Pub Date : 2023-04-12DOI: 10.34031/2071-7318-2023-8-6-26-34
P. Kladieva
The main problem of reinforced flexible structures made of cellular concrete is a rather low specific adhesion at the border of the reinforcement with concrete. This negatively affects the pulling out of the reinforcement from the porous mass and leads to premature loss of the bearing capacity of the structure as a whole. The underestimation of the significant potential of the unused bearing capacity of the structure when using traditional reinforcement provides for the need to improve approaches to the reinforcement of flexible cellular concrete structures. Efficient reinforcement of cellular concrete structures is proposed to be carried out with reinforcing elements with a developed lateral surface - steel toothed belts, which significantly increase the contact area and qualitatively improve contact conditions. At the stage of computational justification, the results of an experimental study of the strength and deformability of samples of innovative reinforcing elements of steel toothed belts with various configurations of longitudinal perforation, which help to reduce the metal consumption of cellular concrete structures operating in bending, and directly improve their functional characteristics - thermal resistance and wave conductivity, are analyzed. The revealed variations in the physical and mechanical properties of reinforcement due to the changing pattern of its longitudinal perforation and the average characteristics of reinforcement used in the design analysis of reinforced cellular concrete structures are used to propose practical approaches to normalizing the values of characteristics and technologies for calculating reinforced cellular concrete structures
{"title":"EXPERIMENTAL INVESTIGATIONS OF THE DESIGN STRENGTH OF STEEL TOOTHED BELTS IN THE COMPOSITION OF REINFORCED CELLULAR CONCRETE BEAMS","authors":"P. Kladieva","doi":"10.34031/2071-7318-2023-8-6-26-34","DOIUrl":"https://doi.org/10.34031/2071-7318-2023-8-6-26-34","url":null,"abstract":"The main problem of reinforced flexible structures made of cellular concrete is a rather low specific adhesion at the border of the reinforcement with concrete. This negatively affects the pulling out of the reinforcement from the porous mass and leads to premature loss of the bearing capacity of the structure as a whole. The underestimation of the significant potential of the unused bearing capacity of the structure when using traditional reinforcement provides for the need to improve approaches to the reinforcement of flexible cellular concrete structures. Efficient reinforcement of cellular concrete structures is proposed to be carried out with reinforcing elements with a developed lateral surface - steel toothed belts, which significantly increase the contact area and qualitatively improve contact conditions. At the stage of computational justification, the results of an experimental study of the strength and deformability of samples of innovative reinforcing elements of steel toothed belts with various configurations of longitudinal perforation, which help to reduce the metal consumption of cellular concrete structures operating in bending, and directly improve their functional characteristics - thermal resistance and wave conductivity, are analyzed. The revealed variations in the physical and mechanical properties of reinforcement due to the changing pattern of its longitudinal perforation and the average characteristics of reinforcement used in the design analysis of reinforced cellular concrete structures are used to propose practical approaches to normalizing the values of characteristics and technologies for calculating reinforced cellular concrete structures","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81124497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-12DOI: 10.34031/2071-7318-2023-8-6-8-16
Azmi Othman, N. Chernysheva, M. Drebezgova, T. Novichenkova, B. Margolis
The primary task of technologists-designers is to optimize the structure and properties of building composite materials. Its achievement allows simultaneously increasing their efficiency, reliability and durability. The article presents the results of determining the granulometric composition of a composite gypsum binder (CGB) by computational and experimental modeling using the known equations of "ideal" curves. Due to the fact that when designing the binder composition, one of the main tasks is to optimize its structure at the micro level with finding the best ratios sizes and quantitative content of particles in the hardening system to create a dense packing, in the work a comparison is made of the granulometric compositions of 3, 4 and 5-component KGV. It has been established that the developed 5-component composition of KGV, including (% by weight): 68 % gypsum binder (G5B-II - 70% and GVVS-16 – 30 %), 10 % Portland cement, 20% fine quartz sand, 0.5 % metakaolin VMK-45 and 1.5% limestone dust, in terms of the ratio of components and their granulometric composition, deviates from that calculated using a computer program using the equations of the "optimal" Funk-Dinger curve by 15.3 %, which causes a denser packing of its particles with an increase in average density, strength indicators and softening coefficient even with a decrease in the content of gypsum binder
