Diffusion of Cs+ and Cl- through sealing materials

A. Kumar, S. Komarneni, D. M. Roy

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The engineering or sealing materials is an integral part of a repository design system for the disposal by isolation of nuclear wastes in geologic media. Cement, concrete, zeolites and clay minerals are some of the promising candidate borehole plugging or sealing materials. In order to evaluate the efficacy of these sealing materials, Cs+ and Cl- diffusion studies were conducted on thin cured discs or cement and cement admixtures with zeolite or montmorillonite or silica fume or blast furnace slag. The cement admixtures are superior to straight cement in retarding the migration of Cs+ and Cl-. The montmorillonite blended cement performs in an intermediate fashion when compared to the straight cement and zeolite or silica fume bearing cements. The diffusions of Cs+ and Cl- appear to be related to the pore structure as well as the crystal structures of the phases added or subsequently formed during curing. These results tend to suggest that the addition of 10-20% silica fume or zeolite phase to the portland cement may be very advantageous in resisting the migration of Cs+ and, to some extent, Cl- ions across cement pastes.

Original languageEnglish (US)
Pages (from-to)153-160
Number of pages8
JournalCement and Concrete Research
Volume17
Issue number1
DOIs
StatePublished - Jan 1987

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Sealants
Cements
Zeolites
Silica fume
Clay minerals
Bentonite
Bearings (structural)
Radioactive Waste
Portland cement
Pore structure
Ointments
Radioactive wastes
Boreholes
Waste disposal
Slags
Curing
Crystal structure
Concretes
Ions

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Materials Science(all)

Cite this

Kumar, A. ; Komarneni, S. ; Roy, D. M. / Diffusion of Cs+ and Cl- through sealing materials. In: Cement and Concrete Research. 1987 ; Vol. 17, No. 1. pp. 153-160.
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Diffusion of Cs+ and Cl- through sealing materials. / Kumar, A.; Komarneni, S.; Roy, D. M.

In: Cement and Concrete Research, Vol. 17, No. 1, 01.1987, p. 153-160.

Research output: Contribution to journalArticle

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AB - The engineering or sealing materials is an integral part of a repository design system for the disposal by isolation of nuclear wastes in geologic media. Cement, concrete, zeolites and clay minerals are some of the promising candidate borehole plugging or sealing materials. In order to evaluate the efficacy of these sealing materials, Cs+ and Cl- diffusion studies were conducted on thin cured discs or cement and cement admixtures with zeolite or montmorillonite or silica fume or blast furnace slag. The cement admixtures are superior to straight cement in retarding the migration of Cs+ and Cl-. The montmorillonite blended cement performs in an intermediate fashion when compared to the straight cement and zeolite or silica fume bearing cements. The diffusions of Cs+ and Cl- appear to be related to the pore structure as well as the crystal structures of the phases added or subsequently formed during curing. These results tend to suggest that the addition of 10-20% silica fume or zeolite phase to the portland cement may be very advantageous in resisting the migration of Cs+ and, to some extent, Cl- ions across cement pastes.

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