| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete composition for uniformly dispersing an aggregate into concrete even if the aggregate having large specific gravity is used. SOLUTION: For the concrete composition for constructing a radiation shield, a heavy aggregate, such as magnetite and iron sand, whose specific gravity is approximately 4-5, pure iron whose specific gravity is close to 8, and an aggregate having large specific gravity, such as lead, are used for one portion or entire portion of the aggregate. Underwater-inseparable admixtures mainly made of a cellulose-based or acryl-based water-soluble polymer, or a thickening additive containing a compound A selected from a cationic interface activator and a compound B selected from an anionic aromatic series compound is blended to the concrete composition. COPYRIGHT: (C)2006,JPO&NCIPI |
