HYDRATION AND STRUCTURE FORMATION OF MULTICOMPONENT MODIFIED BINDERS: MECHANISMS AND PROPERTIES

Abstract

This paper presents the results of studies on hydration and hardening processes of multicomponent modified binders containing active mineral and chemical additives. The aim of the research was to establish the patterns of cement stone structure formation and identify the factors contributing to the improvement of its strength and durability. It is shown that the high strength of the modified binder is due to the formation of stable low-basic calcium hydrosilicates generated through the pozzolanic reaction between portlandite and active amorphous silica included in the complex additives. Mechanochemical activation of the components increases the number of active centers, accelerates hydration and intensifies hardening. X-ray diffraction and thermal analyses confirmed the presence of calcium hydrocarbonaluminates, whose formation enhances sulfate resistance. Electron microscopy revealed a denser microstructure of the cement stone and close intergrowth of portlandite and C–S–H phases, which contributes to the formation of a monolithic, low-porosity structure. The results demonstrate that adjusting the binder composition and curing conditions allows targeted regulation of hydrate morphology and optimization of the phase composition. This ensures the production of high-strength and chemically-resistant concretes under reduced-temperature curing, expanding the application potential of multicomponent binders in modern construction