Study on Self-Consolidating Hybrid Fibre-Reinforced Concrete

Compaction generally becomes challenging, time-consuming, and requires more labour during casting, and this can be effectively handled using the self-consolidating concrete (SCC). In this study, fibre-reinforced self-consolidating concretes were developed with metallic fibres, polymeric synthetic fibres, or a combination of both for enhancing concrete's mechanical properties. However, the properties of concrete are only slightly enhanced by using a single type of fibre for reinforcement. On the contrary, hybrid fibre-reinforced concretes, which are strengthened with a number of distinct kinds of specifically selected fibres, offer superior characteristics. The incorporation of the hybrid fibres into brittle self-consolidating concrete (SCC) helps to strengthen the concrete and overcome this problem. For this purpose, hybrid fibre-reinforced self-consolidating concrete (HFSCC) specimens with 0.75%, 0.80%, 0.85%, and 0.90% steel and 0.15% polypropylene fibres were tested. The workability properties of the SCC as a result of the addition of hybrid fibres were also investigated by performing fresh concrete tests such as the slump flow, V-funnel, and the L-box test to assess compactibility such as filling ability and passing ability. Additionally, cylinders and cubes were casted to determine the splitting tensile strength and compressive strength. As a result, the hybrid fibres improved the compressive and split tensile strengths. Thus, incorporating hybrid fibres into the mix revealed that increasing the fibre content of the concretes reduced their workability slightly.