ABSTRACT
Steel embedded in concrete is normally in a passive state against corrosion due to a thin iron oxide layer that forms on the steel surface and remains stable in the highly alkaline environment of the concrete. For the initiation of corrosion, this protective film can be destroyed (i.e., de-passivated) and this can be mainly done by the presence of chlorides or by carbonation of the cover concrete (Söylev et al., 2008). The use of corrosion inhibiting admixtures has grown over the last 25 years because they provide a level of protection and longevity that would be too expensive to achieve otherwise (Chen et al., 2010).
