Abstract
•Effect of polymineral binders on structure of concrete is revealed.•Increase in compressive and flexural strength of polymineral binders is established.•Good properties of concrete are due to improved structure of hardened binder.•Expanding the raw material base of polymineral binders.
The use of composite binders instead of cement with the use of highly effective types of mineral raw materials, which has gone through the path of multi-stage natural activation due to deep geological processes, is a promising direction of modern construction materials science. The paper is devoted to the development of a resource-saving technology for obtaining high-strength composite binders for energy-efficient construction. The significance of this study is to focus on expanding the raw material base of polymineral binders at the expense of technogenic and substandard materials. The work is aimed at studying the nature of the joint interaction of alumina, silicate and carbonate components from natural and technogenic raw materials, taking into account its genesis in the processes of structure formation of multicomponent hardening systems. The novelty of the work lies in the establishment of regularities for the regulation of the structure and properties of the composite binders with powdered mineral modifiers. Comprehensive researches of natural raw materials included the study of its energy performance and particle sizes parameters after grinding. The synthesized polymineral binders were compared in terms of heat of hydration, rheological and physical–mechanical properties, as well as their microstructure. The developed modified cementitious pastes have a water-binding ratio of no more than 0.3; compressive strength of 81 MPa, flexural strength of 12 MPa. Accordingly, the cement composites have great potential for use in civil engineering.