Compaction is one of the most important technological processes in in the asphalt (AC) pavement construction. Joint management of asphalt pavers and several rollers, allowing each roller to seal the road layer most efficiently with optimal compaction modes to ensure the required compaction quality, is an unsolved problem. To solve this problem, on the basis of modern achievements of scientific and technological progress, a cyberphysical system is proposed as an organizational and technical concept of information flow management. The structure of the system for monitoring and controlling the compaction of AC mixtures with a set of pavers – road rollers is proposed. The development of a cyberphysical road construction system makes it possible, based on digitalization, to effectively manage several road vehicles on the construction sites of road transport infrastructure projects for joint and adaptive compaction.

Keywords: compaction of asphalt mixtures, real-time quality control, road vehicles, cyber-physical system, control system

The article presents the development trends of prefabricated-monolithic frame systems (PMFS) in the countries of East Asia, mainly China and Japan. The presented PMFS have different features in comparison with technologies used in European countries and the USA, which are dictated by several factors: geographical features, high population density and uneven distribution in the territory, the continuing need accelerate of construction rates. Based on the analysis results of open information sources there were singled out 4 bearing framework formation systems , actively used by the large construction companies. The presented systems combine structural and technological solutions of modular, hybrid and prefabricated-monolithic construction. The use of bearing structures joints which makes it possible to erect buildings with a high class seismic resistance at a significant number of storeys is considered in detail. In the conclusion, the main features of the Asian PMFS, which have no analogues among the other systems, have been summarized. The results obtained can be used as basis for further larger and more effective development of the civil prefabricated-monolithic buildings.

Keywords: civil construction, prefabricated-monolithic construction, modular, hybrid, structural parameters, load-bearing structures, analysis, comparison, advantages, disadvantages

The article considers the possibility of replacing a monolithic frame with a precast-monolithic frame during the construction of a residential apartment building. The variety of structural systems erected in the Russian Federation for residential and public buildings is given. The positive and negative aspects of each of the proposed methods are considered. An economic justification for replacing a monolithic frame with a precast-monolithic one is given. Based on the results obtained, conclusions were drawn about the effectiveness of the use of prefabricated monolithic systems for the construction of civil buildings.

Keywords: construction, construction technology, monolithic frame, prefabricated monolithic frame, prefabricated structures, construction period, construction cost

The article provides an overview of the applied digital technologies in construction, the problems of their development.

Keywords: digital technologies, BIM model, 3D printing of buildings, construction production, estimate, 3D scanning

The paper is focused on the building heightening technologies employing modular structures, and in particular, three-dimensional units. It lists the global leaders in the field of manufacturing of three-dimensional/modular units and examines the work stages based on the analysis of scientific publications and patent searches. It is noted that the process arrangement upgraded to the current state of the art and the improved energy efficiency performance of a superstructure are mainly achieved through the use of modular units with greater dimensions but with a lighter weight.

Keywords: reconstruction, technology, energy efficiency, superstructure, modular constructions, volume blocks, organizational and technological solutions

This paper is a follow-up on the first part, which also reviews the process arrangement solutions for building reconstruction based on building heightening using modular structures. It highlights the importance of the use of transformer (stacked) modules, which allows improving the work process flexibility at the installation and transportation stages. It is further specified that, if reconstruction is carried out in congested urban environments, three-dimensional/modular units should be prefabricated, as prefabrication helps to significantly reduce a gap between the actual and standardized work timelines, even in case of force majeure.

Keywords: superstructure, organizational and technological solutions, transforming three-dimensional blocks, assembly and transport manufacturability

Abstract: The analysis of the implementation of the program "100 Gubernatorial investment projects" of the Rostov region in the pre-pandemic, pandemic and post-pandemic periods is carried out. The anti-crisis measures of the Government of the Russian Federation during the coronavirus pandemic are presented and their role in overcoming the consequences of the pandemic in various segments of the construction of the Rostov region is noted.

Keywords: Keywords: governor's investment projects, pandemic, anti-crisis measures, construction, capital investments, jobs

This article is devoted to the issue of the use of geosynthetic materials in drainage structures that can be used at oil and gas fields. In connection with the development of construction and building materials in the world, there is a need to apply technologies and solutions aimed at optimizing and reducing the cost of construction work, facility operation. The article presents block diagrams for the classification of geosynthetic materials according to various parameters. The issues of the use of geosynthetics and their functions in construction, in particular in drainage structures of oil and gas fields, are considered. The analysis of the regulatory and technical base within the framework of the study was made, the regulatory documents under consideration. The study of this topic makes it possible to determine the set of properties and functions required for geosynthetics, as well as to establish the most effective drainage structures using geosynthetics using the method of technical and economic comparison, which can be used in a real object.

