scholarly journals Study of the strength dependence of concrete for mine construction on the content of coal mining waste in it

2021 ◽  
Vol 315 ◽  
pp. 02006
Author(s):  
Alexandr Liskovec ◽  
Natalya Gilyazidinova ◽  
Vladimir Duvarov ◽  
Victor Tacienko
Keyword(s):  
Coal Mining ◽  
Coal Dust ◽  
Fine Fraction ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Mining Waste ◽  
Dust Particles ◽  
Strength Performance ◽  
Quantitative Content ◽  
Strength Dependence

The possibility of using coal mining waste in mine concrete mixing is considered in the article. As a result of the research, scientific and practical results have been obtained that make it possible to evaluate the strength properties of mine concrete, depending on the content of coal dust particles - the waste of mining - in it. It has been experimentally proven that when a fine fraction of coal is added to mine concrete, the strength of concrete decreases at a certain ratio, but this strength is sufficient to ensure the required properties. As a result of the experiments, samples of concrete for mine construction were manufactured, into which a fine fraction of coal - coal dust - was added in various ratios. A series of mine concrete tests was carried out to determine its physical and mechanical properties; the optimal composition was determined, which provides process and strength performance of the mixture. The conclusions have been drawn about the quantitative content of a fine fraction of coal in mine concrete, which make it possible to maintain process performance of the mixture and the strength of structures.

scholarly journals Studies of the Possibility of Using Coal Mining Waste in Concrete for Mine Construction

2020 ◽  
Vol 174 ◽  
pp. 01012
Author(s):  
Natalya Gilyazidinova ◽  
Vladimir Duvarov ◽  
Akparali Mamytov
Keyword(s):  
Coal Mining ◽  
Liquid Glass ◽  
Setting Time ◽  
Fine Fraction ◽  
Mining Waste ◽  
Coal Waste ◽  
Technological Parameters ◽  
Optimum Quantity ◽  
Coal Wastes

The article discusses the possibility of using coal waste for the preparation of mine concrete. As a result of the research, scientific and prac- tical results were obtained. It has been experimentally proved that when a small fraction of coal, which is a waste of coal mining, is added to mine concrete, the strength of concrete decreases, but with a certain ratio of this strength it is sufficient to ensure the required properties. A series of experi- ments was carried out with the addition of liquid glass to the concrete to control the setting time of the mixture. The properties of coal wastes were determined and the possibility of their use in mine concrete was investigated. It has been established that the introduction of a fine fraction of coal in the optimum quantity into the composition of mine concrete is possible without reducing technological parameters.

To the question about the utilization of coal mining waste

2019 ◽  
Vol 5 (10) ◽  
pp. 153-158
Author(s):  
E.I. Khabarova ◽  
◽  
E.S. Zarubina ◽  
Keyword(s):  
Coal Mining ◽  
Mining Waste

Analysis of the stress-strain state of copper M0B under different schemes of equal channel angular pressing and its effect on the structure and physical and mechanical properties

2019 ◽  
pp. 47-53
Author(s):  
L. F. Sennikova ◽  
G. K. Volkova ◽  
V. M. Tkachenko
Keyword(s):  
Equal Channel Angular Pressing ◽  
Strain State ◽  
Physical And Mechanical Properties ◽  
Strength Properties ◽  
Stress Strain ◽  
Loading Pattern ◽  
Stress Strain State ◽  
Angular Pressing ◽  
Fine Copper ◽  
Copper Structure

The results of studies of the stress-strain state of copper M0b after deformation under different schemes of equal channel angular pressing (ECAP) are presented. The level of macro and micro stresses in copper has been determined in various ECAP modes. It is shown that the strength properties, deformation porosity and parameters of the fine copper structure differ depending on the loading pattern.

scholarly journals Quantitative analysis of fine dust particles on moss surfaces under laboratory conditions using the example of Brachythecium rutabulum

