Research on waterproof performance and mechanism of organic silicon hydrophobic material for roadbed soil

In order to provide a new method for inhibiting the rise of capillary water, the influence of hydrophobic materials on the water-repellent performance of roadbed soils was investigated and the influence of hydrophobic substance dosage per unit area and action time on soil impermeability was analyzed. The results demonstrate that the permeability coefficient of the soil reduces dramatically as the amount of hydrophobic material per unit soil area increases, and start with an increment but later turned into a decrement with the action time. The permeability coefficient of the soil was 0.7892×10−7 cm/s as the minimum as with a drop of 98.86 percent under conditions of 125 g per unit area and an action time of 24 h. Furthermore, the organic silicone hydrophobic material will eventually form a dense hydrophobic film to block the infiltration of external water, thereby enhancing the hydrophobicity of the soil.