Characteristic evaluation of colloidal silica grout material developed for a high level radioactive waste geological repository

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, a...

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Bibliographic Details
Published inJournal of Nuclear Fuel Cycle and Environment Vol. 19; no. 1; pp. 3 - 8
Main Authors KISHI, Hirokazu, KAWAGUCHI, Masanao, NAITO, Morimasa, HATANAKA, Koichiro, NOBUTO, Jun, SUGIYAMA, Hirokazu
Format Journal Article
LanguageEnglish
Published Division of Nuclear Fuel Cycle and Environment, Atomic Energy Society of Japan 01.12.2012
Subjects
colloidal silica
geological disposal
grouting
high level radioactive waste repository
leaching
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Summary: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.
ISSN:1884-7579
2186-7135
DOI:10.3327/jnuce.19.3