Characteristics of Vibrations of Viscous Concrete Medium in a Vibroform With Cylindrical Punches

Abstract

The relevance of using volumetric vibroforming machines in the production of reinforced concrete products is considered. A step-by-step vibration effect created by the cylindrical surface of a punch fixed to the vibration form of a continuous formless forming machine is described. The expediency of achieving effective compaction by changing the vibration velocity is proved. The spread of vibration by a punch immersed in a viscous concrete medium is described. Analytical expressions describing changes in amplitude and phase variations of vibration propagation velocity in viscous concrete medium are obtained. Using the obtained analytical expressions, the corresponding graphical dependencies characterizing the impact on the concrete medium vibroform with punches, consisting of two parts that oscillate with different amplitude and frequency characteristics are constructed. The influence of the radial size r of cylindrical punch surface, frequency and amplitude of its oscillations on the change of amplitude and phase shift of vibration propagation velocity is established.