Carbon fiber reinfroced polymer(CFRP) fabric is one of the commonly materials used in concrete reinforcement, and externally bonded carbon fiber reinfroced polymer(CFRP) is a new advanced mehod of concrete strengthening. The reinforcement of carbon fiber cloth can repair the structural cracks and improve the bearing capacity of the structure. However, in addition to the selection of high quality carbon wrap, there are also some notices in the construction of carbon fiber cloth.

(carbon fiber reinfroced polymer for strengthening)

1. The treatment of concrete base material. For the angle of the structure section, the corner of the arc radius not more than 25 mm should be worn, and the surface of the concrete should be kept clean and dry. The surface water content of concrete should not be heavy rain by 6%, and the water content meter is used to detect the water content in the construction period.

2.When bonding carbon fiber cloth, the surface must be fully flat, not wrinkled, the layer is uniformly compacted, and no bubbles occur. When the multi-layer sticker is stuck, the next floor operation must be carried out when the carbon fiber cloth is reached to dry. The delay time is over 1 hours, and the operation is waiting for 12 hours.

(cfrp compoiste strengthening column)

3. After construction of carbon fiber cloth, rest for 7 days, to be fully cured, check whether Konggu phenomenon, a single 10000 mm heavy rain area not hollowing, allowed the use of injection glue filling repair. If a single detachment area greater than 10000 square mm, we should remove the re pasted carbon fiber cloth, along the direction of hand joints not less than 200 mm, if the paste more than 3 layers, the joint is not less than 300 mm, the non stress direction of joint is not less than 100 mm.

4. Some customers use little glue in order to save cost. This is wrong. The carbon fiber layer should be controlled at 1.5 millimeters, floating 0.5 millimeters.

5. Field test of bond strength between reinforced material and concrete