Avaliação do teor do íon cloro no ar atmosférico da Praia do Futuro, em Fortaleza, em função da altitude.

Abstract

Reinforced concrete structures, when exposed in marine atmosphere environments, are more susceptible to degradation, as it suffers the deleterious effects of salt spray, composed of chloride ions. These ions, together with the environmental conditions, are responsible, for the most part, for the corrosion of the reinforcement, the most recurrent pathological manifestation in reinforced concrete structures. Praia do Futuro, in Fortaleza, is presented as the place with the strongest salt air in

Brazil (Torres, 2018), a fact that discourages construction and devalues several real estate projects on site. This work aims to evaluate the content of chlorine ions as a function of altitude in this region, since studies involving these variables are scarce and such knowledge will allow the development of more economical and technically feasible reinforced concrete structures projects, due to its better performance in the face of the aggressiveness of the environment. To quantify the content of chloride ions in the atmospheric air, the procedure described in NBR 6211 (ABNT, 2001) was adopted. A building was chosen 850 meters away from the sea and four wet sails were placed, required on the deck (double height), 6 meters high, 4th floor, 12 meters high, 10th floor, 30 meters high, and 16th floor, 48 meters high, where it was exposed for a period of 90 days, being replaced every 30 days. From the results obtained, it was possible to

conclude that there is a high environmental aggressiveness in the low- altitude and obstacle-free regions. However, it was not possible to establish a clear correlation between these variables, since intervening factors, such as wind direction, hindered a more accurate analysis.