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The majority of test data indicate that the hydraulic conductivity of soil-sodium bentonite mixtures increases several folds with many of the chemicals found at waste disposal sites. This investigation is on mixtures consisting of calcium bentonites from four different sources, cement, slag, and fly ash using flexible wall permeameter. The mix with calcium bentonite from Greece yielded hydraulic conductivity values which were equal to or lower than 10-7 cm/s. With water and organic chemicals (aniline 5,000 ppm, phenol 5,000 ppm, toluene 500 ppm) the soil mix showed a decrease in hydraulic conductivity. Over a 40 day period the hydraulic conductivity decreased from about 10-7 cm/s to 10-9 cm/s. The rate of decrease in hydraulic conductivity with phenol was somewhat slower. The hydraulic conductivity did not increase with time with any of the chemicals.
slurry wall, calcium bentonite, sodium bentonite, hydraulic conductivity, flexible wall permeameter, fly ash, slag, cement
Professor, New Jersey Institute of Technology, Newark, NJ
Staff engineer, Dames & Moore, Cranford, NJ