Title:
RETARDED HYDRATION TYPE CEMENT COMPOSITION AND MULTILAYER STRUCTURE TYPE SHIELDING BODY USING THE SAME
Document Type and Number:
Japanese Patent JP3282715
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide the cement composition excellent in ultralong-term durability with respect to proof stress performance, water cut-off performance, chemical stability, etc., and also to provide the shielding body which is capable of enclosing waste over an ultra-long period by using this cement composition and excellent in ultra-long-term durability with respect to proof stress performance, water cut-off performance, chemical stability, etc.
SOLUTION: This cement composition comprises cement that contains 30 to 70 wt.% of pozzolan and preferably, further contains ≥40 wt.% of belite. Also, within this shielding body, waste is placed and a structure surrounding the waste consists of at least two layers, or preferably, at least four layers, wherein as the material of an inner layer(s) other than the outermost layer or other than the innermost and outermost layers of these layers, the cement composition is used. As a result, in this multilayer structure, for example, the hydration in the innermost layer directly adjacent to the waste is faster than that in the inner layer adjacent to the outside of the innermost layer and the hydration becomes faster in the direction from the inner layer adjacent to the outside of the innermost layer toward the inner layer adjacent to the inside of the outermost layer.
Inventors:
Atsushi Matsui
Takehiro Nakano
Tatsuo Isohata
Takehiro Nakano
Tatsuo Isohata
Application Number:
JP30517797A
Publication Date:
May 20, 2002
Filing Date:
November 07, 1997
Export Citation:
Assignee:
CENTRAL RESEARCH INSTITUTE OF ELECTRIC POWER INDUSTRY
Sumitomo Osaka Cement Co., Ltd.
Sumitomo Osaka Cement Co., Ltd.
International Classes:
B09B1/00; B32B13/00; C04B7/19; C04B7/26; C04B18/04; C04B18/08; G21F1/04; C04B28/02; (IPC1-7): C04B28/02; B09B1/00; B32B13/00; C04B7/19; C04B7/26; G21F1/04
Domestic Patent References:
| JP648790A | ||||
| JP58131600A |
Other References:
日本コンクリート工学協会「コンクリート便覧」昭５３−７−２０初版３刷、技報堂出版発行、第７４０頁
Attorney, Agent or Firm:
Junko Sugimura (1 outside)
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