Impact Echo Test
Test Procedures
- Set up the equipment as shown.
- A short-duration mechanical impact, produced by tapping a small steel sphere against a concrete or masonry surface.
- A low-frequency stress waves that generates propagate into the structure and are reflected by flaws and/or external surfaces.
- Surface displacements caused by reflections of these waves are recorded by a transducer, located adjacent to the impact.
- The resulting displacement versus time signals are transformed into the structure and are reflected by flaws and/or external surfaces
- The resulting displacement versus time signals are transformed into the frequency domain, and plots of amplitude versus frequency (spectra) are obtained.
Amplitude Spectrum of Sound Concrete Slab
Amplitude Spectrum of Flawed Concrete Slab