Carbon Fibre Textile

Transcription

1 Identification No. R - 15 Carbon Fibre Textile 1.Description: Unidirectional carbon fibre textile with carbon fibres in the longitudinal direction. This textile is protected against pollution by a membrane. 2.Scope: BS EN :2006 Principle 4 is concerned with structural strengthening by increasing or restoring the structural load bearing capacity of an element of the concrete structure. It is essential when using this Principle that all stresses associated with a repair and the original or deteriorated structure are considered. Certain systems may impose additional stresses on the repaired structure, resulting in changes in the function of the original structure.1 3.How to Use: 3.1. Application: Apply the EPOXY ADHESIVE CFT resin on the element to be reinforced Press the CarboComp Textile into the wet resin Please ventilate with a profiled roll Then immediately apply a layer of EPOXY ADHESIVE CFT on the carbon fibre textile The consumption of EPOXY ADHESIVE CFT varies in function of the roughness and porosity of the surface. High-performance reinforcement carbon fibre sheet for structural strengthening

2 4.Structural strengthening: 4.1. Problem:

3 4.2. Solution:1

4 5. Under-strength beams: Reinforced concrete beams carry loads from buildings and structures to be transferred to walls and columns. Additional loads due to change of use, extra loads, underdesigned beams or damage to the structural beam can cause cracking and excessive deflection. Overloaded beams need to be strengthened to prevent partial collapse or failure Problem: Flexural cracking: Additional loads to a structure can cause flexural cracking to appear as the structure deflects under loading. This leads to flexural cracks opening up in the tension face of reinforced concrete beams and floor slabs. Insufficient steel reinforcement is an issue. These cracks can also allow contaminants to enter the concrete cover zone and initiate reinforcement corrosion Shear cracking: Additional loads can result in shear cracks forming at restraints around columns and at the end of reinforced concrete beams. These cracks are structural and indicate insufficient shear reinforcement.

5 5.2. Solution: Install externally-bonded reinforcement using plate bonding and sheet wrap techniques to strengthen the reinforced concrete beam and provide additional reinforcement stiffness.

6 6. Strengthening walls: Sheet wrapping is also a novel technique for strengthening walls, in particular in areas subject to seismic occurrences. Prokem have been involved in extensive laboratory testing of combinations of sheeting and cross-membering using carbon fibre strips. A variety of fibre types are available depending on the expected loading dynamics Problem: Deflections: Additional loads due to physical loading, wind or impact can result in flexural failure of walls. This is a result of insufficient lateral reinforcement in the wall or exceptional loads placed on the wall Damages: Wall structures are susceptible to sudden impact damage, causing localized failure in shear. Damage can arise from vehicle strikes, blast damage, impact from flying debris or accidental damage from other structural members Damages: Reinforced concrete walls are susceptible to damage caused by: settlement of foundations flexural bending cracks shear cracks thermal movement cracks overloading impact damage

7 6.2. Solution: Use externally-bonded reinforcement sheet wrap Install sheet wrap to the surface of the wall as containment reinforcement, flexural strengthening, impact strengthening and shear strengthening. The thickness of FRP wrap can be determined by design and the number of FRP sheet layers applied Masonry walls Sheet wrap flexural strengthening Install layers of glass or aramid sheet to strengthen the wall in accordance with the design engineer s specification Concrete or masonry walls Sheet wrap impact strengthening Install multiple layers of aramid sheet to strengthen the wall against impact damage or blast damage from explosions. Aramid is excellent for impact strengthening to walls Concrete walls Sheet wrap shear strengthening Install multiple layers of C640 carbon sheet ultra-high modulus to strengthen against shear cracking to concrete walls.

8 7. Under-strength columns: Column wrapping is a technique perfected by Weber using a variety of specialist unidirectional or woven fibre sheets bonded with a strong epoxy glue. Many bridges and buildings have been repaired using this novel technique Problem: Reinforced concrete columns carry and transfer load from beams and slabs down to the foundations of the structure. Additional loads or deterioration of the column can result in overloading of the column, causing buckling and cracking of the columns. Shear cracks can develop when the column is severely overloaded.

9 7.2. Solution: Use near-surface mounted reinforcement and sheetwrap Install manual lamination sheet wrap using either carbon, aramid or glass sheet depending upon the specific design and/or use near-surface mounted reinforcement, NSM, cut-in laminates. 8.1Packaging:1 Roll 150 m.1