In recent years, many studies have been conducted in improving the mechanical characteristics of reinforced fibre concrete. According to the researches, the increase of formability and bending strength are the extra advantages of adding the fibres to the concrete. There are two kinds of fibre that are used in the concrete are: steel fibre and polypropylene fibre. Steel fibers have high elastic modulus and stiffness, so they can improve the compressive strength and toughness of concrete. Polypropylene fibers have good ductility; hence, they can restrain plastic cracks. However, steel fibers at concrete surfaces undergo rusting and also might cause electric conductivity and magnetic field problems. If steel fiber reinforced concrete is used in the runway of an airport, high speed railway systems and/or nuclear power plants, safety problems can ensure. Keywords: Fibre reinforced concrete, Fly ash, Polypropylene fibre.