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Unidirectional carbon fiber fabric is primarily used for reinforcing structural points in building structures such as beams, columns, walls, floor slabs, and piers. Our company selects high-quality, high-strength carbon fibers and processes them through a specialized process to create unidirectional carbon fiber fabric. This fabric features uniform, straight carbon fiber distribution, minimal thickness variation, and easy resin penetration, ensuring the carbon fiber's reinforcing properties are fully and effectively utilized.
R-CF-UD 200gsm Construction Reinforcement Unidirectional Carbon Fiber Fabrics
Performance Items | 200g LV1 | 200g LV2 | |
Gram weight (g/㎡) | 200 | 200 | |
Thickness (mm) | 0.111 | 0.111 | |
Tensile strength | International Standards | ≥3400 | ≥3000 |
Actual test data | 3710 | 3325 | |
Modulus of elasticity | International Standards | ≥2.3*10⁵ | ≥2.1*10⁵ |
Actual test data | ≥2.31*10⁵ | ≥2.2*10⁵ | |
Elongation(%) | International Standards | ≥1.7 | ≥1.5 |
Actual test data | 1.7 | 1.74 |
Product Features
Unidirectional carbon fiber fabric is primarily used for reinforcing structural points in building structures such as beams, columns, walls, floor slabs, and piers. Our company selects high-quality, high-strength carbon fibers and processes them through a specialized process to create unidirectional carbon fiber fabric. This fabric features uniform, straight carbon fiber distribution, minimal thickness variation, and easy resin penetration, ensuring the carbon fiber's reinforcing properties are fully and effectively utilized.
R-CF-UD 200gsm Construction Reinforcement Unidirectional Carbon Fiber Fabrics
Performance Items | 200g LV1 | 200g LV2 | |
Gram weight (g/㎡) | 200 | 200 | |
Thickness (mm) | 0.111 | 0.111 | |
Tensile strength | International Standards | ≥3400 | ≥3000 |
Actual test data | 3710 | 3325 | |
Modulus of elasticity | International Standards | ≥2.3*10⁵ | ≥2.1*10⁵ |
Actual test data | ≥2.31*10⁵ | ≥2.2*10⁵ | |
Elongation(%) | International Standards | ≥1.7 | ≥1.5 |
Actual test data | 1.7 | 1.74 |
Product Features
Application of Carbon Fiber Reinforced Polymer
Carbon fiber reinforced polymer (CFRP) is one of the most widely used high-performance reinforcement materials in civil engineering. With its advantages of high strength, lightweight, corrosion resistance, and ease of construction, it has become a core material for reinforcing and renovating concrete, steel, and masonry structures. Its application scenarios span the entire lifecycle of a building structure, from improving the performance of new structures to repairing and extending the life of existing structures, and even for emergency reinforcement after disasters. Specific applications can be categorized by structural type and reinforcement objective as follows:
Core Application Scenarios:
The reinforcement function of carbon cloth essentially involves forming a "synergistic force-bearing system" with the original structure through the adhesive (epoxy resin). This transfers the carbon cloth's high strength (tensile strength approximately 7-10 times that of ordinary steel bars) to weak areas of the structure, thereby compensating for insufficient load-bearing capacity, rigidity deficiencies, or durability issues in the original structure.
