Concrete or mortar resistant to spalling under fire attack

Details Concrete or mortar resistant to spalling under fire attack Concrete or mortar resistant to spalling under fire attack

C - Chemistry, Metallurgy

04

B

C04B 38/06 (2006.01) C04B 16/06 (2006.01) C04B 20/10 (2006.01) C04B 28/02 (2006.01) C04B 38/00 (2006.01) C09K 21/00 (2006.01) E04C 5/07 (2006.01)

Patent

CA 2098644

Reinforced concrete members consisting of a high-strength concrete are subject to explosive spalling. Such spalling can be prevented by the introduction of a capillary system into the concrete of such members, containing substantially linear capillaries having a diameter of at least 3 mm and a length of at least 5 mm. This capillary system can be built during or after the hardening of the concrete without impairing the other desired properties of the concrete or mortar, or it can first be produced under the fire attack. This can be effected with fibers which form the capillaries by dissolution, softening, decomposition, shrinkage or melting and which, due to their shape, i.e. diameter and length, and the incorporated amount, correspond t< the desired capillaries. As to the columns made of fiber concrete, if desired with addition of the finely-dispersed silicic acid, a classification under fire-resistant class F 180-A is possible.

Les éléments de construction en béton armé formés de béton à haute résistance peuvent se fissurer par éclatement. Cette fissuration peut être évitée en introduisant dans le béton de ces éléments un système de capillaires formé de capillaires quasi linéaires d'au moins 3 mm de diamètre et d'au moins 5 mm de longueur. Ces capillaires peuvent se produire pendant ou après le durcissement du béton sans nuire aux autres propriétés recherchées du béton ou du mortier ou ils peuvent être produits au préalable sous l'effet du feu. On les obtient à l'aide de fibres qui en se dissolvant, ramollissant, se décomposant, rapetissant ou fondant, et grâce à leur forme, c.-à-d. diamètre et longueur, et leur nombre, produisent les capillaires désirés. Pour les colonnes en béton de ciment et de fibres, il est possible d'obtenir une classification de résistance au feu de classe F 180-A avec l'ajout d'acide silicique finement dispersé.

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