Optimisation of composition and strength properties of slag-alkali binders based on fuel slags

Abstract

The study addresses ways to improve the composition and strength of slag-alkali binders derived from fuel combustion products. For this purpose, X-ray diffraction analysis, spectroscopy, microscopy, compression strength tests, and data analysis were used to activate the ash from the power plant units, evaluate the activity of the compositions, heat and moisture treatment, and determine the optimal compositions. Alumina binders have advantages over Portland cement: they are highly durable, waterproof, frost-resistant and corrosion-resistant. These materials are used in the construction of special-purpose facilities, such as motorways, airfields, bridges, transport tunnels and hydraulic structures. As part of an experimental study, optimal ash binders based on fuel slag with the required properties were developed. Analysis of the chemical composition of fuel slags revealed a high content of silicon, aluminium, iron, calcium and magnesium oxides, which makes them suitable for use as binders. Experimental data has shown that the introduction of additives such as gypsum significantly improves the mechanical properties and durability of materials. The developed technological processes of mixing, moulding and curing ensure stable product quality. Tests of the samples demonstrated high compressive, tensile and flexural strengths, confirming their suitability for construction applications. The environmental assessment showed that the use of fuel slag reduces the carbon footprint and reduces the negative impact on the environment. As a result, a scalable production process has been developed that can be implemented in industry to create environmentally sustainable and highly efficient building materials. This study presents new data on the development of environmentally sustainable building materials based on fuel slag, which can reduce environmental impact and improve the sustainability of infrastructure