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Carbon fiber cloth reinforcement construction instructions
1. Processing of concrete base surface
(1) Locate and place the line according to the design drawings in the parts designed to be pasted.
(2) The concrete surface should be chiseled away from the whitewash layer, oil, dirt, etc., and then grind off 1~2mm thick surface layer with angle grinder, and blow clean with blower to reveal clean, flat, structurally solid surface, if there are cracks in the reinforced concrete, it should be reinforced first depending on the size of the cracks and select the grouting glue or grouting glue to be grouted.
(3) Chamfer the sharp raised parts of the base surface with a concrete angle grinder, polished smooth. Corner of the paste should be polished into a rounded arc, arc radius should not be less than 20mm.
2. leveling treatment
If you find that the paste surface has defects, pits, depressions corners, templates joints appear high waist and other conditions, with the leveling adhesive for scraping and filling repair, to ensure that there is no obvious height difference in the joints, defects, pits smooth and smooth, depressions corners to fill the corner of the transition of rounded corners. After curing the leveling glue, then paste the carbon fiber cloth.
3. Paste carbon fiber cloth
(1) Cut the carbon fiber cloth according to the size required by the design.
(2) Configure carbon fiber adhesive component A and component B at the ratio of 2:1, use low-speed mixer to mix, mixing time is about 2~3 minutes, mixing evenly, no bubbles, and prevent dust and impurities from mixing. Carbon fiber adhesive one-time proportion should not be too much, to ensure that the configuration in 30 minutes to use up (25 ℃).
(3) Use roller or brush to apply carbon fiber adhesive on the concrete surface evenly and without omission.
(4) Spread carbon fiber cloth on the concrete surface which has been coated with carbon fiber adhesive, use plastic scraper to apply pressure along the fiber direction on the carbon fiber cloth and scrape repeatedly, so that the carbon fiber adhesive can fully impregnate the carbon fiber cloth and eliminate the air bubbles, and then brush a layer of carbon fiber adhesive on the surface of carbon fiber cloth.
(5) Repeat the above operation when pasting multi-layer, if the surface of carbon fiber cloth needs to do protective layer or painting layer, sprinkle yellow sand or quartz sand on the surface of carbon fiber adhesive before it is cured.
Construction Precautions
1. When the temperature is below 5℃, relative humidity RH>85%, water content of concrete surface is above 4%, and there is a possibility of condensation, the construction shall not be carried out without effective measures. If the construction conditions can not be reached, it is necessary to take the method of local heating of the operating surface to achieve the required relative temperature, humidity and moisture content and other conditions before construction, the construction temperature of 5 ℃ -35 ℃ is appropriate.
2. Because carbon fiber is a good conductor of electricity, it should be kept away from the power supply.
3. Construction resin should be kept away from open fire and direct sunlight, and the unused resin should be sealed.
4. Construction and inspection personnel should wear protective clothing, masks, gloves, protective glasses.
5. When the resin adheres to the skin, it should be washed immediately with soap and water, splashed into the eyes and rinse with water and seek medical treatment in time.
6. After the completion of each construction, natural conservation for 24 hours to ensure that no external hard impact and other interference.
7. Each process and after the completion of the process, are to take appropriate measures to ensure that no pollution or rainwater intrusion.
8. Configuration of carbon fiber adhesive construction site must maintain good ventilation.
9. If lapping is needed, it should be lapped along the fiber direction, and the lap should not be less than 200mm.
10, the average air temperature of 20 ℃ -25 ℃, curing time shall not be less than 3 days; average air temperature of 10 ℃, curing time shall not be less than 7 days.
11, the construction encountered a sudden drop in temperature, carbon fiber adhesive A component will appear viscosity bias, you can take heating measures, such as tungsten iodine lamps, electric furnaces or water baths and other ways to increase the temperature of the glue before use pre-heating to 20 ℃ -40 ℃.