Engineering properties and reinforcement mechanism of lignin-modified loess

WANG Qian; WANG Lanmin; LIU Zhaozhao; ZHONG Xiumei; GAO Zhongnan

doi:10.11779/CJGE2024S20022

Volume 46 Issue S2

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Chinese Journal of Geotechnical Engineering > 2024 > 46(S2): 150-154, 215. > DOI: 10.11779/CJGE2024S20022

WANG Qian, WANG Lanmin, LIU Zhaozhao, ZHONG Xiumei, GAO Zhongnan. Engineering properties and reinforcement mechanism of lignin-modified loess[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(S2): 150-154, 215. DOI: 10.11779/CJGE2024S20022

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Engineering properties and reinforcement mechanism of lignin-modified loess

WANG Qian^{1, 3, 4,},
WANG Lanmin¹,
LIU Zhaozhao^{2, 4},
ZHONG Xiumei^1, ,,
GAO Zhongnan¹

1.
Key Laboratory of Loess Earthquake Engineering, CEA, Lanzhou 730000, China
2.
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China
3.
College of Civil Engineering and Water Resources, Qinghai University, Xining 810016, China
4.
College of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China

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Received Date: June 20, 2024

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Abstract

Abstract

To effectively improve its weak engineering properties, the industrial by-product lignin is selected to improve the strength of the loess. The specific gravity, Atterberg limit, maximum dry density-optimal moisture content, and unconfined compressive strength (UCS) of the lignin-modified loess are tested by configuring the modified loess with different lignin contents. The engineering properties of the lignin-modified and the compacted loess are studied. The feasibility of the lignin-modified loess is discussed. Based on the results of the SEM, XRD, physical and mechanical properties tests, the reinforcement mechanism of the lignin-modified loess is analyzed. The results show that compared with that of the compacted loess, the specific gravity of the lignin-modified loess is significantly reduced. The liquid limit, plastic limit and plasticity index are reduced. Moreover, the maximum dry density and the optimum moisture content decrease. The lignin content and curing age significantly affect the engineering properties of the modified loess. When the curing age is 28 days and the lignin content is equal to 2%, the UCS of the modified loess is the highest, which is 32% higher than that of the compacted loess. The reinforcement mechanism of the lignin-modified loess mainly includes the interstitial effects of the lignin on the loess, cementation, clay mineral, ion exchange and electric double-layer adsorption.
- lignin,
- modified treatment,
- compressive strength,
- SEM,
- XRD

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