| 摘要 |
Cathodic protection of an existing concrete structure, including a steel member at least partly buried, such as steel rebar, in the concrete structur e, is provided by embedding anodes into a fresh concrete layer applied over an excavated patch and/or as a covering overlay. The anodes are embedded at spaced positions or as an array in the layer and connected to the rebar. A reinforcing layer is applied to the anode or adjacent the anode to resist expansion of the anode body tending to cause cracking of the concrete caused by the large r volume of the corrosion products relative to the anode material. Pores are provided in the anode body so as to take up the corrosion products. The reinforcing layer can be provided in the actual anode body as a closed surface surrounding the ano de material inside or may be provided in the concrete as a layer on top of the anode in an array form at or near the outer surface of the concrete.
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