The quality assessment of construction organisations is a scientific task, representing a practical interest for customers of capital construction projects, self-regulating associations of builders, as well as for the contractors themselves, interested in improving the quality of enterprise management. The study aims to develop a methodology for the integral quality assessment of a construction organisation. The quality of a construction organisation within the framework of this study is understood as the ability of a construction organisation to comply with the terms of a contract, produce construction products that meet the requirements of technical regulations and provide safe working conditions. In order to determine the quantitative value of the integral quality assessment of a construction organisation, a regression model was constructed describing the dependence of the construction organisation quality indicator on the effect of most significant factors, identified based on the results of expert assessments. Among the factors, having the most significant effect on the value of the integral quality assessment of a construction organisation, the authors identify the following: compliance with the terms of the contract for the duration and cost of creating a capital construction facility, compliance of construction products with the requirements of technical regulations, the share of workers with at least three years of experience in the organisation, as well as the number of accidents, recorded during the studied time. The regression model, proposed for the integral assessment, provides a fairly high level of reliability for the calculated values. The results of calculations can be used in the assessment of construction organisations by external participants in the investment and construction process, as well as by the management of contracting organisations in order to improve the management system.

The research topic is relevant due to the demonstrated principles of economic sovereignty within the economic development strategy of the Russian Federation and the implementation of new mechanisms of public administration. The study analyses government action under current recessional conditions focused on the management of the real estate of industrial associations and transport infrastructure. In the article, real estate assets within these sectors are collectively categorised as subjects in the public administration system, being closely connected and forming the basis for the economic security of the country. According to the authors, real estate should be considered a controlled and manageable resource, given its substantial monetary value. As an example of state management of this resource, the article examines the operations of federal services, along with the processes occurring in the automotive, aircraft manufacturing and transport infrastructure sectors. The article examines the assets of foreign automobile plants that departed due to sanctions, focusing on industrial facilities in major Russian cities. The measures of state support for the infrastructure of the automotive and aircraft industries in accordance with the strategies outlined by the Ministry of Industry and Trade are explored. The aircraft industry is studied in the context of the emergence of government orders and the operations of the public joint-stock company United Aircraft Corporation The transport industry is considered as an industry supported by the state through financing new infrastructure facilities and reconstruction of existing ones.

The accepted global trend of transition from a linear economy to a closed-loop one stimulated the development of regulatory documents, such as “Strategy for the development of building materials in the Russian Federation and Irkutsk Oblast”, Decree of the Government of the Russian Federation dated 08/02/2023 No. 2094, both at federal and regional levels. Further, the Baikal interregional scientific and educational centre was established. All this aims at obtaining technologies for developing effective building materials, based on technogenic wastes, and establishing the production. It is planned to obtain effective building materials, based on the accumulated high-tonnage waste of the Usolye-Sibirskoye priority development area, such as ash and slag mixtures of the combined heat and power plant (90 million tons) and lime-containing waste, generated during the production of acetylene at the Khimprom PJSC (more than nine million tons). The paper represents a fundamentally new approach to obtaining artificially synthesised newgrowths of cementless concrete, based on technogenic wastes, which meets the requirements of regulatory standards in terms of frost and water resistance and allows using this concrete in enclosing structures. At a rationally selected ratio between lime-containing wastes and an ash-slag mixture, subject to the pre-established principles of technological preparation in terms of their mechanical activation, mixing technology, conditions and synthesis duration, it is possible to obtain high-quality cementless concrete that meets the basic requirements of regulatory documents for quality indicators.

A mathematical model was developed to describe the efficiency of air regeneration used for immobilised biofilm on free-floating biocarriers “FB Bio-850”. For this purpose, a physical model of an aeration tank bioreactor was developed, forming the basis for this study. The use of biocarriers contributes to decreasing the concentration of water pollutants that pose a threat to humans and the environment when released into the surface or groundwater without adequate treatment. This increases the efficiency of the aeration tanks, accelerates the oxidation of pollutants and ensures high-quality water purification. In addition, biocarriers increase the performance of the biological treatment plant, promote the resilience of biological structures to abrupt discharges of pollutants and facilitate the nitrification process. Carrying out such studies on an industrial aerated facility poses significant technical challenges. The model aerated tank and the experimental setup provided the flexibility to vary the intensity of the air medium-bubble regeneration for free-floating biocarriers, regeneration time, and the specific gravity of the biocarriers across a broad range, along with controlling the concentration of free-floating sludge. The correlation between the efficiency of regeneration of the plastic carriers “FB Bio-850” and the following technical parameters was established, including the regeneration time of the biocarriers, the loading mass and the intensity of the fine bubble aeration of the water-sludge mixture. A mathematical model of the efficiency of air regeneration was developed, reflecting the influence of all the above parameters. The obtained predictive matrix for efficiency values was used to develop a geometric model of the efficiency surface. This model provides an optimal selection of technological parameters for air regeneration of immobilised biofilm in a biological wastewater treatment aeration tank bioreactor, ensuring a sufficiently high regeneration efficiency.

