IMPACT-ECHO

Impact-Echo technique involves introducing mechanical energy, in the form of a short pulse, into a concrete member. Reflected stress waves are monitored by a sensor and are transformed into a frequency domain using a Fast Fourier method. The resulting amplitude spectrum is used for identifying dominant frequencies to determine the condition of the concrete.

The tests are used to determine thickness and to locate internal flaws such as cracks, voids, honeycombing, etc. The tests are conducted very quickly and they need an access from one side of the structure only. The tests have been conducted on a variety of structures such as bridges, buildings, tunnels, parking garages, treatment plants, etc.

Evaluation of Concrete Columns
Office Building, San Francisco

Evaluation of Post-tensioned Roof Slab
Office Building, San Francisco

Impact-echo Testing of the Stone Masonry

Impact-echo Testing of the Aeration Basin Walls
Wastewater Treatment Plant, California