Movement of particles of concrete mixture aggregate subjected to vibration by cylindrical punches

Abstract

For compaction of the concrete mixture in the manufacture of reinforced concrete products using the formless production method on long stands, as a universal and widespread method, vibration is used. The aim of the study was to establish the regularities of the process of spreading a cylindrical punch of a continuous formless machine of vibration oscillations on the aggregate particles of a viscous concrete mixture in the form of crushed stone and sand. The chaotic movement of filler particles of various sizes with an arbitrary number of degrees of freedom, due to their large number, movement, and exchange of impulses, is considered. The problems of the development of mathematical descriptions of the motion of spherical filler particles of different grain size in the vibration of a cylindrical punch with a viscous environment and determination of their average values of travel speed and distance through random motion were solved, the average values for these parameters at vibration of the punch with frequencies and amplitudes that are applied in industrial conditions were found. In the course of the work, the method of mathematical modeling was used. The result of this work is to establish the possibility, for particles of different sizes, of varying the average values of the speed of movement and the path traversed in a viscous environment, carried out by changing the characteristics of the vibration of the punch. The regularities of changes in the parameters under consideration for filler particles of various sizes depending on the frequency and amplitude of vibration oscillations of the punch surface are considered.