The application focus varies significantly across different structures:
1. Concrete Structure Reinforcement (Most Mainstream Application)
Concrete structures are the core application for carbon cloth reinforcement, including key components such as beams, slabs, columns, walls, and joints. The core issues addressed are "inadequate bearing capacity," "crack control," and "ductility improvement." Specific applications are shown in the table below:
Reinforced components | Core issues | Carbon cloth reinforcement methods | Typical scenarios |
Concrete beams | Insufficient bending bearing capacity (excessive deflection, bottom cracking), insufficient shear bearing capacity (oblique cracks at beam ends) | - Bending reinforcement: 1-3 layers of carbon cloth are pasted on the bottom of the beam (parallel to the direction of force) - Shear reinforcement: U-shaped or ring-shaped carbon cloth is pasted on the side of the beam (perpendicular to the direction of force) | Renovation of floor beams of old office buildings (increased load), repair of bridge main beams (increased vehicle load) |
Concrete columns | Insufficient axial/eccentric compressive bearing capacity (column cracking, deformation), insufficient ductility (brittle failure due to earthquakes) | - Hoop-wrapped carbon cloth (creating a "constraint effect", similar to stirrups) - Carbon cloth glued to the biaxial tension zone (resisting horizontal forces) | Seismic reinforcement of frame structure columns (improvement of seismic resistance of old buildings), load-increasing transformation of basement columns |
Concrete slabs | Insufficient bending bearing capacity (cracks at the bottom of the plate, insufficient bearing capacity), insufficient local shear resistance | - Carbon cloth strips are pasted along the stress direction on the bottom of the board (unidirectional or bidirectional) - Radial carbon cloth is pasted on the board column nodes (to resist punching shear) | Adding partitions/equipment to residential floors (increased load), converting garage roofs to commercial use |
Concrete walls | Insufficient shear bearing capacity (diagonal cracks in the wall) and insufficient out-of-plane bearing capacity | - Horizontal carbon cloth is pasted on the wall (to resist horizontal shear force) - Bidirectional carbon cloth mesh is pasted on the wall (to improve out-of-plane stiffness) | Seismic reinforcement of shear wall structures, anti-seepage and reinforcement of basement retaining walls |
Joints | Insufficient bearing capacity of the core areas of beam-column joints and wall panel joints (earthquakes easily lead to damage) | - Paste the node area with a "tic-tac-toe" or ring-shaped carbon cloth (wrapping the core area) | Seismic retrofitting of frame structure nodes (old building nodes without stirrups or insufficient stirrups) |
2. Steel Structure Reinforcement
Steel structure reinforcement requirements are often focused on increasing bearing capacity, improving stability, and repairing damage. Carbon cloth offers the advantages of eliminating the need for welding (preventing damage to the steel structure from high temperatures) and does not increase the structure's deadweight. Specific applications include:
Reinforcement of Tension/Compression Members: Carbon cloth is applied to the flanges or webs of steel structures to increase tensile/compressive bearing capacity (e.g., when steel columns or beams have insufficient cross-sections).
Joint Reinforcement: When welds crack or bolted connections are insufficient at steel joints, carbon cloth is applied around the joints to disperse stress concentrations (e.g., at steel truss joints and steel frame beam-column joints).
Fatigue Damage Repair: When fatigue cracks develop in steel structures subjected to alternating loads (e.g., bridges and factory crane beams), carbon cloth is applied to seal the cracks, preventing them from propagating and extending fatigue life.
3. Masonry Reinforcement
Masonry structures (brick walls and columns) have high rigidity but very low tensile strength, making them susceptible to cracking due to temperature fluctuations, settlement, or earthquakes. Carbon cloth is primarily used for:
Wall Anti-Crack/Seismic Reinforcement: Attaching carbon cloth horizontally or vertically to the surface of brick walls increases the tensile and shear resistance of the wall and reduces cracking (e.g., brick walls of old residential buildings and historical buildings);
Brick Column Reinforcement: Wrapping axially compressed brick columns with carbon cloth circumferentially creates a constraint and increases compressive bearing capacity (e.g., brick columns of old factory buildings and fences).
4. Special Structural Reinforcement
Bridge Structures: Flexural reinforcement of main beams (using carbon cloth on the bottom), seismic reinforcement of bridge piers (using carbon cloth on the circumferential surface), and reinforcement of the lower slab of bridge deck pavement (using carbon cloth to improve crack resistance). The lightweight nature of carbon cloth avoids adding weight to the bridge.
Tunnel Structures: When cracks or leaks occur in the tunnel lining concrete, carbon cloth can be applied to the inside to seal the cracks and increase lining stiffness (e.g., subway tunnel and highway tunnel repairs).
Historical Buildings/Cultural Relics: Reinforcement of historical buildings (e.g., ancient wooden structures encased in concrete or masonry) requires minimally invasive treatment. Carbon cloth application does not require demolition of existing components and can be combined with antique coatings, minimizing the appearance of the building (e.g., reinforcement of beams and columns in ancient city walls and temples).
