AN INVESTIGATIVE STUDY ON CONCRETE REINFORED WITH STEELPOLYPROPYLENE HYBRID FIBER OF M30 GRADE CONCRETE

Abstract

The massive constructions like bridges, high-rise buildings, tunnel linings, and irrigation structures, etc., need high-strength concrete such as M30, M40, up to M80. Different methods are available for producing high-strength concrete, such as fiber-reinforced concrete, the use of superplasticizers, and additives in concrete. In this thesis, reinforced polypropylene is used as an additive to boost concrete strength; it is important to integrate polypropylene and steel fibres into the mix. Reinforcement resin is widely used in the building industry to add strength to cement-based materials. Having only a single type of fibre in concrete can boost its efficiency; however, in cases with two fibre types, hybrid fibre may compensate for the drawbacks of individual fibres. This article addresses the influence of the properties of steel–polypropylene composite on the consistency of reinforced concrete. This mixture uses two different forms of fibre, namely steel and polypropylene. The optimum proportion of steel and polypropylene is found to be 2 percent steel and 0.30 percent polypropylene. The slump test was performed for each mix in the fresh state. In the hardened condition of steel fibre–reinforced concrete, the split tensile strength and flexural strength of reinforced steel fibre concrete, polypropylene concrete, and composite concrete, as well as standard concrete, were evaluated at about 21 days and achieved full strength at 28 days.