Browsing by Author "Pshinko, Oleksandr M."
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Item Anti-Crisis Management of Passenger Transport as a Factor of Increasing Railway Competitiveness(Національний технічний університет «Дніпровська політехніка», Дніпро, 2020) Pshinko, Oleksandr M.; Orlovskaya, Oleksandra V.; Charkina, Tetiana Yu.; Carra, A. O.ENG: Methods. To conduct research, the following methods were used: competition, SWOT analysis, mathematical analysis, marketing models, the PEST analysis method, the decision-making method, the Kaizen approach to achieve a high degree of quality of a product or service, as well as systems approach. Results. The article proves the expediency of applying anti-crisis management of passenger transportation as a factor of increasing the competitiveness of the railway. The analysis of the development of the transport services market has shown that rail transport is gradually losing its passengers, in favor of air and road transport. The management of «Ukrzaliznytsia» has recently made many steps to improve the competitiveness of railway passenger transportation in the domestic market of transport services, but these measures are not sufficient today to restore the lost positions that the railway had before. In order to increase the level of competitiveness of railway passenger transportation, as well as to develop a larger segment in the transport services market, the following tasks are identified: to conduct research and analysis of factors affecting the current situation in the service market, to analyze the advantages of existing potential competitors in the transport services market, to analyze the experience of passenger transportation in the European Union, to develop measures that can be proposed to «Ukrzaliznytsia» to improve the efficiency of passenger services and generate additional profit. Novelty. Areas of crisis management to improve the efficiency of passenger transport are proposed, namely: the development of railway tourism, the introduction of a system of discounts «bonus ticket», the creation of a railway hub, implementation of Kaizen approach to achieve a high level of quality services, the organization of multimodal passenger transport by «travel card». Practical value. The implementation of the proposed measures and strategies will allow «Ukrzaliznytsia» to identify promising mechanisms for managing the passenger complex in the context of an escalating crisis. All these measures will help «Ukrzaliznytsia» to get out of the crisis and get additional profit for the passenger industry.Item Application of Local Exhaust Systems to Reduce Pollution Concentration Near the Road(Silesian University of Technology, Katowice, Poland, 2020) Biliaiev, Mykola M.; Pshinko, Oleksandr M.; Rusakova, Tetiana I.; Biliaieva, Viktoriia V.; Sładkowski, AleksanderEN: In this study, the methodological foundations of the technology for the local reduction of chemical pollution from vehicles were improved through the use of twolevel suction units and guide plates of various lengths installed on the nozzles of the suction devices. A program has been developed for the numerical calculation of the carbon monoxide concentration field for evaluating the efficiency of using two-level exhaust systems with different lengths of guide plates on the gas flow selection pipes. The solution of the equations of hydrodynamics and mass transfer is carried out on the basis of finite-difference methods. A number of physical and computational experiments have been carried out; it has been established that the concentration of carbon monoxide in the zone of two-level suctions location decreases by 46-68%.Item Comparative Analysis of Calculation Results of Supporting Structure of Soil-Cement Piles(Kaunas University of Technology, Kaunas, 2019) Pshinko, Oleksandr M.; Petrenko, Volodymyr D.; Tiutkin, Oleksii L.; Andrieiev, Volodymyr S.; Hubar, Oleksіy V.; Ihnatenko, Dmytro Yu.; Markul, Ruslan V.ENG: Abstract. The article presents the results of comparison of the stress-strain state of 4 models of a retaining wall structure of soil-cement piles on a landslide-prone slope. This study compares the changes in the stress distribution and displacements in the model elements of the retaining structure of soil-cement piles depending on the design parameters and the method of piles location in the body of the soil mass. The comparison of models of supporting structures of soil-cement piles on a landslide-prone slope allowed obtaining: –the comparative analysis of the quality work of individual elements of the supporting structure for strength and deformation in a three-dimensional representation; –the comparative assessment of the performance of the supporting structure of soil-cement piles on a landslide-prone slope; – histograms of dependences of changes in the angle of piles inclination to the vertical axis of their holding force, strength and deformation of the slope;Item Computing Model for Simulation of the Pollution Dispersion Near the Road with Solid