Laboratory Experiments on the Alteration of Highly-Compacted Bentonite by Alkaline Solution and the Effects on Physical Properties
Laboratory Experiments on the Alteration of Highly-Compacted Bentonite by Alkaline Solution and the Effects on Physical Properties
复制标题
碱性溶液对高压实膨润土的蚀变及其对物性影响的室内实验
DOI：
10.1115/icem2011-59318
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Shuichi Yamamoto
中科院分区：
文献类型：
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作者：
S. Miyoshi;S. Morikami;Y. Kimura;Tomoko Jinno;Shuichi Yamamoto
在温度为70℃的条件下，将密度与日本中级处置设想值相同的压实膨润土注入1.0mol/L氢氧化钠溶液，进行了室内实验。在碱溶液注入约600天后，将膨润土从仪器中取出，并进行了一些分析。膨润土中的伴生矿物钙玉石和石英在XRD图中溶解消失。然后将安钙作为次生矿物析出。虽然蒙脱石被溶解，但其质量分数保持在近似。使用碱溶液注入结束时的流量计算的膨润土的水力导率小于基于压实膨润土的水力导率作为孔隙溶液当量浓度、蒙脱土部分空隙比和钠离子当量与交换阳离子当量之比的函数的经验模型的预测值。造成这种差异的原因可能是矿物溶解导致的孔径减小和含高浓度硅的孔溶液粘度大。©2011 asme
The laboratory experiment was done that 1.0mol/L sodium hydroxide solution was injected to the compacted bentonite whose density is the same as the prospected value in the concept of the intermediate-level disposal in Japan in the circumstance of 70°C temperature. After the injection of the alkali solution for approximately 600 days, the bentonite was taken out of the apparatus and some sorts of analysis were done. The accompanying minerals in the bentonite, calcedony and quartz, were dissolved and disappeared in XRD charts. Then analcime was precipitated as a secondary mineral. Although montmorillonite was dissolved, the mass fraction of it was kept approximately. The hydraulic conductivity of the bentonite calculated using the flow rate at the end of the injection of alkali solution was smaller than the prospected value based on a widely-used empirical model of the hydraulic conductivity of compacted bentonite as a function of the equivalent concentration of pore solution, montmorillonite partial void ratio, and the ratio of sodium ion equivalent to the exchangeable cation equivalent. The reasons for the difference were supposed to be the decrease of pore size brought by mineral dissolution and the large viscosity of pore solution involving high concentration aqueous silicon.© 2011 ASME