What is it about?
This paper evaluates the suitability of various techniques such as half-cell potential, macrocell corrosion, linear polarization resistance, and electrochemical impedance spectroscopy (EIS) to detect corrosion initiation of fusion-bonded-epoxy (FBE) coated steel rebars in concrete. . Then, a new method that uses the properties of epoxy coating, steel-coating interface, and concrete cover to estimate the service life of reinforced concrete systems withFBE coated rebars is demonstrated. Modifications to the existing specifications to achieve target service life are also proposed.
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Why is it important?
Detecting the initiation of corrosion is an important aspect to quantify the chloride threshold of FBE coated steel rebars. Many practitioners use conventional test methods based on HCP, MC, and LPR to detect the initiation of corrosion in RC systems with FBE coated steel rebars. The results presented in this paper indicate that these test methods could not detect the initiation of corrosion in such systems. The proposed test methods based on EIS will enable practitioners to detect the initiation of corrosion in concrete systems with FBE coated steel rebars. The framework will enable engineers to estimate the residual corrosion-free service life, and plan for the repair of such RC systems.
Perspectives
Now, we have test methods to determine the chloride threshold of coated steel rebars and estimate the service life. Let us use them and avoid using poorly coated steel rebars in the construction industry. Together we can build durable concrete structures.
Deepak Kumar Kamde
Indian Institute of Technology Madras
Read the Original
This page is a summary of: Corrosion initiation mechanisms and service life estimation of concrete systems with fusion-bonded-epoxy (FBE) coated steel exposed to chlorides, Construction and Building Materials, March 2021, Elsevier,
DOI: 10.1016/j.conbuildmat.2021.122314.
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