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Monitoring of non-uniform corrosion damage processes in reinforced concrete by distributed fiber optical sensors
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DOI：10.1016/j.istruc.2026.112443.png)
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Abstract
En 中文
The complex and unpredictable nature of rebar non-uniform corrosion, arising from environmental heterogeneity and localized damage, has been historically overlooked due to the lack of real-time, non-destructive monitoring techniques, severely limiting the understanding, prediction, and model validation of corrosion-induced concrete deterioration. This study employs distributed fiber optical sensing (DFOS) with sub-millimeter spatial resolution to monitor corrosion-induced strain evolution in reinforced concrete. Beyond strain detection, the distributed strain field was used to interpret the coupled evolution of apparent corrosion-product filling, corrosion-layer growth, and crack development under different rebar lengths. DFOS measurements successfully captured the corrosion-induced strain, enabling the damage process to be categorized into three distinct stages: (1) initial filling-dominated stage, (2) expansion-dominated stage, and (3) crack-development stage. Increasing rebar length (10 cm to 50 cm) correlated with an increased corrosion product filling rate (0.718–1.176 ×10⁻⁶ mm³/(mm²·h)) but a decreased corrosion layer growth rate (0.02–0.006 cm/year). Cross-sectional corrosion layer distribution shifted from a single-peak to a double-peak normal distribution, indicating heightened non-uniformity with longer rebar. The CV-based crack-development point corresponded to relatively low rebar mass loss rates of 0.27%–0.34%, indicating that detectable surface cracking may occur at an early corrosion stage. This work provides a powerful non-destructive tool for understanding and monitoring rebar non-uniform corrosion induced concrete damage process.
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