Building materials are classical composites with heterogeneous and multiphase structure. Components are introduced into their composition - industrial waste. Based on the author's developments, the modification of fine-grained concrete with mineral additives based on industrial waste from the Lower Volga region as hardening activators and fillers of concrete compositions leads to an increase in compressive strength. Fine-grained concrete modified by industrial waste components (construction composition) will be widely used due to its architectural and construction properties, increased physical and mechanical characteristics, versatility and an affordable raw material base in the Lower Volga region, which is economically and environmentally justified. It is concluded that fine-grained concrete modified by industrial waste components (construction composition) is promising at all stages of construction of buildings and structures.

Keywords: electronic payment system, distributed registry technology, decentralized electronic payment system, digital money, national digital currency

Investment and construction projects (ISPs) are a complex set of individual business processes that require significant funds, time and human resources. The main task of each ISP customer is to reduce these costs while maintaining the quality of the project. Currently, digital technologies are successfully used for this purpose, which reduce its cost at each stage of the development of the ISP. However, it is necessary to take into account a number of problems that are characteristic of modern systems of digitalization of design processes. Such problems include: a limited choice of specialized software products on the Russian market; the lack of a clear mechanism for the interaction of several software products designed to solve technical, technological and economic problems of ISP; a low level of adaptation for building a BIM model; lack of effective tools for processing large amounts of information.Solving such problems is a complex and multi-vector task.

Keywords: resources, database, key project indicators, hierarchy analysis method

The analysis of accuracy in obtaining geospace information while monitoring railway infrastructure objects by different methods such as geodesic, photogrammetric and remote sensing is carried out in the article. Tachymeter and global navigation satellite systems are used as geodesic methods. Aerial photography by means of unmanned aerial vehicles are referred to photogrammetric methods. Remote sensing was carried out on the basis of 3 D laser scanning technologies. The accuracy of performed measurements is considered for the scale 1:500.

Keywords: global navigation satellite systems, unmanned aerial vehicles, geospace information, accuracy of measurements, 3 D laser scanning, tachymeter

The life cycle of a capital construction facility is an economically feasible program for the design, construction, operation and abandonment of a building or structure. This article reveals the role of the life cycle project in the redevelopment of industrial facilities, such as above-ground plants and factories within the city and mining facilities. The article provides a methodology for drawing up a life cycle program for redevelopment of industrial (above-ground and underground) objects, a mine field.

Keywords: life cycle, redevelopment program, underground facilities, modeling, information construction, industrial facility, mine workings, mining facility

The article discusses the design of a retaining structure in complex engineering and geological conditions, taking into account foreign and Russian regulatory requirements. The authors presented two design solutions for a retaining wall from a row of bored piles, made according to Russian and foreign regulatory prerequisites. For both construction options, the SSS parameters are determined and compared. In conclusion, it was concluded that the design of the retaining wall, made according to foreign regulatory prerequisites, turned out to be much more economical.

Keywords: retaining wall, ground anchor, calculation, protective structure, design, retaining structure, bored piles, road, stability, construction, road construction

A review of the problem of accounting for random factors in the scheduling of construction projects is considered. The problems of taking into account random factors in construction scheduling have been considered in works. However, these studies have not paid full attention to the course of construction for large projects. At the same time, scheduling problems are closely related to optimization of working hours and resource allocation in construction production. Such tasks are usually solved by considering several variants of the technological sequence of works, and the typology and variability of random factors are not fully taken into account. A number of researchers have the view that the determining factor in estimating the actual duration of construction is the reliability of suppliers and delivery of construction products. However, it is not possible to ensure the construction process in reality without interruptions in work. The main reason for this is random factors. It is suggested to take them into account on the basis of modern information technologies including artificial intelligence, stochastic approaches, probability theory and mathematical statistics.

Keywords: Construction organisation, random factors, organisational expectations, calendar modelling, stochastic search, genetic algorithms

The paper considers the modern principles of the organization of the technical customer service. The disadvantages of the existing system of forming the structure of the technical customer are indicated.

Keywords: technical customer, organizational structure, self-regulating organizations, national register of specialists, construction control ensuring production flexibility

During the construction of water treatment stations in group water pipelines, it exceeds 15 ... 30% of the cost of the entire system and directly depends on the technological scheme, the choice of which, in turn, is influenced by the quality of the water in the source and the performance of the station. In large group water supply systems, water from surface sources is usually used, which must be clarified, discolored, deodorized, and disinfected.

Keywords: plumbing, reagent, turbidity, filtration flow, reliability, non-failure operation, sediment, technological schemes, investments, filter

This article discusses the relationship of all stages of the life cycle of buildings on the basis of information-analytical system IAS HCS. The full life-cycle cost of a 1,000-seat school was calculated. Using the IAS HCS program, we made calculations of the costs of repair work on three models: without taking into account any repair work, taking into account the repair of the main structural elements and taking into account the repair of all elements, based on the standard operating time. Real estate life cycle cost analysis can be performed for both new and existing buildings of any type (residential and public). Evaluation of the total costs of the full life cycle of the object can be applied by both the developer and the owner of the building to further improve the management system of the property.

