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Early age hydration and application of blended magnesium potassium phosphate cements for reduced corrosion of reactive metals
DOI:
10.1016/j.cemconres.2021.106375
Authors:
Laura J.
Gardner
(University of Sheffield)
,
Claire L.
Corkhill
(University of Sheffield)
,
Sam A.
Walling
(University of Sheffield)
,
James E.
Vigor
(University of Sheffield)
,
Claire A.
Murray
(Diamond Light Source)
,
Chiu C.
Tang
(Diamond Light Source)
,
John L.
Provis
(University of Sheffield)
,
Neil C.
Hyatt
(University of Sheffield)
Co-authored by industrial partner:
No
Type:
Journal Paper
Journal:
Cement And Concrete Research
, VOL 143
State:
Published (Approved)
Published:
May 2021
Diamond Proposal Number(s):
10038

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.
Journal Keywords: Chemically bonded ceramics; Calorimetry; Hydration; X-ray diffraction; Radioactive waste
Subject Areas:
Materials,
Chemistry
Instruments:
I11-High Resolution Powder Diffraction
Discipline Tags:
Earth Sciences & Environment
Nuclear Waste
Material Sciences
Radioactive Materials
Chemistry
Technical Tags:
Diffraction
X-ray Powder Diffraction