Proceedings of the Korean Society of Soil and Groundwater Environment Conference (한국지하수토양환경학회:학술대회논문집)

Korean Society of Soil and Groundwater Environment (한국지하수토양환경학회)
권호 표지

Swelling and Relative Hydraulic Conductivities of transformed Ca-bentonite with various Na-cemicals

  • Chung Doug-Young (Dept. of Agricultural Chemistry, College of Agricultural and Life Science, Chungnam National University) ;
  • Lee Kyo-S. (Dept. of Agricultural Chemistry, College of Agricultural and Life Science, Chungnam National University) ;
  • Lee Dong-S. (Dept. of Agricultural Chemistry, College of Agricultural and Life Science, Chungnam National University)
  • Published : 2006.04.01
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Abstract

To investigate the effect of solution pH and particle size of Na-bentonite on swelling characteristics and relative hydraulic conductivity, four kinds of acids and two alkali were selected. The results showed that the swelling was decreased to half of the original Na-bentonite's swelling index. Also the decrease in SI was most distinctive in pH 3.5 of HCl. But changes of swelling index between initial and stabilized were minimal in alkali treatment, compared to the change by acid treatment. No flux was detected under atmospheric pressure although there was drastic decrease in swelling. However, leaching started after application of 1.5 bars of air-pressure equivalent to 15 m of water head.

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