Projects

The bridge was built in 2012. However, four years after it was put into use, the entire bridge suffered varying degrees of damage due to the burning of waste combustibles under the bridge. In particular, the damage to the bridge piers, bearings and other parts close to the scene is particularly serious. In most of these locations, the bottom concrete fell off, leaving the steel bars exposed. It was identified that the bridge was classified as Category 3, so it needed treatment. Taking into account the requirements of the bridge for the bearing capacity and durability of the pier columns, it was decided to use carbon fiber cloth to reinforce the technology. Use ring-shaped carbon fiber cloth with a maximum diameter of up to 10 cm and polymer cement mortar for reinforcement. The specific carbon fiber cloth selection reference data is shown in Table 1.

Carbon fiber composite material advantages in bridge maintenance and reinforcement

①Excellent elasticity, and the stress-strain variable is an important reference index.

②Corrosion resistance, light texture and good performance.

③Convenient operation and easy construction.

Therefore, construction materials of this material are often used in the construction of sticking carbon fiber cloth. Compared with steel, the weight of this material is only 0.25 times its weight, but it has a tensile strength more than 10 times higher than that of steel. Expressed by specific numerical values, that is, the tensile strength of this carbon fiber composite material can reach 43,000 MPa

Construction process of carbon fiber reinforcement in bridge maintenance and reinforcement

The specific construction process of the carbon fiber cloth reinforcement technology is as follows: construction preparation-construction lofting-concrete surface treatment-preparation and painting of the underlying resin, a pair of unevennesses are leveled-the impregnating resin or the resin is pasted-the carbon fiber cloth is pasted and the quality inspection is performed- Surface maintenance.

Reinforcement effect in bridge maintenance and reinforcement

After the above construction is completed, in order to confirm that the reinforced bridge meets the requirements of the standard, it shall be verified. After inspection, the resin glue in the bottom brushing position and the upper brushing position have penetrated into the carbon fiber cloth and produced a good bonding effect. The bonded part of the carbon fiber cloth used in the project did not appear to slip, crack, or loose and peel. In addition, the bonding position of the project is accurate and the bonding length also meets the requirements. After two years of use after the completion of the construction, the quality of the bridge has been steadily improved without cracks.

Conclusion

In summary, the pasting carbon fiber cloth reinforcement technology mentioned in the text is simple to operate and convenient to construct, and it is favored in bridge reconstruction and reinforcement projects. In addition to the above-mentioned advantages, the capital cost of the sticking carbon fiber cloth reinforcement technology is relatively small, and it has been proved by practice that the bridge reinforcement effect achieved by this technology is very good, so it has a good promotion and application prospect.