A study on the Evaluation of Permeability and Structure for Calcium Bentonite-Sand Mixtures

IF 0.4 Q4 ENGINEERING, GEOLOGICAL Journal of the Korean Geosynthetic Society Pub Date : 2019-01-01 DOI:10.12814/jkgss.2019.18.2.001
윤성열, 안현규, 오민아, Lee Jai-Young
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引用次数: 3

Abstract

This study was intended to evaluate the water permeability and structure for calcium bentonite-sand mixtures to utilize calcium bentonite as a liner. This study conducted physico-chemical properties tests, compaction tests, permeability test and Scanning Electron Microscopy analysis (SEM) analysis. It was found the higher the ratio of calcium bentonite, the lower the dry density with coefficient of permeability, and the higher the optimum moisture content. In particular, SEM analysis was found the higher the ratio of calcium bentonite, the higher the area of the montmorillonite particles. In conclusion, the optimum coefficient of permeability that finds the landfill liner condition (must be less than 1 × 10 cm/sec) was obtained when the ratio of calcium bentonite was 40% or higher. These findings may improve the understanding of the calcium bentonite as a liner. Calcium bentonite shows a similar permeability to sodium bentonite 7% when mixed at 40% or more. Therefore, it is considered that calcium bentonite can be utilized as a liner.
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钙-膨润土-砂混合料渗透性及结构评价研究
以钙基膨润土为衬垫材料,对钙基膨润土-砂混合材料的透水性和结构进行了研究。对其进行了理化性能测试、压实性测试、渗透性测试和扫描电镜分析。结果表明,钙基膨润土掺量越高,其干密度和渗透系数越低,最佳含水率越高。特别是SEM分析发现,含钙膨润土比例越高,蒙脱土颗粒面积越大。综上所述,当钙基膨润土掺量在40%及以上时,获得了满足填埋衬垫条件的最佳渗透系数(必须小于1 × 10 cm/sec)。这些发现有助于提高对钙基膨润土作为衬垫的认识。钙基膨润土在掺量为40%及以上时,渗透率与钠基膨润土7%相近。因此,认为钙基膨润土可用作衬里。
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