Sodium bentonite is the most important material in geosynthetic clay liners. The anti-leakage capacity of geosynthetic clay liner directly depends on the swelling index of sodium bentonite. According to the practical application of geosynthetic clay liners, this paper studies the swelling index of sodium bentonite in solutions with different PH value such as –1, 3, 5, 7, 9, 11, and 13, and in salt solution similar to sea water. It also presents the swelling index of sodium bentonite in acidic, neutral, alkaline and sea-water-like salt solutions under different temperatures such as 10 , 20 , 30 and 40 . The experimental results shows that the swelling indexes of sodium bentonite are lower in PH=1 and sea-water-like solutions than in others, but different temperatures have little effect on the swelling index of sodium bentonite in all solutions. The results have been analyzed and discussed.
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