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03286 LONG-TERM EFFECTIVENESS OF CORROSION INHIBITORS USED IN REPAIR OF REINFORCED CONCRETE BRIDGE COMPONENTS

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Product Number: 51300-03286-SG
ISBN: 03286 2003 CP
Author: Ali Akbar Sohanghpurwala
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The primary goal of this study was to determine the effectiveness of migrating amine based organic and calcium nitrite based inorganic inhibitors in mitigating corrosion though a long-term (5 year) study. The inhibitors had been used in the repair of substructure and superstructure elements of four bridge structures during the SHRP field validation study. The bridge structures were located in the states of New York, Pennsylvania, Washington, and Minnesota. In each structure different methods of repair and/or application of corrosion inhibitors were used. The inhibitors were used as admixtures to Portland cement concrete or shotcrete and in some instances also spray applied either on the surface of the reinforcing steel or to both the reinforcing steel and the concrete surface in the repair area. Monitoring of the corrosion condition of the repair and control areas was performed for up to 4 to 6 years after the inhibitors had been used in the repair. Visual, delamination,cover, and half-cell potential surveys, corrosion rate measurements, and chloride ion content analyses were regularly performed to monitor the condition of the repair areas, the interface between the repair area and the original concrete, and the original concrete. In three of the four bridge structures, the corrosion condition of the repair areas treated with corrosion inhibitors was not noticeably different from the repairs performed without any corrosion inhibitors. In areas containing sufficient quantities of chloride ions, corrosion initiated and was sustained despite the presence of the corrosion inhibitors in the repair area. In the fourth structure, sufficient quantities of chloride ions were not present to initiate corrosion and therefore the effectiveness of the inhibitors could not be evaluated.
The primary goal of this study was to determine the effectiveness of migrating amine based organic and calcium nitrite based inorganic inhibitors in mitigating corrosion though a long-term (5 year) study. The inhibitors had been used in the repair of substructure and superstructure elements of four bridge structures during the SHRP field validation study. The bridge structures were located in the states of New York, Pennsylvania, Washington, and Minnesota. In each structure different methods of repair and/or application of corrosion inhibitors were used. The inhibitors were used as admixtures to Portland cement concrete or shotcrete and in some instances also spray applied either on the surface of the reinforcing steel or to both the reinforcing steel and the concrete surface in the repair area. Monitoring of the corrosion condition of the repair and control areas was performed for up to 4 to 6 years after the inhibitors had been used in the repair. Visual, delamination,cover, and half-cell potential surveys, corrosion rate measurements, and chloride ion content analyses were regularly performed to monitor the condition of the repair areas, the interface between the repair area and the original concrete, and the original concrete. In three of the four bridge structures, the corrosion condition of the repair areas treated with corrosion inhibitors was not noticeably different from the repairs performed without any corrosion inhibitors. In areas containing sufficient quantities of chloride ions, corrosion initiated and was sustained despite the presence of the corrosion inhibitors in the repair area. In the fourth structure, sufficient quantities of chloride ions were not present to initiate corrosion and therefore the effectiveness of the inhibitors could not be evaluated.
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