Shear Behavior of Reinforced Concrete Beams Using Hybrid Fibres

Abstract

This research work presents the effect of fibers on high-vigor reinforced Concrete beams with and without fiber. The study parameters for the investigation included ultimate load, ultimate deflections, crack width, energy ductility and deflection ductility and the associated failure modes.  In this study hooked end steel fiber of length 35mm with thickness of 0.6mm and polyolefin fiber of length 54mm with the size 1.22mm x0.732mm is utilized. The fibers were integrated in concrete at different volume fractions of 0.5%, and 1.0% with coalescence of steel-polyolefin at 80%-20%. The steel moulds of size 150mm x300mm cylinder, and 150mm x 200mm x2000mm beam, were habituated to cast the high vigor concrete specimens, and hybrid fiber reinforced concrete specimens. It consists of 3 cylinders for specimens for compression, 3 cylinder for splitting tensile vigor and 3 beams for shear vigor test for each volume fraction of hybrid fiber. The cast specimens were abstracted from the mould after 24 hours and sanctioned for remedying. Then the specimens were tested after 28 days remedying in the moist condition as per ASTM Codes. The test results of high-vigor hybrid fiber reinforced concrete beams were compared with high-vigor concrete beams [HSC] with no fibers. The test results show that the hybrid fiber content of 1.0% with80%-20% steel polyolefin coalesce exhibits better performance in terms of vigor, deformation, ductility and cracking characteristics.