The use of technogenic carbon in gypsum compositions for green building

Tver State Technical University, Tver, Russia

¹ Corresponding author: tanovi.69@mail.ru

Abstract

The publication is devoted to the study of the possibility of using ash and slag waste from hydraulic removal of fuel power plants in the production of building gypsum materials. These wastes are not used in industrial production due to the heterogeneity of composition and properties. This is a big and unresolved problem for many thermal power plants. However, when separating individual parts - carbon, aluminosilicate or magnetite - the possibility of using the selected part of the component increases. The paper considers the use of carbon and aluminosilicate parts as an additive in the composition of gypsum compositions. A comparative analysis of the properties of gypsum compositions modified with carbon and aluminosilicate additives is given. A higher efficiency of using a carbon additive for lightweight gypsum compositions has been established. The comparison was carried out in terms of compressive strength and average density. Additives were introduced in the amount of up to 30%. The ratio of tensile strength and density for modified mixtures was characterized by specific strength. It was higher for mixtures with a carbon additive. The introduction of porous mineral fillers - perlite and vermiculite - in a volume of up to 20% contributed to an even greater decrease in density. The best result was shown by mixtures with the carbon component of ash and slag mixtures and the addition of perlite. They can be used for green building.