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Development of Superfine Spherical Silica Grout as an Alternative Grouting Material for the Geological Disposal of Long-Lived Radioactive Waste

[+] Author Affiliations
Morimasa Naito, Hirokazu Kishi, Naomi Fukuoka

Japan Atomic Energy Agency, Tokai, Ibaraki, Japan

Tsutomu Yamada

Toda Co., Tokyo, Japan

Hideaki Ishida

Denki Kagaku Kogyo K. K., Itoigawa, Niigata, Japan

Paper No. ICONE18-30141, pp. 551-557; 7 pages
doi:10.1115/ICONE18-30141
From:
  • 18th International Conference on Nuclear Engineering
  • 18th International Conference on Nuclear Engineering: Volume 1
  • Xi’an, China, May 17–21, 2010
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 978-0-7918-4929-3
  • Copyright © 2010 by ASME

abstract

As an alternative grouting material for the geological repository of long-lived radioactive waste, the “S uperf ine S pherical silica G rout” (SFSG) material is developed using a fine spherical silica and a fine calcium hydroxide. The developed SFSG material takes an advantage of its smaller particle size distribution (max. ∼1 micron or less) than those of the cementitious materials, and also provides a low alkaline environment so as to reduce unfavorable effects on the long-term performance of geological disposal system. The SFSG is a mixture of the “super fine silica powder”, the superfine calcium hydroxide and additives such as superplasticizer. Presently, the mixture being investigated for grouting materials is focused on water/binder ratio (W/B) of 1.2. Some preliminary laboratory experiments were carried out to characterize its fundamental properties from the viewpoint of practical use for geological disposal, which is required to be equivalent with the conventional cementitious materials in terms of penetrability, strength, pH performance and workability. From a series of experiments, it was concluded that SFSG is expected to become an alternative grouting material for a geological repository.

Copyright © 2010 by ASME

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