Experimental study of the tensile and flexural mechanical properties of directionally distributed steel fibre-reinforced concrete

Abstract

Directionally distributed steel fibre-reinforced concrete has been proposed as a novel concrete because of its high tensile strength and crack resistance in specific directions. Based on the existing studies of the effect of the fibre direction on the mechanical properties of fibre-reinforced concrete, the authors in this paper performed further studies of the mechanical properties of directionally distributed steel fibre-reinforced concrete by conducting split tensile and bending tests. The split tensile strength of the directionally distributed fibre-reinforced concrete clearly exhibited anisotropy. The split tensile strength perpendicular to the fibre direction was much higher than that parallel to the fibre direction. The split tensile strength perpendicular to the fibre direction was almost twice the tensile strength of plain concrete. The flexural performance of directionally distributed fibre-reinforced concrete in the fibre direction significantly improved compared to that of randomly distributed fibre-reinforced concrete. Specifically, the flexural strength increased by as much as 97%. Gravity resulted in a deviation in the tensile properties of concrete prepared by manually and directionally placing fibres in a layered casting process. The test results can be utilised in subsequent concrete designs. The conclusions reached in this paper provide comprehensive mechanical design parameters for the application of directionally distributed fibre-reinforced concrete.

Investigation on the influence of fiber fraction and orientation on the mechanical properties of fiber‐reinforced concrete slabs

“…3,4 However, because the presence of fibers in the cracked surface determines the residual strength of fiber-reinforced concrete (FRC), the post-crack parameters also depend on the placement of the fibers. [5][6][7] Such placement is impacted by the size and fiber typology and the entire production cycle. That is to say, the dosage, kind, distribution, and orientation of the fibers and their orientation significantly impact the residual load-bearing ability.…”

“…Such enhanced qualities can make substantial structural contributions to residual load‐bearing capacities 3,4 . However, because the presence of fibers in the cracked surface determines the residual strength of fiber‐reinforced concrete (FRC), the post‐crack parameters also depend on the placement of the fibers 5–7 . Such placement is impacted by the size and fiber typology and the entire production cycle.…”

Topology and fibre orientation simultaneous optimisation: A design methodology for fibre-reinforced composite components

“…The primary objective of FRCs is to obtain materials with high specific strength and high specific elastic modulus, which means high strength and stiffness with respect to weight. 1,2 Therefore, they are widely employed for the production of structural lightweight components in several sectors such as automotive, aerospace and offshore extraction. 3 FRC laminates are currently manufactured with different production processes, like roll wrapping, spray-up or compression moulding.…”