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Evolution mechanisms of hydrophobic and dynamic properties in hydrophobically modified silt subgrade subjected to wet–dry cycles and associated damage resistance mechanisms
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DOI：10.1080/10298436.2026.2697000.png)
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Abstract
En 中文
To mitigate service performance degradation of silt subgrades under cyclic dry-wet conditions, this study employs a nano-superhydrophobic material (NSHM) for hydrophobic modification of silt. A series of laboratory tests, including water droplet penetration test (WDPT), contact angle measurement, dynamic triaxial test, and scanning electron microscopy, were performed on NSHM-modified silt subjected to dry-wet cycles, to systematically characterize its hydrophobic properties, dynamic mechanical behaviors, and underlying modification mechanisms.Results show that NSHM markedly enhances silt hydrophobicity: both WDPT duration and contact angle increase significantly with rising NSHM dosage. At 0.5% content, modified silt achieves a superhydrophobic state, with only 1.1% contact angle reduction after nine dry-wet cycles. The attenuation rate of dynamic resilient modulus decreases progressively with higher NSHM content; the modulus of 0.5% NSHM-treated silt is approximately 20% higher than that of untreated silt after nine cycles. NSHM also alleviates deviatoric stress-induced shear softening and synergistically improves the modulus with confining pressure. A predictive model for dynamic resilient modulus incorporating dry-wet cycles, NSHM content, and stress state is developed and validated. Microscopic analysis reveals that NSHM coats silt particles and fills pore structures, thus enhancing dry-wet damage resistance.
Keywords:
Dynamic resilient modulus
dry–wet cycle
hydrophobic material
silt
prediction model
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