Barriers(Silesian University of Technology, Gliwice, Poland, 2021) Biliaiev, Mykola M.; Pshinko, Oleksandr M.; Rusakova, Tetiana I.; Biliaieva, Viktoriia V.; Sładkowski, AleksanderENG: In this study, a numerical model is proposed for calculating pollution zones near the road, taking into account the geometry of the automobile transport, meteorological conditions, the location of the barriers and their height, and the chemical transformation of nitrogen oxides in the atmospheric air. The numerical solution is based on the integration of the mass transfer equations using the finite-difference method. To determine the components of the air flow velocity vector, a two-dimensional model of the potential flow is used, where the Laplace equation for the velocity potential is the modeling equation. Based on this numerical model, a software package has been developed that allows computational experiments and does not require large expenditures of computer time. Based on the results obtained, an assessment was made of the effectiveness of the use of barriers to reduce the level of air pollution near highways. It has been established that the use of barriers of different heights reduces the level of pollution behind the road by approximately 20-50%.Item Directions of Anti-Crisis Management of Restaurant Business(ДДУВС, Дніпро, 2021) Pshinko, Oleksandr M.; Charkina, Tetiana Yu.; Pikulina, Olena V.; Basistha, NandiniENG: In this article, the authors emphasize that the pandemic and quarantine measures have brought the normal functioning of the world economy and the activities of many enterprises. The tourism business and the hotel and restaurant sector, which have recently developed greatly, have suffered from extensive losses and bankruptcies, a large number of restaurants and cafes have been closed, and many people have lost their jobs and their income. Even large chains of hotels and restaurants have suffered as well as other businesses. The hotel and restaurant business was the first one that has to adapt quickly to changes caused by the pandemic, to stablish work in new conditions and develop new directions and measures that will take the restaurant business out of the crisis. Given the current need to apply security rules, and the need to comply with quarantine measures, it is necessary to use computer and digital technologies that will help managers to attract new customers and earn extra income. The authors propose to use such tools of crisis management of the restaurant business as: technologicalization, online marketing and influencer – marketing, unique content. These activities are necessary in order to pay new attention to the dishes and services offered by cafes and restaurants. To restart this business in a modern way and with new tendencies, and to adapt to changes in the changing environment and to quarantine measures. To develop additional promotions and offer «economy», «standard» and «luxury» class menu. To organize the fast, high-quality delivery to cafes and restaurants in modern conditions, preferably free, it has become a great necessity and convenience in pandemic conditions; it will attract additional consumers to the restaurant business. In the modern market concept of restaurants in a pandemic, it is necessary considering not only the factors that existed for many years, but also new additional factors in the hotel business, without which it is now impossible to operate this business in a pandemic, it would be safe to provide services, awareness of the service In the modern market concept of restaurants in a pandemic, it is necessary considering not only the factors that existed for many years, but also new additional factors in the hotel business, without which it is now impossible to operate this business in a pandemic, it would be safe to provide services, awareness of the service or product, in the use of digital technology by an institution that wants to get more income and occupy a larger segment in this market of hotel and restaurant business. The authors insist that in modern conditions, it is essential to take into account the laws of competition; because now the consumer chooses a quality product or service at a better price, other goods or services do not attract consumers.Item Economic and Mathematical Models of Development of the Railway Tourism(NTI-UkrSURT, Kharkiv, Ukraine, 2019) Pshinko, Oleksandr M.; Martseniuk, Larysa V.; Bobyl, Volodymyr V.; Kakhovska, OlenaENG: Abstract. The authors used a complex of mathematical models meant for the optimal investment of the processes of creation and use of the railway transport infrastructure. The specific features of these models are as follows: long-term period of realization of the infrastructure projects, many participants with special interests, which do not always coincide, a lot of factors of uncertainty connected with the choice of quantities of the calculation parameters, etc. The authors created economic-mathematical models of the discrete optimal planning of the railway tourism operations. This takes