Corrosion cracking and bond strength modeling for corroded bars in reinforced concrete

A model for the prediction of bond strength is proposed with reference to corroded bars. Different confinement situations are considered, and the role of the interface pressure caused by bar expansion is studied. With reference to the ultimate bond stress (bond ultimate capacity), the model is shown to reproduce some of the most documented test results available in the literature very well, Initial bond increase and the final bond deterioration are also modeled, and the residual bond at corrosion levels beyond cover cracking is shown to remain substantial, on the condition that sufficient confinement is provided by the stirrups. Finally, the model makes it possible to study bond mechanics under both mechanical and environmental actions, as required by, the assessment of safety in existing deteriorated structures.