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<p>Due to climate change and increased human activities, the aeolian sand in arid and semi-arid regions poses significant challenges to transportation geotechnical engineering. This study explored the physical–mechanical properties and ecological improvement effect of guar gum on eolian sand curing, and examined the mechanisms of sand improvement. Curing tests were carried out on eolian sand samples with varying guar gum concentrations and curing durations to assess direct shear strength, unconfined compression strength, split tensile strength, and permeability. The microstructure analysis of the specimens was then performed. Potting tests were conducted on eolian sand with varying guar gum contents. The analysis focused on plant germination rates, root-to-shoot ratios, height, and diameter. The results indicate that: (1) The physical–mechanical test revealed that the optimal guar gum content for improving the mechanical properties of sandy soil was 1.5%, with an optimum curing time of 21 d. Compared to the 0.3%-content sand, the maximum content sand exhibited a 364.59% increase in compressive strength and a 765.10% increase in tensile strength. Additionally, compared to the untreated sandy soil, the sandy soil with the optimal content exhibited a 487.65&#xa0;kPa increase in cohesive force and a 63.72% increase in inner friction angle, while the permeability coefficient decreased by 97.5%. (2) The pot test demonstrated that 0.6% guar gum content in sand yielded a favorable germination rate and growth effect. (3) The optimal guar gum content was 0.6%, with a curing period of 21 d. (4) The scanning electron microscope(SEM) experiments revealed that the guar gum formed a gel layer during its function, which had varying effects on the pore structure.</p>

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Improvement of Aeolian Sand Using Guar Gum: Mechanical Behavior, Plant Growth Response, and Microstructural Evaluation

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Zihan Ai,
  • Xingang Wang,
  • Daozheng Wang,
  • Yanqiu Qi,
  • Zongjin Wang,
  • Kai Liu,
  • Shanxin Huo,
  • Chaoying Gu,
  • Jinyu Li,
  • Xuguang Ye

摘要

Due to climate change and increased human activities, the aeolian sand in arid and semi-arid regions poses significant challenges to transportation geotechnical engineering. This study explored the physical–mechanical properties and ecological improvement effect of guar gum on eolian sand curing, and examined the mechanisms of sand improvement. Curing tests were carried out on eolian sand samples with varying guar gum concentrations and curing durations to assess direct shear strength, unconfined compression strength, split tensile strength, and permeability. The microstructure analysis of the specimens was then performed. Potting tests were conducted on eolian sand with varying guar gum contents. The analysis focused on plant germination rates, root-to-shoot ratios, height, and diameter. The results indicate that: (1) The physical–mechanical test revealed that the optimal guar gum content for improving the mechanical properties of sandy soil was 1.5%, with an optimum curing time of 21 d. Compared to the 0.3%-content sand, the maximum content sand exhibited a 364.59% increase in compressive strength and a 765.10% increase in tensile strength. Additionally, compared to the untreated sandy soil, the sandy soil with the optimal content exhibited a 487.65 kPa increase in cohesive force and a 63.72% increase in inner friction angle, while the permeability coefficient decreased by 97.5%. (2) The pot test demonstrated that 0.6% guar gum content in sand yielded a favorable germination rate and growth effect. (3) The optimal guar gum content was 0.6%, with a curing period of 21 d. (4) The scanning electron microscope(SEM) experiments revealed that the guar gum formed a gel layer during its function, which had varying effects on the pore structure.