Usually, carbon fiber composite materials are invincible in the field of structural reinforcement, but in some projects, it will also be in a useless situation. Through this article, we can avoid this situation of carbon fiber reinforcement.

First of all, carbon fiber material reinforcement has certain requirements for the strength of the reinforced original structure. The carbon fiber material reinforcement method is not applicable to plain concrete members, and it is not applicable to the reinforcement of members with a reinforcement ratio of less than 0.2% on the side of the longitudinal tensile steel bar. In addition, the strength grade of the concrete of the original structure needs to be determined through field measurement. The strength grade of the measured concrete must not be lower than C15, and the positive tensile bond strength of the concrete surface must not be lower than 1.5MPa.

Second, the use of carbon fiber materials for reinforcement also has requirements on the stress state of the original structure. The tensile strength and modulus of elasticity of carbon fiber materials are higher than that of steel bars. At the same time, they can be combined with the concrete as a whole to receive the same force. However, carbon fiber materials are soft and have low compressive strength. Therefore, carbon fiber materials are suitable for reinforced concrete bending, axial compression, large eccentric compression and reinforcement of tensile members, such as beams and columns. For compressive structures, such as walls, they have little effect.

Third, for concrete structures that have been under high temperature, high humidity, and erosion for a long time, if carbon fiber materials are used for reinforcement construction, special attention should be paid to the use of corresponding protective facilities and special adhesives. It should also be noted that there are special operations that need to be performed in accordance with standardized construction procedures.

Finally, carbon fiber materials can be integrated with concrete structures, relying heavily on adhesives. The impregnating glue used for carbon fiber materials has a strong bonding effect on concrete. However, for steel structures, the supporting adhesive based on steel should be used for construction, otherwise the reinforcement effect will be greatly reduced.