The Method of Uniform Electromigration to Reinforced Concrete Structure

Abstract

The invention discloses a uniform electromigratory dechlorination method for a reinforced concrete structure. The uniform electromigratory dechlorination method comprises the following steps: a, preparing an electromigratory dechlorination device which comprises a protective cover (1) and a power source, wherein the cavity of the protective cover (1) is divided into a central rectangular cavity body (3) and a surrounding ring-shaped cavity body (4); b, fitting the protective cover (1) on one side surface of the reinforced concrete structure, wherein the surrounding ring-shaped cavity body (4) of the protective cover (1) directly faces the position, where steel reinforcement (7) or hoop reinforcement is arranged, of the side surface, and the central rectangular cavity body (3) faces the part, where no steel reinforcement (7) or hoop reinforcement is arranged, of the side surface; c, turning on two switches at the same time, and lasting for a while; and d, turning off the first switch, keeping the second switch on, and lasting for a while. By adoption of the uniform electromigratory dechlorination method, the reinforced concrete structure can be subjected to uniform electromigratory dechlorination.

Description

technical field [0001] The invention relates to the field of durable repair of reinforced concrete, in particular to a method for removing chlorine by electromigration to the uniformity of reinforced concrete structures. Background technique [0002] Coastal reinforced concrete structures are in harsh corrosive environments such as seawater and marine climates, and there are a large number of chloride ions that are corrosive to steel bars, which will reduce the engineering life of reinforced concrete structures. In order to ensure that the engineering life of the reinforced concrete structure reaches the hundred-year requirement that people expect at the time of design, it is necessary to carry out electromigration dechlorination treatment. [0003] The method of electromigration to remove chlorine in the prior art is to fix a protective cover on the concrete surface, a stainless steel plate is arranged in the protective cover, an electrolyte solution is poured in the protec...

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Problems solved by technology

[0004] However, there is a relatively large limitation in the electromigration chlorine removal method of the prior art. For the convenience of expression, combined with figure 1 To illustrate the above-mentioned problem from the perspective direction, from the perspective direction of the reinforced concrete structure, there are two steel bars 101 near one side on the transverse section of the concrete column, and the side is fitted with a protective cover 102, and the protective cover 102 is equipped with There is a whole piece of stainless steel plate 103, because the steel bar 101 is the negative pole and the whole planar stainless steel plate 103 is the positive pole, from the perspective of spatial layout, a vertical line is drawn from the axis of each steel bar 101 to the stainless steel plate 103, and the area A close to the vertical line The migration route of chloride ions is short and the migration speed is fast, while the migration path of chloride ions in the area farther from the vertical line is long and the migration speed is slow; thus, the migration of chloride ions is often uneven, and the migration speed near the vertical line is relatively long. Chloride ions in the area A of the area are migrated, while the chloride ions in the area far away from the vertical line are still there, and even in some areas such as the area B between the two vertical lines, the concentration of chloride ions is even higher than before the chlorine removal, so the chlorine ion removal Unsatisfactory effect

Moreover, the premise of the durability evaluation method of reinforced concrete structures based on Fick's second law is that the chloride ions inside the concrete are uniformly distributed. The limitations of the current electromigration dechlorination technology have resulted in non-uniform distribution of chloride ions inside the concrete after electromigration dechlorination. , making accurate durability evaluation impossible after electromigration

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