Carbon fiber composite strengthening methods include carbon fiber fabric strengthening and carbon fiber strip strengthening,  and carbon fiber strip reinfrocement has many advantages over carbon fiber fabric reinforcement.

Carbon fiber strip has good mechanical effect

The GB50367-2013 Code for Reinforcement Design of Concrete Structures clearly stipulates that the design values of tensile strength of CFRP and CFRP strip in important components are 1600 MPa and 1150 MPa respectively. We take the 10cm wide 300g CFRP and 1.2 thick CFRP strip as examples.

The tensile force of 10cm carbon cloth is 1600*100*0.167 (300g carbon cloth thickness) =26720N.

The tensile force of 10cm carbon plate is 1150*100*1.2=138000N.

From the calculation results, we can see that bonding a layer of carbon fiber strip with the same width of 1.2 mm thick is more than five times the tensile force of bonding a layer of 300 g carbon cloth.

Carbon fiber strip has higher strength utilization ratio

As mentioned above, the design value of tensile strength of primary carbon cloth in important components is 1600 MPa, the tensile strength of primary carbon sheet in important components is 1150 MPa, and the tensile strength of primary carbon cloth and primary carbon sheet are 3400 MPa and 2400 MPa, respectively. Based on the above data, we can calculate their strength utilization respectively.

Carbon fiber cloth strength utilization: 1600/3400=47.1%

Carbon fiber plate strength utilization: 1150/2400=47.9%

Although the strength utilization ratio of carbon strip is not obvious compared with carbon cloth in calculation, the strength utilization ratio of carbon fiber strip is positively correlated with the ratio of unit deformation rate to tensile force, which is obviously superior to carbon cloth.

Better quality control for sticking carbon fiber strip

Carbon plate is carbon fiber precursor through the use of resin infiltration hardening to form carbon fiber sheet, the material itself is harder, in the plastering glue control, the pressure control when pasting, pasting effect will not be a problem. In the process of CFRP bonding, there will be a series of common problems such as warping and bulging. And the carbon cloth paste is higher than the carbon board paste base surface.