Damage mechanisms anticipated on roads include the following.
- Fatigue
All materials will fail when subjected to cyclic stress, even if the stress is at a level that would not cause failure under static loading. This is called fatigue. - Natural Corrosion
Metals exist on earth as compounds (oxides, sulfides, etc.), but they are reduced (refined, etc.) and used industrially. Therefore, in the natural world environment where oxygen exists, it will return to an oxide. This phenomenon is called natural corrosion. - Wet corrosion
In contrast to dry corrosion, in which the material dissolves in a gas, wet corrosion refers to the solution of the material in a liquid. The degree of corrosion varies depending on the combination of liquid components and materials (including anti-corrosion measures such as coatings).