A Study of Accelerated Corrosion Behavior of Protective Coatings on Reinforced Concrete under Chloride Environment

Abstract

This research aims to investigate the corrosion tendency of steel reinforcement in concrete specimens coated with various protective materials under accelerated conditions. The study examines cylindrical reinforced concrete specimens with centrally positioned steel reinforcement, comparing uncoated concrete (control specimens) with concrete coated using three different types of protective materials: cement-based coating, epoxy, and polyurea. In the experimental procedure, test specimens were immersed in a 5% sodium chloride solution and subjected to accelerated corrosion through electrical current application. The specimens were continuously monitored through electrical current measurements passing through the samples, and corrosion tendency was evaluated using the Half-cell potential method, which is internationally recognized as a standard testing procedure. The experiments were conducted under controlled temperature and relative humidity conditions to minimize external environmental influences. Additionally, physical surface characteristics and potential crack development were monitored throughout the testing period to assess the relationship between corrosion progression and structural deterioration. Observations included detailed examination of concrete surface conditions and any cracking that might occur during the testing phase, enabling comprehensive evaluation of the correlation between corrosion development and structural damage. The findings from this study will contribute to the optimal selection of concrete coating materials for reinforced concrete structures exposed to chloride-rich environments. Furthermore, this research will facilitate the development of effective and sustainable corrosion prevention strategies for reinforced concrete structures, ultimately leading to extended service life of structures and reduced long-term maintenance costs.