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Borehole seals of expandable clay with desired water content by use of “dry water”
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-2845-4536
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
2017 (English)In: Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul 2017, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Dense clay can be used for sealing of boreholes and isolation of waste containers. Expansion of the clay to fill the space between containers and confining rock takes place by uptake of water of the clay, which thereby provides effective isolation. The issue is to prepare clay inserts with properly selected water content. The paper describes preparation of clay seals by mixing air-dry clay powder with nanoparticles of water droplets coated with very thin shells of a hydrophobic silicious substance (“dry water”). It behaves as dry powder and is easily mixed with dry clay. On compaction to the desired density the shells break into microscopic fragments while water becomes homogeneously distributed in the mass. Laboratory tests verify that the properties of clay prepared in this way are the same, or better, than of commonly saturated clay.

Abstract [fr]

On peut utiliser de l'argile dense pour sceller les forages et isoler les conteneurs de déchets. L'expansion de l'argile pourremplir l'espace entre les récipients et la roche confinant a lieu par absorption d'eau de l'argile, ce qui fournit ainsi un isolement efficace. La question est de préparer des inserts d'argile avec une teneur en eau correctement sélectionnée. L'article décrit la préparation de joints d'argile en mélangeant de la poudre d'argile séchée à l'air avec des nanoparticules de gouttelettes d'eau revêtues de coquilles très minces d'une substance siliceuse hydrophobe ("eau sèche"). Il se comporte comme une poudre sèche et se mélange facilement avec de l'argile sèche. Lors du compactage à la densité souhaitée, les coquilles se cassent en fragments microscopiques tandis que l'eau se répartit de manière homogène dans la masse. Des essais en laboratoire vérifient que les propriétés de l'argile préparée de cette façon sont les mêmes, ou mieux, que les argiles couramment saturées.

Place, publisher, year, edition, pages
2017.
Keyword [en]
borehole sealing, clay blocks, degree of saturation, density, “dry water”, water content
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-64920OAI: oai:DiVA.org:ltu-64920DiVA: diva2:1128824
Conference
19th International Conference on Soil Mechanics and Geotechnical Engineering, Coex, Seoul, Korea, 17~22 September 2017
Available from: 2017-07-29 Created: 2017-07-29 Last updated: 2017-11-24Bibliographically approved

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