Hydrophobicity Assessment of Sands Treated with Tung Oil

Abstract

Hydrophobic (or water repellent) soils have been reported worldwide. Soil hydrophobicity shows significant effects on water infiltration, water movement, evaporation, and soil strength. The unique properties of hydrophobic soils have been recognized by geotechnical engineers. They have been considered as novel construction materials for ground infrastructure. Synthetic hydrophobic soil was then proposed as it can be more economic, sustainable, and durable. Artificially inducing soil hydrophobicity can be obtained by using hydrophobizing agents, e.g. silane compounds and fatty acid. This paper presents a study of synthetic hydrophobic sand treated with Tung oil, a natural vegetation oil. The soil hydrophobicity was assessed through varied methods (contact angles, water drop penetration time and water entry pressure). Relationships between different hydrophobicity indicators and the amount of the applied Tung oil were investigated. The most efficient concentration for applying Tung oil to sand was proposed.