into account conditions of risks and cooperation, and allows to determine sets of effective routes which are most profitable ones, provided they meet the established demands. The latter includes routes which meet maximum criteria of the net costs under the conditions of the established system of demands for the activity of the tourism operators.Item Effect of the State of Car Running Gears and Railway Track on Wheel and Rail Wear(Technical University of Budapest, Budapest, 1998) Blokhin, Evgen P.; Pshinko, Oleksandr M.; Danovich, Viktor D.; Korotenko, Mykhaylo L.EN: This paper presents the results of theoretical research and real condition experiments which were conducted with the purpose of determining the influence of the open goods wagon running gear characteristic parameter deviations from their nominal values on the wheel and rail wear. The experimental results has confirmed the reliability of conclusions made on the basis of modelling.Item Hubs as a Key Tool for Improving the Quality of the Service and Development of Multimodal Passenger Traffic(The Silesian University of Technology, Faculty of Transport, Katowice, Poland, 2022) Pshinko, Oleksandr M.; Charkina, Tetiana Yu.; Martseniuk, Larysa V.; Orlovska, Olexandra V.ENG: This article stresses the need to develop multimodal passenger transport. Particular attention is paid to the construction of HUBs based on railway stations. HUB is the transport interchange node, passenger complex, which redistributes passenger flows between transport modes and directions. They allow to optimize transportation processes, as well as to create an infrastructure for convenient and fast passenger transfer between different transport modes. The preconditions for creating organizational conditions to ensure the sustainable development of the passenger railway transport sector are outlined. In the near future, combined passenger transport with the participation of several modes of transport will attract tourists from around the world. The authors’ concept of the term “passenger comfort zone” is proposed, which takes into account all the needs of modern tourists. The mechanism of multimodal transportations of passengers by railway transport in interaction with other participants of the servicing process is presented. A model of institutional support for the development of multimodal passenger railway transport is proposed to create conditions for integrated transport services for passengers by the passenger railway transport complex. The expediency of forming a system of railway passenger HUBs in Ukraine is vital to attracting investments to improve transport and tourism infrastructure, as well as to roll stock and a range of services for the benefit of all stakeholders in the transport sector (e.g., the state, investors, and passengers).Item Hydraulic Concrete Composition and Properties Control System(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2015) Pshinko, Oleksandr M.; Krasnyuk, Andrey V.; Hromova, Olena V.EN: Purpose. Scientific work aims at the development and testing of information system to meet the challenges of concrete composition design and control (for railway structures and buildings) based on the physico-analytical method algorithm for hydraulic concrete composition calculation. Methodology. The proposed algorithm of hydraulic concrete composition calculation is based on the physicochemical mechanics and in particular on the rheology of elastic–viscous–plastic bodies. The system of canonical equations consists of the equations for concrete strength, absolute volume, concrete mix consistency as well as the equation for optimal concrete saturation with aggregates while minimizing cement content. The joint solution of these four equations related to composition allows determining for the materials the concrete composition of required strength, concrete workability with minimum cement content. The procedure for calculation of hydraulic concrete composition according to the physico-analytical method consists of two parts: 1) physical, which is laboratory testing of concrete mix components in different concrete compositions; 2) analytical, which represents the calculation algorithm for concrete compositions equivalent in concrete strength and workability that comply with the specific conditions of concrete of designing the concrete composition with the desired properties for railway structures and buildings it was proposed to use the information technology in the form of a developed computer program whose algorithm includes the physico-analytical method for hydraulic concrete composition determination. Originality. The developed concrete composition design method takes into account the basic properties of raw materials, concrete mix and concrete, which are predetermined. The distinctive feature of physico-analytical method is obtaining of a set of equivalent compositions with a certain concrete mix consistency and required concrete strength, which allows to optimize the concrete composition by any optimality criterion, depending