Abstract
Concrete aging is a problem that affects more and more service structures. Detailed knowledge of their state is necessary prior to rehabilitation. Sonic tomography, a relatively new, nondestructive global auscultation approach allows to reconstitute the internal image of the structure. Transmitted sonic wave velocity in the material is the parameter considered. The relative variation in wave propagation velocity in the material provides information about changes in the structure, and therefore the state of degradation. Two hydraulic concrete structures were studied. The principle and the experimental procedure of this method are explained. Key words: structure, concrete, degradation, auscultation, nondestructive test, sonic tomography
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