Service Life Prediction of Inhibitors and Concrete Surface Coatings in Concrete-Embedded Reinforcing Steel Corrosion Caused by Chloride

Methods

The half-cell method and the linear polarization resistance method have been used to investigate the corrosion inhibition properties of steel bars embedded in cylindrical concrete specimens with different types of green inhibitors, chemical inhibitors, and surface coatings.

Results

The addition of Calotropis gigantea and Azadirachta indica leaf extracts to fresh concrete demonstrated a positive impact on corrosion resistance with control mixes. The efficiency of corrosion resistance increased with chemical inhibitors and surface coatings. Corrosion resistance has been found to be higher in concrete samples coated with surface coatings. From the results, surface coating has been found to exhibit the highest efficiency than the chemical and green inhibitors.

Conclusion

Overall, the study has demonstrated that, in cases of chloride contamination, surface coatings, particularly polyurethane ones, can provide protection against rebar corrosion. Organic inhibitors have shown promise as non-toxic, environmentally benign substitutes, despite their lower effectiveness.