In the process of CFRP strengthening construction, it is relatively common for the reinforcement quality to fail to meet the design and construction specifications. The specific analysis mainly includes the following reasons.

(1) The quality of unidirectional carbon fiber cloth or building structural adhesive does not meet the design requirements;

(2) The surface of the concrete structure is not in compliance with the specifications;

(3) The use method of building structure adhesive ratio, mixing, etc. does not meet the use requirements of building structural adhesive, or the construction method when pasting carbon fiber cloth does not meet the requirements of the construction specifications;

(4) The carbon fiber cloth is damaged before being protected, or the protective layer is damaged (or the protective layer is cracked).

The quality of unidirectional carbon fiber cloth or building structural adhesive does not meet the design requirements

1. Personnel purchasing materials must strictly follow the specifications and models designed in the drawings, and select mature and reputable manufacturers for procurement.

2. Protective measures should be taken during the construction process, strictly in accordance with the instructions for use of carbon fiber cloth and building structural adhesive to protect it from pollution or damage

The surface of the concrete structure is not in compliance with the specifications

1.When treating the concrete surface of the structure, smash the loose concrete first, and brush away the corroded layer with the steel wire brush, and then use compressed air to remove the floating dust on the surface.

2.For uncut parts but the same place needs to be added, use concrete angle grinder, sandpaper and other tools to remove impurities such as scum and oil on the concrete surface. The concrete on the base surface of the component should be polished flat, especially the raised parts of the surface.

3.After picking, repairing and polishing the concrete surface, use acetone to clean the parts

The use method of building structure adhesive ratio, mixing, etc. does not meet the use requirements of building structural adhesive, or the construction method when pasting carbon fiber cloth does not meet the requirements of the construction specifications;

1. Technical clarification

2. Sample

3. Pay attention to mixing and proportioning

The carbon fiber cloth is damaged before being protected, or the protective layer is damaged (or the protective layer is cracked)

1. Applicants should pay attention to protect the carbon fiber cloth that has been pasted to prevent it from being bumped or contaminated

2. In order to ensure that the protective layer of the mortar outside the cloth is not cracked, the following points should be handled

(1) When sanding the surface of the carbon fiber cloth, the medium and coarse sand without mud or debris should be selected.

(2) When painting the protective layer of mortar, make sure that the structural adhesive is completely condensed and dried.

(3) Before painting the mortar protective layer, wet the attached carbon fiber cloth with water in an appropriate amount. The painted mortar protective layer should be sprinkled with water for maintenance.

Conclusion

This article summarizes the quality problems that are likely to occur in the construction of carbon fiber cloth reinforcement projects, and puts forward some methods and suggestions to prevent these problems. In response to these problems, construction technicians can formulate prevention measures in advance to prevent quality problems in advance and ensure the construction quality of the same project with carbon fiber cloth.