侵蚀性淋滤液作用下HPMC改性膨润土的防渗性能

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Abstract Hydroxypropyl methylcellulose (HPMC) was used to enhance the hydraulic performance of natural sodium bentonite to aggressive solution. Hydraulic conductivity and free swell tests using 5000mg/L CuSO4 and 0.5mol/L H₂SO₄ solution were conducted to test the hydraulic performance and swell ability of the HPMC modified bentonite. The hydraulic conductivity test results show that the hydraulic conductivity of the bentonite to CuSO₄ solution decreased by 32.28% to 77.40% after modification with 2% and 5% HPMC, respectively. Whereas, when permeated with H₂SO₄ solution, the hydraulic conductivity of the bentonite decreased by 73.42% to 92.83% when the mass loading of HPMC was 2% and 5%, respectively. When the HPMC loading reached 2%, the swell ability of the bentonite cannot be improved, whereas when the HPMC loading was up to 5%, the swell ability of bentonite can be enhanced by 2factors. These data illustrate that modification with HPMC could improve the hydraulic performance of bentonite to the aggressive solution, and the higher HPMC mass loading the higher hydraulic performance of bentonite. The improvement in the hydraulic performance should be attributed mainly to the clogging of the pore of the bentonite specimens.

Key words： geosynthetic clay liner (GCL) bentonite hydroxypropyl methylcellulose (HPMC) hydraulic conductivity swell index

Received: 11 February 2024

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X505

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	Articles by authors
	WANG Bao
	ZHOU Lin
	WANG Bai-chuan
	ZHU Jia-jia
	ZHANG Di
	ZHOU Hao-ran

Cite this article:

WANG Bao,ZHOU Lin,WANG Bai-chuan等. Hydraulic performance of HPMC modified bentonites against aggressive solution[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 5035-5043.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I9/5035

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