bluuebunny/crossref_metadata_2025_split huggingface dataset:
Biomodified building materials on the base of mineral binders
Authors: Bruyako Mikhail , Grigor’eva Aleksandra , Stepina Irina , Golotenko Darya , Podsevalova Anastasia 
Published: January 2021

Abstract
In order to increase the service life of structures, there should be taken various measures aimed at damaged elements restoration followed by their due maintenance. Enhancing material’s properties by the ability of self-healing is done with the help of the additive and is seen as the effective method of preservation of the materials’ properties. The analysis of the previous studies has shown that biological and biochemical processes are given preference to facilitate self-healing process. The purpose of the present study was a development of the method allowing for the increase in durability of buildings structures by activating and providing self-healing processes of building materials. The application of the developed bioadditive allows retaining reliability of construction products at the very initial stages of microflaws’ appearance by filling them up with the essential products of bacteria with urease activity. The bacteria are introduced into the body of the material at the manufacturing stage. This method of imparting a self-healing effect to the materials has many points in its favor such as sustainability, cost effective performance, and reduced labor costs for repair and restoration work. The method could be used in the structures of any complexity and for reconditioning of heritage sites. The selected microorganisms act upon the mix as surfactants, that is, they lower the water-cement ratio of sand-cement mortars by augmenting the concentration of bio-surfactants. This feature of cells enhances the efficiency of the developed additive. Application of these microorganisms as a component of a biologically active additive can significantly increase production performance and the efficiency of building structures’ operation due to higher efficiency of microorganisms responsible for initiating self-healing processes in building materials. According to the research results, zeolite could be regarded as the most suitable porous material acting as a carrier of cell immobilization.
Aerated concrete with predetermined pore parameters for the exterior walls of energy efficient buildings
Authors: Adilkhodjaev Anvar , Hasanov Bahriddin , Shaumarov Said , Kondrashchenko Valery 
Published: January 2021

Abstract
This article presents the results of theoretical and experimental studies on the development of aerated concrete with predetermined pore structure parameters. Investigations of the physical-mechanical and heat-engineering properties of external wall fences made of cellular concrete are given and the optimal parameters of the porosity of the material structure are established. The testing results were tested in the factory and the main properties of aerated concrete with an improved pore structure were determined.
Verification of the building materials production process mathematical model
Authors: Vasil’eva Olga 
Published: January 2021

Abstract
We consider a new mathematical model of the process of production of building materials based on the reaction of autocatalysis in the case of two reagents. The considered mathematical model takes into account the terms of a higher order of smallness for a small parameter. The results obtained when considering a reaction in an infinite cylinder with a random distribution of chemical reagents at the initial moment of time using two different mathematical models are compare.
Hardening of cutting tools by combined gas nitriding method
Authors: Eshkabilov Kh , Berdiyev Sh , Kamolov B 
Published: January 2021

Abstract
In order to improve the strength properties of cutting tools made of high-speed steels, the article presents the results of a study of the possibility of using a combined method of surface hardening, which consists in nitriding in an ammonia medium at the first stage and oxidizing the nitrided layer in water vapor at the second stage.
The formation of a thin dense oxide film consisting of a single magnetite and a dense nitride layer under it as well as a zone of internal nitriding following it are studied on the surface to be strengthened.
It is established that the combination of the process in the first stage by zaevtektoidnoj temperature for the system “Fe-N” the temperature intervals of martensite transformation of residual austenite and the second step by zaevtektoidnoj temperature for the system “Fe-O” according to temperature intervals and tempering after hardening allows you to get the diffusion nitride-oxide layer with the desired structures and properties on the surface of high-speed steel.
Physicochemical fundamentals of modifying concrete mix and concrete
Authors: Khasanov Bakhridin , Vatin Nikolai , Mirzaev Timur , Suyunov Abdugani , Radjabov Mirzokhid 
Published: January 2021

Abstract
It is possible to obtain highly efficient construction conglomerates by modifying the structure of cement stone and concrete. Consequently, modification of the concrete structure in this direction is intended to improve the technological properties of the material. By modifying, it is possible to change the kinetics of the growth of physical properties and the final values of the strength of concrete.
Without considering the physical and analytical mechanism for modifying the structure formation of concrete, we note that it is primarily aimed at reducing the amount of water -a mixture in a unit volume of material. However, various studies have proved that in the initial period, the structure formation of the cement stone develops in the optimal direction only at a certain volumetric water content. The limiting reduction in water content makes it difficult to hydrate the binder, limiting the final strength properties of the material. At the same time, the final strength properties of the material are improved with an all-round decrease in the volumetric water content of the mixture. In all cases, the modification of concrete assumes its composition is unchanged from the mixing of the mixture to the final stage of the formation of the concrete structure.
At present, only isolated attempts are known to physically modify concrete, for example, during its evacuation. In this case, the optimal amount of mixing water is introduced into the concrete mixture, which ensures the optimal flow of the binder hydration reaction. The subsequent suction of water, changing the initial composition of concrete, leads to a deep modification of its structure formation. In particular, the density of the material and its strength properties sharply increase. It should be noted that physical modification of concrete leads to a change in the nature of fixation of binder particles.
Optimization of the composition and technological processes of dispersed cement systems with high performance properties
Authors: Tkach Evgeniya , Semenov Vyacheslav , Shumilina Yulia 
Published: January 2021

