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<p>Peat soil presents considerable engineering challenges owing to its high water content, elevated organic matter content, and low bearing capacity. This study investigated the use of octadecyl primary amine (ODA) as a chemical amendment to enhance the hydrophobicity and mechanical properties of peat soil. A comprehensive series of laboratory tests was conducted, including water drop penetration, wetting-drying-induced cracking, unconfined compressive strength, tensile strength, direct shear, and scanning electron microscopy analyses. The results demonstrated that ODA effectively enhanced the hydrophobic characteristics of peat soil, with optimal efficacy observed at a concentration of 0.3%. Wetting-drying cycle tests revealed steeper drying curves, reduced residual moisture content, and a three-stage evaporation process—comprising constant-rate, falling-rate, and residual phases. Crack pattern analysis indicated a more compact, shorter, and narrower crack network, suggesting microstructural refinement. Mechanical testing confirmed improvements in compressive strength, cohesion, and internal friction angle; however, the rate of improvement decreased with higher ODA dosages. The underlying modification mechanisms are attributed to chemical interactions between ODA molecules and soil constituents, reorganization of the soil microstructure, and enhanced inter-particle bonding. These findings offer valuable technical guidance for geotechnical engineering applications in peat-rich regions.</p>

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Enhancing the Mechanical Properties and Reducing Water Sensitivity of Peat Soil Using Octadecyl Primary Amine

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Jun-Wei Jiang,
  • Zheng-Ping Xiao,
  • Shan Zhao,
  • Si-Yao Zhou,
  • Xin-Sheng Zhang,
  • Yin-Lei Sun

摘要

Peat soil presents considerable engineering challenges owing to its high water content, elevated organic matter content, and low bearing capacity. This study investigated the use of octadecyl primary amine (ODA) as a chemical amendment to enhance the hydrophobicity and mechanical properties of peat soil. A comprehensive series of laboratory tests was conducted, including water drop penetration, wetting-drying-induced cracking, unconfined compressive strength, tensile strength, direct shear, and scanning electron microscopy analyses. The results demonstrated that ODA effectively enhanced the hydrophobic characteristics of peat soil, with optimal efficacy observed at a concentration of 0.3%. Wetting-drying cycle tests revealed steeper drying curves, reduced residual moisture content, and a three-stage evaporation process—comprising constant-rate, falling-rate, and residual phases. Crack pattern analysis indicated a more compact, shorter, and narrower crack network, suggesting microstructural refinement. Mechanical testing confirmed improvements in compressive strength, cohesion, and internal friction angle; however, the rate of improvement decreased with higher ODA dosages. The underlying modification mechanisms are attributed to chemical interactions between ODA molecules and soil constituents, reorganization of the soil microstructure, and enhanced inter-particle bonding. These findings offer valuable technical guidance for geotechnical engineering applications in peat-rich regions.