The article presents experimental studies of the effect of activated mixing water on the technological properties of building cement mixtures prepared with water treated in the electric field of soluble electrodes. As a result of water treatment in the electric field of soluble electrodes, the material of the electrodes dissolves and, depending on the field parameters (intensity, current strength), the water is saturated with polyvalent aluminum hydroxide, which affects the formation of a crystallization structure, which is formed due to the chemical interaction of the binder and ions of the dissolved material electrodes. As a result of the formation of crystalline hydrates, the hardening process is accelerated and contributes to an increase in the technological properties of the building mixture (strength, normal density of the mixture, setting time). The purpose of the study: scientific substantiation of the effect of water treated in the electric field of soluble electrodes on improving the technological properties of the building mixture. Methods: experimental studies of the effect of mixing water treated in the electric field of soluble aluminum electrodes, depending on the material of the electrodes and the characteristics of the electric field, on the technological properties of the mixture. To determine the effect of increasing the technological characteristics of the building mixture, the influence of the duration and modes of water preparation on the strength of the cement stone at different hardening times, the setting time, and the plasticity of the mixture were studied. Results: The results of experimental studies proved the possibility of improving the technological properties of building mixtures prepared with water treated in the electric field of soluble electrodes, confirmed the possibility of increasing the compressive strength of the studied samples compared to control samples. A cement mixture prepared with treated water is more plastic than a mixture prepared with ordinary water.

Keywords: electric field, soluble electrodes, tension, cement stone, strength, mobility

Geodesic control plays an important role in the reconstruction of cultural heritage sites. It allows the accurate determination of the geometric parameters of historic objects, which can be particularly important for restoring their historic size and shape to achieve the most accurate match to the original appearance. Geodetic work is carried out to support the accuracy of design and construction. They allow you to monitor the consistency of the design documentation and the actual work performed. This can help avoid errors and additional work during the construction phase and ultimately ensure a higher quality of reconstruction. This paper describes geodetic support during the reconstruction of the residence of Patriarch Kirill. Located on a huge territory the complex has a high religious-historical and cultural significance, which determines the quality of geodetic control at all stages of reconstruction and construction works.

Keywords: object of cultural heritage, architectural monuments, reconstruction, geodetic surveys, geodetic network, geodetic control, geodetic monitoring

The article discusses a methodology for improving the energy efficiency of historical buildings that have objects of protection. The main ways of energy saving, which are revealed at the level of the microclimate of the premises, are also considered. The relevance of the topic is due to the complexity of performing work to improve energy efficiency if it is necessary to preserve the historical value of cultural heritage sites. The article proposes organizational and technological measures that allow optimizing costs by reducing losses of thermal energy, by modernizing heating, ventilation and air conditioning systems in the conditions of the historical development of the city of St. Petersburg.

Keywords: energy efficiency, construction organization, engineering systems, restoration work, historical buildings

The article is devoted to solving the problems of choosing a variant of the calendar plan in the complex development of residential microdistricts. At present, a methodology for linking construction and installation works in time and space is being developed, new methods for calculating the organization of work are emerging. Due to the constant change in regulatory requirements in construction, the essential characteristics of scheduling methods change. Variant analysis may include a sufficiently large number of indicators of the quality of the organization of complex development. Therefore, a method for comparing options and choosing the best one is proposed, which takes into account an unlimited number of indicators of the quality of work organization.  At the same time, different indicators can be taken into account for different regions, as well as new ones can be added. The effectiveness of the methodology is analyzed on the example of a residential area.

Keywords: residential area, variant analysis, flow organization of work, quality indicators, regulatory requirements

The purpose of this work is to develop a list of possible categories of the need for major repairs and appropriate criteria for evaluating structural elements and in-house engineering systems. In the process of working on this study, methods of statistical data collection and expert evaluation were applied. As a result of this study, a table of the Category of the need for major repairs of apartment buildings, Criteria for assessing the need for major repairs of apartment buildings, was also presented by the algorithm of actions of a specialist in determining the need for major repairs of apartment buildings. This work is an effective and relevant method for determining the need for major repairs of apartment buildings in comparison with VSN 53-86(p) "Rules for assessing the physical wear of residential buildings".

