Abstract
The free swelling behaviour of bentonite sand mixtures have been studied using different percentage of ethanol-water and methanol-water solutions. Free swell index tests were conducted at different proportion of ethanol and methanol with distilled water(0%, 20%, 40%, 60%, 80% and 100%). Free swell index (FSI), modified free swell index (MFSI) and free swell ratio (FSR) were determined from the results obtained from the tests. FSI, MFSI and FSR decrease with the increase of ethanol as well as methanol percentage. Good linear correlation have been observed between the dielectric constants of the pore fluids and FSI and MFSI of the bentonite sand mixtures. The study focuses on the significant influence of dielectric constants of different percentage of ethanol and methanol water solution on the free swell of bentonite-sand mixtures. Keywords: Free swell index; modified free swell index; dielectric constant; bentonite; ethanol, methanol
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