Prospecção de corrosão microbiana em concreto armado na presença e ausência de salinidade.

Abstract

Concrete has coarse and fine aggregates in its composition and can be reinforced with steel bars; thus, it is called reinforced concrete. It was believed that concrete was indestructible, however, over the years, it was realized that aggressive agents present in the atmospHere attacked the structures, corroding the reinforcement and causing several problems in constructions. It was discovered that bacteria also have the ability to corrode metal alloys through a process called microbially induced corrosion (MIC). Sulfate-reducing, sulfur-oxidizing, iron-oxidizing and nitrate-reducing bacteria stand out in biocorrosion research. In this sense, we present the bacteria of the Bacillus group, which can be found in the most varied environments, Bacillus subtilis and Bacillus cereus, which have several studies in the literature demonstrating their corrosive potential. Both are bacteria that precipitate calcium carbonate (CaCo3) and for this reason are used in self-healing concrete. However, there are no studies investigating the possibility of these bacteria inducing corrosion in steel bars in reinforced concrete in a saline environment, which opens the way for this investigation and prospecting.