The research of carbon fiber materials used in the reinforcement and repair of concrete structures began in the developed countries such as the United States and Japan in the 1980s. This technology in China started very late, but with the rapid development of China's economic construction and transportation, the application of carbon fiber reinforcement has been vigorously promoted and developed rapidly. Carbon fiber reinforcement includes two application forms: carbon fiber cloth reinforcement and carbon fiber board reinforcement. There is a gap between the two in terms of structural bearing capacity.
Unidirectional Carbon Fiber Fabric
Speaking of carbon fiber cloth and prestressed carbon plates, they are made of carbon fiber materials, but the two have different differences. Then Carbon Fiber Sheet Supplier will tell you:
Unidirectional Carbon Fiber Fabric is similar to cloth, with light weight, thin thickness and soft texture, which can be cut freely and woven from carbon wire. It is suitable for the reinforcement work of dealing with the increase of the load of the building, the change of the function of the project, the aging of the material, the strength of the concrete below the design value, the treatment of structural cracks, the repair and protection of service components in harsh environments. And it can play a big role in the structure's shear resistance, earthquake resistance and bending resistance. In use, it can be pasted in multiple layers according to engineering design requirements. It is recommended that no more than 4 layers be used, because carbon fibers are posted in multiple layers at the same time, and the problem of tensile strength attenuation causes waste.
Carbon fiber board is a carbon fiber composite material made by curing carbon fiber strands and resin, similar to steel plate. It can play a very significant effect in structural bending resistance, and is often used in bridge and other reinforcement projects.
From the perspective of tensile strength alone, the specification requires that Class I carbon fiber cloth reach 3400 MPa, which is higher than Class I carbon fiber sheet 2400 MPa. However, in actual reinforcement, the increase in bearing capacity is also related to the thickness of the cross section. In this case, when the width is 10 cm, the force provided by the 1.2 mm thick carbon fiber board is 1.2 × 2400 × 100 = 288000N, Grade 300g carbon fiber cloth is 3400 × 0.167 × 100 = 56780N, the gap between the two in mechanical properties, which can be seen.
From the calculation of mechanical properties, it can be concluded that one carbon fiber board can be equivalent to 4-8 carbon cloths. When the number of carbon cloth layers exceeds 4, it is recommended to replace it with carbon fiber board for reinforcement.
Which one is better in terms of use? The specific application depends on the actual situation of the reinforcement project. No material is better, only which material is more suitable. The carbon plate is relatively hard, and the carbon cloth is relatively soft, so in the use scenario, the carbon cloth is sometimes applied to some cylindrical or irregular-shaped structures, and the carbon plate is used on the bottom of the bridge or floor, etc. Flatter place. Each product has its own advantages and disadvantages, and it is necessary to use the right medicine according to the specific situation!
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