ABSTRACT
ABSTRACT: In the last time impulse-echo methods were increasingly applied for investigating concrete structures. These methods are developed for existing structures as well as for new structures in the frame of quality assurance. The three echo methods impulse radar, ultrasonic echo and impact echo, based on the penetration of electromagnetic and acoustic waves, are complementary related to the detectability of interfaces, voids and honeycombing and reinforcement. Each of the methods is further developed and leads – together with reconstruction calculations – to a precise image of the inner structure of the concrete element. This is achieved by collecting data along a selected area of the surface and by three-dimensional data evaluation.
