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Volume 39 Issue 6
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XU Si-fa, WU Xue-hui, HU Qi, ZHANG Yong, WANG Zhe. Influence of Ca2+ concentration on hydraulic properties of bentonite-sand mixtures[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(6): 1145-1150. DOI: 10.11779/CJGE201706022
Citation: XU Si-fa, WU Xue-hui, HU Qi, ZHANG Yong, WANG Zhe. Influence of Ca2+ concentration on hydraulic properties of bentonite-sand mixtures[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(6): 1145-1150. DOI: 10.11779/CJGE201706022
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Influence of Ca2+ concentration on hydraulic properties of bentonite-sand mixtures

  • Institute of Geotechnical Engineering, Zhejiang University of Technology, Hangzhou 310032, China

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  • Received Date: March 02, 2016
  • Published Date: June 24, 2017
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  • A liner system containing clay or bentonite-sand mixtures is installed on the bottom of a landfill to prevent contaminants from flowing into the surrounding ground. The influence of Ca2+ concentration and local settlement on hydraulic properties of bentonite-sand mixtures is studied by model tests. It is shown that Ca2+ concentration has significant influence on the hydraulic properties, while the bentonite-sand mixtures leak with Ca2+ concentration more than 3.00g/L. Ca2+ concentration correlates with seepage time, which is shortened with the increase of Ca2+ concentration. Under the same settlement conditions, leakage occurs to the bentonite-sand mixtures infiltrated by Ca2+ ion solution but not to those by distilled water solution. When Ca2+ concentration is higher than two times Na+ in solution, the sodium bentonite converts to calcium bentonite, and the hydraulic properties of the bentonite-sand mixtures decrease. Therefore, it is of theoretical and practical values to investigate the influence of Ca2+ concentration and local settlement on hydraulic properties of the bentonite-sand mixtures..
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