Reinforcement corrosion in principle is due by the slurry pH of concrete pores reduction and the presence of oxygen.

Time of occurrence of the phenomenon, as an effect on the strength characteristics, is in principle at least two years. If in the natural corrosion, the elements of monolithic concrete bear the blame is on the coverage with concrete for the reinforcement, at the precast concrete, corrosion may occur mainly due to chloride ions contained in concrete. Can be taken into account other possible causes, related to the concentration of static or dynamic external loads on the elements, the presence of lime in the concrete repair compositions or dispersion currents. Whatever the cause, the phenomena must be known and kept under control at least as concrete elements containing highly corroded reinforcement that are not apparent, can suffer significant degradation (up to collapse) in during exceptional applied loads. However, knowledge deployment of reinforcement corrosion processes contributes to improving the control of reinforced concrete, to prevent and reduce destruction.