The Influence Of Steel Fiber Waste Tyre On High Strength Concrete Containing Palm Oil Fuel Ash And Rice Husk Ash

Abstract

High strength concrete (HSC) has high compressive strength, but low tensile and flexural strength, toughness, low resistance to cracking, and brittle fracture characteristics. To enhance these engineering properties, steel fiber can be used in the HSC. Steel fiber from waste tyres (SFWT) can be used as an alternative steel fiber for HSC due to low cost of the material. It needs more study to explore deeply the effect of SFWT on HSC containing Cement Replacement Materials (CRM). This paper presents an experimental investigation on the effect of SFWT on high strength concrete containing palm oil fuel ash (POFA) and rice husk ash (RHA). The contents of each CRM (POFA and RHA) on the HSC are 5% and 10% by weight of cement. The addition of SFWT in HSC containing POFA and RHA are 0%, 0.5%, 1.0%, 1.5%, and 2% by concrete volume. The 28-days compressive and tensile strengths are tested for all HSC mixtures. The results show that the addition of SFWT on HSC containing POFA (HSCP) and RHA (HSCR) reduce concrete workability but increase the mechanical properties of the concrete. More SFWT are added, the higher compressive and tensile strength is obtained. The higher compressive and tensile strengths on each HSCP and HSCR mixtures are observed at the addition of 2% SFWT with 5% content of POFA (HSCP 5%) and RHA (HSCR 5%). For HSCP 5%, the addition of 2% SFWT improves the compressive and tensile strengths up to 26.62% and 37.59%, respectively, while for HSCR 5%, it improves up to 21.60% and 23.34%, respectively.