The analysis of the presented data indicates that the use of fibers can significantly increase the tensile strength of composite materials containing cementitious binders. Currently, there are several types of fiber-reinforced concretes, such as natural fiber reinforced concrete (NFRC), steel fiberreinforced concrete (SFRC), glass fiber-reinforced concrete (GFRC), synthetic fiber-reinforced concrete (RFRС), carbon fiber-reinforced concrete (СFRС), and combined fiber-reinforced concrete (MSRС). Polymer fibers have a low modulus of elasticity, limiting their applicability for reinforcing structural materials under tensile and flexural loads. The use of steel fibers in dispersed reinforcement complicates the technology due to the formation of clumps during the homogenization of the concrete mix. In practice, the amount of reinforcement (fiber) should not exceed 5 %, limiting the use of steel fibers in fiber-reinforced concrete. Glass fiber, which has a modulus of elasticity close to steel, becomes a promising material for creating fiber-reinforced concrete because the flexibility of glass fibers allows for a greater amount of reinforcement to be introduced and successfully homogenized in the mixture. However, the instability of glass fiber in an alkaline environment requires the development of technical solutions to limit contact with the cementitious binder and ensure its durability. Theoretical justification and experimental confirmation have shown the possibility of obtaining high-strength concrete with increased impact viscosity. It has been established that complex modification of the cement matrix structure and dispersed reinforcement with low-modulus fibers leads to an increase in fracture viscosity, increased resistance to crack formation, and impact dynamic effects (impact viscosity of 75–80 J / cm³). An analysis of the main fibers used in obtaining building materials as a micro-reinforcing component is presented. A comparative analysis of fibers based on a combination of indicators is performed.