Kryvyi Rih National University

Kryvyy Rih, Ukraine

Kryvyi Rih National University

Kryvyy Rih, Ukraine
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Shishkina A.,Kryvyi Rih National University
EasternEuropean Journal of Enterprise Technologies | Year: 2017

We examined a change over time of such properties of finegrained concrete as strength at compression and deformation under the action of an external load. The studies were conducted for the possibility of determining the physicomechanical properties of concretes, required to calculate the ferroconcrete structures, first of all monolithic, at different age of their fabrication. We established a relation between the rates of formation of the deformation properties and the strength at compression of fine-grained concrete. It is found that the strength of fine-grained concrete and its deformations under the action of an external load depend on the composition of concrete and the presence in it of the surface-active substances that form micelles. The existence of micelles ensures the catalysis of synthesis reactions of hydro silicate during the hardening of cement. This leads to the acceleration of formation of compressive strength and the deformative properties of concrete. An increase in the content of the given surface-active substances to a specific magnitude, which depends on the type of the used cement and the composition of concrete, leads to an increase in the strength of concretes and the rate of its formation. The magnitudes of strength of the obtained concrete and the rate of its formation also depend on the type of the utilized cement and the composition of concrete. At the same time, the optimum content of these surface-active substances, which ensures maximum magnitude of the initial modulus of elasticity of concrete prior to the age of concrete of 28 days, has not been practically established. The value of initial modulus of elasticity of concrete at this age is proportional to its content of the surface-active substances that form micelles. The studies conducted make it possible to determine the methods of control over the strength and deformativeness of fine-grained concretes for shortening the time of constructing the monolithic and the duration of hardening of the prefabricated ferroconcrete structures. © A. Shishkina, 2017.


Morkun V.,Kryvyi Rih National University | Morkun N.,National University of Management | Pikilnyak A.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2014

A method for the effective control of the pulp gas phase composition in the flotation process using dynamic effects of high energy ultrasound on the base of phased array technology and determination of its parameters are described. © Metallurgical and Mining Industry, 2014.


Morkun V.,Kryvyi Rih National University | Morkun N.,National University of Management | Tron V.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2015

The study results of nonparametric kernel estimator methods for solving the control systems identification problems of concentrating production technological aggregates in conditions of characteristics instability of the raw material, which is fed to processing, are presented. © Metallurgical and Mining Industry, 2015.


Pikilnyak A.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2015

A method for the effective control of the pulp gas phase composition in the flotation process using dynamic effects of high energy ultrasound and nature experiments on laboratory installation using high-speed video recording with data feedback via function programmed in Matlab for gas bubble size parameters monitoring and control are described.


Morkun V.,Kryvyi Rih National University | Tron V.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2014

A comprehensive optimization criterion of the ore preparation technological complex control process considering the factors of energy efficiency, environmental and economic performance of mining factory is presented. © Metallurgical and Mining Industry, 2014, No. 5.


Hryshchenko S.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2014

The article reveals the model of usage of geoinformation technologies during formation of environmental competence of future mining engineers. © Metallurgical and Mining Industry, 2014.


Morkun V.,Kryvyi Rih National University | Tron V.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2014

The ore preparation technological complex control criteria considering the factors of energy efficiency, environmental and economic performance of mining factory are considered. © Metallurgical and Mining Industry, 2014.


Marynych I.A.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2014

Rational application of intelligent systems of control based on the neuro-fuzzy operation technologies and artificial brain is given. © Metallurgical and Mining Industry, 2014.


Morkun V.,Kryvyi Rih National University | Tcvirkun S.,Kryvyi Rih National University
Metallurgical and Mining Industry | Year: 2014

The article deals with cluster analysis for determining the types of lump ore on the line of conveyer belt for further separation of lumps rich in iron. © Metallurgical and Mining Industry, 2014.


Morkun V.,Kryvyi Rih National University | Tron V.,Kryvyi Rih National University | Goncharov S.,JSC Central Concentrating Factory Komsomolskaya
Metallurgical and Mining Industry | Year: 2015

The problems of operational recognition of the dominant technological variety in the ore preparation process streams and usage of obtained data in the automated control systems of iron ore beneficiation are considered. © Metallurgical and Mining Industry, 2015.

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