Flexural Behavior of Hybrid Fiber Reinforced High Strength Concrete

Abstract

Objectives: An experimental study was carried out to study the flexural behavior of high strength concrete of Grade M60 using hooked end steel fibers, polyolefin straight fibers in various volume fractions. Methods: Hooked end steel fibers were added into the high strength concrete at volume fraction of 1% and 2%, steel and polyolefin fibers were added 80% - 20% and 60% - 40% combination at each volume fraction in order to cast steel fiber (single) reinforced high strength concrete and hybrid fiber (combination of steel and polyolefin) reinforced high strength concrete specimens. The steel mould of size 100 x100 x 500 mm was used for casting of all specimens. Specimen cast with high strength concrete of grade M60 was treated as a control specimen. Other Specimens were treated as study parameters. Findings: All the specimens were tested under third point loading, deflections were measured by using dial gauge at mid span. Deflection ductility calculated from load deflection curve and toughness Indices calculated as per ASTM C 1018-97. The test results Shows that hybrid fiber of volume fraction 2% with Steel 80% -polyolefin 20% combination specimen improves the flexural performance appreciably compared with that of control specimen and steel fiber reinforced high strength concrete specimens. Applications: The use hybrid fiber reinforced high strength concrete in structural components investigated by various researchers includes columns, beams, slabs, and beam-column joints. The primary contribution of fibers is in the area of ductility. Hence most of the studies were focused on evaluating the ductility and energy absorption capacity.