| abstract |
[PROBLEMS] To provide a cement material capable of solidifying a high-concentration boric acid aqueous solution and a neutron absorber using the same. SOLUTION: It is a solidifying agent for a high-concentration boric acid aqueous solution containing calcium aluminates and calcium hydroxide, and further contains an alkali metal salt and / or a clay mineral such as bentonite or zeolite, blast furnace slag, silica fume, It is a solidified material of the high-concentration boric acid aqueous solution containing at least one or more of siliceous substances such as fly ash. Further, it is a neutron absorber obtained by kneading and molding a solidified material of a high-concentration boric acid aqueous solution and a boric acid aqueous solution. |