Chloride in de-icing and marine slats can quickly reach steel bars in concrete and accelerate corrosion. This corrosion becomes dangerous when it occurs at a single point on the bars, leading to rupture and making the reinforcement ineffective. 2. Carbonation causes a reduction in the high pH of concrete which is the reason for the passivation of steel in concrete. The widening of cracks makes carbonation much faster. 3. When cracks occur and are unrepaired, the concrete's humidity increases, leading to an increase in the corrosion rate of steel bars. In the case of frost, water freezing in cracks widens cracks quickly and causes more severe damage.