Changes in Swelling Pressure and Permeability of Bentonite Caused by Ion Exchange of Montmorillonite
Changes in Swelling Pressure and Permeability of Bentonite Caused by Ion Exchange of Montmorillonite
复制标题
蒙脱土离子交换引起膨润土膨胀压力和渗透率的变化
DOI：
10.1007/978-981-13-2227-3_64
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
S. Yokoyama
中科院分区：
文献类型：
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作者：
Yasutaka Watanabe;S. Yokoyama
使用盐溶液对压实膨润土-砂混合物进行渗透性测试。在用去离子水完全饱和后，将Ca型膨润土暴露于NaCl或KCl溶液中引起蒙脱石的离子交换。 Ca离子交换为Na离子后，与Na离子交换前的初始值相比，在低离子强度条件下样品的膨胀压力增加，渗透率降低。而Ca离子交换为K离子后，膨胀压力的增加和渗透性的降低并不显着。 K和Na离子表现出离子交换对膨润土工程性能的不同影响。
Permeability tests of the compacted bentonite-sand mixture using salt solutions were carried out. Exposure of the Ca type-bentonite to NaCl or KCl solutions after fully saturation with deionized water caused ion exchange of the montmorillonite. After Ca ion exchanged to Na ion, the swelling pressure of the sample increased and the permeability decreased when the low ionic strength condition, comparing with the initial value before Na ion exchange. While, after Ca ion exchanged to K ion, increase in the swelling pressure and reduction of the permeability were insignificant. K and Na ions showed the different effect of ion exchange on the engineering properties of the bentonite.