Experimental Study and Modelling on the Structural Response of Fiber Reinforced Concrete Beams

Abstract

In many structural applications, concretes reinforced with short metal or synthetic fibers (fiber-reinforced concrete (FRC)) have a number of advantages over traditional concretes reinforced with steel rebars reinforcement, such as easier and more economical production, wear resistance, impact resistance, integrity, etc. In the present study, several concrete mixes were developed and prismatic FRC specimens were fabricated. Their structural behaviors were studied using bending tests until prisms were fractured. Two types of fibers, namely, steel and polypropylene (PP) and three different concrete matrixes were investigated, testing in total 12 FRC prismatic specimens. Every group of FRC had the same concrete matrix, but different internal fiber architecture. All specimens were tested by Four-Point Bending (4PBT). The analysis was carried out with a goal to determine the workability and flexural tensile strength of all FRC groups, comparing these parameters with fracture modelling results. Single crack formation and opening model were established. Crack is crossing whole stretched part of the prism’s orthogonal crossection. Crack is opening, fibers are bridging the crack and are pulling out. Load bearing curves in the model were compared with experimentally obtained.

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.…”

Compressive and flexural behavior of glass fiber-reinforced concrete

“…Concrete mixing is done as per design mix. The mix must have a proper and uniform distribution of the short fibres in concrete mix [37] and should be homogeneous to prevent failures like segregation or balling of the fibres during mixing [38]. Fresh concrete fails if the mix is not homogenous and bleeding occurs [39].…”

Bitumen Stabilised Open Graded Base Materials

“…In the final sieve pan, less than 1% of particles were present, and the grading curve fit nicely within the maximum density envelope. Deviation from the maximum density curve's upper limit was deemed inconsequential [23,24]. However, the focus of this study was on batches of fines smaller than 2.0mm and 1.18mm.…”