Keywords: major repairs, apartment building, expert evaluation method, operational reliability, category, criterion

The article is devoted to mathematical modeling of construction of underwater tunnels intended for subway. This type of tunnels can also be used as railway and road tunnels. The most interesting are underwater tunnels-bridges and floating tunnels, but the most perspective and most frequent are tunnels located at the bottom of water barrier.

Keywords: underwater tunnel, subway, finite element method, leave section method, mathematical modeling, construction technology stages, transport tunnel, stress-strain state

The article aims to reveal the essence of the application of multi-criteria decision-making methods in relation to the process of organizing construction production. An overview of multi-criteria decision-making methods is presented. The criteria for the optimal choice of the calendar plan as the main document in the design and implementation of the construction process are described. Using the example of the initial construction schedule, alternative options are proposed and calculation is carried out using multi-criteria decision-making methods to select the best one based on the specified criteria and the situation

Keywords: multi-criteria decision-making methods, calendar plan, construction process, construction organization.

Yemeni cities are urbanizing so rapidly that there will soon be no room for green spaces. In this regard, there is a need to find solutions to provide citizens with the "green" infrastructure necessary for life and health. This article presents the results of an urban planning analysis of the study of existing territorial reserves suitable for the formation of the "green" frame of the city of Ibb, their capacity and structure. Based on the analytical data obtained, the concept of the "green" frame of the city of Ibb was proposed, on the basis of which the system of architectural and urban planning principles for organizing the "green" recreational frame of the Yemeni highland cities was expanded and supplemented.

Keywords: urban planning, urban greening, sustainable development of the city, landscape design, urban environment, reconstruction

In the modern world, the issue of the importance of energy conservation and energy efficiency improvement in various areas, including the housing and communal sector, is quite acute. The use of modern energy-efficient materials and technologies in residential buildings, including during the overhaul of residential buildings, makes it possible to reduce energy consumption and save significant funds for citizens on utility bills.

Keywords: energy intensity, energy efficient technologies, energy saving, housing and communal services, overhaul

This article examines the prospects for the creation of an archaeological park in the city of Volgograd in the Sukhaya Mechetka beam based on the object of cultural heritage of federal significance "Volgograd parking lot". The existing state of the urban area and the tourist attractiveness of the creation of this object, the improvement of interconnections within the fabric of the city are analyzed.

Keywords: urban planning, archaeological parks, dry mosque, city park, recreation

The results of research of engineering solutions for ventilation of swimming pools based on mathematical modeling taking into account real thermal loads and moisture releases are presented. The analysis of air distribution options in rooms with swimming pools for various purposes – a public swimming pool, a SPA complex and a sports pool with bleachers for spectators. Based on the results obtained in the form of distribution fields of the parameters of the air environment, the necessary changes in the schemes of the organization of air exchange are revealed. If the parameters deviate from the normalized values, recommendations have been developed to improve the state of the microclimate. These temperature distributions allow us to conclude that the air temperature near the surfaces of external fences meets the requirements that ensure their safety. conclusions on the compliance of the obtained results with the required parameters of the microclimate for rooms with high relative humidity.

Keywords: Swimming pool, ventilation, heat, moisture, air distribution, microclimate, air environment, numerical modeling

Highways are a fairly significant part of the Iraqi transport system, characterized by increased accidents on the roads. Analysis of the causes of accidents showed their main cause – speeding cars in conditions of increased slipperiness and destruction of the road surface. The influence of the coefficient of adhesion and the degree of destruction of the roadway on the risk of an accident is investigated. Measures to reduce accidents on the roads of the republic are proposed.