Application of Carbon Fiber Reinforced Polymer
Carbon fiber reinforced polymer (CFRP) is one of the most widely used high-performance reinforcement materials in civil engineering. With its advantages of high strength, lightweight, corrosion resistance, and ease of construction, it has become a core material for reinforcing and renovating concrete, steel, and masonry structures. Its application scenarios span the entire lifecycle of a building structure, from improving the performance of new structures to repairing and extending the life of existing structures, and even for emergency reinforcement after disasters. Specific applications can be categorized by structural type and reinforcement objective as follows:
Core Application Scenarios:
The reinforcement function of carbon cloth essentially involves forming a "synergistic force-bearing system" with the original structure through the adhesive (epoxy resin). This transfers the carbon cloth's high strength (tensile strength approximately 7-10 times that of ordinary steel bars) to weak areas of the structure, thereby compensating for insufficient load-bearing capacity, rigidity deficiencies, or durability issues in the original structure.
The application focus varies significantly across different structures:
1. Concrete Structure Reinforcement (Most Mainstream Application)
Concrete structures are the core application for carbon cloth reinforcement, including key components such as beams, slabs, columns, walls, and joints. The core issues addressed are "inadequate bearing capacity," "crack control," and "ductility improvement." Specific applications are shown in the table below:
Reinforced components | Core issues | Carbon cloth reinforcement methods | Typical scenarios |
Concrete beams | Insufficient bending bearing capacity (excessive deflection, bottom cracking), insufficient shear bearing capacity (oblique cracks at beam ends) | - Bending reinforcement: 1-3 layers of carbon cloth are pasted on the bottom of the beam (parallel to the direction of force) - Shear reinforcement: U-shaped or ring-shaped carbon cloth is pasted on the side of the beam (perpendicular to the direction of force) | Renovation of floor beams of old office buildings (increased load), repair of bridge main beams (increased vehicle load) |
Concrete columns | Insufficient axial/eccentric compressive bearing capacity (column cracking, deformation), insufficient ductility (brittle failure due to earthquakes) | - Hoop-wrapped carbon cloth (creating a "constraint effect", similar to stirrups) - Carbon cloth glued to the biaxial tension zone (resisting horizontal forces) | Seismic reinforcement of frame structure columns (improvement of seismic resistance of old buildings), load-increasing transformation of basement columns |
Concrete slabs | Insufficient bending bearing capacity (cracks at the bottom of the plate, insufficient bearing capacity), insufficient local shear resistance | - Carbon cloth strips are pasted along the stress direction on the bottom of the board (unidirectional or bidirectional) - Radial carbon cloth is pasted on the board column nodes (to resist punching shear) | Adding partitions/equipment to residential floors (increased load), converting garage roofs to commercial use |
Concrete walls | Insufficient shear bearing capacity (diagonal cracks in the wall) and insufficient out-of-plane bearing capacity | - Horizontal carbon cloth is pasted on the wall (to resist horizontal shear force) - Bidirectional carbon cloth mesh is pasted on the wall (to improve out-of-plane stiffness) | Seismic reinforcement of shear wall structures, anti-seepage and reinforcement of basement retaining walls |
Joints | Insufficient bearing capacity of the core areas of beam-column joints and wall panel joints (earthquakes easily lead to damage) | - Paste the node area with a "tic-tac-toe" or ring-shaped carbon cloth (wrapping the core area) | Seismic retrofitting of frame structure nodes (old building nodes without stirrups or insufficient stirrups) |
2. Steel Structure Reinforcement
Steel structure reinforcement requirements are often focused on increasing bearing capacity, improving stability, and repairing damage. Carbon cloth offers the advantages of eliminating the need for welding (preventing damage to the steel structure from high temperatures) and does not increase the structure's deadweight. Specific applications include:
Reinforcement of Tension/Compression Members: Carbon cloth is applied to the flanges or webs of steel structures to increase tensile/compressive bearing capacity (e.g., when steel columns or beams have insufficient cross-sections).
Joint Reinforcement: When welds crack or bolted connections are insufficient at steel joints, carbon cloth is applied around the joints to disperse stress concentrations (e.g., at steel truss joints and steel frame beam-column joints).
Fatigue Damage Repair: When fatigue cracks develop in steel structures subjected to alternating loads (e.g., bridges and factory crane beams), carbon cloth is applied to seal the cracks, preventing them from propagating and extending fatigue life.
3. Masonry Reinforcement
Masonry structures (brick walls and columns) have high rigidity but very low tensile strength, making them susceptible to cracking due to temperature fluctuations, settlement, or earthquakes. Carbon cloth is primarily used for:
Wall Anti-Crack/Seismic Reinforcement: Attaching carbon cloth horizontally or vertically to the surface of brick walls increases the tensile and shear resistance of the wall and reduces cracking (e.g., brick walls of old residential buildings and historical buildings);
Brick Column Reinforcement: Wrapping axially compressed brick columns with carbon cloth circumferentially creates a constraint and increases compressive bearing capacity (e.g., brick columns of old factory buildings and fences).
