Role of Bentonite Buffer in the Presence of Cement Leaching Water(Waste Management and Clay Barriers and Civil Engineering,Proceedings of the 13^<th> International Clay Conference)

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概要

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• The GESPER coupled geochemical reaction-mass transport analysis code was improved for application to complex regions, e. g. engineered barriers and the surrounding rock regions in radioactive waste disposal systems. To investigate the role of a bentonite buffer in systems with cementitious materials as a component, typical phenomena considered in the interaction of cement leaching water and a typical Japanese sodium-type bentonite were analyzed by code under various conditions. Bentonite calcification, calcite precipitation, and pH-dependent protonation of the edge sites of smectite were examined. Cation-exchange characteristics of the bentonite may maintain the expected performance of sodium-type bentonite under conditions of sodium concentration higher than about 0.01M in the pore water. Abentonite buffer layer of 1m thickness may reduce pH in the pore water for several hundred years. Phenomena in the bentonite and surrounding rock were calculated simultaneously using a multimedia model, to be discussed.

• 日本粘土学会の論文

著者

• Tsukamoto Masaki

  Central Research Institute Of Electric Power Industry

• Sugiyama Daisuke

  Central Research Institute Of Electric Power Industry

• Fujita Tomonari

  Central Research Institute Of Electric Power Industry

関連論文

• Role of Bentonite Buffer in the Presence of Cement Leaching Water(Waste Management and Clay Barriers and Civil Engineering,Proceedings of the 13^ International Clay Conference)

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