ABSTRACT
To select the appropriate Non-Destructive Testing (NDT) method for repair quality control, the following factors should be taken into account: type and size of defects at the interface zone to be investigated, thickness of overlay, type of repair material, quality of concrete substrate. A majority of NDT methods mentioned in EN 1504-10 and ACI Concrete Repair Manual for assessment of concrete structures are based on propagation of stress waves. In the framework of several project conducted at Warsaw University of Technology in cooperation with the University of Liege various repair systems different in concrete surface and interface quality, were tested. An adhesion in repair systems is one of the most important factors that affect the durability of repair. The adhesion depends on many phenomena taking place at interface zone. Repair system is difficult to test with NDT methods because of many factors influencing stress wave propagation.
