RESEARCH OF CONCRETE MIX THIN LAYERS INTERACTION WITH VIBRATING FORM VERTICAL WALLS
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2017, Vol 1, Issue 103
Abstract
Purpose. Existing methods of definition of rational parameters of vibrating machines do not provide the required accuracy when the thickness of the sealing layer between the vertical walls of less than 50 mm, which is usually ob- served when molding the hollow blocks. Therefore, for justification of rational parameters of the vibrating machine is necessary to accurately determine the pattern of deformation generated environment closely spaced vertical walls of the mold and to set the law of motion of vibrating forms used for the manufacture of hollow building blocks. The aim of this work is to study the interaction of concrete mix with the vertical walls of the mold without a bottom for forming hollow building blocks of the horizontally directed oscillations. Methodology. To determine the resistance forces aris- ing in the process of sealing the mathematical model of the interaction of thin layers of concrete with vertical walls vi- brating shape without a bottom. On the vibrational form is valid horizontally directed force. but the sealing environment is presented in the form of continua with distributed parameters. The equations of oscillations of a dynamical system in partial derivatives and defined boundary conditions. This regularity of the variations of the studied dynamic system. Results. By solving the equation of oscillation of the sealing medium equations, satisfying the given boundary condi- tions, determined the pattern of deformation of a thin layer of the sealing medium depending on the rise time of the den- sity of the moldable mixture, its physical-mechanical characteristics, the thickness of the sealing layer of the vibrating mass shape, frequency and amplitude of the perturbing force. Coefficient of resistance of the concrete mix acting on the vertical wall of the vibration of the bottom depending on the relative density of the concrete mix, its consistency and thickness of the sealing layer. Determined by the oscillation amplitude of vibrating forms and stresses in the sealing environment. Originality. First investigated the interaction of vertical walls vibrating shapes with thin layers of com- pacted concrete. As formulated in the equations of oscillations of a dynamic system takes into account the effect of compressive and tensile forces acting on opposite walls of the form. The found stresses in the concrete mix that occurs throughout the thickness of the sealing layer. Practical value. The theoretical expression that allows to make computer modeling of the laws of motion and mode shapes of thin sealing layers of concrete mixtures, to examine them from the point of view of effective influence on the processed medium horizontally directed vibrations, to justify the shape and form of vibration exposure, and to substantiate the rational parameters of vibrating equipment. The dependences of co- efficient of impedance can be with a fairly high degree of accuracy used in complex discrete dynamical systems, such as vibratory form without a bottom, making the complex oscillations in the form of rectilinear and krutilek oscillations in the horizontal plane and providing a molding hollow concrete blocks.
Authors and Affiliations
A. Maslov, V. Luk'yanenko
Keywords
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