CP protected area
RSA in the ground behind the listening wall
Cathodic Protection Case Studies
The Listening Mirrors, Kent
Remote Sacrificial Anode for Concrete Reinforcements
The three early warning sound mirrors on the Kent coast were built using reinforced concrete in the late 1920s and the early 1930s to detect the distant sounds of enemy aircraft approaching from over the English Channel. The reinforced concrete has deteriorated in the marine environment and many parts of the structure are suffering from corrosion of the reinforcements and delamination of the concrete cover.
In the latter part of the 20th century, the Listening Mirrors were 'scheduled' by English Heritage as being of 'outstanding national importance'. A recently-developed remote sacrifical anode cathodic protection system (research and development) was used to control the ongoing corrosion of the concrete reinforcements.
