Electrochemical Corrosion Behavior of Carbon Steel Reinforcement in Concrete Containing Limestone and Mesoporous Silica Nanoparticles under Acidic Environment

摘要

In this study, corrosion behavior of carbon steel rebar embedded in concrete structures containingLimestone and mesoporous silica nanoparticles (MSNs) as partial replacement materials of Portlandcement (PC) in 5% sulfuric acid solution were investigated. Polarization analysis, electrochemicalimpedance spectroscopy (EIS) measurement, water absorption test and mass loss evaluation wereutilized to investigate the corrosion resistance of carbon steel rebars. The concrete sample containingboth limestone and MSNs admixtures (10M10L) indicated a lower value of mass loss for carbon steelrebar than the other samples which caused superior corrosion behavior of steel reinforced concrete.The 10M10L concrete sample shows a considerable reduction in water absorption. The passive currentdensity in the 10M10L sample was lower compared to the other samples, indicating the enhancedcorrosion resistance of carbon steel reinforced concrete containing both MSNs and limestoneadmixtures. The EIS result reveals that the 10M10L sample indicates a significant improvement inpolarization resistance value showing a higher corrosion resistance compared to the other samples.