Evaluation of Migrating Corrosion Inhibitors Used in the Restoration and Repair of Reinforced Concrete Structures

摘要

Corrosion inhibitors used in reinforced concrete structures can greatly increase service life and reduce long term maintenance costs. In this work, migrating corrosion inhibitors have been utilized in the repairs of concrete structures that were deteriorating due to corrosion of embedded reinforcement. These two projects show that migrating inhibitors have a direct and significant impact on the reduction of corrosion. The Randolph Avenue Bridge in Minnesota was repaired using an overlay incorporating a migrating corrosion inhibitor in the westbound lanes. The repair of the eastbound lanes did not contain a corrosion inhibitor. The rehabilitation was part of a Federal Highway Administration project and measurements were also taken as part of a Virginia Tech study. Updated readings were performed in 2000, 2003, 2007, and 2011. The Apple Street Parking Garage in Ohio contained precast double tees that had advanced corrosion which led to full depth concrete repairs. Repairs were completed using concrete that included a migrating corrosion inhibitor, and the application of a penetrating corrosion inhibitor to the rest of the structure. This paper will cover the corrosion rate data collection and present findings, which will include chloride level analysis, half-cell potential readings, concrete resistivity readings, and linear polarization resistance techniques.