The protecting of concrete, which consists of coating a chemical substance onto concrete's surface, has been applied to architectural conservation. There is increasing interest in studying materials for concrete which can reduce the infiltration of water and salt solutions and rehabilitate and extend its service life. Silicon compounds are frequently used as a base for commercial protecting paint due to their hydrophobicity and penetrability. In this study, concrete was coated with composite of impregnation type consisted of two different silanes and auxiliary entrant to resist the diffusion of water. The properties of concrete coated with impregnation coatings composed of silanes and auxiliary were researched. And the penetrating performance of the composite was also investigated. The coating of composite silane improved the property of concrete.
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