Acoustic-Emission Criterion for Optimizing the Quantity of Fibers in the Concrete Matrix

The influence of the volume fraction of high-strength fiber on the mechanical characteristics and acoustic emission (AE) of reinforced concrete beams during their three-point bending testing was studied. A criterion for AE optimization of the volume fraction of high-strength fiber to ensure the maximum tensile strength of composites based on a concrete matrix is proposed, which is the minimum value of the strength factor – the ratio of the tensile strength of the composite to the stresses of the beginning of the generation of AE signals accompanying shear fracture mechanisms. Numerical values of this coefficient were established for fiber concrete with basalt and steel fibers.