on the operation conditions. Practical value. Using the developed method will expand its functionality when applied in the form of the composition calculation computer program for the construction and repair of surface and underwater structures. The use of physico-analytical methodat production site will simultaneously solve the economic problems of construction and maintenance cost reduction,component saving and ensure obtaining the concrete with the set properties for specific operation conditions of transport engineering structures.Item Improvement of Concrete and Building Mortar Technology Using Secondary Mineral Resources(Національний гірничий університет, Дніпро, 2022) Pshinko, Oleksandr M.; Pavlenko, T. M.; Dekhta, Tatyana M.; Hromova, Olena V.; Steinbrech, Oksana V.ENG: Purpose. Improving the technology of concretes on the basis of secondary mineral resources (waste foundry sand of metallurgical and machine-building industry, ash-and-slag mixes of thermal power plants). Methodology. Generally accepted standard methods in the study of the basic properties of raw materials, concrete mixes and concretes are used in the work. The samples were moulded using specially made laboratory vacuum equipment. Findings. The study results on the main properties of concretes on the basis of secondary mineral resources confi rmed the effectiveness of vibrovacuum technology. For example, the strength of ash-and-slag vacuum concrete is on average higher than the strength of vibrocompacted concrete from a mobile concrete mix by 6–10 MPa or by 60–100 % (depending on the cement consumption). Also, high-quality concretes with moderate cement consumption for various types of construction are obtained on the basis of waste foundry sand. Originality. Scientifi c and technical bases of the technology of vibrovacuum concrete on the basis of waste foundry sand and ash-and-slag mixes were developed. Practical value. Through the development of the technology of vibrovacuum products based on secondary mineral resources concrete, high-quality concretes (increased strength, frost resistance, etc.) were obtained for road and other types of construction. This technology allows applying the existing technological equipment without fundamental design changes, carrying out immediate dismantling of moulded products, which signifi cantly reduces the metal consumption of the technology.Item Improving the Efficiency of the Heating System for Public Buildings Infrastructure in the Context of DNURT(Дніпропетровський національний університет залізничного транспорту імені академіка В. Лазаряна, Дніпропетровськ, 2016) Pshinko, Oleksandr M.; Kuznetsov, Valeriy; Yatsenko, Dmytro K.; Gabrіnets, Volodymyr O.EN: Purpose. The paper analyses the possibility and terms of increasing the efficiency of heating and ventilation systems of public buildings at the present stage of development and the specific climatic conditions of Ukraine. The main purpose is to develop specific measures for public buildings, which will lead to a significant reduction in energy costs for heating and air conditioning system. The example is similar system of DNURT compact campus, which is heated with its own autonomous boiler that uses natural gas. Methodology. The statistical heat loss analysis for the last 5 years allows defining the types and calculating the heat loss values for specific conditions. These losses are compared with those in the world practice and based on the comparison and analysis of the current system there are offered the ways to reduce the heat loss values through the use of various technical and organizational methods. The paper also proposes involvement for this purpose of secondary and alternative energy sources. The secondary energy resources include the heat that is emitted by people and that coming out with the air during ventilation of buildings. The renewable sources include solar and geothermal energy. To enhance the heat transfer medium temperature capacity it is proposed to use the heat pumps. Findings. The maximum possible use of the proposed measures and implementation of rational schematic and engineering solutions for heat and hot water supply systems cam reduce the energy loss for heating and hot water by 30-35%. Originality. The paper for the first time proposed the use of new integrated approaches to maintain the desired heat balance in the winter period, as well as the new schematic solutions for heating and ventilation systems, both in winter and in summer, based on the use of heat pumps and secondary energy resources. Practical value. The introduction of the proposed schematic solutions and approaches demand relatively small capital investments and do not require significant reconstruction of already installed systems.Item The Influence of the «Train-Track» System Parameters on the Maximum Longitudinal Forces' Level(Silesian University of Technology, Katowice, Poland, 2019) Pshinko, Oleksandr M.; Ursulyak, Liudmyla V.; Kostrytsia, Serhii A.; Fedorov, Yevhen F.; Shvets, Anzhela O.EN: The main objective