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

Xin-Po Sun, Ze-Hao Ding, Yu-Zhang Bi () and Xin-Yi Wang ()
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Xin-Po Sun: College of Civil Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
Ze-Hao Ding: College of Civil Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
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

IJERPH, 2022, vol. 19, issue 23, 1-20

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.

Keywords: clinoptilolite; sodium polyacrylate (Na-PAA); tailing pond; water-holding capacity; soil–water characteristic curve (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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