Fire protection for carbon fiber reinforcements
Fire protection for carbon fiber reinforcements
The fire stability of reinforced concrete structures and substrates is obtained by restricting the temperature rise in the steelwork within the concrete. If the existing load-bearing structures need to be strengthened (in the case of a change of use, anti-seismic confinement, refurbishment, etc.), one solution involves bonding carbon fibre reinforced boards with an epoxy resin adhesive.
With the aim of guaranteeing the strength and performance of these carbon reinforcements in the event of fire, the solution has to guarantee a temperature of the adhesive used. This maximum temperature, varying between 45 and 80° C, appears in the technical notes of the manufacturers to whom the reader should refer.
Following the fire resistance tests carried out at the Efectis laboratory, and via the intermediary of Laboratory Assessment EFR-18-001644, GEOSTAFF® proposes validated solutions using GEOTEC®S to protect the carbon fibre reinforcements installed under the floor slab and concrete beam, depending on the desired levels of fire performance and the critical temperatures provided by the manufacturer.
The flat carbon concept
What is a carbon plate?
Before looking at protection solutions, it is essential to understand what carbon plate is. Let’s imagine an extremely strong strip, measuring between 5 and 15 cm wide and just 1.2 mm thick. This strip is made up of a multitude of carbon fibers, renowned for their great strength and lightness. This property makes it an ideal choice for reinforcing concrete structures.
The reinforcement process
Reinforcement does not stop with the application of carbon plates. The process requires careful preparation of the concrete substrate. Once the substrate is deemed sound, the carbon plates are bonded using an epoxy resin-based adhesive. This is a tried-and-tested method, notably for compensating for the lack of tensioned steel in certain structures: flexural reinforcement of slabs and beams; confinement of concrete columns; punching reinforcement…
Crucial protection for bonded carbon reinforcements
Although carbon fibre plates reinforce concrete structures, they have a weak point in the event of fire. The epoxy resin used to bond them is vulnerable to high temperatures. Exposure to heat can cause the resin to degrade, rendering the carbon plates ineffective.
To ensure good fireproof insulation and the fire stability of carbon plates and, by extension, concrete structures, it is essential to guarantee the temperature of the adhesive used. This maximum temperature, varying between 45 and 80° C, is specified in the manufacturers’ technical notices, to which reference should be made.
Faced with this vulnerability, we have developed a unique and reliable solution: GEOTEC® fire-resistant boards. Their fire resistance has been tested and validated by the Efectis laboratory, guaranteeing the safety of concrete structures in the event of fire. These boards are also widely used for smoke extraction and ventilation ducts, offering effective, long-lasting protection.
Our flat carbon protection solution
Following the fire resistance tests carried out in the Efectis laboratory, GEOSTAFF® proposes the use of GEOTEC® fire protection boards for:
- Carbon plate protection under a concrete beam
- Carbon plate protection under a concrete slab
- Carbon plate protection in wall angle
Performances système
| Protection under concrete floor slab | |||||
|---|---|---|---|---|---|
| Desired interface temperature (C°) | 30 min | 60 min | 90 min | 120 min | 180 min |
| 45 | 2x30 mm (Overlap 100 mm) | 2x45 mm (Overlap 100 mm) | 2x45 mm (Overlap 350 mm) | 3x45 mm (Overlap 250 mm)* | - |
| 60 | 2x30 mm (Overlap 100 mm) | 2x30 mm (Overlap 100 mm) | 2x45 mm (Overlap 100 mm) | 2x45 mm (Overlap 200 mm) | - |
| 80 | 2x30 mm (Overlap 100 mm) | 2x30 mm (Overlap 100 mm) | 2x30 mm (Overlap 100 mm) | 2x45 mm (Overlap 100 mm) | 2x45 mm (Overlap 100 mm) |
| Protection under the beam : Bottom of the beam | |||||
| Desired interface temperature (C°) | 30 min | 60 min | 90 min | 120 min | |
| 45 | 2x45 mm | 2x45 mm | 3x45 mm | - | |
| 60 | 2x45 mm | 2x45 mm | 2x45 mm + 30 mm | 3x45 mm | |
| 80 | 2x30 mm | 2x45 mm | 2x45 mm | 2x45 mm | |
| Protection under the beam : On the side of the beam | ||||
|---|---|---|---|---|
| Desired interface temperature (C°) | 30 min | 60 min | 90 min | 120 min |
| 45 | 2x45 mm | 2x45 mm | 2x45 mm + 30 mm | - |
| 60 | 2x30 mm | 2x45 mm | 2x45 mm | 2x45 mm + 30 mm |
| 80 | 2x30 mm | 2x30 mm | 2x45 mm | 2x45 mm |
Technical catalogs
Product technical data sheets
GEOTEC® S30 boards
1 hr. fire protective board 30 mm thick and with dimensions from 200 to 1100 (W) x 1000 (L) mm (in steps of 50 mm).
GEOTEC® SX30 boards
1 hr. fire protective board, thickness 30 mm and unique dimension 1200 (W) x 1000 (L) mm.
GEOTEC® S45 boards
2-hr. fire protective board 45 mm thick and with dimensions from 200 to 1100 (W) x 1000 (L) mm (in steps of 50 mm).
GEOTEC® SX45 boards
2-hr. fire protective board 45 mm thick and unique dimension 1200 (W) x 1000 (L) mm for passive fire protection
GEOFLAM® F LIGHT boards
2-hr. fire protective board 35 mm thick and with dimensions from 200 to 1100 (W) x 1000 (L) mm (in steps of 50 mm).
GEOFLAM® FX50 boards
3-hr. fire protective board 50 mm thick and single dimension 1000 (W) x 900 (L) mm for passive fire protection.
Product technical
data sheets
Digital tools
Geopro Calculation tool
Prescription
documents
Brochures and flyers
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