Pennsylvania bridge becomes first in U.S. for EIT corrosion-detection system

A historic bridge’s replacement in Pennsylvania will be the country’s first project to use an electrically isolated tendon system (EIT), which provides a more efficient way to detect corrosion on post-tension tendons.

EIT technology has been used in Europe and has its first U.S. introduction on the replacement of a 1930’s era bridge between Lehigh and Northampton Counties. The bridge is scheduled to be completed in 2020 at a cost of $33.5 million, according to Northeast Prestressed Products (NPP). NPP manufactured the prestressed beams for the project. The EIT technology can monitor for breeches in the corrosion protection system and can also be used for quality control during construction.