Permeable steel bar corrosion inhibitor for durability repair of concrete structure and preparation method thereof

Abstract

The invention relates to a permeable organic corrosion inhibitor for durability repair of concrete structure, and belongs to the field of building materials. The permeable organic corrosion inhibitor comprises the following components: 40-60% of an organic corrosion inhibitor, 5-15% of a surfactant and 30-45% of an alkali resistant penetrant. The surfactant is selected from an amino acid surfactant or an aliphatic ester surfactant; and the alkali resistant penetrant is a mixture composed of one or more of isooctanol phosphate, heterogeneous polyoxyethylene aliphatic alcohol phosphate and fatty alcohol-polyoxyethylene ether in arbitrary proportion. The preparation method is as below: mixing the surfactant with the organic corrosion inhibitor; stirring while heating; and after full fusion of the mixture, adding an organic osmotic agent with stirring until the mixed liquid turns from turbid to clear state to obtain the product. The preparation method of the invention is simple; the obtained product can be used in surface treatment or reinforcement of concrete structure in work, has excellent penetration ability and corrosion resistance effect, and can effectively prevent or delay corrosion of steel bar in concrete structure by the chloride salts, and does not have adverse effect on the performance of concrete.

Description

technical field [0001] The invention relates to a permeable steel bar rust inhibitor for durable repair of concrete structures and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] The steel bars in the concrete structure in the marine environment and deicing salt environment are easily corroded by chloride salts, which greatly reduces the durability and service life of the concrete structure. Therefore, how to prevent the corrosion of steel bars in concrete structures or repair the damaged steel bars in concrete structures that have suffered from chloride corrosion has become the key to maintaining and improving the durability of concrete structures in harsh environments. In recent years, the rapid development and application of high-performance concrete has alleviated the durability of concrete to a certain extent. However, due to the characteristics of concrete materials and the complexity of engineering, c...

AI Technical Summary

Problems solved by technology

In recent years, the rapid development and application of high-performance concrete has alleviated the durability of concrete to a certain extent. However, due to the characteristics of concrete materials and the complexity of engineering, coupled with the low water-binder ratio of high-performance concrete, cracks are likely to occur if improper maintenance. Cracks will inevitably accelerate the penetration of harmful substances in the environment into the structure, causing the steel bars in the structure to be corroded to varying degrees, reducing the durability and service life of the concrete structure

Years of engineering practice have also shown that only relying on the use of high-performance concrete cannot completely solve the durability of concrete structures in harsh environments

[0003] In order to prevent the corrosion of steel bars in concrete structures in harsh environments such as chloride salts, a relatively simple and effective method has been to add inorganic steel bar rust inhibitors to concrete for a long time. For the corrosion protection and repair of steel bars in existing concrete structures, Incorporated rust inhibitors cannot be applied

The traditional rust inhibitor for steel bars is mainly nitrite. Since nitrite is an anodic rust inhibitor and is carcinogenic, low content will cause accelerated local corrosion of steel bars. The use of this type of steel bar rust inhibitor has been clearly banned in some European countries

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