| dc.description.abstract | Steel fiber reinforced concrete has been increasingly used in structural applications
during the last four decades. It is generally accepted that addition of steel fibers
significantly increases tensile toughness and ductility, also slightly enhances the flexural
strength. Effects of steel fibers as addition reinforcement in reinforced concrete (RC)
beams are the main objectives of this study. The hooked-end steel fibers with the
dimensions of 0.75 mm in diameter, 33 mm in length and with the aspect ratio of 44
were used in this study. Initially the optimum percentage addition of steel fibers in
concrete was determined. In order to accomplish this research, eighteen concrete beams
with the same mix proportioning of concrete and different volume fractions of steel
fiber (0.5 % and 0.75%) were prepared. Then, by determining the flexural strength and
deflection of samples, it was concluded that the optimum volume fraction was 0.50 %
(0.44 kg). In the next step,the flexural behavior and deflection of RC beams with the
addition of steel fibers in concrete was considered. The study was conducted on two
types of beam which is beam with 5 links and no steel fibers as a contol beam and the
other one was beam with 4 links and 0.50% and 0.75% volume of steel fibers. The
overall dimensions of the beams were 150 mm in height, 150 mm in width, and 500 mm
in length. The beams were tested under four-point loading test. The results showed that
addition of steel fibers in concrete increases the crackingload, load, stiffness and
ductility of the concrete beams. Furthermore, the addition of steel fibers has more effect
on the properties of RC beams. | en_US |
