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Increasing the Homogeneity of Liquid Aerated Concrete Mixtures from Dispersed Brittle Materials by Their Vibromixing in the Manufacture of Building Products

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Abstract

Technical re-equipment in construction industry tends toward the wide use of cellular concrete. The formulation and advantages of these materials were analyzed. The technological difficulties in their manufacture were mentioned. The most difficult problem is to ensure uniformity by quickly mixing the aerated concrete mixtures of components that differ in composition and mass fraction before the start of active gas formation, gas retention, and especially solidification. These difficulties can be eliminated by using the new technique of vibrojet mixing of both Bingham and Newtonian media. Forced high-frequency vibration actually increases the thixotropy of the mixture regardless of the number of components and their mass and physicomechanical properties. At the same time, monitoring the vibration parameters increases the circulation and interaction of the generated submerged jet flows. Rheological models were developed to determine the technical characteristics of the mixer vibrodrive and the process parameters. Supercomputer modeling of various scenarios of vibrojet mixing in the FlowVision program allowed visualization and optimization of modes to completely exclude stagnant zones in the mixer. In a full-scale experiment, test samples were prepared from the aerated concrete mixtures obtained by centrifuging and vibromixing. Their growth and strength characteristics were compared in accordance with GOST (State Standard) 10180-2012. The results showed that the new method for the preparation of mixtures and products from aerated concrete is highly effective.

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Funding

This study was financially supported by the Ministry of Education and Science of the Russian Federation (project no. 9.7960.2017/VR).

NOTATION

С x

coefficient of medium viscosity along the X axis

C y

coefficient of medium viscosity along the Y axis

D b

diameter of bearing in the CV joint, m

E

elasticity modulus of the medium, Pa

f b

friction coefficient in the CV joint

g

gravity factor, m/s2

I

moment of inertia of the system normalized to the vibration generator axis, kg m2

k x

coefficient of medium elasticity along the X axis

k y

coefficient of medium elasticity along the Y axis

M

total mass of the whole vibration system (vibration generator and mixture), kg

M dr

driving torque, N m

M fr

friction moment of rocking of the mobile parts of the vibration generator, N m

m

mass of the rotor plate that generates the radial vibrations of the vibration generator, kg

P el

viscoelastic resistance force of the mixture, N

S

surface area of the perforate disk that interacts with the medium, m2

x

mixture displacement along the X axis, m

\(\dot {x}\)

mixture displacement rate along the X axis, m/s

\(\ddot {x}\)

acceleration of mixture displacement along the X axis, m/s2

y

mixture displacement along the Y axis, m

\(\dot {y}\)

mixture displacement rate along the Y axis, m/s

\(\ddot {y}\)

acceleration of mixture displacement along the Y axis, m/s2

ε

mixture strain, %

\(\dot {\varepsilon }\)

mixture strain rate, s–1

μ

viscosity of the medium, Pa s

ρ

vibration amplitude of the vibration drive, m

σ

stress in a viscoelastic body, Pa

φ

phase shift angle of vibrations, rad

ω

radial vibration frequency of the vibration drive, rad/s

ωrot

rotor frequency, rad/s

SUBINDICES AND SUPERINDICES

x

properties on the X axis

y

properties on the Y axis

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Authors and Affiliations

  1. South Ural State University (National Research University), 454080, Chelyabinsk, Russia

    Yu. S. Sergeev, A. A. D’yakonov, S. V. Sergeev & E. N. Gordeev

Authors
  1. Yu. S. Sergeev
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  2. A. A. D’yakonov
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  3. S. V. Sergeev
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  4. E. N. Gordeev
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Corresponding author

Correspondence to S. V. Sergeev.

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Translated by L. Smolina

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Sergeev, Y.S., D’yakonov, A.A., Sergeev, S.V. et al. Increasing the Homogeneity of Liquid Aerated Concrete Mixtures from Dispersed Brittle Materials by Their Vibromixing in the Manufacture of Building Products. Theor Found Chem Eng 53, 760–768 (2019). https://doi.org/10.1134/S004057951905035X

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