The study is aimed at the features of modeling the stress-strain state of a concrete beam, reinforced with two types of fibrous composites. The necessity of strengthening existing reinforced concrete structures can be caused by the reconstruction or technical re-equipment, which often entails an increase in the load on the load-bearing structures of buildings and facilities, as well as during the elimination of the consequences of factors that led to a decrease in the bearing capacity or a failure of loadbearing structures. In order to study the applicability of the model, we analysed the results, obtained during bending and axial compression tests of T-section reinforced concrete beam specimens with welded frame reinforcement that were in operation and the results of a numerical study in a LIRA software suite. The stress-strain state of specimens was modelled in a nonlinear formulation using the finite element method. The conducted analysis and theoretical studies have shown the applicability of models, developed based on a limited test database, unclear, especially with regard to a wide range of compression coefficients, while the results of modeling the behavior of reinforced concrete beams have demonstrated sufficient accuracy for applying in the strengthening design using external composite reinforcement.

Improving approaches to the management of an investment and construction project at all stages of its life cycle, including justification of investments, engineering surveys, architectural construction and organisational-technological design, construction, operation, decommissioning, demolition and disposal of the facility, including in conditions of uncertainty and risks, represents a key strategic direction for the development of enterprises. The problem of improving the efficiency of managing the company intangible assets appears relevant, since the efficiency of decisions, in particular, and the efficiency of the enterprise as a whole, largely depends on its solution. The study used methods of a system analysis, statistical-comparative and economic-mathematical methods, as well as the methods of economic and statistical analysis of indicators, characterising intangible assets, including the ranking method. The authors studied the life cycle features of an investment and construction project for enterprises of the mining and processing complex. The stage phases of the investment and construction project, linked to the specifics of the Far Eastern mining industry, are considered. The need for a detailed structuring of life cycle phases and stages for an investment and construction project for a digital intelligent support of effective decision-making, as well as for a use of the potential of intangible resources of performers, is substantiated. In this paper, the developing Soyuznoye graphite deposit (Dalgrafit LLC) is used to design a sequence of processes and procedures for the implementation of the considered project. Based on the existing potential of enterprise intangible resources, management measures are proposed aimed at improving project management processes with the possibility of digitalising individual business processes of the enterprise.

This work identifies the operation characteristics of axially loaded metal columns located within a foam concrete casing. The structures based on steel elements structurally combined with monolithic non-autoclaved foam concrete, used as filling for cladding, were investigated. The load-bearing capacity of axially loaded columns in free and constrained loads were compared. The columns were loaded using vertical test benches, and longitudinal deformations were recorded using a TK-50M strain gauge. Transverse movements (hogging) were measured using a dial gauge. Comparative theoretical calculations for the bearing capacity of loaded columns were carried out in accordance with the building rules and regulations SP 16.13330.2017 “Steel structures”. In experiments involving static axial loading of open-section columns, an increase in the stability of constrained columns was determined, and the ratio of longitudinal hogging of columns in a free and constrained state was shown. In addition, it was revealed that the size of the casing influences the magnitude and nature of the longitudinal bending. Therefore, it became possible to save metal by reducing the cross-section of the columns, while maintaining a bearing capacity similar to that of the free columns. The study demonstrated that as the ratio of the area of the surrounding foam concrete casing to the cross-sectional area of the loaded column increases, metal savings are correspondingly higher.

The article considers issues of forecasting temporal variations in the condition of roads. The road condition is affected by external factors against the background of internal processes, occurring in construction layers. Most mathematical models, forecasting the service life of roads, are developed on the basis of strength characteristics, which, in conditions of limited financing of regional and local significance roads, leads to certain difficulties in their practical application. Therefore, it is necessary to develop a model of variations in the condition of road pavements based on data about their consumer properties, such as evenness, adhesion coefficient and pavement condition. The process of reducing the evenness values, pavement condition, and adhesion coefficient over time can be described using the Weibull distribution. The paper presents mathematical models of temporal variations in the condition of the road pavement, adhesion coefficient and longitudinal evenness. The data of the model and annual road diagnostics, compared for assessing the model effectiveness, demonstrated high convergence. The proposed approach to assessing the variations in the pavement condition, evenness and adhesion coefficient makes it possible to increase the efficiency of managing the road condition.

A certification in accordance with ISO 14 001 and EMAS allows the impact of economic activities on ecosystems to be understood and assessed, as well as environmental goals and objectives to be set. The effects of environmental management systems (EMS) largely depend on how companies decide to use them after certification. In this regard, the author explores issues, related to the use of ISO 14 000 and EMAS standards for improving the environmental safety of companies. The methodology is presented in the form of an environmental standardisation model and various levels of the company environmental certification. The importance of environmental education of employees and a positive organisational climate is explained. However, the introduction of environmental management systems does not always lead to improved environmental performance of companies. Some companies focus on formal criteria. Nevertheless, EMS, environmental auditing and the principles of ISO 14 000 can help companies reduce their negative impact on the environment and increase their competitiveness. In a situation of uncertainty, the organisational climate, especially the attitude of employees towards the environment and environmental values, is of a priority importance for the implementation of the EMS objectives. Problems, associated with an ambiguous interpretation of standard requirements, were identified. It is recommended to pay attention to the creation of a positive organisational climate for successful environmental certification. In addition, there is a need for a more accurate assessment of the environmental activity effectiveness with a clear formulation of the requirements to standards and a control over their implementation.

