Project

Huzhou Taiying Garment Co., Ltd. Staff Apartment No. 1 and Building No. 2 are located in Huzhou City, Zhejiang Province, with a construction area of 6000 square meters and 4 floors. The concrete strength of the main structure of the third and fourth floors of the project was tested by the quality supervision department and did not reach the design value. The design grade of concrete strength of the project column is C30, and the design grade of beam and slab is C25. After the design unit has checked and calculated this project, it is determined that reinforcement is needed. The beams and columns of the project are reinforced by the reinforcement method of enlarged cross-section combined with chemical planting reinforcement, and the floor slab reinforcement is reinforced by the carbon fiber sheet reinforcement method. The selected materials are carbon fiber sheet of model HM-20 and epoxy resin.

Carbon fiber reinforcement construction technology

The reinforcement process is: chisel off the original surface layer, remove impurities on the surface, and polish until new concrete is exposed. Use putty for leveling treatment, apply impregnating resin, paste unidirectional carbon cloth fiber, brush protective surface glue, brush glue, and blast, wipe the face white.

Advantages and discussion opinions of unidirectional carbon fiber reinforcement

1) Carbon fiber cloth is light in weight, does not require any heavy equipment during construction, and is very thin and does not require large space. Especially when the reinforcement space of the project is tight, this superiority can be more demonstrated.

2) Not affected by the geometrical size and shape of the building structure, the carbon fiber cloth can be bent into various geometrical shapes and sizes at will.

3) Reinforcing steel bars and concrete structures, using carbon fiber with high bonding strength and high modulus of elasticity, can also achieve the same effect as steel reinforcement, but the structural weight has not increased, and the appearance is also light and beautiful.

4) It has excellent durability. Since the reinforcement only uses carbon fiber and supporting resin, it will not rust, and has the properties of acid, alkali, salt and atmospheric corrosion resistance. Carbon fiber cloth has excellent chemical resistance.

5) In order to promote the rapid development of this new technology and new material, it is suggested that relevant units should organize their forces as soon as possible to formulate complete technical specifications such as design, construction, quality inspection and acceptance standards.

Conclusion

The new technology of externally pasting carbon fiber composite materials in the application of this project has good results without other quality problems. It is an effective method to strengthen reinforced concrete structures and is worthy of popularization and application.