Electrochemical repair method for dual degradation of alkali aggregate damage and steel bar corrosion

Abstract

The invention provides a concrete electrochemical repair method for dual degradation of alkali aggregate damage and steel bar corrosion, which comprises the following steps: monitoring the aggregate activity and chloride ion content of concrete test pieces, and evaluating degradation degrees of different concrete test pieces; and determining optimal electrochemical repair technical parameters based on the evaluated degradation degrees of the concrete test pieces, wherein the technical parameters comprise electrolyte concentration, current density and power-on time. A lithium compound solutionis adopted as an electrolyte, and optimal electrochemical repair technical parameters are adopted to carry out electrochemical repairing on a concrete test piece, so that the inherent alkali aggregatereaction of an existing structure and the alkali aggregate reaction induced by alkalinity increase caused by electrochemical reaction on the surface of a steel bar are inhibited while chlorine is removed. The optimal repairing parameter set can be set according to concrete test pieces with different degradation degrees in different environments, the repairing efficiency is improved, and thereforethe dual purposes of effectively preventing and treating alkali aggregate damage and steel bar corrosion are achieved.

Description

technical field [0001] The invention relates to the field of electrochemical durability repair of concrete structures, in particular to a concrete electrochemical repair method aimed at double deterioration of alkali aggregate damage and steel bar corrosion. Background technique [0002] Chloride erosion and alkali-aggregate reaction (also known as alkali-silicon reaction, alkali-aggregate reaction) are important reasons for the decline in structural durability. Chloride corrosion will induce steel bar corrosion, and the hydroxide released by the cement matrix during the corrosion process will also cause or intensify the alkali aggregate reaction, resulting in durability damage to the existing structure; Microcracks will not only affect the mechanical properties of concrete, but also intensify the erosion of harmful media such as chloride ions and sulfate ions, thereby further aggravating the premature failure of service structures. The economic losses caused by the two can...

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Problems solved by technology

However, this patent has the following problems: the corrosion potential of corroded steel bars can be improved by adding different rust inhibitors while removing chlorine, but it cannot solve the defects that may induce alkali-aggregate reaction or the inherent alkali-aggregate reaction in concrete components

However, this patent has the following problems: it only addresses the durability of concrete structures caused by chloride salt erosion, and does not involve the treatment of alkali-aggregate reactions that may be induced or inherent alkali-aggregate reactions in concrete components; and it cannot address different chloride salts Erosion and Aggregate Activity Levels of Concrete Members Adjusting Electrochemical Repair Parameters

However, the patent has the following problems: the addition of concrete admixtures in the early stage of construction can only prevent the occurrence of alkali aggregate reaction, and cannot treat the existing structure that has already undergone alkali aggregate reaction

[0006] According to the search of the prior art by the applicant, it is found that the existing electrochemical repair methods focus on improving the efficiency of chlorine removal and inhibiting the corrosion of steel bars, but do not propose or consider the process of electrochemical chlorine removal due to the alkaline, The alkali-aggregate reaction that may be caused by a large increase in temperature; at the same time, the existing technology mainly prevents the alkali-aggregate damage of concrete by adding admixtures in the early stage of construction, and does not propose a solution to the inherent alkali-aggregate damage in the existing structure Program

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