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Water-Holding Properties of Clinoptilolite/Sodium Polyacrylate-Modified Compacted Clay Cover of Tailing Pond

Author

Listed:
  • Xin-Po Sun

    (College of Civil Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
    These authors contributed equally to this work.)

  • Ze-Hao Ding

    (College of Civil Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
    These authors contributed equally to this work.)

  • Yu-Zhang Bi

    (Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China)

  • Xin-Yi Wang

    (School of Design, Hong Kong Polytechnic University, Hong Kong 999077, China)

Abstract

Clinoptilolite and sodium polyacrylate (Na-PAA) were used as water-retaining agents to improve the water-holding capacity of compacted clay cover (CCC). The optimum moisture content and Atterberg limits of the CCC modified by clinoptilolite and Na-PAA were studied. The soil–water characteristic curve (SWCC) of the CCC modified by clinoptilolite and Na-PAA was studied. The mesostructure of the CCC was analyzed by polarized light microscopy. The test results show that: (1) the optimum moisture content and liquid limit of the CCC modified by clinoptilolite and Na-PAA increased, while the maximum dry density decreased; (2) the SWCC of the CCC modified by clinoptilolite and Na-PAA shifts to the upper right, and the volume moisture content of modified CCC is higher than that of unmodified CCC under the same matrix suction; (3) compared with the unmodified CCC, the air-entry value (AEV) of the clinoptilolite-modified CCC increased by 65.18% at most, and the AEV of the further modified CCC with Na-PAA in-creased by about two times; and (4) the flocculation structure and porosity of modified CCC decreased, and the porosity was distributed uniformly.

Suggested Citation

  • Xin-Po Sun & Ze-Hao Ding & Yu-Zhang Bi & Xin-Yi Wang, 2022. "Water-Holding Properties of Clinoptilolite/Sodium Polyacrylate-Modified Compacted Clay Cover of Tailing Pond," IJERPH, MDPI, vol. 19(23), pages 1-20, November.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:23:p:15554-:d:981768
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    References listed on IDEAS

    as
    1. Yu-Zhang Bi & Xian-Lei Fu & Shi-Ji Zhou & Jin Ni & Yan-Jun Du, 2022. "Field Investigation of Effect of Plants on Cracks of Compacted Clay Covers at a Contaminated Site," IJERPH, MDPI, vol. 19(12), pages 1-17, June.
    2. Marcin K. Widomski & Anna Musz-Pomorska & Wojciech Franus, 2021. "Hydraulic and Swell–Shrink Characteristics of Clay and Recycled Zeolite Mixtures for Liner Construction in Sustainable Waste Landfill," Sustainability, MDPI, vol. 13(13), pages 1-20, June.
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