MODELING OF HIGH-TEMPERATURE HEATING OF STEEL-FIBROBETON

The work is devoted to the problem of physical simulation of high-temperature impact on dispersed-reinforced concrete. The results of experimental studies of the behavior of finegrained fine-grained concretes with metallic fiber (steel fiber-reinforced concrete), in the high-temperature effect modeled in the muffle furnace, are presented. The muffle furnace is selected on the basis of the required high-temperature exposure parameters. In particular, the maximum heating temperature, the rise time of the temperature to the required 8500C. All selected parameters are well correlated with the parameters of real fires. The medium of the working space of the muffle furnace when creating the temperature effect is air. One of the advantages of the selected muffle furnace is the ease of operation and sufficient stability of the maintained temperature. The technique of carrying out the experiment at different hightemperature effects on steel-fiber-reinforced concrete has been worked out. It is shown that the use of dispersed reinforcement in the form of metallic fibers improves the state of experimental samples after high-temperature exposure of a given level. It was revealed that the degree of influence of disperse reinforcement on the state of samples depends on the percentage of reinforcement and the magnitude of the temperature effect. It is shown that an increase in the time of high-temperature exposure affects the state of the samples. The results of the research will help further develop the process of physical simulation of hightemperature heating in the study of the properties of building materials.

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