Characterisation of a high pH cement backfill for the geological disposal of nuclear waste: the Nirex Reference Vault Backfill

Rita G. W. Vasconcelos, Nicolas Beaudoin, Andrea Hamilton, Neil C. Hyatt, John L. Provis, Claire L. Corkhill

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

In a conceptual UK geological disposal facility for nuclear waste within a high-strength, crystalline geology, a cement-based backfill material, known as Nirex Reference Vault Backfill (NRVB), will be used to provide a chemical barrier to radionuclide release. The NRVB is required to have specific properties to fulfil the operational requirements of the geological disposal facility (GDF); these are dependent on the chemical and physical properties of the cement constituent materials and also on the water content. With the passage of time, the raw materials eventually used to synthesise the backfill may not be the same as those used to formulate it. As such, there is a requirement to understand how NRVB performance may be affected by a change in raw material supply. In this paper, we present a review of the current knowledge of NRVB and results from a detailed characterisation of this material, comparing the differences in performance of the final product when different raw materials are used. Results showed that minor differences in the particle size, surface area and chemical composition of the raw material had an effect on the workability, compressive strength, the rate of hydration and the porosity, which may influence some of the design functions of NRVB. This study outlines the requirement to fully characterise cement backfill raw materials prior to use in a geological disposal facility and supports ongoing assessment of long-term post-closure safety.
LanguageEnglish
Pages180-189
Number of pages10
JournalApplied Geochemistry
Volume89
Early online date15 Nov 2017
DOIs
Publication statusPublished - 28 Feb 2018

Fingerprint

Radioactive Waste
backfill
Radioactive wastes
Waste disposal
radioactive waste
Raw materials
Cements
cement
Geology
Radioisotopes
Hydration
Chemical properties
Water content
Compressive strength
Physical properties
Porosity
Particle size
Crystalline materials
hydration
compressive strength

Keywords

  • geological disposal
  • nuclear waste
  • cement
  • mineralogy
  • microstructure

Cite this

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title = "Characterisation of a high pH cement backfill for the geological disposal of nuclear waste: the Nirex Reference Vault Backfill",
abstract = "In a conceptual UK geological disposal facility for nuclear waste within a high-strength, crystalline geology, a cement-based backfill material, known as Nirex Reference Vault Backfill (NRVB), will be used to provide a chemical barrier to radionuclide release. The NRVB is required to have specific properties to fulfil the operational requirements of the geological disposal facility (GDF); these are dependent on the chemical and physical properties of the cement constituent materials and also on the water content. With the passage of time, the raw materials eventually used to synthesise the backfill may not be the same as those used to formulate it. As such, there is a requirement to understand how NRVB performance may be affected by a change in raw material supply. In this paper, we present a review of the current knowledge of NRVB and results from a detailed characterisation of this material, comparing the differences in performance of the final product when different raw materials are used. Results showed that minor differences in the particle size, surface area and chemical composition of the raw material had an effect on the workability, compressive strength, the rate of hydration and the porosity, which may influence some of the design functions of NRVB. This study outlines the requirement to fully characterise cement backfill raw materials prior to use in a geological disposal facility and supports ongoing assessment of long-term post-closure safety.",
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Characterisation of a high pH cement backfill for the geological disposal of nuclear waste : the Nirex Reference Vault Backfill. / Vasconcelos, Rita G. W.; Beaudoin, Nicolas; Hamilton, Andrea; Hyatt, Neil C.; Provis, John L.; Corkhill, Claire L.

In: Applied Geochemistry, Vol. 89, 28.02.2018, p. 180-189.

Research output: Contribution to journalArticle

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