Bentonite buffer blocks manufactured by isostatic compression

Heidar Gharbieh, Edgar Bohner, Keijo Haapala, Liisa Salparanta

    Research output: Contribution to journalArticleScientificpeer-review

    1 Citation (Scopus)

    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
    Pages (from-to)99-109
    Number of pages11
    JournalEnvironmental Geotechnics
    Volume7
    Issue number2
    Early online date13 Apr 2018
    DOIs
    Publication statusPublished - 7 Apr 2020
    MoE publication typeNot Eligible

    Keywords

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

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