ВІДВАЛЬНІ ДОМЕННІ ШЛАКИ ЯК РЕСУРС ВИРОБНИЦТВА ШЛАКОЛУЖНИХ В'ЯЖУЧИХ.

The relevance of the work is related to the solution of environmental problems while reducing the use of natural resources and the search for ways to create alternative binders with specific properties. The aim of the work was to solve the problem of resource saving by justifying of waste blast-furnace slags as slag-alkali binders (SAB). Waste blast-furnace slags of PJSC Dneprovskiy Metallurgical Plant, Zaporizhstal, Mariupol Metallurgical Plant, Alchevsk Iron and Steel Works and waste and granulated blast-furnace slag of ArcelorMittal Kryvyi Rig were studied. The slags were dispersed to a specific surface area of 2700-4950 cm²/g. For mixing, water and 20 % NaOH solution were used. The strength of the SAB samples was determined on a P-5 press. The mineralogical composition of the SAB was determined by X-ray phase analysis. Slag fractions were selected that meet the criteria for practical utilization: the ratio of oxides of the main elements, compliance with the requirements of the modular classification and the values of the quality and saturation coefficients. The interaction of slag minerals with mixing agents is confirmed by a change in the mineralogical composition of the SAB compared to the initial composition of slags. New formations are represented by Ca and Mg aluminosilicates, carbonate compounds and sodium-containing phases, which are the products of hydration hardening. The different nature of the SAB hardening products indicates the simultaneous implementation of the contact-condensation and hydration mechanisms of the process. In terms of mineralogical composition, SABs based on waste blast-furnace slags occupy an intermediate position between clinker cements and SABs based on granulated blast-furnace slags. Special properties of SAB are predicted: the duration of strength increase in time; compaction and strengthening of the structure as a result of the formation of carbonate phases; resistance to sulfate corrosion; heat resistance. [ABSTRACT FROM AUTHOR]