of the simulation is to study the effect caused by the parameters of the longitudinal profile on the maxima of longitudinal forces in freight trains of increased length during adjustment braking and running-out. To decrease the number of numerical experiments, some empirical formulae for estimating the maximum longitudinal forces during the motion of freight trains along the track with various configurations of its longitudinal profile's gradient changes have been obtained for the first time. Comparison of those forces with the permitted values, from the point of view of the railway stock strength and eventual vehicle derailment, has been performed. As a result of numerical integration of the system of non-linear differential equations of train motion for the considered driving modes, the values of the greatest longitudinal shock and quasi-static forces, as well as the dependence of the latter on the train length, initial braking velocity, on the algebraic difference of gradients and the length of the horizontal area that separates two gradients with opposite signs are estimated. The proposed mathematical model and methodology can be applied during standardization of the longitudinal profile's parameters from the point of view of the freight traffic safety for the trains of various length.Item Mathematical Modeling of Aeroion Mode in a Car(The Silesian University of Technology, Katowice, Poland, 2022) Biliaiev, Mykola M.; Pshinko, Oleksandr M.; Rusakova, Tetiana I.; Biliaieva, Viktoriia V.; Sładkowski, AleksanderENG: Summary. In this study, a mathematical method is proposed for calculating the concentration field of air ions of different polarities and dust levels in the passenger compartment, taking into account the geometry of the passenger compartment and seats, shelves, and other internal elements of the passenger compartment. The method also takes into account changes in the rate of the air flow ventilation, the location and number of ionizers, and sources of positive ions and dust, taking into account their different intensities and locations. On the basis of a numerical model for this method, software has been developed that allows users to carry out computational experiments without requiring much time for calculation. Based on the results, the optimal location of the ionizer in the passenger compartment of the car was determined to ensure comfortable conditions for the stay of passengers, which favorably affects their health. It has been found that the presence of two ionizers is optimal for creating comfort in the car with an ionization intensity of ions/s located at the top of the car. If there is one ionizer located on the dashboard or at the top of the car with a higher ionization rate than ions/s, it is not possible to simultaneously provide optimal ionization parameters for passengers in the front and rear seats of the car.Item Peculiarities of Structural Characteristics of Modified Concrete Cement System at the Early Stages of Hardening(Придніпровська державна академія будівництва та архітектури, 2019) Pshinko, Oleksandr M.; Rudenko, Dmytro V.EN: Abstract. Purpose. Determination of the types of bonds formed in the modified concrete cement matrix and the evaluation of the quality of these bonds in a inhomogeneous material for the determination of geometric and physical relationships between the structure of modifiers and the cement matrix at the early stage of structure formation. Method. Investigation of the processes of hydration and structure formation of conventional and modified cement systems was carried out using X-ray diffraction, differential-thermal and microscopic analyses, and infrared spectroscopy. The analysis of the structural parameters of the cement matrix of concrete was carried out by the method of mercury porosimetry, as well as the adsorption of water and nitrogen vapor. Results. The system of assembling with the corresponding structure is formed during the layout and contact of the mineral components of the cement system and aggregate grains in the process of mixing with water, stirring and placing of concrete mixture. The change in the quantitative characteristics of the structure of modified concrete was observed at the change in the intensity of modification. Observed changes in the morphological structure of the cement matrix cannot be random, as they are confirmed by repeated experiments at reproducibility from 82 to 96 %. At the same time, such a change in the morphology of new formations was not observed in normal concrete. From the given data, a significant increase in the lamellar-prismatic component in the cement matrix of modified concrete is obvious. The number of formed crystalline new formations increases with the increase of curing time. This can be explained by the system approach: the morphology of the structure of the cement matrix − the result of the interaction of systems of assembly and growth. At the same time, the growth system (recrystallization and development of the structure in time) can effectively develop