Investigação em estruturas de concretos armado suscetíveis a deterioração por carbonatação em três ambientes distintos estudo de caso.

Abstract

The presented paper proposes a study of investigation on structures of armed concrete susceptible to carbonation. The edifications under study are located on three different environments, that is, in different classes of environmental aggressiveness which allows correlating how the environment exposure conditions of each structure influence the triggering of pathologies in concrete. Buildings located in cities in the State of Paraná with occupation/use time greater than or equal to 5 (five) years were selected, from the date of habitation. The selected buildings were submitted to the carbonation testing with spraying of phenolphthalein solution according to the determinations of EN 14630:2007. According to the report provided by SIMEPAR of the weather stations of each city where the study was carried out, it is possible to quantify the environmental variables that influence directly the carbonation speed (relative humidity, concentration of carbon dioxide in the atmosphere and temperature) in the time interval considered (2016 to 2020). From the study, the effectiveness of a simplified inspection method can be shown by identifying whether the cover of reinforced concrete structures is carbonated and how much of this cover should be recovered in order to prevent the corrosion process of reinforcement; it can also be seen that structures inserted in aggressive environments are more prone to carbonation where the quality of concrete should be decisive to delay advancement as well as aid with the use of organic paints for its protection.