Cathodic Protection For Reinforced Concrete Bridge Piers

Cathodic protection is a common method used to prevent corrosion and preserve reinforced concrete bridge structures. It’s particularly important in areas where chloride exposure is high, like coastal regions.

For existing bridges, cathodic protection should be considered when dealing with severe chloride environments to prevent concrete damage. Even in new constructions, integrating cathodic protection during the build or as part of rehabilitation can significantly extend a structure’s lifespan.

There are two primary methods of cathodic protection for bridges: sacrificial anode and impressed current systems.

Sacrificial anode systems have limitations, especially in their current and voltage output. They may not generate enough energy to protect concrete in high-resistivity environments like atmospheric concrete. However, in environments with seawater exposure, sacrificial anodes can still provide effective protection.

Impressed current systems offer more flexibility because the current output can be adjusted easily. Unlike sacrificial anodes that corrode and require replacement periodically, the anodes in impressed current systems typically have a longer service life.

Implementing cathodic protection on bridges is vital for their longevity and structural integrity. By applying these protective measures, we can minimize the need for extensive repairs and ensure safer infrastructure for the future.