Spatial characteristics of stray current corrosion of reinforcing bars in pseudo concrete

Abstract

This paper focuses on the spatial characteristics of reinforcing‐bars corrosion under stray current. In the study, a corrosion experiment using a specimen with three steel bars embedded in pseudo concrete was carried out, the distribution of corrosion was obtained by three‐dimensional scanning. Further, a numerical model with the same dimension of the specimen was simulated to explain experimental results. The distribution of electric field driven by stray current was discussed in detail. Results show that by observation through the transparent matrix and by three‐dimensional scanning, the distribution of corrosion could be estimated qualitatively and quantitatively. Additionally, the spatial characteristics of corrosion state under stray current could be realized by the numerical simulation which combines polarization reaction with an extra stray current field. The stray current field around reinforcing bars was uneven in the cross‐sectional plane, leading to the difference of corrosion rate, which reflects the strong positive correlation between the field and corrosion rate.

Tensile behaviour of pitting corroded steel bars: Laboratory investigation and probabilistic-based analysis

“…However, corroded steel bar samples extracted from structures that have been in service for decades showed a mixed morphology with a combination of uniform and pitting corrosions [16,21]. In fact, this mixed pattern of corrosion is common in real RC structures [31][32][33][34][35]. Many studies have proven that the localised corrosion pattern of steel bars is a more critical and hazardous scenario than uniform corrosion [36,37].…”

Assessment of interference scope induced by stray current in the metro depot for the corrosion risk of buried metal pipeline

“…As shown in Fig. 1, the flow of stray current not only puts the metal structures inside the subway system at corrosion risk, but also threatens the safe service of buried metal structure outside the system [6]. Hence, an interference scope affected by stray current corrosion is formed underground.…”