What is it about?
The deterioration of reinforced concrete structures due to individual chloride and sulfate attack has a different mechanism. Further, in the concomitant presence of chloride and sulfate ions, the mechanism becomes more complex due to the concurrent reaction of both the ions with the hydrated phases of cement. Therefore, from the viewpoint of estimating the service life along with the qualitative and quantitative information required for rehabilitation and maintenance of reinforced structures located in the marine environment the study on chloride-generated rebar corrosion in the concomitant presence of chloride and sulfate ions is important. The exact role of sulfate ions on chloride-generated rebar corrosion in the concomitant presence of chloride and sulfate ions is still unknown and contradicting in the reported research. In this research work, the corrosion performance of embedded rebar in concrete against chloride and combined chloride-sulfate solutions up to exposure periods of 27 months was reported.
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Why is it important?
From the viewpoint of estimating the service life along with the qualitative and quantitative information required for rehabilitation and maintenance of RC structures located in the marine environment, the study on chloride-generated rebar corrosion in concomitant presence of Cl− and SO42− ions is important.
Perspectives
The rapid deterioration of reinforced concrete structures located in marine environment because of chloride-generated corrosion remains a matter of serious concern. The marine environment mainly comprises chloride (Cl−) ions, sodium (Na+) ions, sulfate (SO42−) ions, and magnesium (Mg2+) ions. The existence of SO42− ions with Cl− ions influences the chloride generated corrosion behavior because of the binding of these ions with hydrated C3A in concrete. In this research, an experimental study has been conducted to assess the performance of embedded rebar (carbon steel) against corrosion in normal concrete subjected to chloride (NaCl) and combined chloride-sulfate (NaCl with MgSO4 and NaCl with Na2SO4) solutions for 27 months of exposure periods.
Arya Anuj Jee
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This page is a summary of: Effect of Combined Chloride-Sulfate Solutions and Associated Cation Types with Sulfate Ions on Corrosion Performance of Steel Rebar in Concrete, Advances in Civil Engineering Materials, March 2022, ASTM International,
DOI: 10.1520/acem20210121.
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