The number of researches on steel fiber reinforced concrete (SFRC) fire resistance is insignificant. For the calculation of building structures for fire resistance, it is necessary to use the thermophysical characteristics of concrete: thermal conductivity, heat capacity and thermal diffusivity. The physicomechanical characteristics of SFRC depend on the volumetric content of the fiber in it. This paper presents the results of studies of thermophysical properties of SFRC. The studied SFRC had a high-strength self-compacting cement-sand matrix and a different percentage of fiber content (from 0 to 6%). The experiments were carried out for SFRC with steel wavy fiber 15 mm long and 0.3 mm in diameter. As a result of experimental studies, it was discovered that with an increase in the volumetric content of the fiber, a decrease in the values of heat flow, thermal conductivity and thermal diffusivity coefficients, specific heat capacity is observed and the thermal resistance of SFRC increases.
The paper considers the effects of high temperatures in case of fire on the change in impermeability of steel fiber reinforced concrete having a high-strength cement-sand matrix and various content of fiber of different types, sizes, and strength. It is shown that in the temperature range from 20° to 1100° C in the diagram “Heating temperature - impermeability class», the matrix and steel fiber concrete(SFC) have a S-shaped character, and in case of heating temperature of over 100 °C, there comes a distinct decrease in impermeability.
The paper considers the results of the impact of high temperatures during the fire on changes in the density and elasticity modulus of steel fiber reinforced concrete (SFRC) at different values of density of the cement-sand matrix corresponding to its flexural strength of 5.0 and 8.5 MPa. It is shown that in the temperature range from 20 to 1100 °C, the diagrams «Density of steel fiber reinforced concrete - heating temperature» are linear and their shape does not depend on the type of fiber and its content in steel fiber reinforced concrete. The results of the performed studies allow determining the change in the elastic modulus of the SFRC after heating.
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