carbon fiber wrap reinforced concrete slab

Project Overview

The construction area of Xingjin Square in Guilin is about 210,000 square meters, the basement is about 80,000 square meters, the ground is about 130,000 square meters, and it is a small high-rise building with 11 to 15 floors. Because the whole project was originally designed as a commercial complex, and later the government requested to change it to a commercial residential building, the basement structure that has been constructed can no longer meet the bearing capacity requirements, and the structural floor must be reinforced. 

In order to improve the overall quality of the project and speed up the construction progress, carbon fiber wrapwas used to reinforce the 2#, 4#, 6#, 12#, 13# buildings and the first and second underground floors. After implementation, this approach has won high praise from the owners, but also saved the company's costs and achieved good social and economic benefits.

Technical characteristics and application scope of carbon fiber wrap reinforcement

Features of carbon fiber reinforcement

1. Light weight and small thickness, can work in narrow spaces, and does not affect the normal use inside the building during construction.

2. Strong acid resistance, alkali resistance, corrosion resistance and excellent durability.

3. After the construction is completed, the surface is easy to cover and has little impact on the subsequent decoration projects.

4. Maintain the original structure and beautiful appearance. Carbon fiber cloth is easy to cut and attach with the original shape of the component. The repair and reinforcement does not increase the height, width and size of the component, and the surface can be painted, pasted with decorative materials and fireproof materials.

Scope of application of carbon fiber reinforcement

1. It is suitable for reinforcement of structural members due to increased load, structural damage, design changes or construction defects, structural system changes, etc.

2. The ambient temperature of the long-term use of the reinforced component is not higher than 60℃, the relative humidity is not higher than 70% and there is no chemical corrosion, otherwise effective protective measures should be taken.

3. For the reinforced concrete structural members, the on-site measured coagulation strength level is not lower than Cl5.

The technological principle of carbon fiber reinforcement

1. Carbon fiber reinforcement uses epoxy resin as the bonding material, and sticks the carbon fiber sheet on the damaged structure along the force direction or perpendicular to the crack direction. The cemented material acts as a shear connection between them to form a new composite. Make the reinforced patch work with the original steel bar, increase the tensile or shear resistance of the structure, and effectively improve the strength, ductility and crack resistance of the structure, and control the development of cracks and deflection. The design and construction drawings of the Xingjin Plaza project are shown in Figures 1 and 2.

2. The key to the entire construction method is the tightness and firmness of the carbon fiber coposite to ensure that it is integrated with the original structure and works together.

Conclusion

Carbon fiber reinforcement technology has great advantages in cost and time efficiency compared to other reinforcement technologies. Greatly improve the strength value of the component, and it is not limited by the construction space and the shape of the reinforcement. After the reinforcement is completed, it is easy to cover and does not affect the original design intent. Therefore, it is worth adopting in the reinforcement of reinforced concrete structures and steel structural members.