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The impact-echo response of concrete plates containing delaminations: numerical, experimental and field studies

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Abstract

This paper describes the use of the impact-echo technique— a non-destructive testing technique based on the use of transient stress waves— for detecting delaminations in concrete plate-like structures such as bridge decks, slabs, and walls. Results obtained from numerical (finite element) analysis and controlled-flaw laboratory studies are presented and used to explain the elastic impact response of delaminated plates. Current impact-echo instrumentation is described, and results obtained from concrete bridge decks containing delaminations caused by corrosion of reinforcing steel are presented. These results provide a better understanding of the impact response of delaminated plates.

Resume

On décrit ici l’utilisation de la technique impact-écho-méthode d’essai non destructive basée sur l’utilisation d’ondes de pression acoustique transitoires-pour détecter les clivages dans des plaques de béton, telles que tabliers de pont, poutres et murs. On présente les résultats fournis par les méthodes numériques (élément fini) et l’étude en laboratoire sur éprouvette fissurée témoin, qui sont utilisées pour expliquer la réponse élastique à l’impact des plaques détériorées. On décrit l’appareillage courant et l’on expose les résultats obtenus sur des tabliers de ponts en béton qui présentent des clivages dus à la corrosion de l’armature. Ces résultats contribuent à mieux faire comprendre la réponse à l’impact de plaques détériorées.

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Cheng, C., Sansalone, M. The impact-echo response of concrete plates containing delaminations: numerical, experimental and field studies. Materials and Structures 26, 274–285 (1993). https://doi.org/10.1007/BF02472949

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