The method is based on the propagation speed of longitudinal ultra-sonic waves inside a reinforced concrete structure. The propagation speeds depends on the characteristics of the material such as elasticity, density, presence of gaps, micro-holes, etc… From the determination of the following parameters: reflection, refraction, transit time (T.O.F.) and mitigation of the vibration energy, it is possible to obtain information on:
- Homogeneity of the mix
- Elasto-mechanical characteristics
- Entity, geometry and location of particular faults or internal defects, variations in time of the quality parameters of the concrete
- Ultra-sonic tests through which it is possible to evaluate the transit speed of the pulses (with known thickness and time) are particularly important.