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Detection of chemical damage in concrete using ultrasound

type de publication      article in an international journal with refereeing comitee
date de publication 2002
auteur(s) Ould Naffa S.; Goueygou Marc; Piwakowski Bogdan; Buyle-Bodin François
journal Ultrasonics
volume (numéro) 40 (1-8)
  
pages 247 – 251
résumé This research deals with a non-destructive method for characterizing the degraded cover of concrete structures using high-frequency ultrasound (0.5–1 MHz). Although such a frequency range is unusual in civil engineering, it is well suited to the kind of defect to be detected, as it corresponds to a thin near-to-surface layer with increased porosity and density of microcracks. In order to assess the feasibility of detecting concrete cover degradation, velocity and attenuation measurements were made on both halves of a concrete slab. One half was immersed into an acid solution for 15–45 days, while the other half remained sound. These measurements were made for longitudinal, transverse and surface waves. The results obtained show a 23% decrease of ultrasonic pulse velocity and a 1000% increase of attenuation in the degraded material relative to the sound material. It is thus possible to detect and characterize concrete cover degradation using high-frequency ultrasound. Although attenuation measurements in heterogeneous media are difficult, their sensitivity to degradation is very high.
mots clés Concrete; Degradation; High-frequency ultrasound; Ultrasonic pulse velocity; Attenuation measurement
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