ABSTRACT
One of the key areas of development in Non-Destructive Testing (NDT) of concrete in recent years has been in imaging using tomography methods. There is a real need to see the internal structure of the concrete element, be it the reinforcement structure, the location of post-tensioning cables, the presence and extent of delaminations or honeycombing. Ground penetrating radar, eddy current and impact echo instruments have all been used for this purpose. Each technology has its advantages and disadvantages, yet none of them, used independently can provide all of the information required. A combination of instrumentation is necessary to build up a more complete image of the internal structure of the concrete element. Pulse echo technology is an additional string to the bow of the NDT specialist.
