Efficiency of Galvanized Steel Embedded in Concrete Previously Contaminated with 2, 3 and 4% of NaCl

摘要

The results are reported from the evaluation of corrosion rate of galvanized steel embedded in concretespecimens contaminated with different concentrations of NaCl and exposed to a simulated marineenvironment for a period of 320 days to compare their efficiency with steel-1018 used worldwide. Themixture was designed according to the standard ACI 211.1 considering a resistance of 250kg/cm at 28days. Was evaluated the potential corrosion (ASTM C 876-99 standard) and corrosion rate with theelectrochemical technique of linear polarization resistance (LPR). The results show a significantprotection against the corrosion of galvanized steel bars after 138 days of exposure when is embeddedin an uncontaminated concrete. Was observed that in contaminated concretes the performance ofgalvanized as protection against corrosion is not efficient; is only a viable option to increase theservice life of concrete structures with their respective limitations.