Concrete construction fire protection

Concrete construction fire protection

Though they posses some inherent fire resistance capabilities, in the presence of fire, structural reinforced concrete members will in a longer term degrade and lose their loadbearing capacity. Pre-stressed reinforced concrete, thin concrete elements, older structures with small concrete covers are the cases of major concern.
Collapse will generally occur by failure of the steel reinforcing bars, however spalling of concrete may dramatically accelerate the destruction process.
To prevent collapse when the existing concrete cover is not enough for the target fire resistance time, a protective material must be applied.  Intumescent coatings are the best possible option in many cases.

CHAR 21 is tested and approved for fire protection of reinforced concrete and pre-stressed reinforced concrete structures according to the European standard EN 13381-3. Fire resistance ratings can be up to 120 or 180 minutes, however the actual performance depends on the cooperation of the existing concrete cover and additional layer of intumescent coating. In the perspective of EN 13381-3, performance to fire is actually measured in terms of "equivalent concrete cover thickness" provided by the coating film.
Tests are performed on shapes (a concrete beam, results of which are valid for both beams and columns) and flat surfaces (an horizontal slab, results of which are valid for both ceiling slabs and concrete walls).

Fire protection can be engineered by calculating the concrete cover thickness needed for a certain performance and making up the needed thickness adding the actual concrete thickness and the "virtual" thickness brought in by the protective material. The method applies for both passive protection materials (renderings) and reactive materials (intumescent coatings).
In simple cases, following the prescriptive approach, the needed concrete cover can be simply found in fire codes or building codes.
However concrete structures often come in complex shapes, concrete cover thickness is not evenly distributed and inner reinforcing steel bars have different critical conditions, all in all the system has a complex static behaviour. Therefore fire safety structural calculation for concrete are often performed with the help of modeling tools.

more contents

IRIS Coatings at Safety Expo 2019

Great interest in the IRIS Coatings stand, as we joined for the first time Safety Expo

read more

Fire Trap leader in Egypt

Our distributor for Egypt and middle east, Fire Trap Chemicals Co., make us proud as they confirm to be a leader .....

read more

A lesson on intumescent coatings

A lesson about intumescent coatings by our CEO at Politecnico di Torino, explains in 20 minutes the basics of formulation, use, testing and certification of intumescent .....

read more

IRIS Coatings convention in Florence

The sales team of IRIS Coatings gathered together on 15 March in Florence for the italian sales force meeting .....

read more

Intumescent coatings application

EAPFP has published best practice guidelines for application of intumescent coatings, all that building owners, applicators and manufacturers need to know .....

read more

Reactive coatings

Intumescent coatings and sealants swell up in the presence of fire forming an expanded char that is a very effective thermal insulating protective barrier ......

read more

Structural steelwork fire protection

Structural resistance to fire plays a key role in fire safety. In commercial and industrial facilities, hotels, airports, supermarkets, schools, hospitals, cinemas, intumescent coatings .....

read more

Fire compartment walls

Fire resistance of compartment walls is crucial to fire control and people safety and can be improved with intumescent coatingsService penetrations in walls .....

read more