The pull-out behaviour of straight, hooked-end and twisted steel fibres have been investigated by many researchers.
Compared to plain concrete, the ultimate flexural strengths of specimens are maximally improved by 74.29%, 165.07% and 112.65% for straight, hooked-end and corrugated fibers, respectively.
Three types of steel fibers, i.e., straight, hooked-end and corrugated fiber, four volume fractions of 0.5%, 1.0%, 1.5% and 2.0%, three corrugated fiber aspect ratios of 40, 60 and 80, were respectively selected.
These cacti are either straight or hooked.
Two different steel fibers, i.e., straight and hooked steel fibers, and three different matrix strengths were adopted.
Straight and hooked fiber pullout tests were performed to evaluate the pullout mechanism, based on which slip-hardening, matrix spalling and tunnel damage assumptions are made.
The aim of the present work is to investigate the flexural behavior of self-compacting concrete reinforced with straight and hooked end steel fibers at levels of 0.5%, 1.0%and1.5%5% and compare it to normally vibrated concrete (NVC).
The experimental variables are fiber type (straight smooth, hooked and twisted), embedment inclination, which varies from zero (aligned with load) to 45°, and loading rate, which ranges from 0.018 mm/s (representing quasi-static loading) to 1800 mm/s (representing impact loading).
As time passed, Anning's confidence in her knowledge grew, and in 1839 she wrote to the Magazine of Natural History to question the claim made in an article, that a recently discovered fossil of the prehistoric shark Hybodus represented a new genus, as an error since she had discovered the existence of fossil sharks with both straight and hooked teeth many years ago.
