Study of the Thermophysical Characteristics of Steel Fiber Reinforced Concrete

Abstract

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.

Performance of Fiber-Reinforced Ultra-High-Performance Concrete Incorporated with Microencapsulated Phase Change Materials

“…Theoretically, concrete with a higher percentage of steel fiber results in greater thermal conductivity. However, the addition of steel fibers and fiber ag glomeration will increase the porosity of the concrete, particularly with higher steel fibe content, which significantly reduces thermal conductivity and offsets any increase in th thermal conductivity of the samples [43,[67][68][69][70][71]. The thermal properties of the UHPC wit different steel fiber contents are plotted in Figure 14b, where the MPCM content of th mixture is fixed at 0%.…”