{"title":"INFLUENCE OF GRANULOMETRIC COMPOSITION OF THE COMPOSITE GYPSUM BINDER ON ITS PROPERTIES","authors":"Azmi Othman, N. Chernysheva, M. Drebezgova, T. Novichenkova, B. Margolis","doi":"10.34031/2071-7318-2023-8-6-8-16","DOIUrl":"https://doi.org/10.34031/2071-7318-2023-8-6-8-16","url":null,"abstract":"The primary task of technologists-designers is to optimize the structure and properties of building composite materials. Its achievement allows simultaneously increasing their efficiency, reliability and durability. The article presents the results of determining the granulometric composition of a composite gypsum binder (CGB) by computational and experimental modeling using the known equations of \"ideal\" curves. Due to the fact that when designing the binder composition, one of the main tasks is to optimize its structure at the micro level with finding the best ratios sizes and quantitative content of particles in the hardening system to create a dense packing, in the work a comparison is made of the granulometric compositions of 3, 4 and 5-component KGV. It has been established that the developed 5-component composition of KGV, including (% by weight): 68 % gypsum binder (G5B-II - 70% and GVVS-16 – 30 %), 10 % Portland cement, 20% fine quartz sand, 0.5 % metakaolin VMK-45 and 1.5% limestone dust, in terms of the ratio of components and their granulometric composition, deviates from that calculated using a computer program using the equations of the \"optimal\" Funk-Dinger curve by 15.3 %, which causes a denser packing of its particles with an increase in average density, strength indicators and softening coefficient even with a decrease in the content of gypsum binder","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80200179","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-04-12DOI: 10.34031/2071-7318-2023-8-6-55-64
A. Tiraturyan, K. Semenenya-Dusenko, P. Deuntcha
Modern approaches to the assessment of the operational stage of the life cycle of the highway are analyzed. The necessity of improving the criteria characterizing the condition of the highway at this stage, taking into account both the structural properties of the pavement and functional parameters reflecting the comfort and safety of users, is noted. As the main indicator of the condition of the highway at the operational stage of the life cycle, an indicator is proposed – the total energy dissipation. The possibility of using the indicator "total energy dissipation" is considered - as an integral criterion characterizing the operational stage of the life cycle of a highway, taking into account the cumulative effect of transport loads, the structural condition of the pavement and the influence of various types of control actions on the change in the duration of its service life, and the results of modeling the influence of control actions in the form of repairs on the change in the actual curve of total energy dissipation are presented, the prospects for the development of this indicator as the main one, to implement the "life-cycle assessment" methodology, assuming the allocation of the total energy dissipation – "dangerous" energy spent on the destruction of the pavement of the highway, as well as the share of energy correlated with the fuel costs of users, and acoustic pollution of the environment from the traffic flow. The directions of development of the corresponding mathematical models for solving the tasks are determined
{"title":"ENERGY DISSIPATION AS A CRITERION FOR ANALYZING THE CONDITION OF A HIGHWAY AT THE OPERATIONAL STAGE OF ITS LIFE CYCLE","authors":"A. Tiraturyan, K. Semenenya-Dusenko, P. Deuntcha","doi":"10.34031/2071-7318-2023-8-6-55-64","DOIUrl":"https://doi.org/10.34031/2071-7318-2023-8-6-55-64","url":null,"abstract":"Modern approaches to the assessment of the operational stage of the life cycle of the highway are analyzed. The necessity of improving the criteria characterizing the condition of the highway at this stage, taking into account both the structural properties of the pavement and functional parameters reflecting the comfort and safety of users, is noted. As the main indicator of the condition of the highway at the operational stage of the life cycle, an indicator is proposed – the total energy dissipation. The possibility of using the indicator \"total energy dissipation\" is considered - as an integral criterion characterizing the operational stage of the life cycle of a highway, taking into account the cumulative effect of transport loads, the structural condition of the pavement and the influence of various types of control actions on the change in the duration of its service life, and the results of modeling the influence of control actions in the form of repairs on the change in the actual curve of total energy dissipation are presented, the prospects for the development of this indicator as the main one, to implement the \"life-cycle assessment\" methodology, assuming the allocation of the total energy dissipation – \"dangerous\" energy spent on the destruction of the pavement of the highway, as well as the share of energy correlated with the fuel costs of users, and acoustic pollution of the environment from the traffic flow. The directions of development of the corresponding mathematical models for solving the tasks are determined","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79793553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-14DOI: 10.34031/2071-7318-2022-8-3-97-110
