Bending Strength of Fiberconcrete with Nanoparticles, Having Polymer Fibers

Polymer fibers were used in structural applications as micro reinforcement in composite materials having concrete matrix. Comparing to steel, glass and carbon fibers, polymer fibers behave visco-elastically or visco-elasto-plastically. Such fibers having moderate elastic modulus are characterized by relatively large elastic deformations and pronounced Poisson’s effect during stretching. Concrete prisms with dimensions 10x10x40 cm were fabricated, having different amounts of 3 cm long and 0.75 mm in diameter polymer fibers. All prisms were tested under four point bending conditions. Elaborated numerical model for crack opening in fiberconcrete was exploited for prism load –deflection mechanical behavior prediction under four point bending conditions. Experimental pull-out results were successfully used as an input data for the model

Bending Strength of Fiberconcrete with Nanoparticles, Having Polymer Fibers

Polymer fibers were used in structural applications as micro reinforcement in composite materials having concrete matrix. Comparing to steel, glass and carbon fibers, polymer fibers behave visco-elastically or visco-elasto-plastically. Such fibers having moderate elastic modulus are characterized by relatively large elastic deformations and pronounced Poisson’s effect during stretching. Concrete prisms with dimensions 10x10x40 cm were fabricated, having different amounts of 3 cm long and 0.75 mm in diameter polymer fibers. All prisms were tested under four point bending conditions. Elaborated numerical model for crack opening in fiberconcrete was exploited for prism load –deflection mechanical behavior prediction under four point bending conditions. Experimental pull-out results were successfully used as an input data for the model.

Mechanical Properties of Flax Fiber Based Polymer (with Nano Additives) Matrix Composites

This study has been conducted in order to examine and investigate the use of a natural material. While synthetic fibers are limited with regard to resources needed for their production, natural fibers are always renewable and degradable, and their required life-time and strength are comparable with those of synthetic fibers. In the present study, the application fields of natural fibers, technical properties of natural fibers, types of natural fibers, fiber treatment methods, chemical structures of natural fibers, natural fiber compatible matrix materials, limitations and renewability of natural fibers are analysed. Flax fiber polymer matrix (with nano additives) composites were fabricated using fibers with treated and untreated surface. Composite coupons were tested by tension till failure. Mechanical behaviour of materials with treated and untreated fibers were compared and analysed.

Numerical 3D Investigation of Non-Metallic (Glass, Carbon) Fiber Pull-out Micromechanics (in Concrete Matrix)

In the paper short glass and carbon fiber micro-mechanics in concrete matrix is under consideration. In present work was performed pull-out 3D numerical modeling. Numerical results were compared with realized experiments for single and few (fibre bundle) AR glass and carbon fibers pulling out of concrete matrix. Investigated were one fiber pull-out dynamics as well micro-stresses in the material. During performed single fiber pull out experiments were established such process mains steps: a) fiber and matrix elastic deformation with perfect bond between fiber and matrix; b) cylindrical delamination crack growth in material between fiber and concrete matrix; c) fiber break in concrete, after what free fiber end with friction is pulling out of matrix. Numerical model based on FEM were elaborated for all three failure steps. Numerical simulations were established mechanical background for such failure phenomena. Were established main load bearing and failure mechanism for short glass and carbon fiber concrete composites – single fiber pull out with simultaneous fiber failure

Effect of Steel Fibre Content on Bending and Compression Behaviour of Fibre Reinforced Concrete

Steel fibre reinforced concrete (SFRC) as modern perspective building material is increasingly used in diverse civil engineering applications. In SFRG mox fibres traditionally are the most expensive component, so its rational use is an actual task of SFRC mix design. In present investiganion different types of commercially available fibers, having different geometry, were used for SFRC samples preparation