Electrochemical dechlorination device and method for reinforced concrete

Abstract

The invention relates to an electrochemical dechlorination device and method for reinforced concrete. The electrochemical dechlorination device comprises an MMO electrode net sleeved at the peripheryof the side face of the concrete, a reinforcing steel bar of which one end is buried in the concrete and the other end is led out from the end face of one side of the concrete and a direct current constant current source. A negative electrode of the direct current constant current source is electrically connected with the leading-out end of the reinforcing steel bar, and a positive electrode of the direct current constant current source is electrically connected with the MMO electrode net. A connecting part of the MMO electrode net and a wire, two end faces of the concrete and the side face ofthe reinforcing steel bar exposed outside the concrete are packaged by using an epoxy resin. The side face of the concrete and the MMO electrode net are cooperatively installed in a PVC container. The PVC container is internally provided with saturated Ca(OH)2 solution. A plurality of composite probes for detecting a chloride ion concentration and a pH value in the concrete are buried in the concrete. The dechlorination device is simple in structure, high in stability, good in economy, reliable in source, and high in desalting rate, and can be repeatedly used for a long time.

Description

technical field [0001] The invention relates to the technical field of electrochemical restoration, in particular to an electrochemical dechlorination device and method for reinforced concrete. Background technique [0002] Corrosion of steel bars in reinforced concrete is one of the main factors affecting the durability of structures. Concrete carbonation and chloride ion corrosion are the key factors affecting the corrosion of steel bars. [0003] At present, reinforced concrete structures in coastal areas generally suffer from corrosion damage to varying degrees in about 10 years. For concrete structures that have been corroded by chloride ions, electrochemical and physical repair methods are usually used. For concrete structures that have been corroded by chloride ions, electrochemical and physical repair methods are usually used. The physical method of repairing the concrete structure after damage is high in cost and low in efficiency; the electrochemical method is ai...

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Problems solved by technology

However, from the perspective of economic durability, using NaOH solution, Na 3 BO 3 The cost of solution and LiOH solution is relatively high, and cannot be widely used

[0005] In the prior art, the metal conductive mesh of the anode mostly adopts ordinary steel wire mesh or stainless steel wire mesh. The corrosion products produced by ordinary steel wire mesh and stainless steel wire mesh will pollute the concrete surface. Value changes, affecting the migration and diffusion of chloride ions

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