Keywords: road safety, the risk of an accident, the coefficient of adhesion, the destruction of the coating, accident analysis, road repairs, the causes of increased accidents

It is an undeniable fact that the environment and its biodiversity are severely disturbed and damaged by the unrestrained and uncontrolled use and disposal of non-biodegradable plastic waste. Growing concern about this problem is stimulating interest in studying the biodegradation of polymers such as polyethylene and polystyrene, etc., which are very stable in nature and cannot easily biodegrade. The decomposition of these relatively inert materials occurs in the environment depending on the presence of several environmental factors such as solar or ultraviolet radiation, heat, oxygen, water salinity, hydrogen index and microorganisms that can use these polymers as food. Humans can create conditions for artificial abiotic and/or biotic degradation of plastic waste. The article describes the directions of plastic degradation, the factors affecting biodegradation, and the chemical and physical properties of plastics. The authors reviewed several ways to biodegrade plastics in the environment and investigated methods to improve it.

Keywords: environment, plastic, biotic degradation, abiotic degradation, plastic packaging, plastic waste

The issues of developing a project for strengthening the building structures of a cable overpass after an emergency (accident) are discussed. On a real example, a description of the accident is given, the performance of work on the ghost of structures to the standard state is illustrated. The article was written on the basis of the completed research work No. 18-26.

Keywords: building structures, safety, cable trestle, emergency response, technical expertise, buildings and structures, metal structures, reinforcement project

A promising direction for improving the durability and transport and operational performance of road pavements is the use of modifiers, including those based on sulfur as a component of the asphalt concrete mixture. However, sulfur and its toxic gases are active substances that can enter into chemical interactions with fillers to form water-soluble calcium and magnesium sulfides CaS and MgS. This process leads to the destruction of the dispersed phase and a decrease in the water resistance of sulfur asphalt concrete. A promising direction that has received wide approbation in the manufacture of polymer composites is the finishing of the filler surface, which makes it possible to prevent the formation of water-soluble sulfides. The coupling agents form a shell impermeable to sulfur, which prevents its chemical interaction with the dispersed phase. The following components are offered as coupling agents: Polymethylsiloxane (PMS-100), SKDN-N rubber, silicic acid sol in a medium containing Fe(OH)3 nanoparticles, and iron (III) hydroxide sol.

Keywords: sulfur asphalt concrete, asphalt concrete, water resistance, strength, sulfur bitumen binders, nanoscale additive

In the course of the history of the development of countries, large cities – megacities were formed. It will not come as a surprise that many have already become familiar with such a term as agglomeration. The emerging infrastructure between regional centers or just around a large city could not do without residents living on its territory. Naturally, it is necessary to create comfortable conditions for living. This is how settlements (including urban-type ones) began to form. But within the framework of the article, the emphasis is placed exclusively on cottage settlements. It is impossible not to pay attention to the experience of the development of settlements in the USA. About 40% live in the suburbs of American cities, which in quantitative terms exceeds 130 million people. The development of new residential areas outside of cities in America was accompanied by the development of transport, socio-cultural infrastructure, educational institutions. Low land prices began to encourage people to move into their own housing. It would be incorrect to project the trend of deurbanization of the United States on Russia. On the territory of the Russian Federation, educational and other institutions are mostly located in cities, mostly in large ones. Despite this, the very phenomenon of the formation of cottage settlements, urban-type settlements has not spared the largest country in the world. It is possible that the infrastructural development of such settlements will be reflected in the future by an increase in the standard of living throughout the country and an increase in the number of people willing to change apartments for two-storey private houses.

Keywords: urban planning, multi-storey construction, experimental buildings, alton west, Pripyat building, post-war construction, development of the idea of ​​a block, block building, social action of building, architecture of the 20th century, post-war

The article discusses the main causes of natural gas leaks and ways to detect them. Data on the volume of natural gas leakage and the nature of damage were obtained at the experimental installation. The objects of experimental research are gas connections to devices, such as: bellows hose made of stainless steel, rubber hose and cap nut of gas connection with varying degrees of tightening. The course of conducting an experimental study of filling a room with natural gas, depending on the degree of damage to the gas supply and its nature, is described. The analysis of the results of the experiment to determine the dependence of the gas flow rate on the type of damage to the gas supply is carried out. The most dangerous types of leaks in the room are determined, graphs of the dependence of gas flow through various damages and methods of their prevention to prevent such situations are constructed.

