CORROSION OF REINFORCEMENT IN CONCRETE REPAIR

Abstract For a satisfactory patch repair to a concrete structural element the prevention of reinforcement against further corrosion is an important consideration. Therefore, the performance of a repair mortar and reinforcement coating in protecting the reinforcement against further corrosion may need to be considered in the selection of a repair system. An experimental investigation was designed to provide comparative data on the performance of five repair materials in preventing corrosion of both coated and uncoated reinforcing bars. A normal outdoor environment in the British Isles and an environment exposed to de-icing salt were considered. Corrosion was assessed by the half-cell potential method and visual examination. The paper discusses how the repair material influence the resistance to corrosion of reinforcement at the interface between the repair material and the surrounding concrete is affected by shrinkage, adhesion and compaction of the repair material. Conclusions and recommendations for corrosion protection are made. These can be used in assessing the suitability of repair materials for any given application.