyright:
© 2021 The Author(s)

Keywords

  • Calorimetry (A)
  • Chemically bonded ceramics (D)
  • Hydration (A)
  • Radioactive waste (E)
  • X-ray diffraction (B)

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