4. Special Structural Reinforcement
Bridge Structures: Flexural reinforcement of main beams (using carbon cloth on the bottom), seismic reinforcement of bridge piers (using carbon cloth on the circumferential surface), and reinforcement of the lower slab of bridge deck pavement (using carbon cloth to improve crack resistance). The lightweight nature of carbon cloth avoids adding weight to the bridge.
Tunnel Structures: When cracks or leaks occur in the tunnel lining concrete, carbon cloth can be applied to the inside to seal the cracks and increase lining stiffness (e.g., subway tunnel and highway tunnel repairs).
Historical Buildings/Cultural Relics: Reinforcement of historical buildings (e.g., ancient wooden structures encased in concrete or masonry) requires minimally invasive treatment. Carbon cloth application does not require demolition of existing components and can be combined with antique coatings, minimizing the appearance of the building (e.g., reinforcement of beams and columns in ancient city walls and temples).
How to Use Carbon Fiber Fabrics
I. Preliminary Construction Preparation
Material Preparation and Inspection
Core Materials: Carbon cloth (must meet the designed number of layers and width, such as 12K unidirectional carbon cloth, common specifications include 200g/㎡ and 300g/㎡), special epoxy resin adhesive (including primer, leveling adhesive, and impregnating adhesive, which must match the carbon cloth model and be within the shelf life. Ordinary glue is strictly prohibited).
Material Inspection: The carbon cloth surface must be free of damage, wrinkles, or oil stains; the adhesive must be free of delamination or sedimentation, and must be uniform and free of particles after stirring.
Environmental Control
Temperature: Construction and curing temperatures must be between 5°C and 35°C. Heating measures must be implemented for temperatures below 5°C, and shading and cooling must be applied for temperatures above 35°C.
Humidity: Ambient humidity must be less than 85%. Construction should be suspended in rainy weather or when the base surface is damp. Resume work after the base surface is completely dry.
Site Cleanup: The area around the reinforcement must be free of debris and dust. Stable scaffolding must be constructed for overhead work. Working overhead without protective gear is strictly prohibited.
Tool Preparation
Surface Preparation Tools: Angle grinder (with diamond grinding disc), chisel, hammer, wire brush, hair dryer or vacuum cleaner, rag;
Adhesive Application Tools: Mixing bucket, electric stirrer, scraper, roller (special defoaming roller, width matching the carbon cloth);
Carbon Cloth Handling Tools: Tape measure, wallpaper cutter, ruler.
II. Core Construction Process
Concrete structures (beams, columns, and slabs) are the primary targets for carbon cloth reinforcement. During the construction process, special attention should be paid to "surface flatness" and "wetting of the adhesive into the carbon cloth." The specific steps are as follows:
![]() | Step 1: Surface Preparation Surface Cleaning: Use a hammer or chisel to remove loose concrete, laitance, and hollows from the reinforced area. Roughening: Use an angle grinder (with a diamond grinding wheel) to roughen the surface perpendicular to the direction of carbon cloth application (to increase the bonding area). Crack Treatment: If cracks are present, treat them according to their width. For cracks less than 0.2mm, clean them with a wire brush and then apply primer directly. For cracks greater than 0.2mm, first apply a specialized crack repair adhesive and allow it to cure before proceeding to the next step. Dust and Oil Removal: Use a blower or vacuum cleaner to remove dust from the surface. Then, wipe the surface with a cloth dampened with acetone or alcohol to remove oil and impurities, ensuring the surface is dry and clean. |
Step 2: Apply Primer The function of primer is to penetrate the concrete pores, increase the base surface strength, and lay the foundation for the subsequent application of leveling adhesive/carbon cloth. Key points: Primer Preparation: Pour primer components A and B into a mixing bucket according to the adhesive instructions. Mix with an electric stirrer for 3-5 minutes to ensure uniformity. Primer Application: Use a scraper or brush to evenly apply the primer to the base surface, maintaining a thickness of 0.2-0.3mm (too thick will cause cracking, too thin will cause missing coating). The application area should be 50mm larger than the carbon cloth application area (to accommodate the edge transition). Curing Time: The primer typically cures for 4-8 hours (at 25°C). After curing, the base surface should have a matte finish and be non-sticky to the touch. | ![]() |
