Reinforcement technology of carbon fiber cloth matters needing attention in the use of carbon fiber cloth

Strengthening masonry structure with carbon fiber sheet is a relatively new strengthening method, which is used to bear the tensile stress in the strengthened structure, improve the stress state of components and limit the generation and development of cracks.

Firstly, the technology of strengthening and repairing concrete structures with carbon fiber sheets.

The technology of strengthening and repairing concrete structures with carbon fiber sheets is a new special technology that sticks high-performance carbon fibers on the surface of building structural members with three-finger materials to form advanced composite materials, and works together with existing structural members to enhance and improve the mechanical properties of structural members. Carbon fiber sheet strengthening method is an advanced construction method for strengthening reinforced concrete structures such as bridges, tunnels and buildings in developed countries such as Japan, the United States and Europe, and it has also been widely used in China.

Key technologies for strengthening concrete structures with carbon fiber sheets;

1. Epoxy resin must be fully soaked in carbon fiber materials, and each tiny carbon fiber filament must be bonded together to make it bear the same stress.

2. It is necessary to firmly bond the carbon fiber composite with the existing structure to form a new structural member to bear the stress.

Main materials for strengthening concrete structures with carbon fiber sheets;

3. carbon fiber cloth;

4, carbon fiber cloth matching resin.

Second, the technical advantages of carbon fiber sheet reinforcement

1、? The self-weight is light, the thickness is small, and the thickness of the matrix is basically not increased after reinforcement;

2? Good flexibility, suitable for beams, columns, plates, pipes, walls and other components with various shapes;

3? , acid resistance, alkali resistance, chemical corrosion resistance, suitable for various harsh environments;

4、? Convenient construction and short construction period;

5、? Pollution-free, in line with environmental protection requirements;

6? Long storage life and long service life.

Third, the application scope of carbon fiber sheet reinforcement

1、? Bending and shear strengthening of concrete beams, bending strengthening of slabs, seismic strengthening of columns, etc.

2. Reinforcement of industrial and civil buildings such as factories, buildings, schools and hospitals;

3、? Strengthen the construction of infrastructure such as roads and bridges, water conservancy, nuclear power and energy.

Fourth, the process flow

Remove obstacles → Pay-off and check the line → Clean the surface of concrete structure with adhesive tape → Prepare and brush the primer → Level the surface of concrete structure → Stick carbon fiber cloth → Protect the surface → Check the application.

Verb (abbreviation of verb) construction process

1, obstacle clearance

1. 1, according to the actual situation to clean up, the general principle is to facilitate construction.

1.2. The on-site quality inspector shall check the cleaning condition, and proceed to the next working procedure after passing the inspection.

2, pay-off, line inspection

2. 1, release the position line of carbon fiber cloth pasting position.

2.2, on-site technicians (foreman) after checking the pay-off, can start construction.

3. Clean the surface of concrete structure with carbon fiber cloth.

3. 1. Grind the concrete surface with an angle grinder.

3.2. Blow off the floating dust on the concrete surface with a hair dryer.

3.3. Party A, the supervisor and the general contractor are invited to accept the polished concrete surface.

4. Prepare and brush the primer

4. 1. Weigh it accurately in strict accordance with the proportion specified by the supporting resin main agent and curing agent, put it into a container and stir it evenly with a stirrer. The quantity allocated at one time cannot be too much, which shall be subject to being used up within the available time.

5, concrete structure surface leveling

5. 1. The concave part on the surface of the component shall be filled with epoxy putty, and the surface shall be smooth. When epoxy putty is used for incomplete repair, it should be constructed at a temperature above -5℃ and a relative humidity below 85%. After the putty is plastered, there are still rough lines on the surface, which should be polished with sandpaper, and the corners should be made into an arc with a radius of not less than 30 mm

Step 6 stick carbon fiber cloth

6. 1. Before pasting carbon fiber materials, first confirm that the pasting surface is dry. The temperature is below-65438 00℃ and the relative humidity RH >；; 85%, if there is no effective measures, construction shall not be carried out. In order to prevent the carbon fiber from being damaged, the carbon fiber material should be cut with a steel ruler and wallpaper knife according to the specified size before pasting, and the length of each section is generally less than 6m. In order to prevent the material from being damaged during storage, the cutting amount of the material shall be subject to the cutting amount of the day. The lap length of the longitudinal joint of carbon fiber shall not be less than 100 mm, and this part shall be coated with more resin, and the transverse lap of carbon fiber is unnecessary.

6.2、? Prepare impregnating resin and evenly coat it on the parts to be pasted, with a thickness of 1 ~ 3 ㎜, a thick middle part and a thin edge.

6.3、? Roll along the fiber direction for many times to extrude bubbles, so that the impregnated resin completely soaks the fiber cloth.

6.4, carbon fiber cloth surface evenly coated with impregnating resin.

7. Surface protection treatment

7. 1. If the reinforcement member needs fire protection? After the resin is cured, it can be coated with fireproof paint. Painting should be carried out after the initial curing of the resin, and the relevant standards and construction regulations of the coating used should be observed.

8. Apply for inspection

8. 1, please ask the supervisor or general contractor for acceptance after completion. Fill in the hidden inspection data, engineering quality inspection approval form, and please sign it by the head of the general contractor and the supervisor.

8.2. Organize all necessary data of the project and hand them over to the general contractor to ensure the integrity of the whole project data.

Six, the construction quality standards

1, master project:

Sticking carbon fiber cloth must meet the design requirements and construction specifications of steel bar industry.

2. General items:

2. 1, hollows with a diameter of 10mm and less than 30mm, which are less than 10 per square meter, can be regarded as qualified;

2.2. If it exceeds 10 per square meter, it will be deemed unqualified and needs to be repaired.

2.3, for empty drum with a diameter of more than 30mm, as long as it appears, it is considered unqualified and needs to be repaired.

? Seven, construction matters needing attention

1. Safety precautions for pasting carbon fiber cloth:

1. 1, Component A and Component B of the matching resin should be stored in a sealed way, away from fire sources and away from direct sunlight;

1.2, operators should wear work clothes and protective masks;

1.3, the construction site should be equipped with all kinds of necessary fire extinguishers for rescue;

2, safety protection measures

2. 1, in dangerous places, two protective railings should be set at the edge, and red marker lights should be set at night.

2.2, the construction frame in strict accordance with the scaffolding safety technical protection standards and specifications.

3, fire management measures

3. 1, strengthen the fire control work of this project, ensure the normal construction and production, and protect the life and property safety of the country and people.

3.2. Fire fighting equipment, such as fire buckets, shovels, hooks and shovels, should be placed on site.

3.3. Establish fire control responsibility system at all levels, formulate fire control system and supervise its strict implementation.

3.4, establish the system of open flame application with fire certificate, no smoking in the construction site, and control the fire source.

Carbon fiber cloth reinforcement company

Yixing Yitai carbon fiber weaving co., ltd

Guangzhou weipu chemical industry analysis technology co., ltd

Beijing ruishengte building materials co., ltd

Guangzhou dezhenghang construction technology co., ltd

Beijing Vu Thang Zhizao Construction Engineering Co., Ltd.

Wuxi shengte carbon fiber products co., ltd

Haining anjie composite material co., ltd

The above is the carbon fiber sheet reinforcement and safety precautions introduced by Bian Xiao. I hope it helps you. For more information, please pay attention to Tuba rabbit decoration.

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