Effect of strength and fiber reinforcement on fire resistance of high-strength concrete columns

In this paper, results from fire resistance experiments on five types of reinforced concrete columns are presented. The variables considered in the study include concrete strength (NSC and HSC), aggregate type (siliceous and carbonate aggregate), and fiber reinforcement (steel and polypropylene fibers). Data from the study is used to determine the structural behaviour of HSC columns at elevated temperatures. A comparison is made of the fire resistance performance of HSC columns with that of normal strength concrete (NSC) and fiber-reinforced HSC columns. The factors that influence the thermal and structural behaviour of HSC concrete columns under fire conditions are discussed. The results show that the fire resistance of a NSC column is higher than that of a HSC column. Also, the addition of polypropylene fibers and the use of carbonate aggregate improve fire resistance.Dans le document, on pr\ue9sente les r\ue9sultats d'essais de r\ue9action au feu auxquels ont \ue9t\ue9 soumis cinq types de poteaux en b\ue9ton arm\ue9. Les variables consid\ue9r\ue9es dans le cadre de l'\ue9tude incluent la r\ue9sistance du b\ue9ton (BRO ou BHR), le type de granulat (siliceux ou carbonat\ue9) et le renforcement de fibres (fibres d'acier ou de polypropyl\ue8ne). Les donn\ue9es tir\ue9es de l'\ue9tude servent \ue0 d\ue9terminer le comportement structural des poteaux en BHR \ue0 haute temp\ue9rature. On compare les performances en mati\ue8re de tenue au feu de ces poteaux avec celles des poteaux en b\ue9ton \ue0 r\ue9sistance ordinaire (BRO) et des poteaux en BHR renforc\ue9s de fibres. Il est question des facteurs qui influencent le comportement thermique ou structural des poteaux en BHR en cas d'incendie. Les r\ue9sultats montrent que la tenue au feu d'un poteau en BRO est meilleure que celle d'un poteau en BHR. En outre, l'ajout de fibres de polypropyl\ue8ne et l'utilisation d'un granulat carbonat\ue9 am\ue9liore la r\ue9action au feu.Peer reviewed: YesNRC publication: Ye