Characteristic evaluation of colloidal silica grout material developed<BR>for a high level radioactive waste geological repository
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- KISHI Hirokazu
- Japan Atomic Energy Agency
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- KAWAGUCHI Masanao
- Japan Atomic Energy Agency
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- NAITO Morimasa
- Japan Atomic Energy Agency
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- HATANAKA Koichiro
- Japan Atomic Energy Agency
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- NOBUTO Jun
- Shimizu Corporation
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- SUGIYAMA Hirokazu
- Shimizu Corporation
Bibliographic Information
- Other Title
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- 高レベル放射性廃棄物地層処分場への適用に向けたコロイダルシリカグラウトの特性評価
- Characteristic evaluation of colloidal silica grout material developed for a high level radioactive waste geological repository
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Abstract
A "Colloidal Silica Grout" (CSG) material has been developed as an alternative grouting material for the geological repository of high level radioactive waste. Two main advantages of the CSG are its smaller particle size distribution (< 50 nm) than those of the cementitious materials, and low pH so as to reduce unfavorable effects on the long-term performance assessment of geological disposal system. The CSG is a composed of a mixture of "colloidal silica solution" and KCl as hardening accelerator. The mixture being investigated for grouting materials was focused on SiO2concentration, grain size and degree of modified surface of silica. Preliminary laboratory experiments were carried out to characterize its fundamental properties from the viewpoint of viscosity, dimensions stability, compressive strength, pressure resistivity and leaching rate of silica. The experiments demonstrate that CSG is expected to become an alternative grouting material for a geological repository.
Journal
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- Journal of Nuclear Fuel Cycle and Environment
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Journal of Nuclear Fuel Cycle and Environment 19 (1), 3-8, 2012
Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan
