Concrete structure repairing method based on carbonization hardening

Abstract

The invention discloses a concrete structure repairing method based on carbonization hardening. The concrete structure repairing method comprises the following steps: cleaning an area that needs repairing; filling or smearing a repairing material, wherein the repairing material is prepared from the following components in parts by weight: 100 parts of a carbonized cementing material, 1 to 10 partsof a carbonization reinforcing agent, 5 to 70 parts of fine aggregate, 2 to 6 parts of a water reducing agent and 6 to 16 parts of water; sealing the to-be-repaired area by using a sealing device; and introducing carbon dioxide repairing gas into the closed to-be-repaired area. Based on a carbonization hardening principle, the repairing material is high in strength development speed and strengthgrade, and the repaired area can be quickly put into the service process. The volume of the repairing material can slightly expand in the carbonization process, the volume stability is excellent in the later service process, the repairing material is tightly combined with a matrix, the cohesiveness is high, and the falling phenomenon is not likely to occur. The fluidity of the repair slurry can bedesigned and regulated, the repair slurry is suitable for various processes such as smearing, spraying and irrigation, and the engineering applicability is high.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for repairing concrete structures based on carbonation hardening. Background technique [0002] Building materials mainly use cement-based materials as the cemented part. During the service process, they are affected by physical effects (temperature, humidity, etc.), mechanical effects (fatigue damage, abrasion, etc.), and inevitably produce micro-cracks or surface material wear and fall off. . After cracks occur or surface materials fall off, if not repaired, harmful chemicals such as sulfate ions and chloride ions will invade the interior of the material along the cracks, accelerating the erosion process, seriously affecting the service life of building materials and posing a huge safety hazard. [0003] Regular repair of building materials can prolong its service life and improve its service safety, which has huge economic benefits. The currently widel...

AI Technical Summary

Problems solved by technology

The currently widely used repair materials are mainly fast-hardening hydraulic materials. The hydration and condensation of this type of material can be adjusted, and the strength develops quickly after repair. However, due to the durability (especially frost resistance) and poor service performance in this system (high water content, poor frost resistance; hydration hardening speed is greatly affected by temperature, and strength development is slow at low temperature; hydration reaction will produce volume shrinkage, resulting in poor bonding with the matrix), the interface between the repaired area and the matrix is ​​obvious, In the later period of service, there are still weak areas, which are easy to be damaged again, resulting in a short repair period and high cost of effective repair

Therefore, it has certain limitations in the field of building material restoration