V. Supranovich, A. Safronova
The article deals with the actual problem of integrating waste processing facilities (WRO) into the urban structure. The purpose of the work is to identify trends in the formation of WROs and formulate recommendations for including these objects in the context of the environment of St. Petersburg. As part of the research work in 2022, the Department of Architectural Design of SPbGASU carried out a comprehensive analysis of the sites proposed by the St. Petersburg Civil Aviation Committee for the placement of these objects. The general territorial requirements that impact the subsequent design of the WRO have been established. A systematic analysis of foreign experience in designing WROs has been carried out, and factors - internal and external - that affect the formation of the studied objects have been identified. It has been established that the solution of interrelations between internal and external factors leads to the organization of subordinate pairs of factors. The main trends in the creation of space-planning parameters of waste processing buildings are determined, taking into account the humanization of their appearance: the multifunctionality of the object, configuration options for the technological module, the influence of the environment on the shape of the object (imitation of the nature of the relief) and landscaping of facades. The obtained results are systematized and recommendations are given in the formation of WRO in the conditions of St. Petersburg: at the level of the general plan of the WRO, organization of the functional zoning of the object, comparison of the image of the building with the urban environment and / or landscape.
{"title":"SHAPING TRENDS OF WASTE RECYCLING OBJECTS. MAIN DIRECTIONS AND THEIR IMPACT ON WRO ARCHITECTURE","authors":"V. Supranovich, A. Safronova","doi":"10.34031/2071-7318-2022-8-3-97-110","DOIUrl":"https://doi.org/10.34031/2071-7318-2022-8-3-97-110","url":null,"abstract":"The article deals with the actual problem of integrating waste processing facilities (WRO) into the urban structure. The purpose of the work is to identify trends in the formation of WROs and formulate recommendations for including these objects in the context of the environment of St. Petersburg. As part of the research work in 2022, the Department of Architectural Design of SPbGASU carried out a comprehensive analysis of the sites proposed by the St. Petersburg Civil Aviation Committee for the placement of these objects. The general territorial requirements that impact the subsequent design of the WRO have been established. A systematic analysis of foreign experience in designing WROs has been carried out, and factors - internal and external - that affect the formation of the studied objects have been identified. It has been established that the solution of interrelations between internal and external factors leads to the organization of subordinate pairs of factors. The main trends in the creation of space-planning parameters of waste processing buildings are determined, taking into account the humanization of their appearance: the multifunctionality of the object, configuration options for the technological module, the influence of the environment on the shape of the object (imitation of the nature of the relief) and landscaping of facades. The obtained results are systematized and recommendations are given in the formation of WRO in the conditions of St. Petersburg: at the level of the general plan of the WRO, organization of the functional zoning of the object, comparison of the image of the building with the urban environment and / or landscape.","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75449832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-14DOI: 10.34031/2071-7318-2022-8-3-34-45
S. Kuznecov, N. Knyazeva
Currently, there is an active development of digital technologies in the construction sector. One of the main directions of digitalization of construction is the use of building information modeling technologies (BIM) at all stages of the life cycle of buildings and structures. The principle of using these technologies is the complex processing of geometric and attribute information about the object, its elements and its application to solve design, construction and operational tasks. The pace of BIM implementation at the operational stage is lagging behind, but the interest of asset owners is growing in the possibilities of reducing the complexity and improving the efficiency of building maintenance by organizing a centralized repository of up-to-date and reliable information about the object based on an information model. In this article, the operational formation of defect certificates and statements of necessary material and technical means intended for routine repairs is considered, as one of the directions of application of the information model for solving maintenance and repair tasks. The traditional approach to working with these documents is associated with the repeated entry of repetitive information into data accounting systems, and sometimes with handwritten forms and the lack of the possibility of simultaneous work of all participants on documentation. The proposed approach to electronic reporting will make it possible to reduce the amount of routine work of the maintenance service specialists and eliminate errors related to the human factor in the preparation of reports.
