| 摘要 |
PURPOSE: To avoid troublesome works and obtain effects such as shortening of construction period at a low cost by making a current flow across a specific external electrode on the surface of a concrete structure and a steel material in the interior as an internal electrode. CONSTITUTION: A saturated aqueous solution of calcium hydroxide in the interior of a hardened concrete acts as interstitial water, which plays a role of an electrolytic solution. A current is made to flow through the concrete by applying a voltage thereto to carry out the electrochemical treatment. A platy or a sheetlike electroconductive material is installed on the surface of the concrete to feed the electrolytic solution into a space formed between the electroconductive material and the concrete surface. Thereby, the electrical conduction is carried out. The electroconductive material and electroconductive sheet or platy fibrous material are generically named an external electrode. The material is titanium, a titanium alloy, platinum, a metal plated therewith and a polymeric material having <=10<3>Ω.cm volume resistivity. The isolating distance between the concrete structure and an external electrode is about 0.2-30cm. An aqueous solution of an alkali metallic salt or an alkaline earth metallic salt is used as the electrolytic solution and a DC current is >=0.5A/m<2> per surface area of the concrete.
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