EXPERIMENTAL STUDY ON THE EFFECT OF STEEL FIBER WASTE TYRE ON HIGH STRENGTH CONCRETE

High strength concrete (HSC) is defined as concrete with a specified compressive strength of 40 MPa or greater. High strength concrete is basically a brittle material, with low tensile strength. One way to improve the brittle and weak concrete properties towards tensile strength is by utilizing fiber. The utilization of steel fiber from waste tyres (SFWT) in high strength concrete can be used as an alternative to improve the mechanical properties of the concrete and also has benefit to reduce the waste of used tyres that increase every year. This research was carried out to investigate the effect of the addition of SFWT on HSC and high strength concrete containing silica fume (HSCSF). The SFWT is obtained from steel wires that are removed from used tyres and then, cut into 4 cm length. The cylindrical specimen with a diameter of 15 cm and height of 30 cm, and beams with dimension 10x10x50 cm are cast. The content of silica fume on HSC is 10% by replacing the cement weight. The addition of SFWT in both HSC and HSCSF are 0%, 0.5%, 1.0%, 1.5%, and 2%. The properties of high strength concrete: compressive strength, splitting tensile strength, and flexural strength are tested at 28 days after casting. The results show that the addition of SFWT increases the mechanical properties of HSC and HSCSF. The increase of SFWT content results in the higher mechanical properties of the HSC and HSCSF. In addition, the presence of SFWT in the high strength concrete delays the crack width of the concrete and prevents the brittle collapse.