Mechanical Properties of Fibre-Reinforced Concrete at Elevated Temperatures

For the purpose of use in fire resistance calculations, the relevant mechanical properties of steel-fibre-reinforced concrete at elevated temperatures were determined. These properties, which included the strength and deformation properties of fibre reinforced concrete at elevated temperatures, were determined by carrying out stress strain tests under both steady-state and transient-state conditions. The tests were carried out on fibre-reinforced siliceous aggregate concrete as well as on plain and fibre reinforced carbonate aggregate concrete. The results indicate that the compressive strength at elevated temperatures of steel-fibre-reinforced concrete is higher than that of plain concrete. It is concluded that the mechanical properties of fibre-reinforced concrete are more beneficial to fire resistance than those of plain concrete.Aux fins de l?utilisation dans les calculs de la r\ue9sistance au feu du b\ue9ton renforc\ue9 de fibres d?acier, on a d\ue9termin\ue9 les propri\ue9t\ue9s m\ue9caniques pertinentes de ce mat\ue9riau aux temp\ue9ratures \ue9lev\ue9es. Ces propri\ue9t\ue9s, lesquelles comprenaient la r\ue9sistance et la d\ue9formation, ont \ue9t\ue9 \ue9tablies au moyen d?essais d?effort et d\ue9formation en conditions tant d?\ue9tat stationnaire que d?\ue9tat transitoire. Les essais ont \ue9t\ue9 r\ue9alis\ue9s sur du b\ue9ton \ue0 granulat siliceux renforc\ue9 de fibres ainsi que sur des b\ue9tons ordinaires et des b\ue9tons \ue0 granulat carbonat\ue9, renforc\ue9s de fibres. Les r\ue9sultats indiquent que la r\ue9sistance \ue0 la compression aux temp\ue9ratures \ue9lev\ue9es du b\ue9ton renforc\ue9 de fibres d?acier est plus \ue9lev\ue9e que celle du b\ue9ton ordinaire. On en conclut que les propri\ue9t\ue9s m\ue9caniques du b\ue9ton renforc\ue9 de fibres contribuent davantage \ue0 la tenue au feu que celles du b\ue9ton ordinaire.Peer reviewed: NoNRC publication: Ye