Bentonite buffer blocks manufactured by isostatic compression

Heidar Gharbieh, Edgar Bohner, Keijo Haapala, Liisa Salparanta

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Isostatic compression is a technically highly specialised technology for manufacturing solid components from powder. There are only few reported experiences for isostatic compression of bentonite clay, which forms the basis of the engineered barrier system in the geological disposal concept KBS-3V, currently under investigation in Sweden and Finland. An isostatically compressed middle-scale MX-80 bentonite ring block (approximately 2/3 of full-scale diameter) was examined with regard to its dimensions, shape and surface texture. The physical and mechanical characteristics of the middle-scale ring block were analysed. The measured results were compared to previously obtained data from other isostatically compacted disc and ring blocks of similar scale, as well as to a full-scale ring block also manufactured by isostatic compression. Irrespective of the different manufacturing conditions, a consistent homogeneity among the middle-scale blocks and between the middle and full-scale blocks was determined. Results show that isostatic compression is a feasible manufacturing method that meets the high technical standards demanded in nuclear waste management.
Original languageEnglish
JournalEnvironmental Geotechnics
DOIs
Publication statusE-pub ahead of print - 13 Apr 2018
MoE publication typeNot Eligible

Fingerprint

Bentonite
bentonite
Buffers
compression
manufacturing
Radioactive Waste
Waste management
Radioactive wastes
Powders
Clay
Textures
radioactive waste
homogeneity
waste management
texture
clay

Keywords

  • cut-off walls & barriers; radioactive waste disposal; strength & testing of materials

Cite this

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title = "Bentonite buffer blocks manufactured by isostatic compression",
abstract = "Isostatic compression is a technically highly specialised technology for manufacturing solid components from powder. There are only few reported experiences for isostatic compression of bentonite clay, which forms the basis of the engineered barrier system in the geological disposal concept KBS-3V, currently under investigation in Sweden and Finland. An isostatically compressed middle-scale MX-80 bentonite ring block (approximately 2/3 of full-scale diameter) was examined with regard to its dimensions, shape and surface texture. The physical and mechanical characteristics of the middle-scale ring block were analysed. The measured results were compared to previously obtained data from other isostatically compacted disc and ring blocks of similar scale, as well as to a full-scale ring block also manufactured by isostatic compression. Irrespective of the different manufacturing conditions, a consistent homogeneity among the middle-scale blocks and between the middle and full-scale blocks was determined. Results show that isostatic compression is a feasible manufacturing method that meets the high technical standards demanded in nuclear waste management.",
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author = "Heidar Gharbieh and Edgar Bohner and Keijo Haapala and Liisa Salparanta",
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Bentonite buffer blocks manufactured by isostatic compression. / Gharbieh, Heidar; Bohner, Edgar; Haapala, Keijo; Salparanta, Liisa.

In: Environmental Geotechnics, 13.04.2018.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Bentonite buffer blocks manufactured by isostatic compression

AU - Gharbieh, Heidar

AU - Bohner, Edgar

AU - Haapala, Keijo

AU - Salparanta, Liisa

PY - 2018/4/13

Y1 - 2018/4/13

N2 - Isostatic compression is a technically highly specialised technology for manufacturing solid components from powder. There are only few reported experiences for isostatic compression of bentonite clay, which forms the basis of the engineered barrier system in the geological disposal concept KBS-3V, currently under investigation in Sweden and Finland. An isostatically compressed middle-scale MX-80 bentonite ring block (approximately 2/3 of full-scale diameter) was examined with regard to its dimensions, shape and surface texture. The physical and mechanical characteristics of the middle-scale ring block were analysed. The measured results were compared to previously obtained data from other isostatically compacted disc and ring blocks of similar scale, as well as to a full-scale ring block also manufactured by isostatic compression. Irrespective of the different manufacturing conditions, a consistent homogeneity among the middle-scale blocks and between the middle and full-scale blocks was determined. Results show that isostatic compression is a feasible manufacturing method that meets the high technical standards demanded in nuclear waste management.

AB - Isostatic compression is a technically highly specialised technology for manufacturing solid components from powder. There are only few reported experiences for isostatic compression of bentonite clay, which forms the basis of the engineered barrier system in the geological disposal concept KBS-3V, currently under investigation in Sweden and Finland. An isostatically compressed middle-scale MX-80 bentonite ring block (approximately 2/3 of full-scale diameter) was examined with regard to its dimensions, shape and surface texture. The physical and mechanical characteristics of the middle-scale ring block were analysed. The measured results were compared to previously obtained data from other isostatically compacted disc and ring blocks of similar scale, as well as to a full-scale ring block also manufactured by isostatic compression. Irrespective of the different manufacturing conditions, a consistent homogeneity among the middle-scale blocks and between the middle and full-scale blocks was determined. Results show that isostatic compression is a feasible manufacturing method that meets the high technical standards demanded in nuclear waste management.

KW - cut-off walls & barriers; radioactive waste disposal; strength & testing of materials

U2 - 10.1680/jenge.17.00080

DO - 10.1680/jenge.17.00080

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JO - Environmental Geotechnics

JF - Environmental Geotechnics

SN - 2051-803X

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