Ведмідь, В.В.

This article presents a comprehensive study of the compaction process of polystyrene concrete mixtures subjected to vertical harmonic vibrations generated by a laboratory-scale vibration platform. Polystyrene concrete, a type of lightweight concrete incorporating expanded polystyrene beads (3–6 mm in diameter) as filler material with a volumetric content of up to 60%, exhibits significantly different mechanical and dynamic behavior compared to conventional heavy concrete. These differences include lower density, higher internal friction, and increased damping capacity, which greatly affect the efficiency and uniformity of vibration-induced compaction. A mathematical model of the “vibration platform – concrete medium” system was developed, considering the mixture as a continuous viscoelastic medium with distributed parameters. The model integrates the effects of internal damping, effective density, elastic modulus, and boundary conditions under vertical oscillations. Numerical simulations were performed alongside physical experiments using a vibration platform with variable excitation parameters and concrete layer heights ranging from 50 to 200 mm. Experimental results demonstrated that vibration amplitudes decrease significantly with height due to wave attenuation, particularly in mixtures with high damping properties. This non-uniform energy distribution leads to insufficient compaction in upper layers if the excitation parameters are not optimized. The study highlights the importance of adjusting vibration modes based on the specific physical properties of the polystyrene concrete, including the use of layer-by-layer compaction or increased excitation force for taller forms. The findings of this research contribute to improving the technological process of manufacturing lightweight concrete products and provide a basis for designing more efficient vibration systems tailored to polymer-filled concrete materials. Additionally, the obtained theoretical and experimental results can be applied to enhance structural performance, reduce material consumption, and increase the homogeneity of prefabricated elements, particularly in sustainable construction practices where weight reduction and thermal insulation are critical performance indicators

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