Experimental Research of Low Liquid Limit Silt Stabilized by Lignin in the Flooding Area of Yellow River

Kong, Xianghui; Song, Shuguang; Ming-yue, Wang; Zhao, Quanman

doi:10.1007/s10706-019-00975-1

Cited by 12 publications

(5 citation statements)

References 11 publications

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“…Zhang et al [32,33] evaluated the mechanical properties of lignin stabilized silt and carried out a field experimental study on the feasibility of lignin as a modified material for highway roadbed. Kong et al [34] studied the compactness, compressive strength and water stability of lignin stabilized silt. Wang et al [35] studied the dynamic characteristics of lignin-modified loess.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Freeze-Thaw Cycles on Unconfined Compressive Strength of Lignin Fiber-Reinforced Loess

Gao¹,

Zhong²,

Wang³

et al. 2022

Journal of Renewable Materials

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In the seasonal permafrost region with loess distribution, the influence of freeze-thaw cycles on the engineering performance of reinforced loess must be paid attention to. Many studies have shown that the use of fiber materials can improve the engineering performance of soil and its ability to resist freeze-thaw cycles. At the same time, as eco-environmental protection has become the focus, which has been paid more and more attention to, it has become a trend to find new environmentally friendly improved materials that can replace traditional chemical additives. The purpose of this paper uses new environmental-friendly improved materials to reinforce the engineering performance of loess, improve the ability of loess to resist freeze-thaw cycles, and reduce the negative impact on the ecological environment. To reinforce the engineering performance of loess and improve its ability to resist freeze-thaw cycles, lignin fiber is used as a reinforcing material. Through a series of laboratory tests, the unconfined compressive strength (UCS) of lignin fiber-reinforced loess under different freeze-thaw cycles was studied. The effects of lignin fiber content and freeze-thaw cycles on the strength and deformation modulus of loess were analyzed. Combined with the microstructure features, the change mechanism of lignin fiber-reinforced loess strength under freeze-thaw cycles was discussed. The results show that lignin fiber can improve the UCS of loess under freeze-thaw cycles, but the strengthening effect no longer increases with the increase of fiber content. When the fiber content is less than 1%, the UCS growth rate of loess is the fastest under freeze-thaw cycles. And the UCS of loess with 1% fiber content is the most stable under freeze-thaw cycles. The freeze-thaw cycles increase the deformation modulus of loess with 1% fiber content, and its ability to resist deformation is obviously better than loess with 1.5%, 2% and 3% fiber content. The fiber content over 1% will weaken the strengthening effect of lignin fiber-reinforced loess, and the optimum fiber content of lignin fiber-reinforced loess under freeze-thaw cycles is 1%.

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Section: Introductionmentioning

confidence: 99%

The Influence of Freeze-Thaw Cycles on Unconfined Compressive Strength of Lignin Fiber-Reinforced Loess

Gao¹,

Zhong²,

Wang³

et al. 2022

Journal of Renewable Materials

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show abstract

“…When the lignin content exceeds a certain value, the three mechanical indexes decrease with the increase of lignin. Other researchers have obtained similar results when using lignin to improve low-liquid-limit clay, silty sand, and silt [31,[37][38][39]. For example, Zhang et al [31] found that when the lignin content exceeded 12%, the UCS, CBR, and resilience modulus of the improved soil showed a decreasing trend.…”

Section: Mechanical Propertiesmentioning

confidence: 72%

“…In addition, the researchers found a common phenomenon that the lignin content has a greater impact on the mechanical properties of the improved soil. However, the mechanical properties of the improved soil will gradually decrease when the lignin content is more than a certain amount, which is different from traditional stabilizers such as cement and lime [32,[37][38][39].…”

Section: Introductionmentioning

confidence: 99%

The Engineering Properties and Microscopic Characteristics of High-Liquid-Limit Soil Improved with Lignin

et al. 2022

Self Cite

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To improve the engineering performance of high-liquid-limit soil, lignin, a by-product of the papermaking industry, was used. First, the influence of lignin content and curing age on the physicochemical and mechanical properties of the improved soil was determined by carrying out pH, Atterberg limits, heavy compaction, unconfined compressive strength (UCS), California bearing ratio (CBR), and resilience modulus tests. Secondly, microscopic images obtained by scanning electron microscopy (SEM) were analyzed. The characteristic and evolution rules of the microstructure were expounded for the improved soil. Finally, combining SEM with energy-dispersive spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) analysis, the mechanism of lignin improvement on high-liquid-limit clay is discussed from the perspective of molecular structure. The results showed that the pH value of lignin-improved soil was much lower than that of quicklime-improved soil, which were 7.0 and 11.7, respectively. When the lignin content was 3%, the dry density and mechanical indexes (UCS, CBR, and resilience modulus) of the improved soil all showed the maximum values. From the perspective of microstructure, the connection between soil particles was strengthened through the wrapping and filling of the flocculent cementing materials produced by lignin. The improvement mechanism of lignin on soil was the combined result of ion exchange, hydrogen bonding, covalent bonding, and electrostatic attraction.

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“…The results show that lignosulfonate stabilized soil possesses higher moisture stability coefficient than lime stabilized soil. Similar research was carried out by Kong et al (2019) where lignosulfonate was used to improve low liquid limit silt in the flooding area of the Yellow River. Lignosulfonate was also used in combination with polypropylene fiber and electroosmosis technique to treat highly dispersive clay (Vakili et al, 2018a;Vakili et al, 2018b).…”

Section: Introductionmentioning

confidence: 72%

Utilization of bioethanol industry recycled waste for sustainable soil improvement: A win-win application

Liu

Cao

Wang

et al. 2021

Engineering Geology

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Experimental Research of Low Liquid Limit Silt Stabilized by Lignin in the Flooding Area of Yellow River

Cited by 12 publications

References 11 publications

The Influence of Freeze-Thaw Cycles on Unconfined Compressive Strength of Lignin Fiber-Reinforced Loess

The Influence of Freeze-Thaw Cycles on Unconfined Compressive Strength of Lignin Fiber-Reinforced Loess

The Engineering Properties and Microscopic Characteristics of High-Liquid-Limit Soil Improved with Lignin

Utilization of bioethanol industry recycled waste for sustainable soil improvement: A win-win application

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