Experimental Strength Evaluation Of Steel-polypropylene Hybrid Fibre Reinforced Concrete

Abstract

Reinforced concrete structures collapse by developing tensile and flexural crack patterns. The properties of the concrete must be researched to prevent these forms of failure and enhance the overall strength and durability. The inclusion of fibres in the concrete increasing the strength of the concrete and prevents micro-cracks that lead to a major failure. In this study, two different types of fibres are considered for inclusion in the concrete as Hybrid fibre in which one has higher moduli (Steel fibre) and one has lesser moduli (Polypropylene fibre). This hybrid material formulation can reduce the probability of brittleness and micro-cracks forming in concrete. The mix design used for this investigation is M40 grade of concrete designed as per IS10262:2019. The hybrid combination of Steel and Polypropylene fibre ratio is 50:50 with different hybridization percentages as 1%, 1.5% and 2%. The compression, splitting tensile and flexural tests were carried out to study the hybrid concrete behavior for the three different hybridization dosage percentages and the same were carried out for the controlled concrete. The experimental study revealed that the inclusion of the hybrid fibre increases the strength of the concrete compared to the conventional concrete. The hybridization of 1.5 % gives the higher strength results and it is considered as an optimum percentage.