without a sufficiently complete development of the system of assembly (accumulation of primary products of hydration). Scientific novelty. For the first time, the peculiarities of the structured formation of the modified cement system have been established, they consist in the fact that magnesium chloride hydrate crystals grow rapidly in the space between the hydrated new formations of clinker minerals, and as the result, the mechanical bond is responsible for the development of initial strength and stiffness. Since the free growth of crystals is hindered by the lack of space, the crystals mutually germinate, forming a dense structure that causes the growth of strength; it was first established that in a modified hydrated cement system, as a result of the interaction of different macroions, a structure-forming process develops with a predominance of active parts that significantly exceed its dissipative part in comparison with normal cure conditions. The results obtained in modeling the behavior of the modified cement system, which is hydrated, show that the system has fluctuations in the concentration of intermediate products of hydration, identified with the appearance of the spatial-temporal structure. Practical relevance. Physico-chemical modification of the cement system provides a change in the morphotropy of new crystalhydrate formations, which will contribute to the formation of the design properties of concrete.Item Postmodern Conflictology: Issues of Theory and Approaches to Methodology(Publishing House "Grani", 2021) Vlasova, Tetiana I.; Pshinko, Oleksandr M.; Vlasova, Olga P.ENG: The problematization of the classical concepts in the postmodern philosophy has created some definite challenges that stipulate the development of the “Theory” in its interdisciplinary conceptual meanings and practical applications. The latter demands a certain “list” of the new notions and implies requirements for theorists to reflect the scientific diversity without reducing it to any kind of “theoretical unity”. For these reasons the purpose of this article is the conceptual reconstruction of the notion of the conflict in the specific postmodern context of its sociocultural, political and ethical meanings and senses. The methods of the research are mainly based on the principle of the anthropocentric paradigm, which stipulates the use of the interdisciplinary comparative-critical approaches and social construction methods in the general problematic field of postmodernism. While analysing conflict theories such schools of philosophy as existententialism, phenomenology and pragmatism are considered to be valid in the descriptions of both the actual conditions of the individual human existence and abstract human qualities. The practical aspects of this paper involve the empirical representation of the principles of the value and the sense in the problematic aspects of conflict resolution with the stress on the concepts of the discoursive communication. The obtained results allow to come to the conclusion that the most influential transformations are connected with such postmodern conflict problems as asymmetrical threats and unstable security architecture. The latter proves that the methodological approaches to conflictology should be evaluated from the point of presumably successful resolutions against the background of different spatial and temporal factors, which, in its turn, means creating new administrative modalities of conflict management. It should be stressed that in the context of the conflictological tendencies of the globalizing societies the special place should be occupied by the principles of K.- O. Apel’s discoursive ethics and M. M. Bakhtin’s doctrine of the “responsible dialogism”. Nowadays political approaches cannot be effective in the conflict resolutions without the classical ideals and the absolutes, without the impact of the Pathos, which means implied significance of the “relatively Utopian” ideas and their application in the conflict resolution, the potential possibilities of their realization in the conflict situations.Item Project of Libertarianism in the Conceptual Interpretation of Postmodernity: Microcosm VS Macrocosm and the “Inbetween Man”(Khachatur Abovian Armenian State Pedagogical University, Yerevan, RA, 2021) Vlasova, Tetiana I.; Pshinko, Oleksandr M.; Bondarchuk, Serhiі; Veprytskyi, RomanEN: The ambivalence of meanings in the postmodern theories accentuates the hermeneutic interpretation of concepts: the new “cosmic meanings” have changed the world picture i n q uite a r evolutionary way. Though the views on postmodernism are contradictory, of principle importance is the idea that there are some valid “inventions”, which have given meaning to this term; in politics, it is the rise of neoliberalism and libertarianism. Thus, the paper aims to research the interrelation of the “inner” logic of the “free individual”, his/her micro-and macrocosm in libertarianism with the external political transformations and ideological discourses of postmodernity. The