Title:
Evaluation of Different Migratory Corrosion Inhibitors as Repair Strategy for Reinforced Concrete
Author(s):
Ashish Kumar Tiwari, Purnima Dogra, Shweta Goyal, and Vijay Luxami
Publication:
Materials Journal
Volume:
122
Issue:
4
Appears on pages(s):
29-44
Keywords:
carbonation; chloride; corrosion; corrosion inhibitors; fly ash-blended cement; repair strategy
DOI:
10.14359/51746804
Date:
7/1/2025
Abstract:
This research establishes a systematic methodology for selectinga migratory corrosion inhibitor (M-CoI) as a repair strategy forreinforced concrete (RC) structures exposed to aggressive environments. Conducted in two phases, Phase 1 involves corrosion testing in pore solutions to evaluate inhibitor efficacy, while Phase 2 examines the percolation ability of M-CoIs in different concrete systems and performance of M-CoI in RC with corroded reinforcing bars. The findings reveal that the efficiency of the compounds as repair measures is significantly lower than their preventive performance, primarily due to the presence of corrosion products onthe steel surface. Additionally, the effectiveness of the M-CoIs isinfluenced by their concentration and form at the reinforcing barlevel; specifically, 4-Aminobenzoic acid (ABA) achieved maximumconcentration in its purest form, whereas Salicylaldehyde (SA) and2-Aminopyridine (AP) reached the reinforcing bar in lower concentrations. Importantly, the study highlights that compounds effective in pore solution may not perform well in concrete, underscoring the necessity of considering the intended application—preventive or repair—when selecting inhibitors. Thus, a comprehensive approach involving both pore solution testing and migration ability assessments is essential for optimal corrosion protection in reinforced concrete.