Abstract
AbstractThe reaction of montmorillonite was investigated. Three kinds of bentonites with different montmorillonite composition were mixed with 0.3M NaOH solution and 0.3M Ca(OH)2 slurry. They were immersed at 60°C, 90°C, 120°C and 180°C for one month, three months and six months. The concentrations of the soluble ions were measured and the bentonites were analyzed quantitatively after the immersion. 50% of the montmorillonite was reacted within two weeks at greater than 90°C. Montmorillonite reacts less when mixed with Si-minerals. It extensively reacted in 0.3M Ca(OH)2 slurry. These results suggest that the reaction mechanism of the montmorillonite in alkaline solution was dominantly Si dissolution, and would decrease by controlling the concentration of Si ion. The cement / bentonite system under Si saturated conditions is discussed.
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