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Theses

Utilisation d'ondes de surface à l'aide de scanners acoustiques sans contact pour le contrôle non destructif de structures en béton

Abstract : This work proposes a method for the non-destructive testing of concrete for civil engineering structures.This method is based on the emission and reception - when the surface wave has passed through the material - ofacoustic sonic and ultrasonic waves. The waves used in this thesis are surface waves, as they have the property ofpenetrating the material to a depth equal to their wavelength. The auscultation of concrete is done using twoscanners: a first scanner applying this method with high frequency waves was used to characterize the concreteskin, while a second scanner using low frequency waves, developed within the framework of this work, made itpossible to characterize a concrete over the thickness of an entire wall. In order to determine the capabilities andlimitations of this method for the non-destructive testing of concrete, several pathologies or environmentalconditions of concrete were simulated in the laboratory on test specimens. These specimens were then examinednon-destructively with acoustic scanners and destructively with material tests. The pathologies or conditions inquestion were leaching, delamination, micro/macrocracking of the concrete, and its state of saturation. Comparisonof the results allowed us to conclude that this method and these scanners are able to detect and determine the depthof a leaching of concrete, as well as for a delamination within concrete, to follow the evolution of a saturation frontwithin a limestone but not yet within a concrete, and to detect and follow the stress and micro-cracking as well asthe evolution of macro-cracks, in particular thanks to automated measurements carried out in situ on the VeRCoRsstructure.
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https://tel.archives-ouvertes.fr/tel-03200556
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Submitted on : Friday, April 16, 2021 - 4:21:08 PM
Last modification on : Wednesday, March 23, 2022 - 3:51:33 PM
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  • HAL Id : tel-03200556, version 1

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Charles Ciccarone. Utilisation d'ondes de surface à l'aide de scanners acoustiques sans contact pour le contrôle non destructif de structures en béton. Autre. Centrale Lille Institut, 2020. Français. ⟨NNT : 2020CLIL0014⟩. ⟨tel-03200556⟩

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