Influence of steel fibre reinforcement on the properties of concrete

Abstract

To find out the influence of different fibre dosages on the mechanical and time-dependent properties of concrete, an experiment was carried out at the Faculty of Civil Engineering–Skopje. The experiment consists of 126 specimens in total, all manufactured with concrete class C30/37, but reinforced with different amount of fibres (0, 30 and 60 kg/m3). According to the experimental results up to age of 400 days, addition of steel fibres has influence on most of the mechanical properties: around 4% increase of the compressive strength, around 14% increase of the splitting tensile strength, around 19% increase of the flexural tensile strength and almost no influence on the Modulus of Elasticity. The addition of steel fibres has almost no influence on the free drying shrinkage (decrease of 2%), while for the considered compressive stress level, steel fibres have a bigger influence on the creep (decrease of 12%).