An exploration on the degradation of hydrophobized sands as a subgrade impervious barrier during one-year outdoor weathering

Hongjie Lin, Gege Huang, Sérgio d. n. Lourenço, Christopher t. s. Beckett, Xin Xing, Jiankun Liu

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Water drives the decay of road subgrades such as frost heave in cold areas and collapse in saline soil areas, which influences the safety and comfort of vehicle transportation. This paper proposes a novel geotechnical material, namely hydrophobized soil, as a subgrade fill material to mitigate water-induced degradation of subgrade. Hydrophobized soil has a low affinity to water and therefore can prevent the subgrade from water infiltration, enhancing the volume stability of subgrades. To demonstrate its feasibility, the hydrophobicity and its durability were investigated in this study. A one-year outdoor weathering test on hydrophobized soil columns was conducted, with the hydrophobicity measured. The results show that hydrophobized sand has different durabilities and exhibits different degradations depending on the chosen hydrophobizing agent and its concentration. Based on the testing results and capillary rise model, the design of hydrophobic hydraulic barrier in subgrade was discussed at the end.

Original languageEnglish
JournalActa geotechnica
Early online date3 Mar 2024
DOIs
Publication statusE-pub ahead of print - 3 Mar 2024

Keywords / Materials (for Non-textual outputs)

  • Hydrophobicity
  • SOIL-MOISTURE
  • Subgrade
  • Outdoor weathering
  • Fill materials
  • Hydrophobic soils

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