Keywords: geosynthetic material, drainage structure, dewatering, groundwater, oil and gas field

The paper discusses specific reasons for strengthening footings and reinforcing foundations and explores the principal technologies for installing auger cast piles used for reconstruction of building systems. In order to identify the key benefits of using auger cast piles, the existing technologies are analyzed based on the study of domestic and foreign patents. The main principles are set out underlying an economically sound, technically and technologically justified choice of foundation reinforcement technology.

Keywords: reconstruction, bearing capacity, strengthening, reinforcement, piles, anchors, patent search, drawbacks and benefits

Currently, the estimated (marginal) cost of construction is calculated using aggregated construction price standards. Since the objects on the basis of which the collections of enlarged construction price standards were formed were calculated using the basic-index method, the standards do not reflect the real cost due to an imbalance between the standards and real prices. To solve this problem, it is proposed to form a database of completed projects that were built using information modeling technologies, and the estimated cost was calculated using the resource method. As it is filled, this database can become the main tool for determining the estimated cost of construction or the basis for updating collections of aggregated construction price standards.

Keywords: aggregated construction price standard, basic-index method, resource method, information modeling technologies, digital information model, database

The paper proposes and calculates a scheme of a two-stage gas turbine plant using carbon dioxide as a working fluid in the second stage and using heating of the CO2 circuit, as well as heating water sent for heating. As a result, the following were calculated: for the first stage turbine: parameters of fuel combustion products; air compressor parameters; fuel compressor parameters; combustion chamber parameters for a real Brayton cycle; Efficiency of the first stage turbine; for the second stage of the gas turbine: a schematic diagram was drawn up using liquid CO2 as a working fluid; calculation of CO2 parameters at key points of the Brayton cycle; the efficiency of the turbine of the second stage is calculated.

Keywords: energy efficiency, gas turbine plant, carbon dioxide, pressure, pressure ratio, combustion chamber, recuperator

The stage of operation of a highway is one of the most important stages of its life cycle. The decisions made at this stage have a direct impact on the durability of the road, the safety and transport costs of its users. Optimization of the decisions made is an urgent task that requires a comprehensive consideration of both the technical and economic components. Within the framework of this work, using the algorithms of artificial neural networks (ANN), a mathematical model of the ANN was developed to determine the integral level of pavement safety, based on a complex of structural and operational factors, including the modulus of elasticity of pavement layers, longitudinal evenness, rutting, and the presence of fatigue failures. On the basis of the integral level of pavement safety, its operational condition is predicted, a scale is assigned for the selection of control actions to ensure its required durability.

Keywords: artificial neural networks, integral safety level, falling weight deflectometer, road maintenance, road life cycle management

Studies of the possibilities of BIM modeling in the field of ventilation systems design show that the current level of development of BIM technologies allows for aerodynamic calculation. An example of software with such capabilities is Autodesk Revit. This article provides a comparative analysis of two calculation methods: according to the standard methodology and the Colebrook formula, calculated on Revit software. The calculation error was 14.08%, which does not exceed the permissible value of 15%. Thus, the prospects of using the Revit program to perform aerodynamic calculations are shown.

Keywords: BIM-modeling, ventilation systems, 3D design, Autodesk Revit, aerodynamic calculation, BIM-technologies, information modeling

The article is devoted to the problem of assessing the safety of buildings affected by natural and man-made accidents and disasters. Within the framework of the work, the stages of assessing the safety of buildings affected by natural and man-made accidents and disasters are presented; measures of a technical and organizational nature were proposed to improve the quality of the assessment of the technical condition and safety of capital construction projects; the main directions for solving the problem of timely organization of the process of assessing the technical condition and safety of buildings affected by natural and man-made emergencies are considered.

Keywords: building safety assessment, natural disaster, man-made accident, man-made disaster, restoration work, emergencies

Numerous factors that determine the quality of monolithic reinforced concrete massive foundations predetermine the relevance of a thorough study of a set of issues related to the intensity of concreting, the technical capabilities of the contractor, temperature and humidity conditions, the characteristics of the technological properties of the concrete mixture and the kinetics of concrete hardening. To ensure the solidity of the structure, the expediency of determining the thickness of the layer to be laid is justified not only by the length of the working part of the vibrator, as prescribed by the standards, but also by the indicators of the intensity of concreting, determined by the design parameters, temperature and humidity conditions and the capabilities of the worker. The influence of the temperature and humidity conditions of the environment and the recipe features of the concrete mixture on the rational time of overlapping layers is shown. The results of modeling the level of tensile stresses on such recipe-technological factors as the class and kinetics of concrete hardening, temperature conditions and conditions of heat exchange with the environment are given on the example of a temperature-shrinkage block 20x20x2 m. the values ​​of its parameters. An equation is given for relative moisture loss over the thickness of the structure in dry hot weather when self-compacting concrete mixtures are used.

