So far water repellent treatment has been very controversial for practical applications. The reason for this is mainly the fact that there is no rational basis for application technologies. Within this project the rate of penetration and the corresponding penetration depth is to be studied as function of the quality of concrete. The aim of the project is to define clear requirements for the application of water repellent agents. A reliable test method is to be developed in order to be able to determine penetration profiles of water repellent agents.

It has been shown so far that the penetration depth of the water repellent treatment is most essential for a long-term performance. Sufficient penetration depth can be achieved only if the surface is in contact with the water repellent agent for a long enough period. Today there are at least 3 alternatives to achieve this aim:

(a) use of a Silane cream,

(2) 5-8 times spraying with an interval after the 2 first treatments,

(3) application of the agent from a box attached to the surface.