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essary for the formation in concrete of the thin–capillary cement stone defining the durability and frost resis-
tance of concrete in structures.
Analysis of the different data sources reveals the diversity of industrial concrete mixing machines
which are implemented on the basis of mechanical processing in order to obtain high-quality concrete mix-
tures, i.e. to get them as homogeneous in the composition.
The latter allows to allocate the test of time and numerous scientific research method of vibration ac-
tivation of concrete mixtures, as to a particular case and in combination with conventional mechanical acti-
vation.
A vibration activation method of concrete mixtures is known for a long time, and the feasibility of
the vibratory mixing has been proved in the result of numerous researches of the scientists: Ph.D. A. Desov,
Ph.D. I. Kerov, Ph.D. V. Kuz'michev, Ph.D. G. Kunnos, Ph.D. N. Mikhailov, Prof. P. Rebinder, Ph.D. A.
Serebrennikov etc., as well as the groups of research institutions LSRIStroydormash, LSRILM, SRIRFC,
LSRIHT by B.E. Vedeneev etc.
At present various construction of vibration mixers are known [9], they are classified according to
their four main features:
• the principle of operation;
• the method of mixing;
• the structural nodes creating the vibrational fluctuations;
• the type of a vibrator.
Later, with the appearance of new construction of vibro mixers, it was proposed to classify them in
accordance with an additional feature: - constructive presence of oscillating shell elements [1-9].
However the suggested classification doesn`t reveal all vibro concrete mixer structural features, as
well as the technological features of concrete mixture preparation with the use of various magneto-electric
effects, as with conventional stirring as in combination with the vibration.
At studying the works of V. Klassen, G. Mokrousov, Y. Sarkisov, N. Gorlenko, B. Batalin etc., it
was found that the magnetic activation of mixing water and concrete mixture leads to an intensification of
the processes of dissolution and hydration of the cement in the early stages of hardening. Thus there is a
change in the rheological properties of the concrete mixture which is decreasing its porosity and, therefore,
frost resistance and water resistance to the final concrete products are increased. [10]
The data allows to make a conclusion that the impact of the external energy fields positively affects
the quality of concrete, and the constructive implementation of this idea is not difficult. Thus, another feature
should be added to the existing classification: according to the method of external energy fields.
The new feature "according to the method of external energy fields", has four its divisions, there are
magnetic, electric, ultrasonic and combined. Magnetic method in its turn is divided into the impact of
electromagnets and permanent high-energy permanent magnets. Electric method can affect the concrete
mixture with the aid of electric field of corona charge or longitudinal wave electric fields. [11]
The using of a combined method of external energy fields activity, namely vibration and magnetic
activation theoretically allow to surpass the existing units for the preparation of the mixtures with adhesive
components (in comparison with the existing analogues for the preparation of a concrete mixture), namely to
achieve:
- increase productivity in 1.5 - 2 times;
- reduce the power consumption of 1,5 - 2,5;
-reduce the cost of mixture manufacture to 20%;
- increase the strength of final products on 10 - 15%;
- reduce the time of hardening for 6 - 7 days;
- the possibility of mixing both rigid and fine materials.
The presented classification analysis allows to summarize that the using of external energy fields in
combination with the vibration in the preparation of concrete mixing reveals new possibilities in the study of
processes of vibro mixing concrete mixtures and crate the preconditions for construction of vibro concrete
mixing machines which allow to reduce the cost of preparation of concrete mixtures and improve the
qualitative characteristics of the processed material.
References:
1.
Лобанов Д.В., Фигура К.Н. Современные технологии интенсификации процессов перемешивания
бетонных смесей // Строительные и дорожные машины. 2011. № 1. С. 37-41.