Evaluation of Hydrophobic Performance of Silane Impregnated Concretes
Yoshimori KUBO, Yuzuru TAMAI, Atsushi HATTORI and Toyoaki MIYAGAWA
Abstract:From the viewpoint of deterioration mechanism of concrete structures, water is one of the most important factors. If water vapour permeability is required to control water content of concrete structures, silane surface treatment is typical hydrophobic surface treatment which restricts water penetration into concrete, but allows water vapour to move out. In this study, the influence of molecular structure of solvent-free silanes with various application rate and water content of concrete on the hydrophobic performance was investigated. As results, the influence of molecular weight of solvent-free silane and water content of concrete was cleared. Hydrophobicity of concrete is influenced by impregnation preformance which depends on molecular structure of silane. In the repair of existing concrete structures, silane with large alkyl size which has much better good impregnation performance are expected to have best performance. Key Words:Molecular structure, Application rate, Water content of concrete, Silane, Hydrophobic performance, Surface treatment