Abstract
The technological parameters of obtaining cement disperse systems are considered. It is shown that the optimization of technological processes allows the development of dis-persed cement systems with high protective resistance during the operation of buildings and structures. It was determined that optimization of the parameters makes it possible to select the most effective ratio of cement and finely ground filler from concrete scrap, the optimal amount of modifier additives, and then the ratio of colloidal cement glue and sand (aggregate) in order to obtain mortar compositions for decorative coatings with high strength properties. It was found that grinding sand or crushed concrete scrap allows not only to increase their specific surface and obtain the required particle size distribution, but also to improve the surface quality of particles by removing and destroying surface inactive films, which increases the reactivity of the filler in various processes. Mechanical activation in combination with modifying additives allows to give the necessary properties to colloidal cement composites using optimal techno-logical parameters of processing. The influence of the particle size distribution of sand on the strength characteristics of decorative coatings based on colloidal cement glue is determined de-pends on the ratio of colloidal cement binder to sand. Studies have shown that the fractional characteristics of sand are optimal, in which dense packing of grains and approximately equal fractions of fractions are ensured. It has been established that dispersed cement systems with an optimal fractional composition of the filler have a water-holding capacity that significantly ex-ceeds the standard values.
Identification of a potential danger zone for industrial enterprises in the Far North
Authors: Lukyanova Yuliya , Lavrusevich Andrey 
Published: January 2021

Abstract
The accident on may 29, 2020 in Norilsk showed that the problem of permafrost melting is currently relevant for all industrial enterprises in the Arctic region. Soil thawing leads to deformation of objects located on territories with similar engineering and geological conditions. You can often see houses and roads riddled with small and large cracks, buildings with deformed foundations. All these are the results of the processes that control the life of permafrost. It is necessary to study and observe the processes of degradation of permafrost so that this phenomenon does not come as a surprise, in order to have time to take measures to prevent an accident. It is shown that the boundaries established by regulatory documents do not prevent the release of pollutants into the environment in the event of an accident at the facility. As a result, it is useless to establish a sanitary protection zone. Continuous monitoring of the state of permafrost in the area where industrial facilities are located can be a preventive measure.
The prospects of information technology using for the analysis of industrial buildings defects
Authors: Shilov Leonid , Evtushenko Sergey , Arkhipov Dmitrij , Shilova Liubov 
Published: January 2021

Abstract
The article discusses an approach to describing cracks using machine learning algorithms to simplify the issuance of defective statements for the reconstruction object. The presented approach makes it possible to describe the geometric characteristics of concrete structures and their defects by sets of equations in order to subsequently find the main characteristics of defects and enter them into the defect lists.
Construction Specifics of Oil Tanks with a Capacity of 20,000m3 on Large Strata of Collapsible Loess Soils
Authors: Abelev Mark , Chunyuk Dmitry , Kopteva Olga 
Published: January 2021

Abstract
The article presents experience in compaction of a large stratum of collapsible loess soils (type II collapsibility) during the construction of 4 metal tanks with a capacity of 20,000 m3.
On deformation criteria of a special limit state of eccentrically compressed elements of RC building frames
Authors: Savin Sergey , Manaenkov Ivan 
Published: January 2021

Abstract
At accidental impacts caused by the sudden removal of a load-bearing element of the building frame, the stress-strain state of the sections of eccentrically compressed structural elements such as columns, pylons, braces and belts of trusses, etc. becomes more disadvantageous than their stress-strain state at the stage of normal operation. The factors that lead to such a situation are sharp increase in the eccentricities of loads attaching, slenderness of cross sections, corrosion, initial curvature and mechanical damages. In these cases, buckling scenario for the exhaustion of their bearing capacity is a possible scenario. The paper proposes an approach to the obtaining of deformation criteria for assessing the special limiting state of eccentrically compressed bar elements of reinforced concrete frames. Such an approach is based on the use of a combination of nonlinear deformation analysis and nonlinear stability analysis. Paper shows that the limiting values of deformations for the considered reinforced concrete element can be determined by the criteria of strength or buckling, depending on the ratio of the forces acting in the sections of the structural element.
Strength of heavy concrete during static-dynamic deformation
Authors: Fedorova Nataliya , Medyankin Michael , Fedorov Sergey 
Published: January 2021

