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Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste
Bentonite-based geomaterials are included in the designs of geological repository planning in most countries, especially in high-level radioactive waste disposal. Physical integrity of the bentonite sealant is key in assuring its hydraulic and retention properties, which affect the long-term perform...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Berlin Heidelberg
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7524814/ https://www.ncbi.nlm.nih.gov/pubmed/32124284 http://dx.doi.org/10.1007/s11356-020-08151-2 |
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author | Reijonen, Heini Maria Kuva, Jukka Heikkilä, Pasi |
author_facet | Reijonen, Heini Maria Kuva, Jukka Heikkilä, Pasi |
author_sort | Reijonen, Heini Maria |
collection | PubMed |
description | Bentonite-based geomaterials are included in the designs of geological repository planning in most countries, especially in high-level radioactive waste disposal. Physical integrity of the bentonite sealant is key in assuring its hydraulic and retention properties, which affect the long-term performance of the repositories. Examination of the internal textures and structures of bentonite has been challenging until recently. Here, X-ray computed tomography (XCT) is applied to improve the textural and structural characterization of natural and man-made bentonite samples. Based on these initial analyses, clear benefits have been identified compared with conventional bentonite research methods. First, applying XCT prior to destructive analytical methods provides means to distinguish secondary features or in situ textures. It allows to eliminate false interpretations due to sample deformation and guides subsampling. Second, XCT images add the third dimension to analyses, allowing larger spatial coverage in less time. Overall, findings support the application of XCT for reducing uncertainties related to physical characterization of bentonite samples, both natural and industrial. They also show that XCT has potential to be developed to support quality assurance processes for bentonite sealant manufacturing. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11356-020-08151-2) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-7524814 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Springer Berlin Heidelberg |
record_format | MEDLINE/PubMed |
spelling | pubmed-75248142020-10-14 Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste Reijonen, Heini Maria Kuva, Jukka Heikkilä, Pasi Environ Sci Pollut Res Int Clay and Modified Clays in Remediating Environmental Pollutants Bentonite-based geomaterials are included in the designs of geological repository planning in most countries, especially in high-level radioactive waste disposal. Physical integrity of the bentonite sealant is key in assuring its hydraulic and retention properties, which affect the long-term performance of the repositories. Examination of the internal textures and structures of bentonite has been challenging until recently. Here, X-ray computed tomography (XCT) is applied to improve the textural and structural characterization of natural and man-made bentonite samples. Based on these initial analyses, clear benefits have been identified compared with conventional bentonite research methods. First, applying XCT prior to destructive analytical methods provides means to distinguish secondary features or in situ textures. It allows to eliminate false interpretations due to sample deformation and guides subsampling. Second, XCT images add the third dimension to analyses, allowing larger spatial coverage in less time. Overall, findings support the application of XCT for reducing uncertainties related to physical characterization of bentonite samples, both natural and industrial. They also show that XCT has potential to be developed to support quality assurance processes for bentonite sealant manufacturing. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (10.1007/s11356-020-08151-2) contains supplementary material, which is available to authorized users. Springer Berlin Heidelberg 2020-03-02 2020 /pmc/articles/PMC7524814/ /pubmed/32124284 http://dx.doi.org/10.1007/s11356-020-08151-2 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Clay and Modified Clays in Remediating Environmental Pollutants Reijonen, Heini Maria Kuva, Jukka Heikkilä, Pasi Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste |
title | Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste |
title_full | Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste |
title_fullStr | Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste |
title_full_unstemmed | Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste |
title_short | Benefits of applying X-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste |
title_sort | benefits of applying x-ray computed tomography in bentonite based material research focussed on geological disposal of radioactive waste |
topic | Clay and Modified Clays in Remediating Environmental Pollutants |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7524814/ https://www.ncbi.nlm.nih.gov/pubmed/32124284 http://dx.doi.org/10.1007/s11356-020-08151-2 |
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