Corrosion Protection Techniques for Reinforced Concrete Systems
Summary
Reinforced concrete remains the backbone of modern infrastructure, yet the embedded steel is prone to corrosion once the alkaline environment is compromised by chloride ingress or carbon dioxide diffusion. Protection strategies span from intrinsic measures—optimising concrete mix design with low permeability, supplementary cementitious materials and corrosion inhibitors—to extrinsic approaches such as surface treatments and electrochemical systems. Common surface treatments include epoxy and cement‐based coatings, galvanisation and powder metallurgy claddings, which create physical barriers to aggressive agents. Electrochemical methods, notably cathodic protection (both impressed current and sacrificial anode systems), actively suppress anodic dissolution of steel. Advances in self‐healing coatings and smart sensor integration enable real‐time monitoring of corrosive processes, thereby extending service life and minimising life‐cycle costs. Material innovations, such as fibre‐reinforced polymer bars and stainless‐clad reinforcements, offer alternative reinforcement options in highly aggressive environments. All techniques must be tailored to service conditions, economic constraints and sustainability considerations to ensure global resilience of concrete assets.
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Corrosion Protection Techniques for Reinforced Concrete Systems publication trend
The graph below shows the total number of articles in corrosion protection techniques for reinforced concrete systems across all publications each year (not limited to Nature Index journals).
Technical terms
Epoxy-coated rebar: Steel reinforcement covered by a thin epoxy film to provide a barrier against moisture and chlorides.
Galvanisation: Application of a zinc layer to steel surfaces to afford sacrificial protection against corrosion.
Cathodic protection: Electrochemical technique that maintains reinforcement as a cathode by supplying current or using sacrificial anodes.
Corrosion inhibitor: Chemical admixture added to concrete to slow steel oxidation by forming protective films or scavenging aggressive ions.
Electrochemical impedance spectroscopy (EIS): Analytical method measuring the impedance of a coated or uncoated metal in solution to characterise corrosion kinetics.
References
- Anti-Corrosion Reinforcements Using Coating Technologies—A Review. Polymers (2022).
- Study on Polymer Modified Cement‐Based Coating with Healing Effect on Rusty Carbon Steel. International Journal of Corrosion (2014).
- Corrosion Experimental Research on Local Damage of Epoxy-Coated Steel Bars in Concrete Under Marine Environment. Frontiers in Materials (2022).
- Chloride Resistance of Assembled Bridge Piers Reinforced with Epoxy-Coated Steel Bars. Applied Sciences (2024).
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