Journal:Corrosion Science

Key Words:Reinforced concrete (RC) structures in coastal regions are vulnerable to chloride-induced steel reinforcement corrosion. The resulting non-uniform corrosion morphology, characterized by localized pitting, not only degrades mechanical properties but also introduces significant randomness into the degradation behavior of reinforcing bars. To investigate these effects, 80 deformed reinforcing bars with varying corrosion ratios and diameters were prepared using an electrochemical accelerated corrosion method. Three-dimensional (3D) scanning was employed to quantify corrosion morphology parameters, followed by statistical analysis. Monotonic tensile tests were then conducted, and full-field strain obtained from digital image correlation (DIC) were used to investigate the effects of corrosion morphology on the mechanical degradation. Results indicate that the residual cross-sectional area of corroded steel bars (CSB) follows a lognormal distribution, whereas the corrosion non-uniformity coefficient follows a Gumbel distribution, with distribution parameters dependent on average cross-sectional corrosion ratio and bar diameter. With increasing average cross-sectional corrosion ratio, the nominal strength and strain decrease significantly. The degradation in strain capacity is more pronounced than that in strength, and the yield plateau progressively shortens and eventually disappears at a critical average cross-sectional corrosion ratio of approximately 30.2%. Accordingly, a stochastic tensile constitutive model for CSB was then established and validated using ABAQUS finite element simulations, providing a basis for life-cycle reliability assessment of RC structures.

Indexed by:Journal paper

Page Number:2026,272:114212

Translation or Not:no

Included Journals:SCI

First Author:陈潮航

Co-author:刘阳,何宝睿,郭子雄,叶勇

Correspondence Author:刘小娟