FIRE RESISTANCE OF STRUCTURAL MEMBERS.
We often find this type of solution both in new and refurbishment works as this kind of structure is really easy to assemble. It consists of a profi led
metallic sheet that serves as the formwork base where a concrete slab is later added.
However, in the event of a fire, the simplicity of the solution itself entails the risk of the metallic sheet being directly exposed to fi re, rendering the slab structure vulnerable.
mercor tecresa® markets Tecwool® F, tested pursuant to standard UNE ENV 13381-5. With the temperature information obtained from the steel sheet through the concrete’s thickness and nonexposed surface, we calculate:
- The relation among steel temperature, time and thickness of the fire protection material.
- Concrete equivalent thickness, in relation to the thermal insulation criteria.
- Information on adherence capacity and exposure limit time.
For intermediate thickness values of the fire protection system, the time for regular temperature to increase up to 350 ºC is obtained through linear interpolation.
Light, normal or heavy concrete could be used, strength classes being 20/25 (LC/C/HC) to 50/60 (LC/C/HC). The member can contain steel reinforcing bars.
Standard: UNE ENV 13381-5
Test Nº: 10/100324-148
1. Concrete forging.
2. Profiled steel sheet.
3. Tecwool® F (thickness according to concrete thickness and fire resistance time required).
Tecwool® F is spread with a pneumatic machine pursuant to the following
technical specifi cations:
The surface to be protected requires no prior primer, mesh or any other type of
support for the mortar adherence.
The surface to be protected should be free from dust, oil, waste, poorly attached particles, paint leftover, etc.
It is recommended to use water with the application hose to wash dirt away from the faces. This will also help achieve a thermal balance between the mortar and the applied surface.
Tecwool® F can provide different finishings: rugged, smooth, painted, etc., according to different aesthetic requirements. Once the spread is completed and in order to obtain a smooth finishing, a roller should be used and pressed slightly over the wet mortar until the desired finishing is obtained. It is possible to paint the mortar with elastic acrylic coatings to form a steam barrier. Before painting the mortar should be completely dry (28 days).
Once spread, mortar should be water sprayed superficially to ensure optimum
settling of the cement.