2021 ◽  
Author(s):  
Bilitis Désirée Vanicela ◽  
Martin Nebel ◽  
Marielle Stephan ◽  
Christoph Riethmüller ◽  
Götz Theo Gresser
Keyword(s):  
Fine Fraction ◽  
Model Organism ◽  
Dust Particles ◽  
Quantitative Detection ◽  
Suitable Model ◽  
Fine Dust ◽  
Sem Images ◽  
Moss Species ◽  
Laboratory Conditions ◽  
Number Of Particles

AbstractThe identification of a model organism for investigations of fine dust deposits on moss leaflets was presented. An optical method with SEM enabled the quantitative detection of fine dust particles in two orders of magnitude. Selection criteria were developed with which further moss species can be identified in order to quantify the number of fine dust particles on moss surfaces using the presented method. Among the five moss species examined, B. rutabulum had proven to be the most suitable model organism for the method presented here. The number of fine dust particles on the moss surface of B. rutabulum was documented during 4 weeks of cultivation in the laboratory using SEM images and a counting method. The fine dust particles were recorded in the order of 10 μm–0.3 μm, divided into two size classes and counted. Under laboratory conditions, the number of particles of the fine fraction 2.4 μm–0.3 μm decreased significantly.

Research on Intelligent Control of the Dust in Coal Mining

2012 ◽  
Vol 482-484 ◽  
pp. 1805-1808
Author(s):  
Zhao Ran Zhang ◽  
Guo Qing Liu ◽  
Xiao Sheng Bai ◽  
Guo Liang Yang
Keyword(s):  
Coal Mining ◽  
Intelligent Control ◽  
Coal Dust ◽  
Working Environment ◽  
Coal Face ◽  
Good Working ◽  
Mining Coal ◽  
Good Working Environment

The harm of coal dust under mining coal is really serious, so how to effectively control it has always been a tough problem. This paper analyzes the cause of creating dust over the coal face, and introduces the application of dust intelligent control in detail based on the reality situation of coal mining. Though the application of intelligent dustproof system, the concentration of the coal dust has been reduced by 333.9mg/m3 to 21.7mg/m3, the result is creating a good working environment for workers, this system has the higher valuable application.

A VGGNet-like approach for classifying and segmenting coal dust particles with overlapping regions

2021 ◽  
Vol 132 ◽  
pp. 103506
Author(s):  
Zheng Wang ◽  
Xu Zheng ◽  
Dongyan Li ◽  
Helin Zhang ◽  
Yi Yang ◽  
...  
Keyword(s):  
Coal Dust ◽  
Dust Particles

COMBUSTION OF A GAS SUSPENSION OF COAL DUST IN A SWIRLING FLOW

2021 ◽  
pp. 139-147
Author(s):  
K.M. Moiseeva ◽  
◽  
A.Yu. Krainov ◽  
E.I. Rozhkova ◽  
◽  
...  
Keyword(s):  
Flow Velocity ◽  
Swirling Flow ◽  
Coal Dust ◽  
Combustion Efficiency ◽  
Dust Particles ◽  
Gas Temperature ◽  
Flow Swirl ◽  
Angular Component ◽  
Air Suspension ◽  
The Impact

Swirling combustion is currently one of the most important engineering problems in physics of combustion. There is a hypothesis on the increase in the combustion efficiency of reacting gas mixtures in combustion chambers with swirling flows, as well as on the increase in the efficiency of fuel combustion devices. In this paper, it is proposed to simulate a swirling flow by taking into account the angular component of the flow velocity. The aim of the study is to determine the effect of the angular component of the flow velocity on the characteristics of the flow and combustion of an air suspension of coal dust in a pipe. The problem is solved in a twodimensional axisymmetric approximation with allowance for a swirling flow. A physical and mathematical model is based on the approaches of the mechanics of multiphase reacting media. A solution method involves the arbitrary discontinuity decay algorithm. The impact of the flow swirl and the size of coal dust particles on the gas temperature distribution along the pipe is determined.

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