Abstract
Method and results of determination of strength and deformation characteristics of heavy concrete at static loading to the specified stress level, followed by high-speed loading with dynamic load, are presented. The process of testing a series of concrete samples of one strength class is described to obtain the performance characteristics of concrete at static, dynamic and static-dynamic loading. Comparative analysis of the obtained experimental data was carried out under different loading modes of prototypes. It was established that during dynamic and static-dynamic loading there is an increase in the level of relative stresses corresponding to the beginning of concrete dilatation by 20-30% relative to the results of static tests. The obtained experimental results are of interest for solving problems related to the problem of survivability of buildings and structures and their protection against progressive collapse, in particular in determining criteria of strength and deformability of concrete at a special limit state.
Final smoke spread simulations for Tunnel traffic & operation simulator
Authors: Danišovič Peter , Šrámek Juraj 
Published: January 2021

Abstract
Road and highwaz tunnels have become an essential part and an important element of the road network. In terms of general transportation and transit of goods they have also transnational significance. Tunnels located on the trans-European road network with a length of more than 500 m must also comply with the requirements of European Directive 2004/54/EC. That directive imposes an obligation on investors and management organizations to pay particular attention to the fire safety of tunnels. This paper describes final smoke spread simulations of road tunnel fires which were created as outputs of the project entitled “Models of formation and spread of fire to increase safety of road tunnels”.
Computation of the influence of the surcharge on the state of stress of the round plate on a bumping foundation
Authors: Atarov Nikolay 
Published: January 2021

Abstract
The problem of calculating a round plate located on the surface of a combined foundation is being considered in the paper. An analytical solution is deduced for a plate of finite stiffness and a stiff plate (round stamp) under the influence of an axisymmetric bending. The influence of an axially symmetric ring load applied to the surface of the base outside the slab is analyzed.
Automated assessment of information models for compliance with “green” standards
Authors: Makisha Elena , Rybakova Angelina 
Published: January 2021

AbstractIn modern construction, environmental issues are becoming increasingly important, therefore the concept of “green” construction gains growing popularity among both customers and developers. At the same time, information modeling technologies is witnessed to become widespread worldwide. This article reveals the design and construction of modern buildings in accordance with standards of “green” certification based on building information modeling methods. The advantages of building information models, such as rational design decisions, object analysis by various parameters, and quick access to quantitative and qualitative information provides easier certification of “green” buildings, and as a result, the efficient operation of the future object. The purpose of this research is to study the possibility of automated assessment of building information models for compliance with rating systems of “green” construction that can be achieved by analysis «green» construction aspects in the combination with information modeling, approaches to models evaluation within the framework of «green» certification standards and analysis of automated models verification methods. The practical result of the research will be an algorithm for automated evaluation of information models for compliance with” green” standards. Based on the theoretical part of the study, directions for further research in the field of sustainable construction based on BIM will be formulated.
Identification of the architecture in XXI century “Generation of Legacy Reborn from Innovations”
Authors: Aukhadiyeva Laura 
Published: January 2021

Abstract
Scientific discoveries based on innovative materials and technologies of the late XX and early XI centuries are the main sources of innovation in architecture. They made it possible for the architects to widen horizons of creativity and imagine the vision of a future world that was unattainable only a while ago. By studying the technique of “combination” of tradition and innovation in the creative works of Sir N. Forster (Great Britain), an architect with a world renown, and pioneering work of an architect A. Khan (Great Britain) and many others allow to look at the problem of regional identity of architecture under a reassuring vantage point where a blind spot – problems of keeping the identical architecture and its developmental trends – is uncovered in inseparable connection with the globalization processes.
Brief summary. Globalization and regionalization – two phases of world development having an impact on the development of world architecture where the method of “generation” of legacy does not constitute a template since the method of analysis and synthesis of science and art allows for the possibility of the widest range of innovation.
Integration of abandoned manor parks, that are cultural heritage sites, into an environment, that corresponds to the “smart city” concept
Authors: Pozhilova Anastasia , Leptuhova Olga 
Published: January 2021