{"title":"APPLICATION OF BIM-TECHNOLOGIES TO SOLVE THE PROBLEMS OF MAINTENANCE AND REPAIR OF BUILDINGS AND STRUCTURIES","authors":"S. Kuznecov, N. Knyazeva","doi":"10.34031/2071-7318-2022-8-3-34-45","DOIUrl":"https://doi.org/10.34031/2071-7318-2022-8-3-34-45","url":null,"abstract":"Currently, there is an active development of digital technologies in the construction sector. One of the main directions of digitalization of construction is the use of building information modeling technologies (BIM) at all stages of the life cycle of buildings and structures. The principle of using these technologies is the complex processing of geometric and attribute information about the object, its elements and its application to solve design, construction and operational tasks. The pace of BIM implementation at the operational stage is lagging behind, but the interest of asset owners is growing in the possibilities of reducing the complexity and improving the efficiency of building maintenance by organizing a centralized repository of up-to-date and reliable information about the object based on an information model. In this article, the operational formation of defect certificates and statements of necessary material and technical means intended for routine repairs is considered, as one of the directions of application of the information model for solving maintenance and repair tasks. The traditional approach to working with these documents is associated with the repeated entry of repetitive information into data accounting systems, and sometimes with handwritten forms and the lack of the possibility of simultaneous work of all participants on documentation. The proposed approach to electronic reporting will make it possible to reduce the amount of routine work of the maintenance service specialists and eliminate errors related to the human factor in the preparation of reports.","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84975059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-14DOI: 10.34031/2071-7318-2022-8-3-122-133
A. Hurtasenko, K. Chuev, L. Rybak, V. Skitova
This article discusses and analyzes mechanisms based on the principles of parallel kinematics, designed to perform various technological actions, with the movement of the executive body along complex spatial trajectories. Mechanisms with parallel structures have wide possibilities for solving various problems of application of equipment and technologies. Promising are the tasks associated with the use of mobile bases in various simulators to gain skills in controlling equipment (aircraft, cars, specialized military equipment). To conduct research on kinematic and dynamic characteristics, a digital layout of the platform has been developed – a parameterized 3D model in a CAD system. The platform represents a system with six degrees of mobility, which are implemented on the basis of a mechanism with a parallel structure. A description of a dynamic simulation model with six degrees of mobility developed using the MSC Adams software environment is given. The model is intended for research at the stage of design work in the development of simulators of various vehicles. The developed dynamic model was tested in order to implement a methodology for conducting research on the kinematic and dynamic characteristics of the platform based on simulation modeling. The results determining the capabilities of the model for determining the dynamic and force parameters in individual elements of the platform at the specified geometric parameters of the platform design are presented. The methodology of studying the digital layout of the platform by simulation modeling consisted in the execution of the accepted trajectories by the model, taking into account the technical characteristics of the actuators. At the same time, certain dynamic indicators were recorded and processed. As a result, graphs of changes in velocities and accelerations of the center of mass, as well as force characteristics (the sum of forces applied to the body in the hinge) when performing the corresponding trajectories are constructed.
{"title":"DYNAMIC MODEL OF A PLATFORM WITH 6 DEGREES OF MOBILITY","authors":"A. Hurtasenko, K. Chuev, L. Rybak, V. Skitova","doi":"10.34031/2071-7318-2022-8-3-122-133","DOIUrl":"https://doi.org/10.34031/2071-7318-2022-8-3-122-133","url":null,"abstract":"This article discusses and analyzes mechanisms based on the principles of parallel kinematics, designed to perform various technological actions, with the movement of the executive body along complex spatial trajectories. Mechanisms with parallel structures have wide possibilities for solving various problems of application of equipment and technologies. Promising are the tasks associated with the use of mobile bases in various simulators to gain skills in controlling equipment (aircraft, cars, specialized military equipment). To conduct research on kinematic and dynamic characteristics, a digital layout of the platform has been developed – a parameterized 3D model in a CAD system. The platform represents a system with six degrees of mobility, which are implemented on the basis of a mechanism with a parallel structure. A description of a dynamic simulation model with six degrees of mobility developed using the MSC Adams software environment is given. The model is intended for research at the stage of design work in the development of simulators of various vehicles. The developed dynamic model was tested in order to implement a methodology for conducting research on the kinematic and dynamic characteristics of the platform based on simulation modeling. The results determining the capabilities of the model for determining the dynamic and force parameters in individual elements of the platform at the specified geometric parameters of the platform design are presented. The methodology of studying the digital layout of the platform by simulation modeling consisted in the execution of the accepted trajectories by the model, taking into account the technical characteristics of the actuators. At the same time, certain dynamic indicators were recorded and processed. As a result, graphs of changes in velocities and accelerations of the center of mass, as well as force characteristics (the sum of forces applied to the body in the hinge) when performing the corresponding trajectories are constructed.","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87227490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-14DOI: 10.34031/2071-7318-2022-8-3-134-144
