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<p>Corrosion of reinforcement bars compromises the durability of reinforced concrete structures by deteriorating their mechanical properties. This study examines the effects of uniform corrosion on TMT bars (grades Fe 500D, Fe 550D, and Fe 550SD) with diameters ranging from 10 to 25&#xa0;mm using an&#xa0;accelerated corrosion method. Corrosion-induced mass loss, changes in cross-sectional area, and surface morphology are evaluated using gravimetric measurements and 3D scanning technique. Further, the depth-wise influence of microstructural layers on mechanical properties of rebar is analyzed. Tensile tests show that yield and ultimate strength are strongly dependent on mass loss, while strain capacity is governed by cross-sectional heterogeneity. Notably, 25&#xa0;mm bars exhibit significantly higher heterogeneity compared to smaller diameters. Degradation equations are developed to relate the yield strength, ultimate strength, and ultimate strain of corroded bars to mass loss and cross-sectional area reduction. Yield and ultimate strength exhibit a strong linear correlation with both parameters, while ultimate strain decreases exponentially, showing a stronger correlation with critical cross-sectional area loss. The developed degradation models based on mass loss and critical cross-sectional area loss, address limitations of previous studies and provide improved general and diameter specific reduction factors.</p>

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Effect of corrosion on TMT bars: three-dimensional scanning and statistical analysis of mechanical degradation

  • 期刊论文

  • 发表日期：

    2025年10月26日

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  • Lalhmangaihzuali Khuptong,
  • P. C. Ashwin Kumar,
  • Umesh Kumar Sharma

摘要

Corrosion of reinforcement bars compromises the durability of reinforced concrete structures by deteriorating their mechanical properties. This study examines the effects of uniform corrosion on TMT bars (grades Fe 500D, Fe 550D, and Fe 550SD) with diameters ranging from 10 to 25 mm using an accelerated corrosion method. Corrosion-induced mass loss, changes in cross-sectional area, and surface morphology are evaluated using gravimetric measurements and 3D scanning technique. Further, the depth-wise influence of microstructural layers on mechanical properties of rebar is analyzed. Tensile tests show that yield and ultimate strength are strongly dependent on mass loss, while strain capacity is governed by cross-sectional heterogeneity. Notably, 25 mm bars exhibit significantly higher heterogeneity compared to smaller diameters. Degradation equations are developed to relate the yield strength, ultimate strength, and ultimate strain of corroded bars to mass loss and cross-sectional area reduction. Yield and ultimate strength exhibit a strong linear correlation with both parameters, while ultimate strain decreases exponentially, showing a stronger correlation with critical cross-sectional area loss. The developed degradation models based on mass loss and critical cross-sectional area loss, address limitations of previous studies and provide improved general and diameter specific reduction factors.