Abstract
The swelling behavior of a Na+-bentonite used in geosynthetic clay liners with lower dry unit weights (less than about 11 kN/m3) was investigated experimentally, and analyzed by diffuse double layer (DDL) theory. Four types of liquid were used. It has been found that the measured swelling pressures are about 20% of that predicted by DDL theory. There are linear relationships between the calculated double layer thickness and the measured corresponding free swelling index and liquid limit.
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