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Homogenization Analysis of Problems related to Quartz Dissolution and Hydroxide Diffusion  

Choi, Jung-Hae (Department of Urban Environmental Development, Okayama University)
Ichikawa, Yasuaki (Department of Urban Environmental Development, Okayama University)
Publication Information
The Journal of Engineering Geology / v.20, no.3, 2010 , pp. 271-279 More about this Journal
Abstract
Time-dependent behavior similar to secondary deformation related to mineral dissolution is easily observed when performing a laboratory pressure experiment. In this research, to observe the dissolution of quartz found in bentonite used as buffer material for the geological disposal of high-level waste (HLW) under conditions of high pH, we calculated the diffusion of $OH^-$ ions and the behavior of quartz dissolution using the homogenization analysis method. The results reveal that the rate of quartz dissolution is proportional to the temperature and interlayer water thickness. In particular, in a high-pH environment, the reacted area (and therefore the dissolution rate) increases with decreasing interlayer water thickness.
Keywords
time-dependent behavior; dissolution mechanism; homogenization analysis method; ion diffusion;
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