Mechanical properties of concrete with small fibre for numerical modelling

Abstract

The study specializes in the area of mechanical properties of select fibre reinforcement concrete. For the research fibre concrete reinforced with short steel fibres was used without bending. Fibre concrete is produced in the dosing 40 and 75 kg/m3. Laboratory program includes a complete group of tests, i.e. concrete compressive strength in cubes, three-point bending test, and split tension strength perpendicular and parallel to filling direction. Results are processed in summary, and they also include fracture-mechanical parameters needed for structural modelling. The research carried out found the positive influence of fibre on tensile strength and fracture energy. However, with more fibre, only fracture energy increases. It has also been found that the effect on compressive strength is small. For numerical modelling, the suitability of using a 3D computational model in combination with the fracture-plastic material model for fibre reinforcement concrete was verified.

Influence of Microfibers Additive on the Self-healing Performance of Mass Concrete

“…According to experimental methods for examining the physical properties of all concrete mixtures, the dry density increases with an increase of % PPMFs at 7-and 28-days age as shown in Figure 9 [10,15], porosity and water absorption results provided decrease with an increase of %PPMFs [10] Figure 10 and 11.…”

Influence of the Undercut Anchor Head Angle on the Propagation of the Failure Zone of the Rock Medium

“…Steel-reinforced and fiber-reinforced materials have a large share in today’s engineering structures. In numerical modeling of fracture issues, it is then necessary to use a 3D computational model in conjunction with a material model of fracture-plastic (the fracture-plastic material model) [ 7 , 8 , 9 ]. The strength parameters of these materials relevant to numerical modeling include the compressive strength of concrete cubes, the tensile strength of three-point bending test, and the tensile strength of splitting perpendicular and parallel to the direction of fill.…”

Selected Approaches to Numerical Modeling and Analysis of Fiber Reinforced Concrete Beam

“…They differ in the basic matrix -concrete and the fibers used (shape, material) [3]. There are a number of recommendations [3][4][5][6], standards [7] or national standards [8] for the design of fibers reinforced concrete structures, but they mainly focus on the testing and determination of mechanical properties [9][10][11][12][13] for analytical or simplified computational models. However, when using advanced numerical simulations [14], [15] there are a number of possibilities to describe the behavior of fiber reinforced concrete, which cannot be interpreted directly from the recommendations and standards.…”