A COMPARATIVE STUDY ON HYBRID FIBER REINFORCED SELF-COMPACTING CONCRETE BY USING CRIMPED , HOOKED STEEL FIBER & FLYASH WITH DIFFERENT GRADES

The SCC spreads uniformly due to its own weight, without any additional compaction energy, and does not enrain air. SCC in the fresh state of the main features are filling capacity, through the ability and separation resistance. The fibers have been produced in a wide range of materials, shapes and properties. Improve the properties (strength and toughness) of brittle cementitious materials by bridging cracks; pass the crack stress and counteract the crack propagation. Add fibers to the SCC to increase performance, mainly in terms of bending, impact and compressive strength. The fiber can be affected by crowded reinforcement of the flow capacity and the ability to pass, which is considered the main aspect of the SCC. Compared with ordinary self - compacting concrete, the flow strength characteristics of fiber reinforced self compacting concrete and mixed fiber reinforced self compacting concrete are studied. In this study, the M40 & M50 grade self-compacting concrete mix was used by previous researchers. The steel fibers used in this study were crimped steel fibers having a diameter of 0.4 mm x 20 mm (aspect ratio 50) and hooked steel fibers having a diameter of 0.5 mm and a length of 30 mm (aspect ratio of 60). In this study, crimped steel fibers and hook-shaped end steel fibers were added in different proportions to obtain cement with a total fiber content of 2% by weight to obtain various SFRSCC and HFRSCC mixtures. The mixture was designated as SCC0, SFRSCC2C, SFRSCC2H, HFRSCC (0.5C + 1.5H), HFRSCC (1.0C + 1.0H) and HFRSCC (1.5C + 0.5H). This project examines the fresh and hardening properties of SFRSCC and HFRSCC mixtures. With the increase in fiber content in the SCC mix, the flow ability is adversely affected. Mixing fiber- reinforced SCC mixtures have better flow properties than single fiber reinforced SCC mixtures. The addition of fibers to the SCC mixture reduced the flow properties of the SCC mixture but met the acceptance criteria for the SCC mixture. The addition of 0.5C + 1.5H or 1.5C + 0.5H mixed fibers to the SCC mixture provides better flow ability than the combination of 1.0C + 1.0H. The compressive strength of all FRSCC and HFRSCC mixtures was improved compared to the control combination SCC0. The compressive strength of the mixed fiber reinforced SCC mixture was reduced as compared to the single fiber reinforced SCC mixture. The compressive strength of HFRSCC (0.5C + 1.5H) or HFRSCC (1.5C + 0.5H) is greater than that of HFRSCC (1.0C + 1.0H), but in the case of split tensile strength and bending strength.