What is a common indicator of corrosion in steel bridges?

Rust formation on the surface is a well-known and direct indicator of corrosion in steel bridges. Steel, when exposed to moisture, oxygen, and other environmental factors, undergoes a chemical reaction known as oxidation, leading to the formation of rust, which is primarily iron oxide. The presence of rust is a clear signal that the protective coatings or galvanization on the steel have been compromised, allowing for corrosion to take hold.

Corrosion can weaken the structural integrity of steel components, making it imperative for inspectors to look for signs of rust during evaluations. Addressing rust early can prevent further deterioration and extend the lifespan of the bridge.

Although crumbling concrete, discoloration of the steel, and excessive vibrations can indicate other maintenance or structural issues, they are not as directly linked to the corrosion of steel components as rust formation is. Each of these other factors can arise from a variety of causes, making rust formation the most straightforward and visible sign of corrosion in steel bridges.