Structural Behaviour of Steel-Fibre-Reinforced Lightweight Concrete

Effect of Using Glass Fiber Reinforced Polymer (GFRP) and Deformed Steel Bars on the Bonding Behavior of Lightweight Foamed Concrete

“…However, prediction of bond strength is dependent on several factors such as bar diameter (∅), concrete cover (c), compressive strength f c , w/c ratio, density, etc. [49]. Additionally, from the present experimental findings, it has become evident that the bond behavior for shorter bonded lengths (3∅ and 4∅) was different from the bond behavior for the largest bonded length (5∅).…”

“…Moreover, the use of the superplasticizer enhanced the bond strength of foamed concrete by reducing the w/c ratio. This increases the ability of FC to resist the crushing caused by ribs at the bond interface and impair the bonding area through its effect on bleeding under the reinforcing bar [49]. Additionally, it must be noted that unlike the FC, NWC specimens have shown a sudden shattering and splitting due to the compressive load applied in an opposite direction to the pull-out load on the machine.…”

“…Further, a reduction in crack width of FC specimens attracts the interest of building codes that always strive to achieve the same: an increase in the durability of the structure, and restricted corrosion of the reinforcing bars as a result of environmental conditions [51]. The bond strength of most of the FC specimens was observed to be greater than NWC specimens, which may be credited to the presence of hooked-end steel fibers [49]. In addition, the use of hybrid fibers increases the ductility of foamed concrete by increasing the confinement and preventing the expansion of the micro-and macro-cracks.…”

“…Moreover, most researchers agree that the main parameters that affect the concretereinforcing bar bonding strength are the bonded length (l b ), the diameter of the bar (∅) and the concrete cover (c), while the other parameters such as density, compressive strength and w/c ratio were found to be less significant [49].…”