Abstract
The paper is devoted to the possibility of urban development using manor parks, which are cultural heritage sites, to improve the quality of the built environment. To justify the type of their use, we propose a methodology based on the factors identified during the study that affect the type of use of manor parks, as well as on the analysis of existing similar, already optimally used manor parks and a sociological study of the needs of potential visitors. Using this method will help improve the quality of the built environment when implementing the “smart city” concept.
Reinforcement of reinforced concrete structures with composite materials
Authors: Khayrnasov Kamil 
Published: January 2021

Abstract
Composite materials are becoming more widespread in many areas of the national economy, including in construction, due to their high strength parameters with low weight characteristics. Currently, composite material is the most promising material in building. The use of composite materials in construction for the manufacture, reinforcement and repair of reinforced concrete structures facilitates their lightening, allows varying the physical and mechanical characteristics by positioning the composite base in the desired direction. Therefore, consideration of the issues of reinforcing floor slabs commonly used in construction with composite materials is an important and relevant topic. The use of composite materials in reinforced concrete elements provides increased crack resistance and stiffness of reinforced concrete elements. This is due to the localization and redistribution of deformations in the stretched zone.
Experimental and theoretical study of post-tensioned unbonded beams
Authors: Gavrilenko Alexey , Barkaya Temur 
Published: January 2021

Abstract
Paper contains data obtained during a bending test of four post-tensioned unbonded beams as well as description of geometry of test specimens and strength properties of used materials. Midspan deflection, tendon stress increase, cracking moment and ultimate bending moment were measured during the test. Crack propagation pattern was assessed as well. Ultimate bending moment, cracking moment and midspan deflection were then estimated using reinforced concrete analysis methods widespread in Russia. Comparison of the test data and calculation results shows that nowadays there are not domestic analysis methods well enough to fully estimate the unbonded post-tensioned beams.
Comparison of the impacts of harmonic and seismic waves on an underground pipeline during the Gazli earthquake
Authors: Kosimov Elbek , Mirzaev Ibrakhim , Bekmirzaev Diyorbek 
Published: January 2021

Abstract
The paper considers a class of problems of the dynamics of spatial systems of underground pipelines under the action of three-component seismic waves propagating in soil based on instrumental records of real earthquakes. A comparison was made of the impacts of harmonic and seismic waves on an underground pipeline during the Gazli earthquake. A graphical method for determining the dominant period to be used in calculations for harmonic impact was given.
Nonlinear analysis of constructions from different materials based on unified plastic constitutive relations
Authors: Panasyuk Mark , Petrakov Aleksandr , Petrakova Natalia 
Published: January 2021

Abstract
In the paper the plastic constitutive relations based on the hypotheses of the plastic flow theory, unified for different materials, such as soil ground, concrete, metal etc. are proposed. These plastic constitutive relations are based on the hypotheses of the Mises-Schleicher-Botkin theory of failure. The strength characteristics of materials, determined by standard methods, are redefined for octahedral sites, they are invariants for. The problem is solved by the finite element method (FEM). The calculation model MFOE made up of singular finite elements (tetrahedral, triangular plates, rods). This fact increases the accuracy of the description of loading paths in finite elements and ensures a unique correspondence of the constitutive equations to elementary volumes of the construction. The use of singular finite elements is associated with a large amount of access memory for storing the stiffness matrix of the system. So, the range of practically solvable problems limits significantly. To eliminate this contradiction, the Newton’s iteration method – SOR method is developed for equilibrium equations solving in the design of finite elements structures. An iterative algorithm is obtained. It does not require assembly of the system stiffness matrix for its implementation. The volume of operational information is proportional to the number of finite elements in the system. Due to the traditional approach, which requires the assembly of the system stiffness matrix, the amount of operational information is proportional to the square of the degree of kinematic indeterminacy of the system. While using the iterative algorithm, the size of the stiffness matrix and the time of solving are reduced. The results of a nonlinear analysis of soil massifs and concrete structures are represented.
Numerical analysis of the ultimate compressibility of concrete with indirect reinforcement for plotting a stress-strain diagram
Authors: Manaenkov Ivan , Savin Sergey 
Published: January 2021

Abstract
Indirect reinforcement is one of the effective ways to increase the strength and deformation characteristics, which is achieved by creating a volumetric stress state in concrete. For the design of reinforced concrete structures with indirect reinforcement, the calculation method based on a nonlinear deformation model is well suited. For such calculations, it is required to construct the stress-strain diagram, which will most accurately describe the relationship σ-ε. The article presents a numerical analysis of increasing the bearing capacity and deformations of concrete of various classes with indirect reinforcement in the form of welded meshes. Selected formulas to determine strength and ultimate compressibility. The problems arising in determining the compressibility limit of concrete with indirect reinforcement for engineering calculations are noted. Recommendations for calculating the parametric points of the stress-strain diagram are given.