Although carbon fiber reinforcement technology started relatively late in China, because of its characteristics and advantages, this technology has developed very rapidly in China, and has been widely applied to transportation, construction, aviation, aerospace and other fields.

Carbon fiber reinforcement technology

Carbon fiber reinforcement technology (CFRP) is divided into carbon fiber sheet reinforcement technology and carbon fiber board reinforcement technology. It is a new type of strengthening and repairing technology, mainly using resin bonding materials to paste carbon fiber sheet and carbon fiber board on the surface of concrete and the stress parts of components to achieve the strengthening effect of the structure.

Properties and application scope of carbon fiber fabric

Carbon fiber used in carbon fiber reinforcement technology is a kind of inorganic polymer fiber, its carbon content is more than 90%, some carbon content as high as 99% of the material called. Carbon fiber has the characteristics of high axial strength, small thermal expansion system, low fiber density, conductivity and thermal conductivity between metals and non-metals. A large number of experiments show that this material is heat-resistant and cold-resistant, and its flexibility does not decrease at - 50 C and + 50 C. It has the advantages of high water resistance, chemical resistance, long time immersion in 10% sulfuric acid and calcium hydroxide solution, etc. Carbon fiber materials are widely used in sports equipment, industry and space missiles because they can reduce weight, increase bearing capacity, improve performance and reduce production costs in recent years. In the past, China mainly imported some finished carbon fibers from developed countries such as the United States and Japan. Although the quality is good, the price is high. With the recent development of carbon fiber processing technology in China, we can produce the imported raw material yarn in China and meet the international requirements, so that the cost is greatly reduced.

Advantages of carbon fiber reinforcement technology

Carbon fiber reinforcement technology has many advantages over other reinforcement technology. First, it is convenient and practical, the construction time is short and does not require large-scale mechanical equipment. The construction efficiency is tens of times that of Baotou steel reinforcement method. Secondly, due to the corrosion resistance of carbon fiber, the reinforcement technology will not be affected by acid-base corrosion and weather conditions, and its elasticity and ductility is very effective to improve the bearing capacity of repaired structures. Carbon fiber reinforcement technology is an environmental protection and energy saving technology, which is suitable for the needs of social development in China.

Construction technology and process of carbon fiber reinforcement technology

The technological principle of carbon fiber reinforcement technology is to use epoxy resin to treat carbon fiber into composite material, then use epoxy resin binder to paste it on the structure which needs reinforcement to form a new complex, so as to improve the load degree, extensibility and crack resistance of building structure. The main technological processes are unloading before reinforcement, treatment of the substrate, brushing the underlying resin, leveling material, pasting, curing maintenance.

Application of carbon fiber reinforcement technology and matters needing attention in construction

Carbon fiber reinforcement technology in practical engineering applications, first of all, a detailed study of the general situation of the project, to determine the location of the building structure needs to be strengthened, design drawings, in the need to strengthen the location of positioning line. Prepare construction materials such as carbon fiber materials, resins and necessary equipment, the materials used to meet national standards. Then, the parts that need to be strengthened are treated to expose the concrete and remove the material that blocks the bonding of carbon fibers on the concrete surface. Prepare the material, apply resin on the surface of the concrete, apply a dipping glue on the bottom glue, bond the concrete on the carbon fiber, pay attention to carbon fiber cloth or board should be coated with resin quickly, resin thickness at least 2 mm. Finally, wait for carbon fibers to harden for at least 12 hours before machining the surface.

End

It is self-evident that the wide application prospect and superiority of the above-mentioned CFRP strengthening technology should be fully utilized and applied to more fields.