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A technique to delay hydration and maturation of borehole seals of expansive clay
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6851-4839
2011 (English)In: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917, Vol. 121, no 1-2, p. 1-6Article in journal (Refereed) Published
Abstract [en]

Sealing of deep boreholes for site selection of repositories for high-level radioactive waste can be made by inserting perforated copper tubes containing strongly compacted smectite-rich clay. The clay expands out through the perforation holes and ultimately forms a tight "skin" around the tubes at a rate that depends on the perforation geometry and the chemical composition of the water. The placement of the seals implies that they are moved through water in the borehole which can cause erosion and loss of clay if the expansion of the clay is too fast. The paper describes a method that retards the hydration and expansion of the clay sufficiently much to complete the installation before significant loss of clay has taken place. It involves addition of fine-powdered talc to the smectite grains in preparing a coating of the tubes

Place, publisher, year, edition, pages
2011. Vol. 121, no 1-2, p. 1-6
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-5141DOI: 10.1016/j.enggeo.2011.04.017ISI: 000292943100001Scopus ID: 2-s2.0-79959195261Local ID: 32ac457b-efcf-4575-b857-c0e21204d0e4OAI: oai:DiVA.org:ltu-5141DiVA, id: diva2:978015
Note
Validerad; 2011; 20110526 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Pusch, Roland

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