K. Romanenko, A. Polyakov, I. Nikitina
The results of computer modeling of thermal processes in the machine for the formation of a bell in pol-ypropylene tubes are presented. A feature of the providing machine is the presence of two working zones. In the first zone, polypropylene tubes are heated, and their plastic deforming is performed in the second zone. In each zone, individual thermal models are implemented in transient in the start. Two problems were solved in the warm -up zone. The solution of the first problem allowed the dumping-pouring algorithm for the heating of the heating elements used to ensure the trendy temperature of the deformable section of the tube. The solution of the second problem made it possible to determine the emerging temperature extensions of both the heated section of the tube and the expansion of the internal and outer furnaces for two sizes of the tubes. In the plastic deformation zone, the results of computer modeling for two models are also presented. The first model considered the supply of cooling water into stamps and a mandrel. In the second model, on the contrary, the option of warming up stamps and mandrel was investigated. A feature of the proposed thermal models in the warm-up zone is the use of a conditional solid-state environment with combined air characteristics and deformable material in the elastic region. A feature of the used thermal models in the zone of plastic deformation of the tube was the task of the boundary and initial conditions in the form of fixed temperatures. The obtained modeling results were confirmed experimentally on the manufactured machine.
{"title":"FEATURES OF THE FLOW OF THERMAL PROCESSES IN THE MACHINE FOR BELL FORMATION IN POLYPROPYLENE TUBES","authors":"K. Romanenko, A. Polyakov, I. Nikitina","doi":"10.34031/2071-7318-2022-8-3-134-144","DOIUrl":"https://doi.org/10.34031/2071-7318-2022-8-3-134-144","url":null,"abstract":"The results of computer modeling of thermal processes in the machine for the formation of a bell in pol-ypropylene tubes are presented. A feature of the providing machine is the presence of two working zones. In the first zone, polypropylene tubes are heated, and their plastic deforming is performed in the second zone. In each zone, individual thermal models are implemented in transient in the start. Two problems were solved in the warm -up zone. The solution of the first problem allowed the dumping-pouring algorithm for the heating of the heating elements used to ensure the trendy temperature of the deformable section of the tube. The solution of the second problem made it possible to determine the emerging temperature extensions of both the heated section of the tube and the expansion of the internal and outer furnaces for two sizes of the tubes. In the plastic deformation zone, the results of computer modeling for two models are also presented. The first model considered the supply of cooling water into stamps and a mandrel. In the second model, on the contrary, the option of warming up stamps and mandrel was investigated. A feature of the proposed thermal models in the warm-up zone is the use of a conditional solid-state environment with combined air characteristics and deformable material in the elastic region. A feature of the used thermal models in the zone of plastic deformation of the tube was the task of the boundary and initial conditions in the form of fixed temperatures. The obtained modeling results were confirmed experimentally on the manufactured machine.","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78548261","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-14DOI: 10.34031/2071-7318-2022-8-3-19-33
N. Onoprienko, O. Sal'nikova
The article provides an overview of research on the specifics of the use and composition of restoration materials and solutions at different stages of the work. The need is shown for the development of domestic restoration materials that improve the quality of restoration, the long-term preservation of the restored object during operation and provide the possibility of choice in relation to each restoration task. The literature review gives the stages of restoration work of architectural monuments are given, the specifics of which depend on the use of functional additives in various repair mixtures. The review of research on the subject is focused on the importance of solving the problems of replacing imported modifier additives with domestic ones. The authors emphasize that the choice of additives of various functional purposes in prescription formulations should be made considering the compatibility patterns of the components of the materials being restored (including in the form of dry restoration mixtures), have a scientific integrated approach. The analysis of scientific achievements and publications where the solution of this problem has been initiated has shown that there are particular unresolved issues of the general problem to which this article is devoted. Polymer additives of domestic production of various chemical nature used in compositions based on mineral binders are given. Based on the analysis of physico-mechanical, rheotechnological and technological properties of compositions based on mineral binders, the possibility and advantage of using Russian water-soluble polymers in the compositions of restoration materials, taking into account the small dosage and environmental friendliness of these additives, is proved. Previous comparative analysis of conducted studies shows that increasing the range of modifying additives using Russian-made polymers and the production of competitively capable dry building mixes based on them for restoration operations will help to fulfill the task of preserving architectural objects of historical construction that reflect different epochs, an element of national culture and identity, ensuring the continuity of cultures.
