Carbon fiber fabric is mainly play a role in strengthening the load capacity to the flexural members, like the reinforced concrete structure of the tensile zone layout of the same steel. In the actual design and construction, taking into account the secondary stress and other factors, there will be only one layer of carbon fiber cloth can not meet the strength requirements, then need to take multi-layer carbon fiber cloth for reinforcement.

Multilayer carbon fiber reinforced,the most widely used in the double-bonded carbon fiber reinforced. Relative to the single-layer fiber cloth bonding, double-layer carbon fiber cloth construction process is more complicated. Double-layer carbon fiber cloth should immediately bonding the next layer when reach the finger dry time. If the delay time of more than 1 hour, you should wait 12 hours after the first layer of carbon cloth re-apply gel, then carry out the construction, at the same time need to pay attention to remove the impurities such as dust that affect the paste effect.

Double-layer carbon fiber cloth not only have the strict requirements in the structural measures also must pay extra attention. Firstly, the U-shaped hoop at the end of the carbon cloth plays an important role in the double-layer carbon fiber cloth. The concrete beam is deformed by bending and the deformation of the beam and the fiber cloth is required to be coordinated. Therefore, between the concrete beam bottom and the glue, the glue and the carbon fiber cloth will produce tensile stress, prone to peeling the end of the destruction, especially for multi-layer carbon cloth. The U-shaped end of the hoop, carbon cloth will play a binding role, reducing the possibility of peeling.

In addition, in order to ensure the anchorage ability of the end of double carbon cloth, stratified cutting of the carbon fiber cloth is a more reasonable reinforcement method. In the double-carbon cloth reinforcement, there are two kinds of stratified truncation measures are optional, respectively, within the short outer long and short outer long, the effect between the two can be judged from the following aspects:

1. Force path: short outer long b-type carbon fiber in the force through the second layer of carbon polymer, the first layer of cloth and the first layer of plastic can be passed to the concrete structure, transmission force path longer, less overall integrity

   
   

2. Degree of reliability: the form of short internal long b-side carbon fiber cloth and concrete substrate there is a second paste, the probability of anchor failure is relatively high, the anchoring effect of low reliability.

   
   

3. Stripping damage: alone for the b-side anchoring effect, the structure of the short outer length of the b end of the package in which the b end has played a binding role, which also improves the b end of the anti-stripping ability