Abstract
This note presents a case study which aimed to identify the environmental effects that may cause or accelerate the corrosion of helical steel piles installed in a typical site of Brazilian unsaturated tropical soil. For this study, an experimental investigation was carried out based on a detailed examination of two helical piles, fabricated with weathering steel, exhumed after approximately 4 years of installation. The pile corrosion was evaluated through qualitative and quantitative interpretations. The results indicate that the corrosiveness increases markedly as the zone of groundwater table fluctuation was approached, and at the top-soil zone, due to the higher oxygen concentration. Insignificant corrosion was detected along the length of pile embedded below the groundwater table. Additionally, the inner surface of the examined closed-end steel pipe piles, which was not in contact with the soil, is much less affected by corrosion compared with the outer surface.
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