Soldier Field Stadium: Corrosion Mitigation for Historic Concrete

Abstract

Demonstrates how new technologies in corrosion mitigation for steel are applied to the preservation of historic concrete structures. The article deals specifically with the Soldier Field Stadium in Chicago, Illinois, constructed between 1922 and 1926. The main challenges to effective preservation of this structure were the high chloride content in the concrete in the coffered ceilings and the deep carbonation in the exhibition-hall concrete. After materials testing, performance trials and cost analyses, the study recommended installing a sacrificial distributed zinc-anode CP (cathodic protection) system throughout the colonnade ceiling beams. Additionally, the most cost-effective repair approach for the exhibition halls called for not installing any corrosion-mitigating measures, but rather continuing with annual inspections and periodic patching of the overhead concrete.