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51312-01420-Evaluation of Migrating Corrosion Inhibitors Used in the Restoration and Repair of Reinforced Concre

Picture for Evaluation of Migrating Corrosion Inhibitors Used in the Restoration and Repair of Reinforced Concre
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Product Number: 51312-01420-SG
ISBN: 01420 2012 CP
Author: Matthew S. Drew
Publication Date: 2012
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Corrosion inhibitors used in reinforced concrete structures can greatly increase service life and reduce long term maintenance costs. In this work migrating corrosion inhibitors (MCI) have been utilized in the repairs of concrete structures that were deteriorating due to corrosion of embedded reinforcement. Both studies show corrosion rate reduction after the application of migrating corrosion inhibitors. The top deck of the Randolph Avenue Bridge in Saint Paul MN was repaired in 1986 using a low slump dense overlay incorporating a migrating corrosion inhibitor admixture. The rehabilitation of this bridge was part of a Federal Highway Administration Project from 1986 to 1990 and a Virginia Tech Study in 1991 and 1992. Updated readings were performed by Cortec in 2000 and 2007 and by Minnesota DOT in 2003. A new set of data being collected in the summer of 2011 will be presented along with historical data. The Apple Street Parking Garage in Dayton OH is a pre-topped precast double tee garage where the underlying precast double tees had advanced corrosion which lead to necessary full depth repairs of the concrete. Repairs were completed using ready mix concrete that included a migrating corrosion inhibitor admixture. Surface treatments were also made to existing concrete outside of the patchwork using a penetrating corrosion inhibitor. This paper will cover the corrosion rate data collection and present findings versus a control which will include chloride level analysis half-cell potential readings concrete resistivity readings and linear polarization resistance techniques.
Corrosion inhibitors used in reinforced concrete structures can greatly increase service life and reduce long term maintenance costs. In this work migrating corrosion inhibitors (MCI) have been utilized in the repairs of concrete structures that were deteriorating due to corrosion of embedded reinforcement. Both studies show corrosion rate reduction after the application of migrating corrosion inhibitors. The top deck of the Randolph Avenue Bridge in Saint Paul MN was repaired in 1986 using a low slump dense overlay incorporating a migrating corrosion inhibitor admixture. The rehabilitation of this bridge was part of a Federal Highway Administration Project from 1986 to 1990 and a Virginia Tech Study in 1991 and 1992. Updated readings were performed by Cortec in 2000 and 2007 and by Minnesota DOT in 2003. A new set of data being collected in the summer of 2011 will be presented along with historical data. The Apple Street Parking Garage in Dayton OH is a pre-topped precast double tee garage where the underlying precast double tees had advanced corrosion which lead to necessary full depth repairs of the concrete. Repairs were completed using ready mix concrete that included a migrating corrosion inhibitor admixture. Surface treatments were also made to existing concrete outside of the patchwork using a penetrating corrosion inhibitor. This paper will cover the corrosion rate data collection and present findings versus a control which will include chloride level analysis half-cell potential readings concrete resistivity readings and linear polarization resistance techniques.
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