Abstract
The value of the thermal conductivity coefficient depending on the temperature of the samples of steel rod fragments with fire-retardant cladding has been determined in the present research. The thermal conductivity coefficient of mineral wool fire-retardant cladding was determined; special patterns of its dependence on temperature were revealed. This is explained by the thermal decomposition with the release of thermal energy of inclusions between the fibers of mineral wool and its fibers at a temperature of 750 °C. The apparent minimum of the thermal conductivity factor for fire-retardant mineral wool cladding with a thickness of more than 50 mm is observed at a temperature of about 100 °C. This happens due to the fact that at this temperature the free moisture contained between the fibers of the mineral wool evaporates. Generalized temperature dependence of the thermal conductivity coefficient of mineral wool fire-retardant cladding has also been derived, in a tabular form. It can be used for calculating the temperature in steel structures with such fire protection. The thickness range for application is up to 80 mm for the specific heat capacity of 1,000 J/(kg °C) and a density of 200 kg/m 3 . It is shown how the obtained dependence can be used for predicting heating in steel structures with fire-retardant mineral wool cladding. The relative error between the calculated and experimental data was calculated. The Cochrane, Student, and Fischer criteria for the results of temperature calculation in steel structures with fire-retardant mineral wool cladding between the calculated and experimental data accept values that do not exceed the tabular quantities. This means that the results of the calculation using the obtained temperature dependence of the thermal conductivity coefficient are adequate
Highlights
Steel structures are widely used in modern construction in various structural forms
This occurs when such a statistical criteria that characterize the scatter of tempera- maximum is absent for samples with a relatively thicker layer ture deviations in the studied samples do not exceed the tab- of mineral wool cladding. The presence of such a maximum ular values. This means that the obtained dependence of the can be explained by the fact that at a certain heating temthermal conductivity coefficient can be used as general for perature of the fire-retardant mineral wool cladding, its inner predicting the heating in steel structures with fire-retardant layers undergo an oxidation reaction
The thermal conductivity coefficient of mineral wool fire-retardant cladding has been determined in this work; patterns of its dependence on temperature have been revealed
Summary
Steel structures are common in quick prefabricated buildings. These are industrial and agricultural facilities (woodworking shops, warehouses of building materials, granaries, poultry farms, greenhouse), garages for special equipment, sports and recreation complexes, exhibition and entertainment centers, shopping pavilions, office buildings, etc. To increase the fire resistance of steel structures, fire protection means are used. The use of fire-retardant cladding remains an effective means of ensuring the designed fire resistance of steel structures. Mineral wool boards are a promising material for fire-retardant cladding because their application provides benefits when performing installation operations, cost-effectiveness, as well as the ability to increase fire resistance without dismantling the main structures. It is a relevant task to study the fire resistance of steel columns with fire-retardant cladding made from the mineral wool coating
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