Keywords: lifecycle of construction object, information modeling, social facilities, cost of repair work, replacement cost

The article discusses the organizational aspects of the inspection of building envelopes and structures within the framework of construction and technical expertise using an instrumental measuring method. The implementation of a comprehensive field survey in identifying certain structural defects is necessary, however, the methods used by experts have significant differences in the accuracy of the results provided and the simplicity and ease of implementation, which affects the progress of the work.

Keywords: construction and technical expertise, building structures, quality of construction works, non-destructive testing, destructive testing, inspection methods

Judicial construction and technical expertise is used to resolve disputes between customers and project executors and is carried out on the direct order of legal entities or individuals, including in connection with the need to provide expert information to the court. In the course of construction and technical research, various kinds of tasks arise before the expert, the solution of which allows us to formulate answers to the questions posed in the framework of the study.

Keywords: forensic construction and technical expertise, expert opinion, tasks of the expertise, questions of the expertise, expert-builder, inspection of the object.

Currently, artificial intelligence is gaining more and more development in various sectors of the national economy. However, he is not able to function without the control of a person and helps him in solving a narrow range of tasks. In the article, based on the analysis of leaders in the implementation of AI, the prospects for its development are considered. The role of company management in projects for the implementation of AI tools and methods is emphasized. The possibilities of introducing AI methods in the construction industry are considered. It is proposed at the initial stage to apply machine data processing to solve logistics problems. The main stages of the implementation of AI elements for construction organizations are proposed.

Keywords: artificial intelligence, construction, supply, material resources

This article discusses the possibilities of BIM technologies for predicting, responding to and eliminating the consequences of natural and man-made emergencies. BIM systems make it possible to simulate various scenarios in the event of an emergency and choose the most effective and safe solutions to minimize human and material losses, and improve the level of managerial decision-making during evacuation. Modern technical means used in conjunction with BIM technologies make it possible to acquire knowledge and practical skills as part of the training of rescuers and other specialized services.

Keywords: BIM technologies, BIM model, emergency, flood, fire, 3D laser scanning, restoration work

Today, the Russian Federation is among the three leaders in oil production among all countries of the world. This mineral makes up the bulk of our country's exports. The main part of the reserves of "black gold" in our country is concentrated in regions with special climatic and geological conditions (areas of permafrost and seismic activity). This article discusses measures to protect structures from seismic impacts.

Keywords: earthquakes, construction, seismic activity, oil, seismic protection, petroleum products, structures, mining, vertical steel tank

The design of new buildings and structures is currently a complex and multifunctional process divided into several main stages. A large number of design organizations engaged in the development of large investment and construction projects are constantly improving their activities in order to optimize production costs and increase the efficiency of design solutions. The development of new approaches that are beginning to be applied in design is very slow, which is explained by several reasons. These include a narrow range of software, the lack of a methodology that combines digital technologies and the principles of "lean" construction, which provides savings in consumed materials and resources, as well as shortening the design and construction of the facility. In this regard, consideration of issues related to the development of a new concept combining the principles of digital design and "lean" construction is currently very relevant.

Keywords: lean construction, digitalization, project, building, design

Currently, the processes of designing buildings and structures are becoming more costly, as they require the involvement of more specialists, material and technical resources and a reduction in the calendar time of work. At the same time, the customer of the project requires optimization of design solutions in order to preserve the quality of the work carried out. In this regard, there is a need to develop a special design methodology, based on which it is recommended to use the principles of "lean construction", which can reduce the Customer's losses during project development.

Keywords: project, building, construction and installation works, losses, work schedule

The overlapping time of the layers during the layer-by-layer laying of the concrete mixture during the construction of massive monolithic reinforced concrete structures is an important technological parameter of concreting, linking the rate of concreting, the thickness of the laid layers and the design parameters. For traditional concrete mixtures compacted by vibration, this parameter is determined by the persistence of the concrete mixture, taking into account its temperature. When using self-compacting concrete mixtures, the time of overlapping layers, in addition to traditional factors, significantly depends on the period of formation of the "elephant skin". The influence of the overlapping time of the layers on the strength of their adhesion, depending on the properties of the concrete mixture and the method of its laying, was studied. The ultimate tensile strength in bending was used as a criterion for adhesion strength. It has been confirmed that when using a traditional concrete mix compacted by vibration without superplasticizing additives based on polycarboxylate esters, the overlapping time of the layers of 2 hours provides a seam of equal strength with the main body. For self-compacting concrete mixes using vibration when laying subsequent layers after the first, the overlapping time corresponds to the storage index and increases to 6 hours, and when layered without vibration, the adhesion strength decreases by about 20%, 70% and more than 90% with an overlapping time of 2.4 and 6 hours, respectively.

