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バリア複合化学環境影響調査,3; 鉄共存下でのベントナイトの変質; 実験及び天然での事例から示唆される現象

Studies on coupled behavior of the high-level radioactive waste repository

笹本 広  ; 九石 正美; 石井 智子*; 加藤 博康*; 杉山 和稔*

Sasamoto, Hiroshi; Sazarashi, Masami; Ishii, Tomoko*; Kato, Hiroyasu*; Sugiyama, Kazutoshi*

鉄共存下でのベントナイトの変質に関して、温度・鉄-ベントナイト(I/B)比を変えた室内実験及び文献調査に基づく天然における変質事例の整理を行った。その結果、概略的ではあるが温度・I/B比に着目した場合のスメクタイトに顕著な変質が生じる条件が明らかになった。また、鉄共存下でのベントナイトの変質評価を行う際、対象とする温度・時間に応じて、評価上考慮すべき重要な変質生成物を抽出,整理できた。

Regarding to alteration of bentonite coexisting with iron material, laboratory experiments with different temperature and iron-bentonite (I/B) ratio and literature surveys for bentonite alteration in the natural system were conducted. As the results, the conditions which promote the alteration of smectite significantly were estimated approximately. Additionally, the important alteration products necessary for evaluation of smectite alteration were summarized by literature surveys. Such information will be useful for evaluation of smectite alteration considering the conditions of time and duration interested.

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