Estimation of Appropriate Concentration of Impregnated Chloride Solution for Wakkanai Siliceous Shale from Surface Wettedness Evaluation and the Relationship between Maximum Moisture Sorption and Pore Volume

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  • Nakabayashi Saya
    Division of Human Environmental System, Graduate School of Engineering, Hokkaido University
  • Nagano Katsunori
    Division of Human Environmental System, Graduate School of Engineering, Hokkaido University
  • Togawa Junya
    Wakkanai Green Factory Co., Ltd.
  • Nakamura Makoto
    Division of Human Environmental System, Graduate School of Engineering, Hokkaido University
  • Kurokawa Asami
    Wakkanai Green Factory Co., Ltd.

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Other Title
  • 表面濡れ度合いの評価および最大吸湿量と細孔容積の関係による稚内層珪質頁岩の上限塩化物含浸水溶液濃度の決定
  • ヒョウメン ヌレ ドアイ ノ ヒョウカ オヨビ サイダイキュウシツリョウ ト サイコウ ヨウセキ ノ カンケイ ニ ヨル ワッカナイソウケイシツ ケツガン ノ ジョウゲン エンカブツ ガンシン スイヨウエキ ノウド ノ ケッテイ

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Abstract

Wakkanai siliceous shale, a natural mesoporous material, is impregnated with lithium chloride, calcium chloride and sodium chloride solutions to improve its moisture adsorption capacity. However, excess impregnation leads to elution of sorbed moisture from pores to the surface under humid conditions, and the surface of the sample becomes wet. To determine appropriate concentrations of impregnating chlorides, the surface wettedness of the chloride-impregnated shale was estimated from the surface color changes of samples exposed to 75%RH air by using a digital scanner. The appropriate concentrations of lithium chloride and calcium chloride for the shale were 4 and 5 wt%, respectively. Moreover, the maximum moisture sorption of the shale impregnated with the appropriate chloride concentration agreed with the moisture retention predicted from the mesopore volume. This indicates that, in order to avoid elution of the chloride solution to the surface, the maximum moisture sorption of the chloride-impregnated shale should be smaller than the mesopore volume.

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