Expansion control for cementation of incinerated ash

焼却灰セメント固化体の膨張抑制

中山 卓也  ; 鈴木 眞司; 花田 圭司; 富岡 修 ; 佐藤 淳也 ; 入澤 啓太  ; 加藤 潤 ; 川戸 喜実; 目黒 義弘  

Nakayama, Takuya; Suzuki, Shinji; Hanada, Keiji; Tomioka, Osamu; Sato, Junya; Irisawa, Keita; Kato, Jun; Kawato, Yoshimi; Meguro, Yoshihiro

A method, in which incinerated ash is solidified with a cement material, has been developed to dispose of radioactive incinerated ash waste. A small amount of metallic Al, which was not oxidized in the incineration, existed in the ash. When such ash was kneaded with a cement material and water, H generation began immediately just after the kneading, H bubbles pushed up the kneaded muddy material and an expanded solidified form was obtained. In this study, we tried to control H generation by means of following two methods, one was a method to let metallic Al react prior to the cementation and the other was a method to add an expansion inhibitor that made an oxide film on the surface of metallic Al. The solidified forms prepared using the pre-treated ash and lithium nitrite were not expanded.