Investigation of stress corrosion in different classes reinforced concrete

Reinforcing rebars are formed by bending to ensure adherence and placing the suitable position in reinforced concrete elements. During this process, stress occurs on reinforcement rebars. This stress will affect the corrosion mechanism. In this study, stress corrosion in different classes reinforced concrete were searched and also three different bending angles (45, 90, 135°) were used while forming reinforced concrete rebars and stress free situation was considered. 12 mm diameter reinforcement rebars were used in this study. As a reinforced rebar category flat S220, ribbed S420 and tempcore ribbed B500C rebar class were used. Normal concrete which does not contain any mineral additives and additive concrete which contains %25 fly ash substitutions were used. Corrosion process was considered from three different perspectives which are in terms of concrete, in terms of reinforced bars and in terms of reinforced concrete. Fly ash additive caused %4 reduction of concrete strength but it increased corrosion resistance between %20 and %62. If the bending angle increases, the corrosion rate increases. Tempcore ribbed B500C showed the highest corrosion resistance and the lowest corrosion rate behavior in the class of reinforcements rebars.