Residual Engineering Properties of Corroded Conventional Steel, High Chromium Steel and Stainless Steel Reinforcing bars in Concrete

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Corrosion can be a major concern in term of durability and the safety of the reinforced concrete structures. However, there are no relations specified by codes and standards to evaluate the reduction in the engineering properties of corroded steel rebar. This work presents the findings of the experimental study of the effect of corrosion on the engineering properties of conventional and common resistant corrosion steel rebar that are commonly used in reinforced concrete structures. Sets of tensile strength tests are carried out to evaluate the residual engineering properties namely; yield strength, ultimate strength, and ductility of embedded steel reinforcement subjected to accelerated corrosion. The experimental work comprised of testing three types of steel rebar- mild steel (MS), high chromium (HC) and stainless steel (SS), with two rebar sizes (No. 3 and No. 4), and for 1%-17% mass loss range. Results from the tests indicate that the yield strength, ultimate strength and ductility of steel reinforcement decreases significantly with the increase of mass loss levels, however, rebar size has a slight effect on these reductions. In addition, mass loss level due to corrosion is utilized to predict the reduction of yield and ultimate strength, while both mass loss and pitting factor play a crucial role in the ductility of the corroded rebar. Furthermore, the test results were utilized to propose a set of simple empirical equations to predict the residual strengths and ductility of the corroded steel rebars subjected to accelerated corrosion, which could also be used to evaluate the residual responses of corroded reinforcement in reinforced concrete structures in practice.

Residual engineering properties, Ductility, Mass loss, Pitting factor, High chromium steel, Stainless steel