{"title":"ON THE ISSUE OF DEVELOPING DOMESTIC RESTORATION MATERIALS FOR ARCHITECTURAL MONUMENTS","authors":"N. Onoprienko, O. Sal'nikova","doi":"10.34031/2071-7318-2022-8-3-19-33","DOIUrl":"https://doi.org/10.34031/2071-7318-2022-8-3-19-33","url":null,"abstract":"The article provides an overview of research on the specifics of the use and composition of restoration materials and solutions at different stages of the work. The need is shown for the development of domestic restoration materials that improve the quality of restoration, the long-term preservation of the restored object during operation and provide the possibility of choice in relation to each restoration task. The literature review gives the stages of restoration work of architectural monuments are given, the specifics of which depend on the use of functional additives in various repair mixtures. The review of research on the subject is focused on the importance of solving the problems of replacing imported modifier additives with domestic ones. The authors emphasize that the choice of additives of various functional purposes in prescription formulations should be made considering the compatibility patterns of the components of the materials being restored (including in the form of dry restoration mixtures), have a scientific integrated approach. The analysis of scientific achievements and publications where the solution of this problem has been initiated has shown that there are particular unresolved issues of the general problem to which this article is devoted. Polymer additives of domestic production of various chemical nature used in compositions based on mineral binders are given. Based on the analysis of physico-mechanical, rheotechnological and technological properties of compositions based on mineral binders, the possibility and advantage of using Russian water-soluble polymers in the compositions of restoration materials, taking into account the small dosage and environmental friendliness of these additives, is proved. Previous comparative analysis of conducted studies shows that increasing the range of modifying additives using Russian-made polymers and the production of competitively capable dry building mixes based on them for restoration operations will help to fulfill the task of preserving architectural objects of historical construction that reflect different epochs, an element of national culture and identity, ensuring the continuity of cultures.","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89399846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-14DOI: 10.34031/2071-7318-2022-8-3-56-66
A. Timofeev
Thermosiphon (TC) is an evaporative-condensing heat exchange device, where the circulation of the working fluid (intermediate coolant) is carried out due to gravitational forces. There is no porous wick in thermosiphons, it is replaced by grooves of various geometric shapes. Structurally, thermosiphons are made in the form of hermetically sealed and elongated cylindrical vessels, the inner volume of which is filled with a working fluid. Liquid heat carriers are used as the working fluid, which can perform an aggregate-phase transition at operating temperatures observed during operation in a recuperative heat exchanger. In this article, author is talking about comparing the limits of thermal power of thermosiphons operating at operating temperatures of ventilation and air conditioning systems. At the same time, thermosiphons use freons R134a, R410a, R407c as the working medium, and the capillary structure of thermosiphons is represented in the form of grooves of the following types: a Ω –shaped groove, a rectangular groove and a triangular groove. For comparison, a thermosiphon with an outer diameter of 8 mm is used. The dependences of the thermal power on the operating temperature for all types of limitations of the heat transfer capacity of thermosiphons are presented, depending on the capillary structure used and the working fluid. The analysis of the best capillary structure of thermosiphons when using freons as a working body is carried out.
