Concrete Reinforced by Hybrid Mix of Short Fibers under Bending

Abstract

In the present study, the mechanical behavior of Fiber-Reinforced Concrete (FRC) beams was studied under bending until rupture. Each beam was reinforced with a hybrid mix of short fibers randomly distributed in its volume. Concrete beams with three different fiber combinations were investigated, namely, beams reinforced with (1) a homogeneously distributed mix of short polypropylene fibers (PP) and steel fibers, (2) PP fibers and Alkali Resistant Glass (ARG) fibers, and (3) PP and composite fibers (CF). The amount of short PP fibers was the same in all FRCs. The investigation focused on the fracture mechanisms and the load-bearing capacity of FRC beams with the developing macro cracks. In total, 12 FRC composite prismatic specimens were casted and tested in four-point bending experiments (4PBT). The current load value versus the Crack Mouth Opening Displacement (CMOD) for all FRCs was analyzed. The crack opening relationship and the influence of fibers on the fracture energy and flexural tensile strength were determined. Rupture surfaces of all samples were investigated using an optical microscope.

The Mechanical Properties of Nanocomposites Reinforced with PA6 Electrospun Nanofibers

“…Epoxy resins are often used as matrix materials in composites because of their adhesiveness, chemical resistance, electrical insulation, light weight, and strong bonding qualities [ 3 ]. The addition of micro- or nanofillers to polymer materials has been used to achieve the desired mechanical and thermal characteristics [ 4 , 5 , 6 , 7 , 8 ]. Nanofiber-reinforced composite laminates can have a higher tensile strength [ 9 ], interlaminar fracture toughness [ 10 , 11 ], resistance to delamination [ 12 , 13 ] under static, impact, and fatigue loads.…”

Morphology and mechanical properties of PAN nanofiber mat

“…Electrospinning is currently generally acknowledged as one of the most effective industrial nanofiber production technologies [13]. Fibre-reinforced composites are used in a variety of industries: e.g., medicine antibacterial characteristics [14,15], reinforced polymer composites [16][17][18], civil engineering construction [19][20][21][22]. Electro spun nanofibers offer a broad variety of applications due to their multiple advantages, including oil/water separation, air filtration, tissue engineering scaffolding, drug delivery [23], sensors [24], composites for load bearing [25][26][27] and advance structures [28,29].…”

Compressive and flexural behavior of glass fiber-reinforced concrete

“…Hybrid reinforcement and reinforcement of different sizes and levels are increasingly used, for example, in modern composite materials and concretes, ranging from nanoscale reinforcement [8][9][10][11][12] to macroscale reinforcement [13][14][15]. Fiber reinforced concrete (FRC) [16][17][18] is developed by adding reinforcement to the concrete in form of fibers with different materials [19][20][21][22] and forms [23,24]. Short fibers can easily penetrate into concrete while mixing and these are added as a reinforcement so that the fibers will distribute throughout the concrete [25,26] and increases its load bearing capacity.…”