NACE Certified Engineers

Protecting & Restoring the 90-Year-old State capitol building

Concrete serves as a base for terra cotta panels. Spalling, corrosion, efflorescence, and other problems are occurring in the steel reinforced concrete in interior portions of the dome, which is shrouded with an exterior copper roof. As a first step in the selection and specification of a cathodic protection method to be employed in the dome renovation, an on-site corrosion survey and audit of the interior of the dome was conducted. Electrical potential measurements showed the active corrosion of the rebar in many locations. However, continuity testing for the rebar was positive, meaning that a cathodic protection system is viable for this structure.