Abstract
The paper presents the development of a dry flame-retardant construction mixture based on alumina binder using complex mineral and modifying additives. The purpose of the study was to improve the physico-mechanical, thermophysical and flame-retardant characteristics of plaster compositions. It has been established that the introduction of fiberglass, low-melting clay, cellulose esters and bauxite sludge provides a synergistic effect that promotes the formation of a dense and heat-resistant material structure. As a result of optimizing the composition, the strength was increased by 25-30%, the density was reduced to 1100 kg/ m³, and the water absorption was reduced by 30-35%. The material retains its integrity when exposed to a temperature of 900°C for more than 40 minutes, which significantly increases its fire resistance. The practical significance of the work lies in the possibility of using the developed mixture for fire protection of building structures using affordable local raw materials and reduced production costs