A distinctive feature of dispersed-reinforced concretes is the presence of discrete fibers in their composition, the effect of which on the changes occurring in the structure and properties of the material must be taken into account when assigning the composition of the concrete matrix [17; 18; 19; 20]. The fundamental principle used in the development of private techniques is the concept of fiber as a part of a kind of filler with a developed surface and has a significant impact on the technological characteristics of the mixture of components [21; 22; 23; 24]. Many scientists dealing with dispersed-reinforced concrete agree with the hypothesis that the critical factor that determines the properties of fiber-reinforced concrete is the adhesion strength of dispersed reinforcement to the matrix. However, the characteristics by which the adhesion strength can be judged, as well as the methods for their determination, are offered differently. Thus, in [25], a coefficient of utilization of the strength characteristics of reinforcing fibers \(K_{isp}\) is proposed, which varies from 0 to 1  
\[K_{isp}=\frac{R_{drc}-R_{M}}{k_{x}\cdot\mu_{0}\cdot R_{a}} \tag{1}\]  
where \(R_{drc}\) is the ultimate strength of dispersed-reinforced concrete; \(R_{\rm m}\) is the ultimate strength of the matrix; \(k_{x}\) is the fiber orientation coefficient; \(\mu_{0}\)--the degree of saturation of the concrete matrix with fibers; \(R_{\rm a}\)--ultimate strength of reinforcement. In [13], a method was developed for the characteristic of fibers' adhesion with a cement stone from a normal mortar concentration  
\[\tau=\frac{R_{fc}-3,5*R_{cz}*\mu_{min}-(1-4,5*\mu_{min})*R_{cc}}{2*\frac{l}{d }*\mu_{min}} \tag{2}\]where \(R_{fc}\) is the strength of fiber cement; \(R_{cz}\)--the strength of the contact zone; \(R_{cz}\)--the strength of cement stone from a normal mortar concentration; \(\mu_{min}\) is the minimum reinforcement coefficient. Thus, the problem of designing compositions of fiber-reinforced concrete is reduced to the rational choice of dispersed reinforcement, corresponding to the conditions of its operation and purpose. This means that when formulating a task for the design of fiber-reinforced concrete compositions, it is necessary to specify the following information:  
* The size and type of the product;
* Ultimate tensile strength in bending, ultimate strength in compression, crack resistance, and fracture toughness;
* Concrete workability (rigidity or mobility);
* Frost resistance, abrasion, water resistance, and other characteristics [26; 27; 28; 29]. It is known that dispersed concrete reinforcement with high modulus fibers (steel, carbon, etc.) increases the concrete strength. To the greatest extent, dispersed reinforcement with high-modulus fiber makes it possible to increase the tensile strength of fiber-reinforced concrete in bending. According to known data [30; 31; 32; 33], the tensile strength of concrete with steel fiber reinforcement, the diameter of 0.3 mm, regarding 3% fiber reinforcement by volume, increases five times compared to unreinforced concrete. In [34; 35], the volume fiber reinforcement of concrete is 2%, and the flexural strength increases two times. Using a steel fiber with a larger diameter, it is also possible to achieve higher tensile strength several times. Evaluation of the diffusion coefficient of chloride ions in self-compacting concrete with steel fibers was carried out in [36]. The article presents three procedures for calculating the diffusion coefficient--rapid chloride penetration test, accelerated chloride penetration test, and measurement of surface electrical resistivity using a Wenner probe. The addition of synthetic fibers to the concrete mixture does not lead to a noticeable increase in the strength of the composite for axial tension, elongation in bending, and compression under the action of static loads, since concrete cannot transfer static forces to fibers, which have a lower modulus of elasticity compared to concrete.