EXPERIMENTAL STUDY ON HYBRID FIBER SELF COMPACTING CONCRETE

Self-Compacting Concrete is a recently developed concept in which the ingredients of the concrete mix are proportioned in such a way that it can flow under its own weight to completely fill the formwork and passes through the congested reinforcement without segregation and self-consolidate without any mechanical vibration. Several studies in the past have revealed the usefulness of fibres to improve the structural properties of concrete like ductility, post crack resistance, energy absorption capacity etc. Fiber reinforced self-compacting concreting combines the benefits of self-compacting concrete in fresh state and shows an improved performance in the hardened state due to the addition of fibers. In this project, glass fibres and polyester fibres were added to self-compacting concrete and Hybrid Fibre Reinforced Self Compacting Concrete was developed. An attempt has been made to study mechanical properties of self-compacting concrete and glass fibre reinforced self-compacting concrete with addition of mild steel reinforcement. A strength based mix proportion of self-compacting concrete was arrived based on Nan-Su method of mix design and the proportion was fine-tuned by using Okamura’s guidelines. Self-compacting concrete mixes with partial replacement of cement by mineral admixture like fly ash were taken for investigation with and without incorporating glass fibres and polyester fibres