Abstract

CONI, Gabriella de Andrade; COSTA, Amanda Tafuri; COSTA, Adriana Gonçalves  and  SAKUMA, Guilherme. Concrete degradation by the formation of biogenic sulfuric acid in a Sewage Pumping Station. Rev. ALCONPAT [online]. 2022, vol.12, n.2, pp.279-295.  Epub Apr 29, 2024. ISSN 2007-6835.  https://doi.org/10.21041/ra.v12i2.571.

This work presents the study carried out in a Sewage Pumping Station after severe degradation was observed. The attack by biogenic sulfuric acid in sanitary sewage systems is widely studied in the literature, however, data on real work situations are still quite limited. Analyzes of the concentration of H 𝟐 𝐒 in the air, carbonation depth, compressive strength, petrography, SEM/EDS, XRD and chemical determinations were carried out in concrete cores extracted above the effluent level. The products identified on the surface were Gypsum, Jarosite, Ferrous Hydroxide, Ferrous Chloride and possibly Hisingerite. The results demonstrate the presence of products on the surface, from the dissolution of cement paste as well as from the 16 mm steel bars located in the attacked region.

Keywords : biogenic sulfuric acid attack; degradation; reinforced concrete.

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