Keywords: intensity of concreting, quality of massive monolithic foundations, overlapping time of layers, moisture loss, level of tensile stresses

The open labor market has contributed to the emergence of new forms of employment for workers due to the recognition of remote work as one of the forms of organization of production and labor, including in the organization of construction production. With the massive penetration of digital technologies into the business models of modern companies, employers are increasingly turning to freelancers. This transition was associated with the development of the Internet, the emergence of online platforms and cloud data storages that connect customers and contractors and allow the employee to carry out labor activities regardless of the territorial location. Such transformations have formed a new socio-economic model, called "gignomics". Today, gigonomics is developing at a rapid pace throughout the world, as this model is attractive to both workers and employers.

Keywords: gigonomics, remote work, remote work, organization of construction industry, digital transformation, digitalization, non-standard forms of employment

In connection with the development of computational complexes of the finite element method, sometimes there is a problem of choosing methods and techniques for numerical experiments with the lining of interlinear subway tunnels. The aim of this article is to consider the possibility of using one-dimensional and two-dimensional elements in modeling the lining of an underpass tunnel and the necessity of using contact elements in modeling the lining. In order to fulfill this task, two computational schemes with the lining modeled by one-dimensional elements and by two-dimensional elements have been created using the example of the existing Moscow Metro tunnel.

Keywords: finite element method, one-dimensional elements, two-dimensional elements, contact element, contact problems, tunnel, metro, mathematical modeling, stress-strain state

The relevance of modeling the temperature regime and the stress-strain state in the early period of the construction of massive monolithic reinforced concrete structures is shown. Some data are given on the temperature and time parameters of the formation of temperature fields in structures with a surface modulus from less than 1.1 to 2.4 from concrete classes from B25 to B70, both fast and slowly hardening. Based on the results of processing numerous data, the quantitative values ​​of the parameters of the heat release kinetics for the proposed dependence are substantiated. A simplified method for calculating thermal stresses is proposed, based on the proposed and substantiated dependences of concrete properties on its degree of maturity, which are confirmed by numerous experimental data, incl. obtained by other researchers. The calculated values ​​of stresses obtained during the construction of a temperature-shrinkage block 20x20x2 m from concrete of fast and slow hardening classes B25 and B45 were compared with some experimental results and modeling data. The conclusion is made about the inexpediency of using concrete of class B45 due to the high risk of cracking in the period of 1.5 - 3 days. When using concrete of class B25, preference should be given to fast-hardening.

Keywords: massive monolithic structures, thermal stresses, cracking, degree of concrete maturity, kinetics

The article considers the problem of information support of constructing, namely, organization of dispatch service within constructing main pipelines. This aspect of organization of construction was chosen as an object of research due to the problem of increasing efficiency in the process of quality control of the construction of main pipelines. The article describes such dispatching problems as minimal distribution of software for construction control, coordination of dispatcher functions within the framework of one department, as well as clearly defined responsibility of builders for the poor quality of information provided. The author proposes to introduce delegation of authority of the dispatching service to all departments of the enterprise within their competence. In the future, this should provide a quick response to the negative consequences that develop during the construction period in all aspects, including quality control.

Keywords: dispatching service; main gas pipeline; information flows, executive documentation; delegation; automation; building information modeling

CLT panels (English: Cross Laminated Timber) were chosen as the object of the study. This is a multilayer material made of coniferous and hard-leaved wood, which has a system of cross—glued wood in its composition. As part of the work, the available literature on this topic was analyzed, the calculation and analysis of the results obtained were carried out. The article presents the results of the calculation of the CLT panel with consideration of the possibility of isotropic and orthotropic setting of the stiffness of the panel, using elastic modules along and across the fibers. The calculation results are presented in the form of maximum deflections of the panel. Applications in the calculation of the modulus of elasticity across the fibers and taking into account orthotropic stiffness clarifies the stress-strain state of the overlap panel. Based on the calculations performed and the analysis of the results obtained, conclusions are drawn.

