Abstract
In the present paper, a simple model to predict the corrosion rate of steel bars in concrete is developed, considering the influence of the porosity of steel-concrete interfacial zone. Firstly, a model for the porosity of the interfacial zone is developed basing on the water-cement ratio gradient in the interfacial zone. Then the relationship between the porosity of the interfacial zone and the corrosion parameters of the steel bar in concrete is discussed, the anode-cathode ratio for the electrochemical corrosion process, the chloride threshold value and the resistivity of concrete are determined by the porosity of steel-concrete interfacial zone. The corrosion rate of steel bars, which is taken as the corrosion current density, is calculated by considering the cathodic concentration polarization of oxygen diffusion and resistance polarization of concrete, basing on the determined parameters above. Finally, the applicability and efficiency of the corrosion rate prediction model is verified by experiments.
Highlights
Reinforced concrete is the most widely used construction materials in the world
The applicability and efficiency of the corrosion rate prediction model is verified by experiments
The corrosion rate of steel is well related to concrete resistivity and the porosity of steelconcrete interfacial zone, no matter the corrosion is initiated by admixed chloride ions or penetrated chloride ions, this is because the corrosion rate of steel bars in concrete is mainly controlled by two polarization processes: cathodic concentration polarization of oxygen diffusion process and resistance polarization of concrete pore solution, which is mainly determined by the relative humidity of concrete, rather than the chloride penetration process
Summary
Reinforced concrete is the most widely used construction materials in the world. In the service life of reinforced concrete structure, the steel bars embedded in concrete face corrosion problems due to carbonization and chloride ions ingression of concrete, which causes cracking/spalling of concrete cover and strength degradation of the steel bar (Yu et al, 2017). A simple model to predict the corrosion rate of steel bars in concrete is developed, considering the influence of the porosity of steel-concrete interfacial zone.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
