Combination electrode for the electrochemical restoration of corrosion-damaged reinforced concrete and corresponding method for controlling the same

Abstract

The invention relates to a combination electrode for the restoration of corrosion-damaged reinforced concrete and a method for controlling the same. The combination electrode consists of a dimensionally stable electrode (1); a pre-fabricated, re-usable electrolyte reservoir (2); means for protecting against evaporation (3); a pre-fabricated, interchangeable, anionic ion exchange element (4); a central fastening element comprising an anchor, anchor rod and a rapid-clamping tappet (5); a reference electrode (6) on the anchor head; a humidification device (7); a power switching element for anodic regulation (8); a measuring system for determining the state of the ion exchange element (9), in addition to electric connections for the reference cell. The method consists of subdividing the concrete surface to be restored into grid surfaces of equal size; assembling the composite electrodes on the grid surfaces; carrying out control measurements on each grid surface; setting initial values; determining measurement, regulation and termination criteria for each individual grid surface; supplying direct current to the grid surface whilst monitoring the reference potential and the potential in the chloride sensor and the disconnection flank during the course of the restoration, whereby the direct current output during the course of said restoration is regulated by pulse width modulation in such a way, that it corresponds to the energy requirements of the grid surface.

Description

technical field [0001] The invention relates to a combined electrode for electrochemical repair of reinforced concrete damaged by corrosion and a manipulation method thereof. Background technique [0002] Mineral building materials used in engineering techniques such as concrete, cement or mortar are usually reinforced with structural steel members embedded in the mineral building material. When producing defect-free concrete elements, these steel structures are clad with a thick layer of concrete, which generally protects the steel structure permanently against corrosion. Because the water in the concrete pores is alkaline, its pH index is greater than 12.5, so it plays a protective role in the concrete layer. Under these conditions, there is a thin, adherent oxide layer on the surface of the reinforcement, which in practice completely protects the steel structure from corrosion. For this reason reinforced concrete is subject to weathering and exposed components. Under u...

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Problems solved by technology

However, the method suggested by Slater has several disadvantages: on the one hand this method requires the use of voltages between 100 and 120V

The advantage of this is that although only a small amount of chlorine is released to the surroundings, it also has the disadvantage of not being able to completely inhibit the formation of chlorine.

In addition, the electrode decomposition during this method can only be used once

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