research results show that science and arts allow focusing on the interpretation of the consequences of those phenomena, which are going on at the level of the “political unconscious”. The theorists insist on rethinking the categories of libertarianism: the included concepts are challenging to combine in the principle of the domination of liberty. The focus on libertarianism stipulates the novelty of the research as the postmodern feature, which provides validity to the term “late postmodernism”. The new cosmology of the third millennium gives the possibility to use the term “cosmological postmodernism”.Item Regional Peculiarities of Rural Tourism Development in Ukraine (Using an Example of Dnipropetrovsk Region)(SHEE “Prydniprovska State Academy of Civil Engineering and Architecture”, Dnipro; Slovak University of Technology, Bratislava, Slovakia, 2018) Bondarenko, Olga; Pshinko, Oleksandr M.; Husenicova, JarmilaEN: Recreational development of rural areas enhances expanding the range of recreational services for citizens at a different qualitative and content level, and also contributes to revival and preservation of historical and cultural heritage of the region in general and the Ukrainian village in particular ensuring activation of social and economic development of the regional rural areas.Item Research of Operational Properties of Modified Specialized Concrete for Transport Constructions(EDIS, University of Zilina, Slovakia, 2019) Pshinko, Oleksandr M.; Shcherbak, Andriy S.; Rudenko, Dmytro V.EN: It was established that the polymeric component of the organomineral modifying complex changes the nature of the super-molecular structures in the activated cement system - at optimal filling, globules decrease in size preventing the phase surface diffusion, which contributes to increase of the waterproofness of modified concrete. When introducing a modified cement system into the concrete mixture, the reduction of the open porosity to 3-5 %, depending on the composition, has been achieved. Conducted tests for water resistance and frost resistance of the repair layer of concrete showed that the modified concrete corresponds to the mark on water resistance W14 and the brand on the frost resistance F300. The developed technology of physico-chemical activation of the cement system allows the use of conventional cement for obtaining durable concrete of special purpose, which allows to reduce the cost of such concrete by 27-34 %.Item Research of Railway Crashed Stone Use of 40 –70 mm Fraction(Kaunas University of Technology, 2018) Pshinko, Oleksandr M.; Patlasov, Oleksandr M.; Andrieiev, Volodymyr S.; Arbuzov, Maxim; Hubar, Oleksіy V.; Hromova, Olena V.; Marcul, Ruslan V.ENG: The results of the conducted researches on operating, physical and mechanical properties of crushed stone of 40-70 mm fraction are presented in the article as well as the results of the comparison of the given fraction with the fraction of 25-60 mm and determination of the former fraction usage for the ballast with the purpose of more rational fund use during railway repair works. The conducted researches of 40-70 mm fraction of crushed stone allowed receiving: – actual values of technical indices of the product and adopted technical decisions; – conformity of the product with the operating conditions as well as physical and mechanical properties during track maintenance; – ability to perform tests; – comparison of physical, mechanical and operational properties of crushed stone of 40-70 mm fraction with the crushed stone of 25-60 mm fraction.Item Study of Rheological Properties of Modified Concrete Mixtures at Vibration(Trans Tech Publications LTD, Switzerland, 2019) Pshinko, Oleksandr M.; Hromova, Olena V.; Rudenko, Dmytro V.EN: Abstract: Study of rheological properties of concrete mixtures based on modified cement systems in order to determine process parameters. Methodology. To study structural-mechanical properties of modified concrete mixtures of different consistency at their horizontal vibrating displacement an oscillatory viscometer was designed. Results. The optimization of the process of vibration displacement of concrete mixtures with the specification of parameters of vibration impacts taking into account structural-mechanical properties of the mixture is performed. It has been established that the viscosity of the modified cement system of the concrete mixture is a variable quantity, which depends on the parameters of the vibration impacts. Scientific novelty. The mechanism of interaction of the modified concrete mixture with the form and the table vibrator during its vibration compaction is determined. On the basis of this, a model of concrete laying process control is proposed, that allows to predict the ability to form a dense concrete structure. Practical significance. Disclosed physical nature of the process of vibrating displacement of modified concrete mixtures using the principles of physical-chemical mechanics of concrete allows reasonably choose the best options for vibration impacts.