Review article

This article examines the influence of steel wirefibers on the strength properties of fine-grained concreteexposed to high temperatures of 200, 400, and 600 °C. Thenature and characteristics of the destruction processesof steel fiber-reinforced concrete after being subjected tohigh-temperature heating are studied. Based on the dataobtained, it is concluded that heating concrete and fiber-reinforced concrete samples to 200 °C leads to an increasein compressive and flexural strength, which is due to theactivation of hydration processes, leading to an increasein the adhesion strength in the contact zone of the steelfiber with the matrix. With certain fiber consumption,it is possible to ensure high material strength even attemperature of 400 °C. At temperatures close to 600 °C,chemically bound water is removed and the adhesion ofthe steel fiber to the cement stone is disrupted, which leadsto a significant decrease in the strength of fiber-reinforced concrete as a whole.