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Experimental Study on Microstructure and Hydraulic Performance of Bentonite Modified Loess
https://orcid.org/https://orcid.org/0000-0002-4176-4520
https://orcid.org/https://orcid.org/0000-0003-1728-9536
https://orcid.org/https://orcid.org/0000-0003-0768-3994
https://orcid.org/https://orcid.org/0000-0001-8980-8767
The impact of natural sodium bentonite on the microstructure, permeability and strength characteristics of bentonite-modified loess (BML) were evaluated by scanning electron microscope (SEM) test, triaxial flexible wall permeability test, uniaxial compression test and direct shear tests. The experimental results indicate that bentonite can be used for loess solidification attributed to its effective particle filling, water absorption and expansion characteristics. The quantitative parameters of SEM images such as the average pore area, width, length and surface porosity of BML declined first and then increased with bentonite content, and the lowest was observed at a bentonite content of 15%. The hydraulic conductivity of BML declined with increasing bentonite content and was lower than the maximum allowable limit of 1.0 × 10−9 m/s. The uniaxial compressive strength and shear strength parameters of BML increased initially and subsequently declined as bentonite content increased. A normalized prediction model was established for modified loess based on the correlation between mechanical characteristics and the microscopic pore parameters, which was verified to be rational in estimating the macro- and micro-scale properties of BML. Therefore, when the anti-seepage landfill layers are constructed in the Loess Plateau area, 15% of bentonite is recommended in modified loess, which has optimal impermeability and mechanical properties.
Experimental Study on Microstructure and Hydraulic Performance of Bentonite Modified Loess
https://orcid.org/https://orcid.org/0000-0002-4176-4520
https://orcid.org/https://orcid.org/0000-0003-1728-9536
https://orcid.org/https://orcid.org/0000-0003-0768-3994
https://orcid.org/https://orcid.org/0000-0001-8980-8767
The impact of natural sodium bentonite on the microstructure, permeability and strength characteristics of bentonite-modified loess (BML) were evaluated by scanning electron microscope (SEM) test, triaxial flexible wall permeability test, uniaxial compression test and direct shear tests. The experimental results indicate that bentonite can be used for loess solidification attributed to its effective particle filling, water absorption and expansion characteristics. The quantitative parameters of SEM images such as the average pore area, width, length and surface porosity of BML declined first and then increased with bentonite content, and the lowest was observed at a bentonite content of 15%. The hydraulic conductivity of BML declined with increasing bentonite content and was lower than the maximum allowable limit of 1.0 × 10−9 m/s. The uniaxial compressive strength and shear strength parameters of BML increased initially and subsequently declined as bentonite content increased. A normalized prediction model was established for modified loess based on the correlation between mechanical characteristics and the microscopic pore parameters, which was verified to be rational in estimating the macro- and micro-scale properties of BML. Therefore, when the anti-seepage landfill layers are constructed in the Loess Plateau area, 15% of bentonite is recommended in modified loess, which has optimal impermeability and mechanical properties.
Experimental Study on Microstructure and Hydraulic Performance of Bentonite Modified Loess
https://orcid.org/https://orcid.org/0000-0002-4176-4520
https://orcid.org/https://orcid.org/0000-0003-1728-9536
https://orcid.org/https://orcid.org/0000-0003-0768-3994
https://orcid.org/https://orcid.org/0000-0001-8980-8767
The impact of natural sodium bentonite on the microstructure, permeability and strength characteristics of bentonite-modified loess (BML) were evaluated by scanning electron microscope (SEM) test, triaxial flexible wall permeability test, uniaxial compression test and direct shear tests. The experimental results indicate that bentonite can be used for loess solidification attributed to its effective particle filling, water absorption and expansion characteristics. The quantitative parameters of SEM images such as the average pore area, width, length and surface porosity of BML declined first and then increased with bentonite content, and the lowest was observed at a bentonite content of 15%. The hydraulic conductivity of BML declined with increasing bentonite content and was lower than the maximum allowable limit of 1.0 × 10−9 m/s. The uniaxial compressive strength and shear strength parameters of BML increased initially and subsequently declined as bentonite content increased. A normalized prediction model was established for modified loess based on the correlation between mechanical characteristics and the microscopic pore parameters, which was verified to be rational in estimating the macro- and micro-scale properties of BML. Therefore, when the anti-seepage landfill layers are constructed in the Loess Plateau area, 15% of bentonite is recommended in modified loess, which has optimal impermeability and mechanical properties.
Experimental Study on Microstructure and Hydraulic Performance of Bentonite Modified Loess
KSCE J Civ Eng
Li, Yanfeng (author) / Xu, Jian (author) / Wang, Zefeng (author) / Wang, Bao (author)
KSCE Journal of Civil Engineering ; 27 ; 2778-2791
2023-07-01
14 pages
Article (Journal)
Electronic Resource
English
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