Effect of fire flame exposure on some properties of fiber reinforced high strength concrete

الملخص EN

-The increased use of high strength concrete (HSC) in buildings has resulted in concern regarding the behavior of such concrete in fire.

In the present work, an attempt is made to study the effect of fire flame exposure on compressive strength and splitting tensile strength of plain and fiber reinforced high strength concrete.

High strength concretes were prepared in two series, with and without steel fiber reinforcement.

Plain and steel fiber reinforced high strength concrete (PHSC) and (FRHSC) were subjected to the same fire temperatures and same burning time to reveal the effect of steel fiber on concrete strength at different heat levels as well as fire duration.

The concrete specimens for (PHSC) and (FRHSC) were subjected to fire flame temperature ranging between (300- 600 °C) at different ages 30 and 60 days.

Three temperature levels (300, 500 and 600 °C) where chosen with two exposure periods of 1.0 and 1.5 hours.

The test specimens were cubes (100 mm) and cylinders (100*200 mm).

After burning, the concrete specimens were allowed to cool in air.

The results obtained from this study indicated that damage of concrete caused by exposure to fire depends on the temperatures range and the duration of exposure to fire.

Also, the results showed that (PHSC) higher rates of strength loss than (FRHSC).