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防渗用膨润土的抗冻特性

, PP. 1069-1076

Keywords: 膨润土,冻融,滤失量,流变性,微观结构

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Abstract:

为研究防渗用膨润土在寒旱区的适用性，对不同产地的3种膨润土的抗冻特性进行了研究。结果表明水化液为黄河水31次冻融后，膨润土自由膨胀体积增加了32.8%，溶液电导率（EC）均值增加了27.7%，切应力增加了40.6%，滤出液累积量降低了23.5%，滤失量降低了23.4%，滤饼厚度降低了15.4%。方差分析可知，冻融循环对膨润土自由膨胀体积、溶液EC值、切应力、滤出液累积量均有极显著影响(F＞F0.01)。冻融后膨润土微观结构参数变化范围为86.02~372.12μm，孔隙以板状及不规则孔隙为主，形态指标F值在0.12~0.40，孔隙表面分维在1.18~1.21。

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