Benefits of using carbon fiber reinforcement material in the structural strengthening and repair of concrete building structures

Compared with the previous reinforcement method, the carbon fiber reinforcement effect is better in the structural strengthening and repair of concrete building structures. Carbon fiber reinforcement materials are especially used in old buildings to reinforce prestressed hollow slabs in old houses. Carbon fiber reinforcement does not require the use of large machinery and equipment, and has high gain efficiency and low noise.

The technical advantages of carbon fiber reinforcement materials can be mainly analyzed as follows:

(1) It has a wide range of applications: carbon fiber reinforcement materials can replace shearing and bending steel bars, can also be used to prevent earthquakes and cracks in townhouses or industrial buildings, and can also strengthen anti-corrosion structures. Carbon fiber reinforcement materials has a waterproof structure. Epoxy adhesives are used on concrete surfaces reinforced with carbon fibers. The epoxy adhesive itself has good sealing performance. Therefore, the carbon fiber reinforced method also has a strong sealing ability.

(2) Carbon fiber reinforcement is feasible, as is carbon fiber reinforcement materials. The light and thin texture does not require complicated construction machinery, and the construction personnel can complete it manually, and the carbon fiber reinforcement method can also effectively shorten the engineering cycle.

(3) The carbon fiber reinforcement method is easy to cut at will. According to the actual reinforcement requirements of the building structure, after the carbon fiber reinforcement materials is cut, the carbon fiber reinforcement materials does not affect the appearance of the building structure.

(4) The carbon fiber reinforced method has high corrosion resistance. Because the carbon fiber reinforcement materials has stable performance, it is not affected by the outdoor environment used, and the structure of the building can be effectively expanded.

The use of carbon fiber reinforcement materials in various concrete stress members

Through the application of force, carbon fiber reinforced materials can meet the requirements of various load-bearing concrete members during the reinforcement of building structures.

(1) Reinforced concrete bending parts of ordinary cross-section carbon fiber reinforced concrete bending parts of ordinary cross-section carbon fiber are tested. We can confirm that the concrete part of the component obtained with carbon fiber reinforcement materials is used for enhanced carbon in terms of strength, stability and load capacity. Through some improvements, the overall strength of the reinforcement member has also been significantly improved, and the width of the crack caused by the cracking of the member has also been significantly reduced. When the reinforced component reaches the limit of the bearing capacity, the number and width of cracks generated by the component will be greatly reduced, and the distribution of cracks will be more regular.

(2) Carbon fiber reinforced concrete pressure element. The regular winding of carbon fiber reinforcement materials on the square concrete column can significantly improve the bearing capacity and stability of the square concrete column. By using carbon fiber reinforced methods to enhance the bearing capacity of concrete columns can also be improved. After being reinforced with carbon fiber, the compressed concrete is compressed under load. However, due to the strong retention of carbon fiber, it ensures the passive retention of the reinforcing element and generates a corresponding lateral retention force. When limited concrete is formed, the bearing capacity of the concrete compression element is greatly improved.

(3) The carbon fiber reinforced concrete shear element with diagonal cross-section. The use of carbon fiber reinforcement materials in the reinforcement and reconstruction of building structures can also effectively improve the shear strength of the concrete element. By selecting appropriate reinforcement method, reinforcement amount and anchoring method, the shear resistance of concrete members can be effectively improved. In the past, the use of carbon fiber for reinforcement and conversion usually used packaging and bonding methods to make full use of carbon fiber and obtain better reinforcement strength. However, the winding and bonding process has certain disadvantages, that is, the strengthening process is complicated, which is why U-shaped carbon fiber paste is used instead of carbon fiber paste.

(4) Constrained concrete is an important form of composite reinforcement. By using a square concrete support covered with carbon fiber, its bearing capacity can be greatly improved. By using concrete supports covered with carbon fibers, the load carrying capacity can be further improved. Carbon fiber concrete is a passive constraint: as the axial pressure of the concrete increases, the lateral expansion will promote the circumferential expansion of the external composite material, resulting in a lateral retention force. The stress mechanism depends on two factors: the lateral expansion coefficient of concrete and the tire stiffness of the external carbon fiber material. The initial lateral deformation of the concrete column is low, so the load of the carbon fiber is low. During the final loading of the concrete column, the carbon fiber load increases rapidly as the column load increases until it is destroyed.

Conclusion

The carbon fiber reinforcement materials is light-weight, does not require bulky equipment during construction, and is very thin and takes up very little space. Especially in the case of limited space, for technical reinforcement products that may have this advantage. The method of connecting high-strength carbon fiber reinforcement materials with high elastic modulus by the reinforced concrete structure can obtain the same reinforcement effect as the steel plate, but the structure weight has not increased, and its appearance is also lightweight and beautiful. Thanks to this technology, this reinforced structure has excellent resistance: because only carbon fiber and carrier resin are used for reinforcement, it will not rust, and it will effectively shorten the construction time due to acid, alkali, salt and atmospheric corrosion. The price of CFRP reinforcement material is higher than other commonly used materials, but its excellent performance has been confirmed.