Carbon fiber cloth reinforcement
The characteristics,

High strength and high efficiency: tensile strength 2500 ~ 3550MPA, elastic modulus 2.35 * 105 ~ 5.0 * 105 MPA.
Light weight, thin thickness: specific gravity 1.8g/cm3, 0.1 ~ 0.2mm after each layer, basically do not increase the self-weight and section size of reinforced members.
Wide range of application: widely applicable to the construction of Bridges, tunnels and other types of structure, structure shape of the reinforcement and repair load seismic reinforcement and joint structural reinforcement.
Convenient construction: no large machines and tools, no wet operation, no fire, no fixed facilities on site, less site occupied by construction, high construction efficiency.
High durability: it is suitable for high acid, alkali, salt and atmospheric corrosion environment because it does not produce embroidery.

Ii. Scope of application

Suitable for all kinds of structural types, all kinds of structural parts of the reinforcement repair, such as beam, plate, column, roof frame, bridge pier, bridge, cylinder, shell and other structures.
It is suitable for strengthening concrete structure, masonry structure and wood structure in port project, water conservancy and hydropower project, especially for the complicated structure of curved surface and joint.
The strength requirement of base concrete shall not be lower than C15.
Construction environment temperature within 5 ~ 35 ℃, relative humidity is not more than 70%.

Iii. Process principle

The reinforcement mechanism is that the carbon fiber cloth is bonded to the surface of concrete members by high-performance carbon fiber supporting resin.
By using the good tensile strength of carbon fiber material, the bearing capacity and stiffness of members can be enhanced.

Iv. Process flow and operation points
Process flow: unloading, base treatment, coating base glue, leveling, paste and protection
Operation points:

(1) unloading
Before reinforcement, members that bear secondary loads do not need to be unloaded, and members that do not bear secondary loads must be unloaded. The unloading method is as follows:

The original suspended ceiling, wall decoration, ground surface layer, equipment and other methods are used to remove the old building, in order to achieve the purpose of unloading static load.
For some components that can not be unloaded static load, jacking can be used to unload;
The multi-point uniform jacking should be adopted for the beam bearing uniformly distributed load.
For the main beam with secondary beam function, a jack jacking shall be set under each secondary beam, and the jacking tonnage shall be determined by design calculation.
Discharging of live load

(2) base treatment

The concrete surface appears peeling, empty drum, honeycomb, corrosion and other deterioration phenomenon should be chisel away, for a larger area of inferior layer after chisel repair with epoxy mortar.
Cracks should be closed or grouted if necessary.
With the concrete Angle grinder, sandpaper and other tools to remove the concrete surface of floating slurry, grease and other impurities, the concrete of the base plane of the components to be polished flat, especially the surface of the convex part to be polished flat, corner paste to be chamfered and polished into arc shape (R is greater than or equal to 10mm).
Use a hair dryer to clean and dry the concrete surface.

(3) coating base glue (the material used is MSP base resin)

According to the proportion of main agent: curing agent = 2: l, place the main agent and curing agent in the container successively, use electric agitator to mix evenly, decide the dosage according to the environmental temperature and strictly control the service time, generally use up within 1h.
Apply the roller brush evenly on the concrete surface, wait for the glue to solidify (refer to the drying touch), and then proceed to the next step of construction.
Generally, the curing time is 2-3d.

(4) with leveling material leveling (material model for MSE leveling resin)

The concave part of the concrete surface should be filled with MSE to minimize the height difference.
MSE is also used to patch the corner into a smooth arc.

What problems should be paid attention to in the reinforcement of carbon fiber cloth

Key points of reinforcement technology: the direction of carbon fiber cloth and the direction of reinforcement force should be consistent in the bending reinforcement.
The direction of CFRP should be perpendicular to the axial direction of the member when it is strengthened by shear and seismic.
When reinforcing, concrete cannot be below the intensity grade of C15, had better ask professional construction team will consolidate.
Carbon fiber cloth is conductive, during the construction and storage should avoid close contact with electrical equipment, power supply, and other protective measures.
Avoid bending the CFRP during construction, preferably in a well-ventilated environment.


The above is about the introduction of carbon fiber cloth reinforcement, with carbon fiber cloth reinforcement technology to repair the cracks in the building is the latest reinforcement technology, hebei waite road bridge maintenance co., ltd. to provide you with the best construction team and technology