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

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 curv...

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Bibliographic Details
Published in:International journal of environmental research and public health 2022-11, Vol.19 (23), p.15554
Main Authors: Sun, Xin-Po, Ding, Ze-Hao, Bi, Yu-Zhang, Wang, Xin-Yi
Format: Article
Language:English
Subjects:
Acrylic resins
Atterberg limits
Clay
Cracks
Density
Dry density
Flocculation
Hydraulics
Ions
Light microscopy
Liquid limits
Mining
Moisture content
Optical microscopy
Particle size
Polarized light
Polyacrylate
Polymers
Porosity
Sodium
Soil
Soil moisture
Soil porosity
Soil water
Water
Water content
Zeolites
Zeolites - chemistry
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Summary: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.
ISSN:1660-4601
1661-7827
1660-4601
DOI:10.3390/ijerph192315554