Impact of corrosion on the bonding properties at the concrete-rebar interface in reinforced concrete structures

Corrosion is one of the gravest issues attacking reinforced concrete (RC) structures. Corrosion, which is occasioned by a buildup of chlorides on the rebar; is what leads to pitting corrosion. Its early stages there is not a volume increase, which is why pitting is such a problem, because you can lose cross section with no visible signs at the surface. In addition, the pitting corrosion can lead to a loss of the transversal section of the reinforcing rebars, which in turn can lead to a loss in the load-bearing capacity of the concrete construction. This can lead to a decrease in the adhesion force between the embedding concrete and reinforcing rebars. In this study, we proposed a 3-dimensional concrete sample centered on a bar with an 8-mm in diameter. The principal objective of this work is a simulation of uniform pitting corrosion over the entire area of hollow bars within a concrete block when corrosion attacks the surface layer of rebar. In addition to detecting the extent to which corrosion affects the bond strength between rebar and cover; by adopting different rates of rust. For this simulate our model of uniform corrosion in rebar construction and the behavior of injured specimens, the finite element method is considered for this purpose using Abaqus software.