Vol.22, No.2, 2022, pp. 211–217
UDC:

To improve the brittleness of concrete, as well as reduce cracks due to load application, and to increase the strength of concrete, a variety of fibres are used in the concrete mixing design. The main purpose of this study is to investigate the effect of polyolefin fibres in different shapes on the properties of fresh and hardened concrete, including concrete performance, compressive and tensile strength, and modulus of elasticity of concrete in the laboratory (dry) and in the wet environment at ages of 3, 7, 28, and 56 days. Polyolefin fibres led to an increase in tensile and compressive strength, and finally an increase in modulus of elasticity of the tested concrete compared to fibre-free concrete sample. Increase in tensile strength of concrete is very significant. A maximal increase is observed in the Filamentary Polyolefin Fibres concrete (FPF) with tensile strength of 4.297 MPa and compressive strength of 57.1 MPa, and an increase in the modulus of elasticity by 14.9 % compared to the strength of control concrete in wet curing environment.

Keywords: polyolefin fibres, water absorption percentage, modulus of concrete elasticity, compressive and tensile strength of concrete, fresh and hardened concrete