DUCTILITY OF STEEL FIBRE REINFORCED CONCRETE EXPOSED TO HIGH TEMPERATURE

This paper describes an attempt to assess ductility of steel fibre reinforced concrete exposed to high temperature. A high number of cube, cylinder, prism and 36 beam specimens were tested to assess compressive strength, tensile strength, modulus of rupture, axial and curvature ductility factors etc. Specimens were cast using various fibre volume fractions and fibre lengths. Different percentage of conventional steel reinforcements were provided in beam specimen. All the specimens were heated in an electric furnace to various levels of temperature (up to 500°C) for four hours and then cooled to room temperature before testing. The beams were tested under two point symmetrical loading on simple supports. Analysis was carried out on experimental data and expressions to determine the compressive strength, tensile strength, modulus of rupture determined. Furthermore, a stressstrain relationship under direct compression was developed. Finally, the effect of temperature on axial and curvature ductility factors was assessed. As sufficient data was not available to compare the relative efficiency of conventional reinforcements to steel fibre reinforced concrete in connection to ductility, such knowledge of relative efficiency may be useful for devising design method in this regard. In general, a good agreement between theoretical and experimental results were observed.

• INTRODUCTION

• EXPERIMENTAL INVESTIGATION

• ANALYSIS OF DATA

• CONCLUDING REMARKS

• REFERENCES