A carbonation hardening based concrete structure repair method

Abstract

The invention discloses a concrete structure repair method based on carbonation hardening, which comprises the following steps: cleaning the area to be repaired; filling or applying repair materials; the composition of the repair materials is calculated as follows in parts by weight: carbonized cementitious material: 100 Parts, carbonization enhancer: 1-10 parts, fine aggregate: 5-70 parts, water reducing agent: 2-6 parts, water: 6-16 parts; use sealing device to seal the area to be repaired; to the closed area to be repaired Introduce carbon dioxide repair gas. The invention is based on the principle of carbonization hardening, the strength of the repair material develops quickly, the strength grade is high, and it can be put into service quickly after repair; the volume of the repair material will expand slightly during the carbonization process, and the volume stability is excellent in the later service process, and it is closely combined with the matrix , strong cohesion, not easy to fall off; the fluidity of the repair slurry can be designed and adjusted to meet various processes of smearing, spraying, and pouring, and has strong engineering applicability.

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