Synergistic effect of binary filler systems on the microstructural stability and dynamic strength of high-performance cement binders

This study presents a comprehensive theoretical and experimental investigation into the synergistic interactions of binary mineral fillers (active microsilica and limestone) and their influence on the structural stability and mechanical performance of CEM I 42.5N binders. Grounded in V. I. Salamatov’s surface activity theory, the research establishes a novel quantitative relationship between particle dispersity and the formation of high-density interfacial transition zones. By systematically varying mass fractions (0-20 %), we identified a non-linear synergistic effect that significantly enhances the material's damping potential – a critical factor for infrastructure subject to cyclic loads. Experimental data, validated through statistical analysis, confirm that optimal binary compositions yield a dense microstructure with compressive strength reaching 71.5±1.5 MPa, representing a 24 % increase over the control. Furthermore, the study introduces a mathematical framework to predict strength kinetics as a function of filler surface activity ( F m ). This dual-mechanism approach (hydration intensification vs. micro-structural densification) provides a resource-efficient strategy for designing vibration-resistant composites in digitalized construction frameworks.