{"title":"INVESTIGATION OF THE INFLUENCE OF THE CAPILLARY STRUCTURE OF A THERMOSIPHON ON ITS THERMAL POWER WITH HEAT CARRIERS R134a, R410a, R407c","authors":"A. Timofeev","doi":"10.34031/2071-7318-2022-8-3-56-66","DOIUrl":"https://doi.org/10.34031/2071-7318-2022-8-3-56-66","url":null,"abstract":"Thermosiphon (TC) is an evaporative-condensing heat exchange device, where the circulation of the working fluid (intermediate coolant) is carried out due to gravitational forces. There is no porous wick in thermosiphons, it is replaced by grooves of various geometric shapes. Structurally, thermosiphons are made in the form of hermetically sealed and elongated cylindrical vessels, the inner volume of which is filled with a working fluid. Liquid heat carriers are used as the working fluid, which can perform an aggregate-phase transition at operating temperatures observed during operation in a recuperative heat exchanger. In this article, author is talking about comparing the limits of thermal power of thermosiphons operating at operating temperatures of ventilation and air conditioning systems. At the same time, thermosiphons use freons R134a, R410a, R407c as the working medium, and the capillary structure of thermosiphons is represented in the form of grooves of the following types: a Ω –shaped groove, a rectangular groove and a triangular groove. For comparison, a thermosiphon with an outer diameter of 8 mm is used. The dependences of the thermal power on the operating temperature for all types of limitations of the heat transfer capacity of thermosiphons are presented, depending on the capillary structure used and the working fluid. The analysis of the best capillary structure of thermosiphons when using freons as a working body is carried out.","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86717647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-03-14DOI: 10.34031/2071-7318-2022-8-3-46-55
T. Il’ina, M. Kolesnikov, I. Kryukov, P. Orlov
The methods of organization ventilation in livestock complexes are considered. Using the example of a fattening housing for 200 heads of a pig breeding complex, the methods of organizing a mechanical supply and exhaust and natural ventilation system are shown. For this housing, the performance of the ventilation system is calculated by excess moisture and by the content of carbon dioxide in the room. It is established that it is advisable to produce the performance of the ventilation system according to the values of excess moisture, which meets the requirements of the zoo-hygienic standard. The calculation of the multiplicity of air exchange in the animal housing is made, which is 1.5 times and corresponds to the normative design indicators for pig farms. An aerodynamic calculation of the supply and exhaust ventilation systems is made, the number of supply and exhaust ducts for each system is determined, respectively. To visualize the process of air supply and distribution in the SolidWorks program, a model of air flows is built during the operation of a natural and supply and exhaust ventilation system for three cases when the outside air temperature is -20; 0; +20 ° C. It is shown that in warm and cold periods of the year it is advisable to supply prepared air through distribution channels of supply ventilation. To achieve the required parameters of the indoor air in the pig complex, it is proposed to prepare the supply air in the mechanical ventilation system using an air heat pump with the MOVEBIT anti-icing system.
{"title":"ABOUT THE WAYS OF ENSURING VENTILATION IN WORKSHOPS LIVESTOCK COMPLEXES","authors":"T. Il’ina, M. Kolesnikov, I. Kryukov, P. Orlov","doi":"10.34031/2071-7318-2022-8-3-46-55","DOIUrl":"https://doi.org/10.34031/2071-7318-2022-8-3-46-55","url":null,"abstract":"The methods of organization ventilation in livestock complexes are considered. Using the example of a fattening housing for 200 heads of a pig breeding complex, the methods of organizing a mechanical supply and exhaust and natural ventilation system are shown. For this housing, the performance of the ventilation system is calculated by excess moisture and by the content of carbon dioxide in the room. It is established that it is advisable to produce the performance of the ventilation system according to the values of excess moisture, which meets the requirements of the zoo-hygienic standard. The calculation of the multiplicity of air exchange in the animal housing is made, which is 1.5 times and corresponds to the normative design indicators for pig farms. An aerodynamic calculation of the supply and exhaust ventilation systems is made, the number of supply and exhaust ducts for each system is determined, respectively. To visualize the process of air supply and distribution in the SolidWorks program, a model of air flows is built during the operation of a natural and supply and exhaust ventilation system for three cases when the outside air temperature is -20; 0; +20 ° C. It is shown that in warm and cold periods of the year it is advisable to supply prepared air through distribution channels of supply ventilation. To achieve the required parameters of the indoor air in the pig complex, it is proposed to prepare the supply air in the mechanical ventilation system using an air heat pump with the MOVEBIT anti-icing system.","PeriodicalId":9367,"journal":{"name":"Bulletin of Belgorod State Technological University named after. V. G. Shukhov","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77325573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：