Comparative analysis of carbon fiber concrete strengthening technology and other structural strengthening technology

Structure strengthening and repair technology can usually be divided into reinforced concrete thickening method (also called increasing section method, that is, pouring a certain thickness of reinforced concrete on the original structure), external prestressing method (including the strengthening method of changing the force system by adding fulcrums and brackets), sheet strengthening method (including outsourcing method and bonding method), and the four methods of seismic isolation and shock absorption (that is, trying to add and add seismic isolation layer, additional seismic isolation components and vibration control devices on the basis of the original structure). Among them, carbon fiber strengthening technology is the development of concrete structure repair and strengthening. The comparative analysis is shown in Table 1.

Comparative analysis of CFRP and other fiber reinforced composite materials

At present, there are three main types of fiber reinforced composite materials (FRP for short) that have been developed in the world: CFRP (carbon fiber reinforced composite material), AFRP (spinning fiber reinforced composite material), GFRP (glass fiber reinforced composite material).

Among them, CFRP is used the most, especially in the field of strengthening, because it has unparalleled advantages: high strength, high modulus, corrosion resistance, fatigue resistance and easy processing.

Application of Carbon Fiber Concrete Structure Strengthening Technology

The strengthening technology of carbon fiber concrete structure can be repaired, reinforced and retrofitting. Due to design, construction, use, aging or damage caused by certain erosion, disasters, and insufficient bearing capacity due to overload, cracks and other damages that have not yet endangered the bearing capacity can also be repaired and reinforced with carbon fiber sheets. The technology is suitable for various types of structures, such as buildings (structures), bridges, tunnels, culverts, etc., and structures of various shapes such as rectangles, circles, and curved surfaces. And various structural parts such as beams, plates, columns, nodes, arches, shells, etc.

China is the country that uses the most concrete structures in the world. At present, a considerable number of concrete structures are facing the problems of aging, insufficient strength, durability and low safety. These structures need to be reinforced to improve durability and ensure normal use. The carbon fiber strengthening technology is bound to be applied to the field of concrete structure strengthening on a large scale due to its excellent performance, simple construction, and safety and reliability, and will produce huge economic, social and environmental benefits.