Influence of fiber type and matrix composition on adhesive strength in fiber reinforced concrete

Abstract

Introduction. The purpose of the article is to determine the influence of the steel fiber profile and the composition of the matrix on their adhesion in dispersed reinforced concrete.Materials and methods. Studies have been carried out using the test methods set out in national standards. To determine the characteristics of the adhesion strength of fibers with a matrix, an original technique developed at SPbGASU was used.Results. The degree of influence of the geometric shape of steel fibers – anchor and wave profile on the adhesion strength characteristic is determined. The adhesion strength of steel fiber with cement and concrete matrix was assessed (Cement: Sand = 1:1, Cement: Sand = 1:2 and Cement: Sand = 1:3). The influence of the volume fraction of the cement paste on the characteristic of the adhesion strength of the steel fiber with the matrix has been experimentally proven.Conclusions. The experimental data obtained confirm the effectiveness of dispersed reinforcement through the use of anchor fibers in combination with a rationally selected composition of the concrete matrix.

Strength Properties of Various Types of Fiber-Reinforced Concrete for Production of Driven Piles

“…For instance, the compressive strength of fiber concrete is 20-50% higher, the modulus of elasticity is 30-40% higher, and the water permeability is 50% higher than conventional concrete. In addition, the high cracking resistance and significant resistance to impact loads positively characterize fiber-reinforced concrete [3][4][5][6].…”

“…Fibers in the composition of fiber-reinforced concrete are the steel elements (sections of wire, rope, cuts from steel sheet, elements in the form of steel needles, threads, etc.) [1,[3][4][5][6][7], glass fibers [2,4,8,9], basalt fibers [9][10][11][12][13], carbon fibers [9,13], polymer elements (polypropylene fibers, capron threads, cellulose threads) [9,13,14] and other used methods.…”