Aramid fabric application in construction engineering

Aramid fiber, as a reinforcing material, has a coefficient of linear expansion similar to that of ordinary concrete, which ensures that there will be no bonding damage due to temperature changes. After proper treatment (grinding, cleaning, brushing primer) of the concrete surface, and then pasting the aramid fiber, good bonding force between the two can be ensured.

The construction process and flow of aramid used in building reinforcement. First, ① clear obstacles, clean according to the actual situation on site, the general principle is to facilitate construction. ② Lay out and check the lines on the construction site, and lay out the lines and points of the carbon aramid cloth pasting position. After the on-site technician (foreman) verifies that the layout is correct, the construction can begin. ③ Clean the concrete structure surface to be pasted, and grind the concrete surface with an angle grinder. Use a blower to blow away the floating dust on the concrete surface. Then, ④ prepare and apply the primer. Accurately weigh the main agent and curing agent of the matching resin according to the prescribed ratio, put them into a container, and stir them evenly with a stirrer. The amount of mixing should not be too much, and it should be used up within the usable time. “Kaitun” independently produces and develops reinforcing materials. Those in need can contact us directly. Quality assurance and affordable prices. ⑤ Level the concrete structure surface. Fill the concave parts of the component surface with epoxy putty and repair it to a smooth surface. When using epoxy putty in residual repair, the construction should be carried out at a temperature above -5℃ and a relative humidity of less than 85%. After the putty is applied, if there are still uneven textures on the surface, it should be polished smooth with sandpaper, and the corners should be repaired into a circular arc with a radius of no less than 30mm. ⑥ Paste the aramid cloth. Before pasting the aramid cloth, it should be confirmed that the pasting surface is dry. When the temperature is above -10℃ and the relative humidity RH>85%, construction should not be carried out without effective measures. To prevent the aramid fiber from being damaged, a steel ruler and a wallpaper knife should be used to cut the carbon fiber material according to the specified size before pasting. To prevent damage to the material during storage, the amount of material cutting should be cut according to the daily usage. Prepare the impregnation resin and apply it evenly to the component to be pasted, with a thickness of 1-3 mm, thick in the middle and thin at the edges. Roll repeatedly along the fiber direction to squeeze out air bubbles and ensure that the impregnation resin completely penetrates the aramid cloth. Apply the impregnation resin evenly to the surface of the aramid cloth. ⑦ Surface protection. If the reinforced component needs fire protection, a fire-resistant coating can be applied after the resin is cured. Coating should be carried out after the initial curing of the resin, and the relevant standards and construction regulations of the coating used should be followed. Finally, ⑧ acceptance. After completion, the project should be submitted to the supervisor or general contractor for acceptance. Then fill in the hidden inspection information, the acceptance form for the quality of sub-items/sub-projects, and ask the general contractor and supervisor to sign. Organize all the necessary documents for the project and hand them over to the general contractor to ensure the integrity of the entire project documents.

In the evaluation standard of construction quality, the main control item is that the pasting of aramid cloth must meet the design requirements and construction specifications of the reinforcement industry. The general item is that for hollowing with a diameter of more than 10mm and less than 30mm, less than 10 per square meter can be considered qualified. If there are more than 10 per square meter, it is considered unqualified and needs to be repaired. For hollowing with a diameter of more than 30mm, as long as it appears, it is considered unqualified and needs to be repaired.

When aramid fiber cloth is used in the construction of building reinforcement, the following safety matters should be noted: ① The A and B components of the matching resin should be stored in a sealed container, away from fire sources, and avoid direct sunlight. ② Operators should wear work clothes and protective masks. ③ The construction site should be equipped with various necessary fire extinguishers for rescue.