Accelerated Corrosion and Repair of Reinforced Concrete Columns Using CFRP Sheets

grantor: University of TorontoThis work presents the results of an experimental study involving large-scale reinforced columns which were corroded under an accelerated corrosion regime, repaired using carbon fibre reinforced plastic (CFRP) sheets, then tested to failure in compression. A total of seven columns were constructed: five were subjected to accelerated corrosion and three were repaired. One damaged, one repaired, and a control specimen were tested to structural failure. Cross-sectional cuts were made on a fourth, corrosion-damaged column for observation. The remaining specimens were held over for long-term study. Accelerated corrosion was achieved by adding sodium chloride to the mixing water, applying a current to the reinforcement cage, and subjecting the specimens to cyclic wetting and drying. Presented are conclusions regarding: (1) the optimum accelerated corrosion regime; (2) the effects of corrosion and CFRP repair on the mechanical behaviour of the columns; (3) the relationship between expansion and steel loss; and (4) the integration of fibre optic sensors in monitoring.M.A.Sc