![]() | Step 3: Surface Leveling If any depressions or unevenness (>2mm) remain after polishing, fill them with leveling adhesive to ensure the carbon cloth adheres perfectly to the surface. Leveling: Use a scraper to fill the surface with adhesive, smoothing and compacting it to a flatness tolerance of ≤2mm. Any sharp corners should be rounded with adhesive. Curing: Allow the adhesive to cure for approximately 6-12 hours (at 25°C). After curing, lightly sand the surface with sandpaper to remove burrs and clean with a rag. |
Step 4: Apply Impregnation Adhesive and Attach Carbon Cloth Impregnation Adhesive Preparation: Mix impregnation adhesive components A and B according to the instructions and stir thoroughly (stir for ≥ 5 minutes to ensure full reaction). Avoid applying too much at once. Impregnation Adhesive Application: Apply an even layer of impregnation adhesive to the leveled surface, maintaining a thickness of 0.3-0.5mm. (This should cover the entire carbon cloth attachment area, with an additional 50mm applied around the edges.) Carbon Cloth Cutting and Attaching: Cutting: Use a wallpaper cutter to cut the carbon cloth to the desired dimensions. (For unidirectional carbon cloth, pay attention to the direction of force.) Cutting must align with the fiber direction of the carbon cloth. Crosswise cutting, which may cause fiber breakage, is strictly prohibited. After cutting, the edges of the carbon cloth must be neat and free of loose threads. Attachment: Gently place the cut carbon cloth on the base surface coated with the impregnating adhesive. Press gently to initially adhere the carbon cloth. Then, use a dedicated defoaming roller (rolling uniformly from the center of the carbon cloth toward the ends, along the fiber direction, with moderate pressure) to expel air bubbles between the carbon cloth and the adhesive layer and ensure that the impregnating adhesive completely penetrates the carbon cloth. Multi-layer attachment: If the design uses multiple layers of carbon cloth (usually 1-3 layers), attach the second layer before the first layer of impregnating adhesive cures (approximately 1-2 hours at 25°C). First, apply impregnating adhesive to the first layer, then place the second layer on top. Repeat the defoaming roller process to ensure there are no bubbles between the layers. | ![]() |
![]() | Step 5: Topcoat Application and Curing Topcoat Application: After the carbon cloth is attached, immediately apply an even layer of impregnating adhesive (as a topcoat) to the carbon cloth surface, with a thickness of ≥ 0.2mm. Ensure complete coverage to prevent aging due to exposure to air. Curing: Curing at room temperature (25°C): Curing time ≥ 7 days. Curing Requirements: During curing, the carbon cloth must not be touched or disturbed. Avoid rain or dust. If the ambient temperature is low, the curing time may need to be extended. Cure Verification: After curing, the carbon cloth surface is firm and non-sticky. A light tap with a hammer should produce a crisp sound. |
III. Construction Differences for Different Structures (Targeted Adjustments)
Concrete Column (Circumferential Reinforcement)
Surface Preparation: The column surface should be polished into a circular shape (or rounded rectangle), with a corner radius of ≥ 25mm.
Carbon Cloth Attachment: The carbon cloth should be attached circumferentially around the column, with an overlap length of ≥ 100mm (or as required by the design). Rolling should extend from the center of the column toward both ends to avoid air bubbles. Concrete Beams (Shear Reinforcement, U-Shaped Bonding)
Both ends of the carbon cloth should be wrapped around the beam in a U-shape (extending to the top of the beam, with a length ≥ 100mm). If there is a floor slab on top of the beam, the carbon cloth should be embedded at the intersection of the floor slab and the beam to ensure a secure fit.
Note: During shear reinforcement, the carbon cloth must be applied perpendicular to the beam axis (i.e., horizontally).
Steel Structure Reinforcement
Surface Preparation: Remove rust and paint from the steel surface with a wire brush, then wipe with acetone to degrease. If there are any weld protrusions, smooth them with an angle grinder.
Adhesive: Use a carbon cloth adhesive specifically formulated for steel structures.
