Bentonite swelling characteristics with a hypersaline multi-component pore fluid
| Autor: | Grant Su, M.S. Hosney, K. Lange, J. Brown, Richard W I Brachman, A. Baral, R. K. Rowe, Truong-Son Nguyen |
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| Rok vydání: | 2021 |
| Předmět: |
Chemistry
Component (thermodynamics) 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology Chemical interaction Geotechnical Engineering and Engineering Geology Total dissolved solids 0201 civil engineering Chemical engineering Ionic strength Bentonite medicine Pore fluid Geotechnical engineering Swelling medicine.symptom 021101 geological & geomatics engineering Civil and Structural Engineering |
| Zdroj: | Canadian Geotechnical Journal. 58:367-376 |
| ISSN: | 1208-6010 0008-3674 |
| DOI: | 10.1139/cgj-2019-0558 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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