Defective bridge joints were allowing chloride contaminated water to leak onto the upper surface of the supporting nib of the bridge’s half joint. The managing agents were concerned about the condition of the reinforcement in the joint.
There was an understandable need to protect the reinforcement in the half joint, but as the joint could only be accessed from the top side, this could only be undertaken during a road closure.
Topbond was appointed to carry out a major concrete repair scheme to the beams and soffit of the deck. Part of the works included the renewal of the deck joint and Topbond took advantage of this to install a string of special protector joint hybrid anodes into the upper portion of the half joint. The anodes were connected to the deck reinforcement and a junction box was provided to allow future monitoring of the system. This is the first time such an anode has been installed in a half joint and consequently is a world first for Topbond.