Precautions
Safety precautions: Applicators must wear gloves (to prevent adhesive contact with skin), masks (to prevent inhalation of carbon cloth dust), and goggles (to prevent flying debris during sanding).
Carbon cloth protection: Carbon cloth is a conductive material. During sanding, keep it away from electrical wires and electrical appliances to avoid electric shock.
Adhesive application: Adhesive must be prepared and used immediately. Do not return unused adhesive to the original packaging to avoid contamination.
Fireproofing: After curing, if the carbon cloth is used in an open flame environment (such as a kitchen or factory), apply a Class B1 or higher fire-retardant coating (thickness ≥ 3mm) to the surface to prevent oxidation and degradation due to high temperatures.
How to Use Carbon Fiber Fabrics
I. Preliminary Construction Preparation
Material Preparation and Inspection
Core Materials: Carbon cloth (must meet the designed number of layers and width, such as 12K unidirectional carbon cloth, common specifications include 200g/㎡ and 300g/㎡), special epoxy resin adhesive (including primer, leveling adhesive, and impregnating adhesive, which must match the carbon cloth model and be within the shelf life. Ordinary glue is strictly prohibited).
Material Inspection: The carbon cloth surface must be free of damage, wrinkles, or oil stains; the adhesive must be free of delamination or sedimentation, and must be uniform and free of particles after stirring.
Environmental Control
Temperature: Construction and curing temperatures must be between 5°C and 35°C. Heating measures must be implemented for temperatures below 5°C, and shading and cooling must be applied for temperatures above 35°C.
Humidity: Ambient humidity must be less than 85%. Construction should be suspended in rainy weather or when the base surface is damp. Resume work after the base surface is completely dry.
Site Cleanup: The area around the reinforcement must be free of debris and dust. Stable scaffolding must be constructed for overhead work. Working overhead without protective gear is strictly prohibited.
Tool Preparation
Surface Preparation Tools: Angle grinder (with diamond grinding disc), chisel, hammer, wire brush, hair dryer or vacuum cleaner, rag;
Adhesive Application Tools: Mixing bucket, electric stirrer, scraper, roller (special defoaming roller, width matching the carbon cloth);
Carbon Cloth Handling Tools: Tape measure, wallpaper cutter, ruler.
II. Core Construction Process
Concrete structures (beams, columns, and slabs) are the primary targets for carbon cloth reinforcement. During the construction process, special attention should be paid to "surface flatness" and "wetting of the adhesive into the carbon cloth." The specific steps are as follows:
![]() | Step 1: Surface Preparation Surface Cleaning: Use a hammer or chisel to remove loose concrete, laitance, and hollows from the reinforced area. Roughening: Use an angle grinder (with a diamond grinding wheel) to roughen the surface perpendicular to the direction of carbon cloth application (to increase the bonding area). Crack Treatment: If cracks are present, treat them according to their width. For cracks less than 0.2mm, clean them with a wire brush and then apply primer directly. For cracks greater than 0.2mm, first apply a specialized crack repair adhesive and allow it to cure before proceeding to the next step. Dust and Oil Removal: Use a blower or vacuum cleaner to remove dust from the surface. Then, wipe the surface with a cloth dampened with acetone or alcohol to remove oil and impurities, ensuring the surface is dry and clean. |
Step 2: Apply Primer The function of primer is to penetrate the concrete pores, increase the base surface strength, and lay the foundation for the subsequent application of leveling adhesive/carbon cloth. Key points: Primer Preparation: Pour primer components A and B into a mixing bucket according to the adhesive instructions. Mix with an electric stirrer for 3-5 minutes to ensure uniformity. Primer Application: Use a scraper or brush to evenly apply the primer to the base surface, maintaining a thickness of 0.2-0.3mm (too thick will cause cracking, too thin will cause missing coating). The application area should be 50mm larger than the carbon cloth application area (to accommodate the edge transition). Curing Time: The primer typically cures for 4-8 hours (at 25°C). After curing, the base surface should have a matte finish and be non-sticky to the touch. | ![]() |
![]() | Step 3: Surface Leveling If any depressions or unevenness (>2mm) remain after polishing, fill them with leveling adhesive to ensure the carbon cloth adheres perfectly to the surface. Leveling: Use a scraper to fill the surface with adhesive, smoothing and compacting it to a flatness tolerance of ≤2mm. Any sharp corners should be rounded with adhesive. Curing: Allow the adhesive to cure for approximately 6-12 hours (at 25°C). After curing, lightly sand the surface with sandpaper to remove burrs and clean with a rag. |
