Effect of Steel Fibres on Properties of Concrete

Abstract

A Fiber Reinforced Concrete (FRC) is a composite material consisting of cement based matrix with an ordered or random distribution of fiber. Plain concrete fails suddenly once the deflection corresponding to ultimate flexural strength is exceeded, on the other hand, fiber reinforced concrete continue to sustain considerable loads ever at deflection considerably in excess of the fracture deflection of plain concrete. The present work is related to the utilization of fiber material and its various effects on compressive strength, split tensile strength, flexural strength and workability of concrete. In this report effect of fibres on strength of concrete for M30 grade have been studied by varying the aspect ratio of fibres in concrete. Fibre aspect ratio was varied by 50 and 80. Cubes of size 150x150x150mm to check the compressive strength, beams of size 500x100x100mm for checking flexural strength and cylinder of size 150x200mm for checking the split tensile strength were casted. All specimens were cured for 7 and 28 days before crushing. The results of fibre reinforced concrete for 7 days and 28 days curing with varied aspect ratio of fibre were studied and it has been found that there is significant strength improvement in steel fibre reinforced concrete. Also, it has been observed that with the increase in fibre aspect ratio increases the strength of concrete.