1. Concrete surface treatment

1 Remove the incomplete and damaged parts of the surface of the concrete components.

2 Repair and restore the incomplete parts of the components that have been chiseled, cleaned and exposed.

3 Crack repair: Cracks with a seam width of less than 0.2mm should be surface brushed and sealed with epoxy resin; cracks larger than 0.2mm should be grouted with epoxy resin.

4 Polishing: The protruding parts of the surface of the components (the junction parts of the concrete components, the joints of the templates, etc.) are polished and smoothed, and the surface of the repaired components is as smooth as possible.

5 Clean the surface of the polished components and dry them thoroughly.

Tow, brush the bottom glue on the defective parts

Apply the matched bottom glue (binder) evenly to the concrete surface of the defective part with a brush.

Three. Repair of surface defects

Using epoxy putty to repair the defective surface of the component surface is a very important step. The main points are as follows：

1 the main putty agent, curing promoter, and curing agent are accurately weighed in accordance with the prescribed proportions, loaded into a container, and stirred evenly with a blender.

2 The recessed parts of the surface of the component are filled with epoxy putty and repaired to a flat surface.When using epoxy putty in the repair of defects, it should be constructed at a temperature above -5℃ and a relative humidity of less than 85%.After the putty is applied and scraped, the irregularities and rough lines that still exist on the surface should be polished and smoothed with sandpaper.

Four, brush the bottom glue

Apply the matched bottom glue (binder) evenly with a roller to the concrete surface that needs to be bonded.

Five, paste carbon fiber

Before pasting the carbon fiber material, first make sure that the pasted surface is dry.When the temperature is above -10℃ and the relative humidity is RH>85%, construction shall not be carried out without effective measures.In order to prevent damage to carbon fiber, during the transportation, storage, cutting and pasting of carbon fiber materials.The steel ruler and wallpaper knife are used to cut off the carbon fiber material according to the prescribed size, and the length of each section is generally not more than 6m.In order to prevent the material from being damaged during storage, the quantity of the material should be cut according to the amount of the day.The carbon fiber longitudinal joint must be lapsed for more than 20cm.This part should be coated with more resin, and the carbon fiber does not need to be lapsed laterally.The main points of its construction process are as follows：

1 the main agent, curing promoter and curing agent for pasting resin should be accurately weighed in accordance with the prescribed proportion, loaded into a container, and stirred evenly with a stirrer.The amount of one-time blending shall be subject to being used up within the usable time.

2 When pasting, try not to have air between the carbon fiber and the resin.Rollers (special tools) can be used to roll the carbon fiber material several times along the fiber direction, so that the resin can be immersed in the carbon fiber.

Six, maintenance

After pasting the carbon fiber material, it needs to be naturally maintained for 1-2 hours to reach the initial curing, and it should be guaranteed that it will not be disturbed and collided by the outside world during the curing period.

Seven, painting

If the reinforced and reinforced components need to be fireproof, a fire-resistant coating can be applied after the resin is cured.The coating should be carried out after the initial curing of the resin, and the relevant standards and construction regulations of the coatings used should be complied with.