FLEXURAL CAPACITY OF HIGH PERFORMANCE SELF COMPACTING RC BEAMS UNDER DIRECT FIRE

Document Type : Original Article

Authors

1 Materials Engineering Dept., Faculty of Engineering, Zagazig, Egypt

2 Structural Engineering Dept., Faculty of Engineering, Zagazig, Egypt

Abstract

This work analyses the structural behavior of high performance self compacting reinforced concrete (RC) beams under direct fire.  Concrete strength of about 130 MPa was investigated. Six reinforced concrete beams represents three types of concrete mixes were investigated. The first mix was high performance self compacting concrete (HPSCC) without fibers. The second mix was HPSCC with the presence of steel fibers (SF). The third mix was HPSCC with hybrid fibers, SF and two types of polypropylene fibers (micro-polypropylene and polyolefin). Three beams representing the three mixes were tested at room temperature without exposure to fire. The other corresponding three beams were tested under direct fire, while they were loaded at 45% from the fracture load of the corresponding three beams tested at room temperature to failure. All beams were tested under 3-points bending. Experimental results clearly indicated the superior effect of adding hybrid fibers to such concrete in reducing explosive spalling and increasing flexural capacity of RC beams when exposed to direct fire.  

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