Improved degradation relations for the tensile properties of naturally and artificially corroded steel rebars: Fid-Bau Portal

Improved degradation relations for the tensile properties of naturally and artificially corroded steel rebars

Vanama, Raghava Kumar / Ramakrishnan, Balaji

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Highlights • Tensile properties of naturally corroded round rebars up to 80% mass loss. • Tensile properties of artificially corroded ribbed bare rebars up to 50% mass loss. • The variation in loss of transverse and longitudinal rib with corrosion. • Cross-sectional phase distribution of corroded steel rebars (TM-ring test) • Improved decay laws for tensile properties of corroded rebar (Uniform and Pitting)

Abstract In the present study, the tensile properties of naturally and artificially corroded steel rebars of different grades and diameter are experimentally investigated. Naturally corroded steel round rebars were acquired from 54-year-old inland corridor structure, exposed to carbonation and artificially corroded rebar were obtained by subjecting bare rebars to chloride attack through an impressed current based artificial corrosion. Mass losses were in the range of 0.81% to 79.64% for naturally corroded rebar and 9.95% to 50.51% for artificially corroded rebar. In the case of artificially corroded rebars, variations in rib loss with the level of corrosion were also captured. Effect of corrosion on elastic modulus, ductility, yield and ultimate stresses of naturally and artificially corroded rebar were studied. Based on the tensile test results, degradation equations were formulated to estimate the yield and ultimate stresses of corroded rebar knowing the properties of uncorroded rebar. Finally, proposed equations were validated with the results obtained from the literature study. The comparison revealed that the equations proposed in this study provide improved prediction of yield and ultimate stresses of corroded rebar.