The Use of Urea as a Corrosion Inhibitor in Concrete: A Review

Author(s)	Krishna Murari
Country	India
Abstract	Corrosion of reinforcing steel in concrete structures remains a significant challenge, leading to premature deterioration and high repair costs. This review examines the application of urea as a potential corrosion inhibitor in reinforced concrete, drawing from experimental studies on simulated concrete pore solutions and actual concrete mixes. Urea, an organic compound commonly used as a fertilizer, has shown promise in mitigating chloride-induced corrosion through the formation of protective films on steel surfaces. Key findings indicate inhibition efficiencies up to 86% in simulated environments, though results in real concrete are mixed, with some studies reporting reduced penetrability but limited corrosion protection and potential adverse effects on concrete durability, such as decalcification and strength reduction. Mechanisms, effectiveness, limitations, and influences on concrete properties are discussed, highlighting the need for optimized concentrations and further long-term studies.
Keywords	corrosion, concrete, inhibitor
Field	Engineering
Published In	Volume 8, Issue 2, March-April 2026
Published On	2026-03-27

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