A method for repairing cracks in tunnel concrete and applications thereof

By using modified Fenton-like reagents for chemical cleaning and injection of repair grout, the problem of insufficient interfacial bonding in tunnel concrete crack repair was solved, achieving high-strength and durable repair results and providing reliable quality monitoring.

CN122129291APending Publication Date: 2026-06-02SHANDONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG UNIV
Filing Date
2026-04-30
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In existing methods for repairing cracks in tunnel concrete, the grouting material is difficult to bond tightly with the substrate, resulting in insufficient overall strength and durability after repair. Furthermore, traditional cleaning methods cannot effectively remove complex contaminants, leading to the formation of new seepage channels.

Method used

Chemical cleaning is performed using a modified Fenton-like reagent. A Fenton reaction occurs within the cracks through chelated iron solution and hydrogen peroxide solution, generating hydroxyl radicals to remove contaminants. Subsequently, repair grout is injected to achieve a tight bond.

Benefits of technology

It achieves thorough cleaning of the inner surface of the crack and tight bonding of the repair grout, improves the interfacial bonding strength, ensures the high mechanical properties and long-term stability of the repair, and provides a reliable means of quality monitoring.

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Abstract

This invention relates to a method and application for repairing cracks in tunnel concrete, belonging to the field of tunnel construction technology. The method includes the following steps: drilling holes into the cracked areas of the tunnel concrete structure to be repaired, serving as grouting and venting channels, and sealing the openings of the cracks on the concrete surface; sequentially injecting a chelated iron solution of concentration x and a hydrogen peroxide solution of concentration 3-5 wt% into the cracks in the tunnel concrete structure; after the reaction, flushing the inside of the cracks and blowing away any accumulated water; and injecting repair grout into the cracks to complete the repair of the tunnel concrete cracks. The chelated iron solution and hydrogen peroxide solution, through the strong oxidizing effect of hydroxyl radicals (•OH), target and degrade organic pollutants such as oil and algae within the cracks. They also produce in-situ micro-etching on the old, smooth concrete surface, significantly improving the interfacial bonding strength.
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