POSSIBILITIES OF USING INDUSTRIAL WASTE TO IMPROVE HEAT RESISTANT CONCRETE DURABILITY AND REFRACTORINESS

The article analyzes recycling of industrial waste. The main direction of construction production development is the use of new materials, reduction of material intensity, providing mechanization and industrialization of construction, increasing the operational characteristics of products and structures, the implementation of wasteless technologies in building materials at the expense of industrial waste and pollution reduction. It is important to produce concretes and mortars with enhanced physical and thermal properties for linings of thermal units operating in difficult operating conditions (high temperature, aggressive environment, contact of lining material with gases, metal melts and fluxes). Heat-resistant concretes are used in ferrous and non-ferrous metallurgy, chemical and oil refining, petrochemical, power, machine building, pulp and paper industry, in building materials The introduction of heat-resistant concrete by using new structural elements for thermal units, the most appropriate from the thermal and technological side, which is not feasible when using piece ceramic refractories. Components of heat-resistant concretes - fine grind additives and aggregates are usually made of expensive materials (chamotte, mullite, chromite, magnesite, zircon, etc.). The production of additives requires energy-intensive milling and sieving operations, which complicate and increase the cost of aggregate production technology. The replacement of scarce and expensive components by local materials and the development of technology for obtaining heat-resistant concrete on chemical binders using non-deficient materials, especially industrial waste is an important task. The prospects of using alumina-containing wastes as additives in heat-resistant concretes, which allows increasing durability and refractoriness of construction materials. The used fine-dispersed catalyst IM-2201, which is used in petrochemistry and is an alumina-chromium waste, was studied. The composition and properties of this waste and the change in the properties of concrete with the introduction of additives have been studied. It was shown that the properties of concrete change after the introduction of alumina-chromium waste in a given amount (5, 10 and 15%). Their average density, thermal strength and other properties are increased. The improvement of physical and thermal characteristics depends on the structure and new formation in the obtained samples. Concrete samples were analyzed using petrographic method and it was shown that the addition of aluminochrome waste contributes to densification of the structure due to filling the pore space with glassy mass and newly formed crystals in the cementitious mass.

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