Muthanna Journal of Engineering and Technology
Volume (11), Issue (2), Year (30 December 2023), Pages (62-76)
DOI:10.52113/3/eng/mjet/2023-11-02/62-76
Research Article By:
Hanadi F. Frhaan and Aqeel H. Chkheiwer
Corresponding author E-mail: hanadi2297@gmail.com
ABSTRACT
This research focuses on the investigation of corbels constructed using slurry-infiltrated fiber concrete (SIFCON). A total of twelve SIFCON corbels were fabricated in a controlled laboratory setting, with each corbel varying in certain parameters. These parameters include the volume fraction of steel fibers, which were set at three different ratios of 5, 6, and 7%. Additionally, the study examined the influence of the shear span to effective depth ratio, with values of 0.4, 0.5, and 0.6 being considered. Furthermore, the impact of a combination of micro and hook fibers, as well as the effect of reinforcement steel bars, were also investigated. The variables have affected on the mechanical properties of concrete, including the percentage of fiber, as by increasing the percentages, notice an improvement in the performance of the concrete, ultimate load, and cracking loads, also a reduction in deflection. The augmentation of steel fiber content from 5 to 7% resulted in notable enhancements in splitting tensile strength and flexural strength, with increases of approximately 32 and 22.4% respectively. Additionally, the compressive strength and modulus of elasticity shown improvements of approximately 11.3 and 12% respectively, where the effect of the shear ratio on the models was negative, as this effect appeared on the ultimate load, and on the crack load. The crack modes exhibited a flexural tension. These cracks initiated at the junction lines between the corbel and the column, or in its vicinity, and subsequently spread along the face of the column.
Keywords: High strength, Ultimate load, corbels, SIFCON, Steel Fiber, cracking Load, shear span and effective depth.