Effect of corrosion on ductility of reinforcing bars

By Yingang Du, L. A. Clark, A. Chan. 2005

298 citations recorded by the source corpus.

An experimental investigation into the effect of corrosion on the ductility of steel reinforcement is reported. Both accelerated and simulated corrosion tests were conducted on bare bars and on bars embedded in concrete. The mechanism and degree of the reduction of ductility of reinforcement due to corrosion were examined. The influence of bar type and diameter on ductility of corroded reinforcement is discussed. The experimental results indicate that, since local attack penetration results in a significant variation of residual cross-section along its length, corrosion significantly reduces ductility of reinforcement. Although the strength ratio, elastic modulus and hardening strain only vary with bar type rather than corrosion level, the elongation, ultimate strain and ductile area of corroded reinforcement reduce much more significantly than do those of their yield and ultimate strengths. There is concern regarding bar ductility since about 10% corrosion may possibly decrease the ultimate strain of reinforcement below the minimum requirement specified in CEB Model Code 90 for class S reinforcement. Even though the elongation, ultimate strength and ductile area parameter of corroded small diameter and/or plain bars reduce more than those of large diameter and/or ribbed ones, such differences are not significant and can be neglected. Finally, a set of simple empirical equations is proposed to assess the ductility of corroded reinforcement in practice.

Subfields: Building and Construction, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/6db0b9e6369c76b4d5dd81a8a725719f2c17abf4

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In Building and Construction

In Civil and Structural Engineering

In Materials Chemistry

Citations in the corpus

Pitting corrosion and structural reliability of corroding RC structures: Experimental data and probabilistic analysis (2008, unknown): “These differences could be due to differences in experimental techniques [16].”
Chloride-induced corrosion of steel reinforcement – Mechanical performance and pit depth analysis (2013, background): “Recently [22–24,26–28], it was demonstrated that steel bars subjected to corrosion (salt-spray) may suffer a relatively modest loss of strength but a significant loss of ductility.”
Phenomenological hysteretic model for corroded reinforcing bars including inelastic buckling and low-cycle fatigue degradation (2015, methodology): “In this section the proposed methodology suggested by [41, 42] is adopted to account for the influence of pitting corrosion on the stress-strain behaviour of reinforcing bars in tension.”
Three-dimensional corrosion pit measurement and statistical mechanical degradation analysis of deformed steel bars subjected to accelerated corrosion (2014, background): “Several indices have been introduced to quantify the ductility of a steel bar, such as the ultimate-to-yield load ratio and the ultimate-to-yield strain ratio [28].”