VIBROPRESSED FINE-GRAINED ULTRA-HARD CONCRETE USING NEW GENERATION MINERAL MIXTURES BASED ON RECYCLED ASH SLAG DUMPS OF THERMAL POWER PLANTS OF UKRAINE

Mass production of fine-grained ultra-hard concrete for modern blockmaking machines (production of Germany, USA, Turkey) is closely related to the need to use Portland cements CEM I and CEM II and the issues of using effective ash-slag mixtures as mineral additives to reduce the consumption of binder in the process of vibropressing construction products.The situation that developed in 2024 with the significant destruction of most of the powerful thermal power plants operating in Ukraine during Russian missile attacks led to the creation of an artificial deficit in the production of dry-selection fly ash and the absence of this valuable material at electricity generation enterprises. Meanwhile, the issue of saving binder in the form of Portland cements CEM I and CEM II in the mass production of concrete products continues to be on the agenda of modern construction industry enterprises. The authors' article is devoted to the study of vibropressed fine-grained concrete based on ultra-hard mixtures, which are actively being introduced in the Western region of Ukraine, where several technological lines with the latest blockmaking machines of imported production are already operating. The problems of using recycled ash and slag heaps, which have accumulated in significant quantities at Ukrainian thermal power plants in recent years, open new prospects in the manufacture of modern vibropressed products based on ultra-hard mixtures with increased performance characteristics with significant savings in the amount of Portland cement used as a binder for building elements. As a result of the publication, the team of authors of the Department of Construction Production introduces the scientific and technical audience to the latest research carried out at the Lviv Polytechnic in this area, which presents certain results of studying the impact on the properties of ultra-hard vibropressed concretes using mineral purified classified mixtures SM 0/40/70 (DSTU 2.7-128:2006 «Active mineral additive») for partial replacement of Portland cements (CEM I and CEM II) produced by «Ivano-Frankivskcement».