Influence of sample preparation on MX-80 bentonite microstructure

Michal Matusewicz, Veli-Matti Pulkkanen, Markus Olin

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)

    Abstract

    Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.
    Original languageEnglish
    Pages (from-to)189-195
    JournalClay Minerals
    Volume51
    Issue number2
    DOIs
    Publication statusPublished - 2016
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Bentonite
    sample preparation
    bentonite
    microstructure
    Microstructure
    repository
    Radioactive Waste
    dry density
    X ray scattering
    radioactive waste
    bulk density
    Materials properties
    bedrock
    Buffers
    experiment
    Experiments
    scattering
    clay
    Water

    Keywords

    • MX-80
    • bentonite
    • buffer
    • microstructure
    • repository conditions
    • small-angle X-ray scatterin

    Cite this

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    title = "Influence of sample preparation on MX-80 bentonite microstructure",
    abstract = "Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.",
    keywords = "MX-80, bentonite, buffer, microstructure, repository conditions, small-angle X-ray scatterin",
    author = "Michal Matusewicz and Veli-Matti Pulkkanen and Markus Olin",
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    year = "2016",
    doi = "10.1180/claymin.2015.051.2.06",
    language = "English",
    volume = "51",
    pages = "189--195",
    journal = "Clay Minerals",
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    Influence of sample preparation on MX-80 bentonite microstructure. / Matusewicz, Michal; Pulkkanen, Veli-Matti; Olin, Markus.

    In: Clay Minerals, Vol. 51, No. 2, 2016, p. 189-195.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Influence of sample preparation on MX-80 bentonite microstructure

    AU - Matusewicz, Michal

    AU - Pulkkanen, Veli-Matti

    AU - Olin, Markus

    N1 - Project code: 100411

    PY - 2016

    Y1 - 2016

    N2 - Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.

    AB - Compacted bentonite is to be used as a buffer material between waste canisters and the bedrock in the deep geological disposal of high-level nuclear waste in several countries. In spite of the fact that such large bentonite systems have long equilibration times, estimation of the material properties and performance in repository conditions is often based on short-term, laboratory-scale experiments. Sample-preparation procedures in these experiments may differ from the natural evolution of the bentonite in the repository, however, affecting the bentonite properties. The present study reports the influence on the structure of clay tactoids of four different preparation procedures of water-saturated, compacted MX-80 bentonite samples using four target dry bulk densities. Small-angle X-ray scattering was used to illustrate the differences between the samples. The different treatments of the bentonite samples may lead to different structural features. Clear differences between low-density samples prepared using different procedures were observed. The influence of the preparation methods was less, but still noticeable, for the high-density samples.

    KW - MX-80

    KW - bentonite

    KW - buffer

    KW - microstructure

    KW - repository conditions

    KW - small-angle X-ray scatterin

    U2 - 10.1180/claymin.2015.051.2.06

    DO - 10.1180/claymin.2015.051.2.06

    M3 - Article

    VL - 51

    SP - 189

    EP - 195

    JO - Clay Minerals

    JF - Clay Minerals

    SN - 0009-8558

    IS - 2

    ER -