Influence of Alkaline Alteration on the Shear Characteristics of a Bentonite-Sand Mixture
Influence of Alkaline Alteration on the Shear Characteristics of a Bentonite-Sand Mixture
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碱蚀对膨润土砂混合物剪切特性的影响
DOI：
10.1061/9780784480144.044
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
S. Yokoyama
中科院分区：
文献类型：
--
作者：
Yasutaka Watanabe;S. Yokoyama
本文研究了碱蚀变对膨润土砂混合物剪切特性的影响。将钙型膨润土和膨润土-砂混合物浸泡在氢氧化钠或氢氧化钙溶液中。利用浸泡的试件进行三轴压缩试验。对试验后样品的矿物组成、可浸出阳离子和微观结构进行了研究。碱性溶液对矿物的溶解和次生物质的沉淀改变了剪切强度。对于膨润土，矿物发生了明显的溶解，残余应力降低，而膨润土砂混合物的残余应力下降幅度较小。砂土的混合对控制残余应力的降低有显著的作用。
The paper presents the influence of alkaline alteration on shear characteristics of bentonite-sand mixture. The Ca-type bentonite and the bentonite-sand mixture were immersed in NaOH or Ca(OH)2solutions. Triaxial compression tests were executed using the immersed specimens. Mineral composition, leacheable cation and microstructure of the sample after the testing were investigated. Dissolution of minerals and precipitation of secondary materials by alkaline solutions changes shear strength. For the bentonite, dissolution of minerals significantly occurred, residual stress decreased, on the other hand, decrease in the residual stress in the bentonite-sand mixture was relatively small. The mixture of sand, remarkably, plays a role in controlling decrease in residual stress.