This paper introduces a mechanistic corrosion model that simulates rebar corrosion in cracked concrete under complex, non-uniform environmental conditions. Leveraging advanced numerical modeling and experimental validation, the study analyzes the corrosion mechanisms, which reveals that self-healing is the key differentiator between the behavior of thin versus wide cracks. By isolating individual mechanisms, this work not only resolves a longstanding experimental debate but also establishes a method to determine the “critical crack width” threshold, beyond which reinforcement corrosion becomes a significant concern.

This research explores the combined effects of chloride ions, carbonation, and relative humidity on rebar corrosion in mortar. It reveals how these factors influence the volumetric water content and resistivity of mortar, resulting in complex corrosion behavior. The study emphasizes the importance of considering these interactions for accurate corrosion prediction and enhanced durability of reinforced concrete structures.

This study used a 3-D transport model to analyze corrosion in an old arch bridge’s reinforcement under carbonation and chloride attack, factoring in realistic microclimates. Field data on oxygen, moisture, chloride, and carbonation levels informed the analysis. Findings show varying corrosion rates due to environmental factors, highlighting the need for diverse maintenance strategies according to climate scenarios.