Dynamic Elastic Modulus and Damping Ratio of Lignin-Modified Loess

Wang, Qian; Liu, Zhaozhao; Zhong, Xiumei; Gao, Zhongnan; Liu, Fuqiang

doi:10.32604/jrm.2021.014114

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…The curing temperature was 20 ± 2°C and the relative humidity was 95%. The curing conditions referred to the conditions used by Wang et al [40].…”

Section: Specimen Preparationmentioning

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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“…The curing temperature was 20 ± 2°C and the relative humidity was 95%. The curing conditions referred to the conditions used by Wang et al [40].…”

Section: Specimen Preparationmentioning

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

Self Cite

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show abstract

“…Based on soil-water character curve test and wet disintegration test, the water holding capacity and water stability of modified loess with different lignin contents were studied. The results show that the improved loess with 1%-2% lignin content has the best water holding capacity and water stability [47,48]. Therefore, based on existing research results, this paper selects the lignin as modified materials of collapsible loess.…”

Section: Introductionmentioning

confidence: 99%

Evaluation and Analysis of the Effect of Lignin Amelioration on Loess Collapsibility

Zhong¹,

Liang²,

Wang³

et al. 2022

Journal of Renewable Materials

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The road subgrade and road surface in collapsible loess area are prone to many engineering diseases such as uneven subgrade settlement, insufficient bearing capacity of soaked foundation, collapse and instability of subgrade side slope due to the special properties of loess. As an environment-friendly, low-cost soil modifier with good adhesion and chelation properties, lignin has been considered to be used in highway subgrade construction. In order to explore the effect of lignin on loess, the compressive and collapsible properties of modified loess with different lignin contents were analyzed based on consolidation compression test. The improvement mechanism of lignin on loess collapsibility was studied by means of infiltration test and SEM test. The results show that lignin fibers can promote the agglomeration of loose particles and form a network structure in the soil particle pores, enhance the cementation strength between particles and soil skeleton, and reduce the permeability of loess. With the increase of lignin fiber content, the improvement degree of loess collapsibility shows a trend of first increasing and then decreasing. When the lignin fiber content is 2%, the effect is the best, and the improved loess collapsibility is eliminated.

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Collapse inhibition mechanism analysis and durability properties of cement-stabilized Pisha sandstone

Geng

Jaturapitakkul

Qin

et al. 2022

Bull Eng Geol Environ

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Dynamic Elastic Modulus and Damping Ratio of Lignin-Modified Loess

Cited by 7 publications

References 29 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

Evaluation and Analysis of the Effect of Lignin Amelioration on Loess Collapsibility

Collapse inhibition mechanism analysis and durability properties of cement-stabilized Pisha sandstone

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