Development and demonstration of concrete for investigative deep borehole sealing at Olkiluoto nuclear repository site

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Flowable low-pH concrete was developed and demonstrated for closure of site investigation boreholes. The boreholes have been used during geological characterization of the nuclear spent fuel disposal site at Olkiluoto, Finland. Posiva Oy has over 60 deep cored boreholes of varying diameter (typically 56 to 76 mm) and at lengths from 200 to 1200 metres deep. Two holes were sealed in 2016 using materials developed in VTT's laboratories. The low-pH concrete needed to have high workability for casting emplacement to a 1000 metre deep hole and high long-term durability with low hydraulic conductivity. The results are being used for license applications to Radiation and Nuclear Safety Authority of Finland, to show compliance with repository safety.
    Original languageEnglish
    Title of host publicationNordic Concrete Research
    Subtitle of host publicationProceedings of the XXIII Nordic Concrete Research Symposium, Aalborg, Denmark 2017
    ChapterB8
    Pages369-372
    ISBN (Electronic)978-82-8208-056-9
    Publication statusPublished - 2017
    MoE publication typeA4 Article in a conference publication
    EventXXIII Nordic Concrete Research Symposium - Aalborg, Denmark
    Duration: 21 Aug 201723 Aug 2017

    Publication series

    SeriesNordic Concrete Research
    ISSN0800-6377

    Conference

    ConferenceXXIII Nordic Concrete Research Symposium
    CountryDenmark
    CityAalborg
    Period21/08/1723/08/17

    Keywords

    • mix design
    • SCC
    • execution
    • nuclear
    • supplementary cementitious materials
    • repository

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