Keywords: CLT-panel, transverse bending, modulus of elasticity, stiffness, stress, deflection, orthotropy

Due to the increasing pace of construction and overhaul of roads, there is a need to introduce more economical and efficient technologies. One of such technologies is soil stabilization. Based on the study of various scientific literature and project documentation, typical soils of the foundation and roadbed of the Kirov region have been established, and their features have been identified. During the study of the soils of the region, several dangerous geological processes were discovered that affect the operation and construction of roads. The article analyzes various methods and techniques of stabilization of heaving soils, as well as possible design solutions for the construction of a layer of modified soil. In addition, the mechanisms by which stabilization is carried out and cases of their application were given. In the course of the study, the main types of stabilizing additives, their features and principle of operation were considered. In order to identify the degree of influence of various binders on the technological sequence of construction, variants of schemes for the production of work on soil reinforcement are presented, depending on their types. According to the results of the study, it was concluded that the stabilization technology is one of the most modern, efficient and cost-effective and provides various advantages in comparison with other alternative methods of strengthening of heaving soils. The relevance of this method for the Kirov region is also proved.

Keywords: road, construction, technology, stabilization, soils, additives, recycler, binders, soil cement, heaving, strengthening

The expediency of using modeling using the finite element method to study the influence of certain prescription-technological factors on the resulting temperature fields and temperature stresses during the construction of massive foundation slabs is substantiated. A simplified method for determining thermal stresses based on the reduction of a three-dimensional problem to a one-dimensional one based on the hypothesis of flat sections is considered. The dependence is proposed and the quantitative values ​​of the parameters for calculating the kinetics of heat release of concrete in the temperature-shrinkage block are substantiated. As a result of the implementation of a numerical experiment on the influence of the duration of breaks between overlapping layers, the temperature of the environment and the concrete mixture, the class and kinetics of concrete hardening, and heat transfer parameters, the dependences of the level of tensile stresses on these factors over time were obtained. It is shown that when developing technological regulations for concreting, the determination of technological parameters (the intensity of laying the mixture, the thermal resistance of the formwork, the arrangement of working joints, etc.) is impossible without taking into account the kinetics of concrete hardening, determined by the prescription features of concrete mixtures.

Keywords: massive monolithic structures, temperature fields and stresses, prescription-technological factors, heat release of concrete, stress-strain state

During operation, the pipeline is threatened by various geological hazards, especially in regions with permafrost, where freeze-thaw disasters have a significant impact on the integrity and safety of oil and gas pipelines. Therefore, at the design and construction stage, it is advisable to analyze various methods of laying pipelines, taking into account the topographic environmental conditions, as well as the effect of frost rise and thaw on the soil of the pipeline foundation. An analysis of the existing design schemes for the construction of pipelines, the conditions for passing the route of the projected pipeline, the characteristics of the pumped hydrocarbons makes it possible to justify the choice of a construction method that can ensure the stable position of the oil and gas pipeline both during the construction period and during its operation.

Keywords: hydrocarbons, analysis, pipeline, construction methods, reliability of pipeline structure, permafrost soil, pile support

The article discusses various mechanisms of self-healing of concrete used in the construction of buildings and structures designed for certain operating conditions and the environment, which saves resources and time during maintenance and repair of objects for various purposes. Types of self-healing of concrete: With hollow fibers; Microcapsulation; Expanding additives; Bacteria. Conclusions. Today, progress has been made in understanding the relationship between the structure of materials and their properties. Thanks to the knowledge gained about the structure of materials, the possibility of designing materials of directional quality was considered, which guarantees their compliance with certain operating conditions and the environment.

Keywords: concrete, destruction, self-healing, hollow fibers, microcapsulation, expanding agent, bacteria

The main features and goals of energy efficiency in residential construction are considered in order to ensure minimal heat loss of buildings, and thus reduce the use of the required amount of energy to compensate for heat losses. With the increasing energy crisis and the deterioration of the environmental situation in large cities, recently foreign countries have attached importance to the rational use of energy resources. Facades are one of the main elements that provide a solution to improve the energy efficiency of the building itself, as they reduce the heat loss coefficient to a significant level. Today, Germany is a world leader in energy efficiency, as the country uses the most modern energy saving technologies. The technology of using energy-efficient facades in Europe is already considered normal and at the moment the technology of using a ventilated facade, translucent facade system, "green facade", dynamic facade represent more progressive solutions to improve energy efficiency.

Keywords: energy efficiency, heat loss, enclosing structures, facade, foreign experience, hinged ventilated facades, translucent facade system, green facade, dynamic façade