Abstract
The carbonation process in concrete is due to the interaction of the cement paste with atmospheric carbon dioxide modifying the cementitious matrix microstructure and its elastic properties, affecting its durability as a result of formed microcracks and chips within the concrete structure. The effects of this chemical reaction can be monitored using ultrasonic non destructive technique based on the scattering of the incident pulse. Acoustic phase velocity analysis was carried out on acquired signals coming from cement paste specimens of different water-cement ratios, during controlled carbonation process. The results show that the acoustic dispersion increases as a function of CO2 exposition time, where the microstructure of 0.6 water-cement ratio probes react faster to the carbonation. These results are in accordance with the experimental carbonation index, obtained by the well known Fourier Transform Infrared Spectroscopy technique.
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