Design of the Concrete Used for Sub-surface LLW Disposal Facility
By K. Niwasem, M. Hironaga and Y. Tsuji
Concrete Journal, Vol.44, No.2, Feb. 2006
- Synopsis
- This report presents essential points in designing the concrete used for Sub-surface LLW disposal facility, in terms of the required performance and techniques. Especially from the viewpoint of system performance, long-term durability (e. g. over 10,000 years) of cement materials needs to be further investigated. An accurate evaluation method for the cement dissolution rate is required so as to evaluate the transition of concrete physical properties and the deterioration of Na-type bentonite materials under the high alkalinity. In the conceptual design of the facility, it is considered that the dissolution of cement materials progresses very slow from the surface and also considered that taking countermeasures to reduce the cement dissolution contribute to the improvement of durability of the engineered barrier system.
- Keywords:
- Radioactive waste, Sub-surface disposal, Engineered barrier system, Concrete, Bentonite, Cement dissolution, High alkaline
