That organosilicon hydrophobic impregnating agents such as silane are coated on the reinforced concrete surface is one of anticorrosion measures of reinforced concrete. The penetrating depth of organosilicon hydrophobic impregnating agents in concrete is an important parameter for the durability of reinforced concrete. There is no nondestructive measure method for measuring the penetrating depth of silane in concrete onsite by now, so it is expected to be obtained based on Darcy's law in this paper. The influence of different cement types and different water cement ratios on the penetrating depth of silane, the contact angle of silane, the concrete porosity and the concrete pore radius of the capillary were studied. The intrinsic permeability coefficients of concrete were researched by using Darcy's law. The surface contact angle on the concrete surface is almost the same with different cement types and different water cement ratios. The concrete total porosity and the pore radius are influenced by cement types and water cement ratios. The most probable pore radius has positive correlation to the penetrating depth of silane and the permeability coefficient of concrete. The permeability coefficient of concrete is not a constant and effected by cement types and water cement ratios, which is positively relation to the water cement ratio. The permeability coefficient of concrete cannot be used as a nondestructive measure method to calculate the penetrating depth of silane. The penetrating process of silane in concrete may not meet Darcy's law. The pore structure of concrete is complicated which is not a simple cylindrical pore. The pore structure of concrete and the pore structure of hardened cement paste are different. There are many factors affecting the pore structure of concrete. The water cement ratio and the aggregate diameter influence the porosity and permeability of concrete.
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