The relevance of the study consists in the problem of incompletely regulated legal relations in the field of emergency forecasting. This problem represents an important factor and condition for the unpredictable and uncontrolled generation and development of environmental hazards, threats and risks, as well as contributes to the preconditions for the occurrence of natural and technogenic emergencies. The study aims to systematically assess and develop ways to solve the problems of preventing unfavorable technospheric situations in municipal territories in the context of an ever-increasing technogenic impact of production and consumption wastes. The study emphasises the search for methods, organisational-technical measures and best available technologies for preventing natural and technogenic emergencies, as well as their socio-economic, natural-resource, environmental and other adverse consequences. A system analysis of quantitative and qualitative indicators, parameters, factors and conditions, affecting events and formation processes of environmental hazard sources, represented by end-of-life, spent, utilised construction and other products, formed in the process of human activity and life support of settlements, is carried out. Based on the results of a joint research, the authors made an attempt to form an idealised conceptual model of a resource-saving system for an environmentally safe management of life support production and consumption wastes in technospheric territories.

The study is aimed at comparing the ultimate tensile stresses with respect to the crack resistance criteria of concrete and fibre concrete based on theoretical and experimental data. The resistance of concrete to cracking is determined by the ability to resist the formation and growth of cracks. According to the cracking resistance criterion, concrete deformations are limited by the ultimate tensile strength of the concrete matrix, insignificant for heavy concrete, and the introduction of dispersed reinforcement can significantly increase its tensile strength and crack resistance. Recommended methods for calculating the crack resistance of fibre concrete structures are based on the procedures, used to calculate the crack resistance of structures, reinforced with bars, and incompletely account the features of a fibre concrete as a structural material. In addition, although even a significant crack opening cause no effect on the bearing capacity of fibre concrete structures, generally accepted methods for calculating fibre concrete structures exclude cracking. The article discusses various options for calculating the ultimate tensile stresses of concrete and fibre concrete for ensuring crack resistance based on reference normative and experimental data. Dispersed reinforcement with metal fibres was established at least doubling the ultimate tensile strength according to the crack resistance criterion with even lowmodulus fibres effectively improving the crack resistance, which ensures a more reliable operation of structures, including during winter concreting.

The article discusses the main approaches to the selection of a land plot for municipal solid waste disposal facilities, taking into account urban planning features. According to the analysis and theoretical studies, the selection of a land plot for municipal solid waste disposal facilities implies an interdisciplinary study and design of the territory, planned for development. The main objectives of the study include environmental protection requirements, building codes and regulations, sanitary and hygienic, engineering-environmental and urban planning rules. The paper analyses the main aspects of organising a land plot for municipal waste disposal facilities. The greatest attention is paid to the study of the regulatory framework in the field of urban planning in terms of determining the legal status of territories for the location of municipal solid waste disposal facilities. The paper develops an interdisciplinary model for studying the criteria of selecting a land plot for municipal solid waste disposal facilities. The necessary industrial regulations, defining the composition of requirements for the selection of a land plot for municipal solid waste disposal facilities, which should be improved taking into account urban development, are highlighted.

The study, conducted at the facilities of Chelyabinsk, aims to identify the essence of the comfort visually-shaped perception of the artificial architectural and light environment. This is achieved by an integrated approach, which involves the analysis of scientific and information resources, including regulatory and legal documents, field observations and surveys, graphical analysis of architectural and light environmental fragments under artificial lighting. An analysis of the regulatory framework on the lighting of architectural objects and urban space demonstrated the technical regulations of this sphere clearly articulating the visual comfort concept and its parameters only in relation to the interior space and the road transport system. The study clarified the concept and conditions of creating a shaping aspect in the visual perception of the urban artificial architectural and light environment. Mostly in terms of comfort for this process, the Chelyabinsk areas of the architectural and light environment in artificial lighting conditions were studied. Based on the results of the study, it can be concluded that the process of forming an artificial architectural and light environment of the city should be based on a visuallyshaped comfort, proceeding in a certain sequence and associated with the emergence of new factors of innovative urban environmental development. The relationship between the visually-shaped comfort of perceiving the artificial architectural and light environment, as well as the basics of the functional safety of subjects at the nodal points of the city were established. According to the experience of a typical domestic metropolis of Chelyabinsk, theoretical and research materials, presented in the article, can serve as the basis for the further interdisciplinary development of a visually comfortable and safe artificial architectural and light environment of cities.