Investigation of the Effect of Nanoscale Alumina Fiber on the Heat Resistance of Refractory Concrete

The results of studies of the effect of alumina nanofiber on the physical and mechanical characteristics of refractory concrete NPC-21AC are presented. It is shown that the use of nanofibers increases the flexural strength by 50 % and compressive strength by 30% with a 15% decrease in Young’s modulus. An increase in physical and mechanical characteristics leads to a 54 – 72% increase in thermal resistance, depending on the rate of heat transfer. The results of the study of the microstructure of the obtained material are presented.