Canadian Geotechnical Journal, Ahead of Print.
Swelling characteristics of compacted bentonite when hydrated with a hypersaline pore fluid (332 g/L total dissolved solids; 6.6 mol/L ionic strength) are reported. The pore fluid mimics the multiple constituents and their concentrations found for the Cobourg limestone of the Michigan Basin and is dominated by sodium (25% mole fraction) with some potassium, calcium, and magnesium (10%, 5%, and 4% mole fractions). Measurements of swell pressure for two sodium bentonites when hydrated under conditions of zero volume increase are reported. Swell pressure reached a peak within 10–30 h from the onset of hydration, followed by a continual decrease over 1 year of testing from chemical interaction between the bentonite and pore fluid. After 1 year, the swell pressure of the MX-80 bentonite tested decreased by a factor of nine relative to the peak swell pressure with deionized water when the dry density was 1.6 Mg/m3. Swell pressures increased as dry density increased. However, chemical interactions appear to have more influence on swell pressure than density for the pore fluid examined as a swell pressure of just under 1200 kPa was measured for MX-80 after 1.8 years of hydration when compacted to the highest dry density of 1.8 Mg/m3 examined.

中文翻译：

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高盐多组分孔隙液的膨润土溶胀特性

加拿大岩土工程杂志，预印本。
据报道，压实膨润土与高盐孔隙流体水合时的溶胀特性（总溶解固体332 g / L；离子强度6.6 mol / L）。孔隙流体模拟了密歇根盆地Cobourg石灰岩中发现的多种成分及其浓度，并且以钠（摩尔分数为25％），钾，钙和镁（摩尔分数为10％，5％和4％）为主。 ）。报道了在零体积增加的条件下水合时两种钠膨润土的溶胀压力的测量结果。在水合开始后的10-30小时内，溶胀压力达到峰值，然后经过1年的测试，膨润土和孔隙流体之间的化学相互作用持续降低。一年后 当干密度为1.6 Mg / m3时，所测试的MX-80膨润土的溶胀压力相对于去离子水的峰值溶胀压力降低了九倍。溶胀压力随干密度的增加而增加。但是，化学相互作用似乎对溶胀压力的影响比对所检查的孔隙流体的密度影响更大，因为在压实至最高干密度为1.8 Mg / g后，经过1.8年的水合作用，MX-80的溶胀压力仅为1200 kPa以下立方米。