Abstract
The aim of this paper is to evaluate the possibility of using the nonlinear ultrasonic spectroscopy with a single exciting harmonic frequency for concrete carbonation monitoring. Carbonation of concrete is related with the corrosion of steel reinforcement and with carbonation shrinkage. Due to the conditions in the laboratory were as close as possible to practical terms, we used reinforced concrete samples. For the research, the concrete beams with one standard reinforcing bar passing through the centre of the sample were made. Prepared samples were exposed to an atmosphere with increased carbon dioxide content. The measurements using the nonlinear ultrasonic spectroscopy with a single exciting harmonic frequency were realized before and after carbonation of concrete.
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