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Ultrasonic diagnostics of mechanical and structural degradation of concrete

Abstract : The present work concerns the development of tools for non-destructive and non-contact diagnostic of state (degradation) of construction materials, mainly concrete. Attention is focused on two complementary techniques using the propagation of ultrasonic waves, i.e. the study of surface waves propagation and the analysis of reflection coefficients as a function of incidence angle (reflectometry). The theoretical part of the thesis shows the foundations of modelling the considered phenomena, as well as the implementation of the described models in solving the inverse problems. Software developed for this work uses optimization algorithms for identification of model parameters based on the measurement data. The chapters concerning the experimental work shows the construction of two measurement systems developed according to assumptions, including their possible use in both laboratory and field conditions. Applications of the developed diagnostic tools are discussed based on the examples of the results obtained in the laboratory and for the real objects. They allow to specify the parameters such as the depth of degradation, velocity of surface and S-waves as functions of the depth for the tested material and surface permeability, porosity and tortuosity of tested material.
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  • HAL Id : tel-00664281, version 1

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Pawel Safinowski. Ultrasonic diagnostics of mechanical and structural degradation of concrete. Other. Ecole Centrale de Lille; Kazimierz Wielki University. Institute of Mechanics and Applied Computer Science, Bydgoszcz (Pologne), 2011. English. ⟨NNT : 2011ECLI0023⟩. ⟨tel-00664281⟩

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