Keywords: self-compacting concrete mixes, massive reinforced concrete structures, overcoating time, "elephant skin"

Carrying out work on the inspection of buildings and structures is a set of measures aimed at identifying the actual condition of the object. Since the work on the inspection of buildings includes the work of various specialists, various problems arise related to the incorrect organization of the work. This article is devoted to the identification of the main elements of deadlines, with a reserve for the further development of a tool to reduce the impact on the timing of work.

Keywords: inspection of buildings, interaction of specialists, organization of work, non-destructive methods for determining the strength of concrete, project management

The variety of options for construction of inverted roofs with exploited roof coverings necessitates an analysis of structural and technological solutions at the stage of variant design of exploited roofs. At present, there is no comprehensive assessment and analysis according to a system of criteria that sufficiently fully characterizes the design of the roof on a structural and technological basis. The study evaluates three basic grouped and systematized options for inverted roof construction (with supports, without supports and rooftop parking) by a system of criteria for an exact evaluation of the efficiency of a roof in construction projects using expert analysis. The proposed system of evaluation criteria makes it possible to determine the optimal solutions for inverted roofing in a practice of building construction in case of variant design.

Keywords: inverted roof, exploited roof, exploited coating, variant design, system of criteria, systematization, structural and technological solution, evaluation of options, expert analysis, mathematical modeling, optimality, efficiency

The article is devoted to the assessment of the organizational and technological documentation of construction, the possible four groups of indicators that are necessary to obtain a qualitative assessment developed by the CTD are considered. A possible technique for determining the quality of CTD is given. A method of expert assessments is proposed to obtain the weight characteristics of the identified indicator. The description of the term "system" as a fundamental element of construction is given.

Keywords: design, quality indicator, system, systematic approach, groups, organizational and technological solutions, indicators, organizational and technological documentation

The procedure for carrying out a set of works to preserve the object of cultural heritage of regional significance "The mass grave of Soviet soldiers who died of wounds" is given. All stages of carrying out such types of work are considered, recommendations are given for solving issues that arise in the process of carrying out work.

Keywords: repair, object of cultural significance, work technology, inspection, building structures, mass grave

A huge part of the territory of Russia is located in the permafrost zone. Ensuring the reliability of pipeline systems transporting hydrocarbons in these conditions requires an integrated approach that takes into account the structure of the soil, the peculiarities of construction methods, the temperature characteristics of the soil and the transported products. Evaluation of the interaction of the pipeline with frozen ground is an important factor in the design. And the justification of the choice of an engineering solution for the construction of pipeline systems, ensuring their stable position, is one of the tasks of our research. The gas pipeline at the Kamennomysskoye-Sea field is considered as an object of research. A brief description of the features of the construction area is given. A strength calculation was performed, on the basis of which the design parameters of the pipeline were adopted. A comparative analysis of the ways of laying the pipeline was carried out, which made it possible to identify the most satisfying conditions of reliability and economic efficiency.

Keywords: hydrocarbons, pipeline, permafrost soil, subterranean laying, elevated laying, strength calculation, sustainability calculation

The article presents a comparative analysis of some technologies for the construction of industrial floors for buildings and premises for various purposes. Their main characteristics are determined, the advantages and disadvantages of using the studied technologies are highlighted.

Keywords: industrial floors, polymer floors, topping floor coverings, self-leveling floors, polymer impregnations for concrete

The used mechanisms of management of the construction complex do not provide the desired result in the field of technical equipment of construction. Management of this line of activity is carried out without effective analysis and further planning. Therefore, the creation of integrated organizational structures, with specific tasks facing them, can provide, in the opinion of the authors, a solution to the existing problems identified in the article. It is proposed to create organizational structures of ""Centers of technical equipment of construction"" of two types, the main purpose of which is to increase the level of security of construction with the necessary machines and mechanisms. The used mechanisms of management of the construction complex do not provide the desired result in the field of technical equipment of construction. Management of this line of activity is carried out without effective analysis and further planning. Therefore, the creation of integrated organizational structures, with specific tasks facing them, can provide, in the opinion of the authors, a solution to the existing problems identified in the article. It is proposed to create organizational structures of ""Centers of technical equipment of construction"" of two types, the main purpose of which is to increase the level of security of construction with the necessary machines and mechanisms.

Keywords: centers of technical equipment of construction, machines and mechanisms, a fleet of construction equipment.

The measures aimed at material and technical support are given, as a result of which high performance in housing construction can be achieved. The performance criterion of material and technical support during the construction and installation works is proposed in the form of a reduction in the duration of a project construction, which results in a reduction in the cost of work and resource savings. As an example, the procedure for calculating economic performance by the material and technical support factor during the construction of a large-panel two-section apartment building of variable number of storeys is shown. The calculation measures are based on reducing the necessary stocks of structures at the construction site, as well as reducing the costs associated with their acquisition and storage. It is shown that as a result of the proposed measures in the material and technical support of construction, based only on the main structural components, it is possible to obtain a noticeable economic effect due to a reduction in the dura-tion of construction and in additional costs in the conditions of the construction site.

Keywords: construction, construction and assembly work, large-panel buildings, logistical support, material resource inventory