Встановлення теплофізичних характеристик теплоізоляційного шару штукатурки при вогнезахисті бетону

The object of research was the change in the properties of concrete under the influence of flame and its protection when applying heat-insulating plaster capable of inhibiting the temperature under the influence of flame. It was established that in the process of thermal action on the plaster, the process of thermal insulation of concrete consists in the application of materials with low thermal conductivity on the surface of the material. Thus, under the influence of the burner flame, a temperature of over 800°С was created on the surface of the sample for 1800 s, but the temperature on the surface of the concrete under the layer of plaster did not exceed 120°С, which indicates the formation of a barrier for heat transfer. In this regard, experimental studies were conducted and it was established that the presence of aluminosilicate microspheres in the plaster leads to the formation of a heat-shielding layer on the surface of concrete resistant to mechanical vibrations. According to experimental data, the coefficient of thermal conductivity and thermal conductivity of the plaster was calculated, which is 6.22·10–7 m2/s and 0.142 W/(m∙K), respectively, due to the addition of aluminosilicate microspheres. Thus, there are reasons to assert the possibility of targeted regulation of the fire protection processes of concrete through the use of heat-insulating plaster capable of forming a protective layer on the surface of the material, which inhibits the speed of heat transfer