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

Zhong, Xiumei; Liang, Yuxin; Wang, Qian; Ma, Jinlian; Liang, Shouyun; Wang, Yan; Xu, Xiaowei

doi:10.32604/jrm.2022.021120

Cited by 6 publications

(2 citation statements)

References 50 publications

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“…The decrease in grain size is closely related to the structural changes in the soil and the degree of cementation between minerals [44]. It is inferred that under the effect of ion exchange and protonation (Figure 18), the positive charge of CLS neutralizes the negative charge on the soil surface, thus reducing the thickness of the double layer and making the mineral composition more aggregated and [45]. These results are consistent with the findings of Zhang et al [46].…”

Section: X-ray Diffraction Test Analysissupporting

confidence: 84%

Experimental Research on Collapsibility of Xi’an Loess Improved by Calcium Lignosulfonate

Bai

Zhang

et al. 2023

Coatings

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To improve the problem of collapsibility of loess, adding industrial materials such as cement is common engineering treatment, but this seriously damages the reclamation performance of soil. Calcium lignosulfonate (CLS) from paper plant waste fluids is a natural bio-based polymer with good application prospects as a soil improver. In this paper, the collapsibility and mechanical properties of CLS improved loess were investigated using a collapsibility test, gray correlation analysis, and an unconfined compressive strength test (UCS). In addition, the strengthening mechanism of CLS-improved loess was also explored based on scanning electron microscopy (SEM), microstructure parameters, and X-ray diffraction. The collapsibility coefficient decreased rapidly after CLS was admixed, and the single and double-oedometer methods showed the same change trend. The order of grey correlation degree of collapsibility on each index from large to small was: moisture content, pore ratio, dry density, and CLS content. The dosage of CLS greatly influenced the mechanical properties and collapsibility of stabilized loess. The optimum amount of CLS for Xi’an loess was 3%, at which the collapsibility coefficient was reduced by more than 95%, and the 28 d UCS increased by 180.01%. From the microstructure and mineral composition analysis perspective, CLS plays a role in filling pores and linking soil particles. After the protonation and ion exchange effect of CLS, the grain size and double electric layer thickness of mineral composition were reduced, and the structural compactness was increased. These research results are of great scientific significance for the ecological modification of soils.

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Section: X-ray Diffraction Test Analysissupporting

confidence: 84%

Experimental Research on Collapsibility of Xi’an Loess Improved by Calcium Lignosulfonate

Bai

Zhang

et al. 2023

Coatings

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show abstract

“…The reduction in grain size is closely related to the structural changes in the soil and the degree of cementation between minerals [39]. It is inferred that under the effect of ion exchange and protonation (Figure 14), the positive charge of CLS neutralizes the negative charge on the soil surface, thus reducing the thickness of the double layer and making the mineral composition more aggregated and denser, which contributes to the improvement of soil strength and resistance to the effects of collapsibility [40].…”

Section: X-ray Diffraction Test Analysismentioning

confidence: 99%

Experimental Research on Collapsibility of Xi'an Loess Improved by Calcium Lignosulfonate

Bai¹,

Li²,

Zhang³

et al. 2022

Preprint

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Collapsibility is an inherent characteristic of loess, which is often treated by adding industrial materials such as cement and lime in engineering, it seriously damages the reclamation performance of soil. Degradable calcium lignosulfonate (CLS) has a good prospect in balancing soil stabilization and environmental protection. Therefore, this paper evaluates the collapsibility and mechanical characteristics of CLS improved loess based on the collapsibility test, grey correlation analysis, and unconfined compressive strength test. The results show that when the content is 3%, the stabilization effect is most obvious, and the collapsibility coefficient can be reduced by more than 95%. The order of grey correlation degree of collapsibility on each index is moisture content, void ratio, dry density, and CLS content from large to small. The unconfined compressive strength increases rapidly in the first 14 days and then decreases with the content. When the content is too high, the strength of improved loess is lower than that of plain loess. Combined with SEM, microstructure parameters, and X-ray diffraction analysis, the carbonate minerals can play the role of filling pores and connecting soil particles, which reduces the grain size of mineral composition and the thickness of the electric double layer and makes the structure more compact. The research results have scientific significance and application value for the ecological modification research and engineering application of soil.

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Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate

Ma,

Pei,

et al. 2024

Int J Civ Eng

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

Cited by 6 publications

References 50 publications

Experimental Research on Collapsibility of Xi’an Loess Improved by Calcium Lignosulfonate

Experimental Research on Collapsibility of Xi’an Loess Improved by Calcium Lignosulfonate

Experimental Research on Collapsibility of Xi'an Loess Improved by Calcium Lignosulfonate

Performance Evaluation and Modification Mechanism of Red Clay Treated with Lignosulfonate

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