Abstract
The main cause of reinforced concrete degradation is the corrosion of reinforcing steel. This paper reports the influence of chloride and sulfate ions on steel reinforcement corrosion. In the present work, concrete specimens were admixed with sodium chloride, sodium sulfate and magnesium sulfate. The concentration of sodium sulfate and magnesium sulfate is fixed at 3 % whereas the concentration of sodium chloride is varied as 3, 5, and 7 %. Tempcore TMT steel, Portland pozzolana cement (PPC) and w/c ratio of 0.5 were used in the present experimental investigation. Concrete powder was obtained by crushing concrete specimens those were admixed with different concentrations of chloride and sulfate ions. The electrochemical behaviour of steel has been evaluated by conducting potentiodynamic polarization study on steel in contaminated concrete powder solution extracts. On the basis of the results obtained, ranges of potential for different zones of corrosion of steel reinforcement in concrete powder solution extracts contaminated with composite chloride and sulfate ions have been obtained.
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