Three-dimensional corrosion pit measurement and statistical mechanical degradation analysis of deformed steel bars subjected to accelerated corrosion

This study experimentally investigated the effect of corrosion non-uniformity on the mechanical property degradation of deformed steel bars. Both the average and critical cross-sectional areas were determined using a 3D laser scanner. Tensile test results and statistical analysis showed that both the yield and ultimate loads linearly decreased with an increase of corrosion loss while the elongation and ductility decreased exponentially. Corrosion did not affect the yield and ultimate strength based on the critical cross-sectional area. Mixed brittle and ductile fracture occurred in uncorroded steel bars while brittle fracture initiated at corrosion pits and propagated outwards in corroded steel bars.