Step 4: Apply Impregnation Adhesive and Attach Carbon Cloth Impregnation Adhesive Preparation: Mix impregnation adhesive components A and B according to the instructions and stir thoroughly (stir for ≥ 5 minutes to ensure full reaction). Avoid applying too much at once. Impregnation Adhesive Application: Apply an even layer of impregnation adhesive to the leveled surface, maintaining a thickness of 0.3-0.5mm. (This should cover the entire carbon cloth attachment area, with an additional 50mm applied around the edges.) Carbon Cloth Cutting and Attaching: Cutting: Use a wallpaper cutter to cut the carbon cloth to the desired dimensions. (For unidirectional carbon cloth, pay attention to the direction of force.) Cutting must align with the fiber direction of the carbon cloth. Crosswise cutting, which may cause fiber breakage, is strictly prohibited. After cutting, the edges of the carbon cloth must be neat and free of loose threads. Attachment: Gently place the cut carbon cloth on the base surface coated with the impregnating adhesive. Press gently to initially adhere the carbon cloth. Then, use a dedicated defoaming roller (rolling uniformly from the center of the carbon cloth toward the ends, along the fiber direction, with moderate pressure) to expel air bubbles between the carbon cloth and the adhesive layer and ensure that the impregnating adhesive completely penetrates the carbon cloth. Multi-layer attachment: If the design uses multiple layers of carbon cloth (usually 1-3 layers), attach the second layer before the first layer of impregnating adhesive cures (approximately 1-2 hours at 25°C). First, apply impregnating adhesive to the first layer, then place the second layer on top. Repeat the defoaming roller process to ensure there are no bubbles between the layers. | ![]() |
![]() | Step 5: Topcoat Application and Curing Topcoat Application: After the carbon cloth is attached, immediately apply an even layer of impregnating adhesive (as a topcoat) to the carbon cloth surface, with a thickness of ≥ 0.2mm. Ensure complete coverage to prevent aging due to exposure to air. Curing: Curing at room temperature (25°C): Curing time ≥ 7 days. Curing Requirements: During curing, the carbon cloth must not be touched or disturbed. Avoid rain or dust. If the ambient temperature is low, the curing time may need to be extended. Cure Verification: After curing, the carbon cloth surface is firm and non-sticky. A light tap with a hammer should produce a crisp sound. |
III. Construction Differences for Different Structures (Targeted Adjustments)
Concrete Column (Circumferential Reinforcement)
Surface Preparation: The column surface should be polished into a circular shape (or rounded rectangle), with a corner radius of ≥ 25mm.
Carbon Cloth Attachment: The carbon cloth should be attached circumferentially around the column, with an overlap length of ≥ 100mm (or as required by the design). Rolling should extend from the center of the column toward both ends to avoid air bubbles. Concrete Beams (Shear Reinforcement, U-Shaped Bonding)
Both ends of the carbon cloth should be wrapped around the beam in a U-shape (extending to the top of the beam, with a length ≥ 100mm). If there is a floor slab on top of the beam, the carbon cloth should be embedded at the intersection of the floor slab and the beam to ensure a secure fit.
Note: During shear reinforcement, the carbon cloth must be applied perpendicular to the beam axis (i.e., horizontally).
Steel Structure Reinforcement
Surface Preparation: Remove rust and paint from the steel surface with a wire brush, then wipe with acetone to degrease. If there are any weld protrusions, smooth them with an angle grinder.
Adhesive: Use a carbon cloth adhesive specifically formulated for steel structures.
Precautions
Safety precautions: Applicators must wear gloves (to prevent adhesive contact with skin), masks (to prevent inhalation of carbon cloth dust), and goggles (to prevent flying debris during sanding).
Carbon cloth protection: Carbon cloth is a conductive material. During sanding, keep it away from electrical wires and electrical appliances to avoid electric shock.
Adhesive application: Adhesive must be prepared and used immediately. Do not return unused adhesive to the original packaging to avoid contamination.
Fireproofing: After curing, if the carbon cloth is used in an open flame environment (such as a kitchen or factory), apply a Class B1 or higher fire-retardant coating (thickness ≥ 3mm) to the surface to prevent oxidation and degradation due to high temperatures.
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