The solution of the problems of reducing cement capacity and ensuring the implementation of sustainable development objectives in the production of building materials requires the development of new materials with high performance properties and high efficiency. The proposed work presents an analysis of the results of a study of the combined action of modern plasticizers and carbon filler isolated during enrichment from ash and slag. Ash and slag are formed during the combustion of brown coal. They are a product of hydraulic removal of waste from thermal power plants. According to their chemical composition, they are classified as acidic mixtures of ash and slag. By enrichment, individual substances were isolated from them in the form of dry powders - aluminosilicate, carbon and magnetite. Multi-stage enrichment of the ash and slag mixture made it possible to obtain individual components of a fairly uniform chemical composition and high dispersion. In this work, the carbon component from a mixture of slag and ash from thermal power plants was studied. It was used as a filler in gypsum mixtures. The filler required an increase in water content to ensure the required plasticity of the gypsum mixture. Plasticizers were used to reduce the water content in gypsum-filler mixtures. New-generation hyperplasticizers based on polycarboxylates and their combined effect with a carbon additive on the water-reducing capacity, setting time, and properties of hardened modified stone were studied. Comparative experiments were conducted using various gypsum binders. It was shown that the nature of the technogenic filler enhances the effect of plasticizers. The data obtained can be used in the development of gypsum composite materials for green construction.