Keywords: gas leak, gas appliances, leak detection, types of gas leaks, type of damage to the gas supply

The problems of formation of eco-tourism objects in the wetlands of Southern Iraq, which have a unique cultural landscape and natural biodiversity, are considered. The aim of the study is to develop methodological and design recommendations for the formation of a hotel model of a tourist dwelling in the swamps in the form of villas-bungalows over water, which has many economic and environmental benefits. As a methodological approach to the formation of a bungalow, the principles of "green architecture" are used, which provide the most acceptable forms of visual and compositional interaction of tourism objects with the natural potential of the wetland landscape. For integration into the natural landscape, possible options for placing “bungalow houses” in the water area of wetlands are proposed. Taking into account the foreign experience of resort construction, several models of bungalows were identified according to the architectural and spatial features and the structural and tectonic solution of the floor roof and external walls. The methodical stages of designing the interiors of the "bungalow over the water" are presented. The main natural and modern environmentally friendly materials for construction are systematized; describes the technology of erection and decoration of the walls of wooden bungalow houses. The presented methodological recommendations make it possible to implement the principles of "green architecture" and can be used to form resort areas in the South of Iraq in order to preserve the natural landscape, using adaptive models of housing for tourists, identical to the huts of the "Marsh Arabs".

Keywords: green architecture, wetland landscape, bungalows above water, design, methods, materials

This article is devoted to the study of the European experience of designing sustainable architecture in the process of renovation of former port-industrial complexes. The purpose of the study is to identify current trends and approaches to the design of sustainable architecture, taking into account the specifics of the place. The analysis of the experience of Denmark, Sweden and Germany in the transformation of former port-industrial complexes in the context of sustainable architecture is carried out according to a number of criteria: urban planning solution, spatial and architectural planning solution, stylization of the image of new buildings, criteria for energy efficiency and environmental friendliness; economic and social sustainability. The emphasis is placed on the study of the formation of the architectural appearance of buildings. The importance of the interaction of architecture with the environment and context when creating a marine facade is emphasized. The identified design approaches can be used in research, design and educational activities.

Keywords: architecture, building, sustainable, eco-friendly, design, port, industrial, renovation, project, function, facade, context, european, approach

This article described in detail the visualization of 5 case studies in Iraq with two important subjects; The first subject is construction quality control using BIM-compliant construction projects employing Autodesk Revit software; The second subject is quality assurance using BIM and energy analysis, which evaluates the energy usage in accordance with BIM utilizing Autodesk Revit software, and Autodesk Green Building Studio(GBS) Cloud. There are several causes that lead to the selection of these case studies. These case studies are applied models or examples executed by many Ministries such models exist in other governorates in Iraq. Despite the fact that the research topic of quality improvement utilizing Building Information Modeling (BIM) technology was not used in the chosen models, these buildings had several challenges throughout the execution phase. This research will be more valuable when implementing government agencies and private sector companies specialized in construction. wants to use BIM technology to improve the execution quality for future buildings.

Keywords: energy analysis of buildings, construction project, Building Information Modeling, quality, quality control, quality assurance

The results of research permissible longitudinal axial and fiber tensions are given for various characteristics of gas distribution and gas consumption systems.

Keywords: polyethylene gas pipeline, longitudinal axial tension, longitudinal fiber tension, gas pipeline deformation, optimal gas pipeline bending radius

The paper presents the results of studies of the characteristics of a polymer coating for the protection of steel and concrete surfaces based on low molecular weight dimethylsiloxane rubber SKTN-A. For cold curing of the binder and its modification, the MSN-7-80 hardener was used, an additional functional additive was galvanic sludge calcined at 1000 °C and crushed to a particle size of no more than 40 microns. It was found that polymethylsilazane, which is part of MSN-7-80, increases the strength characteristics of the coating, especially its cohesive strength, while reducing water absorption by increasing the hydrophobicity of the surface. In turn, galvanic sludge increases the mechanical strength upon impact. The ecological safety of the obtained material was confirmed by the method of biotesting on the mortality of Daphnia magna Straus. As a result of comparison with a protective coating similar in composition and purpose, it was revealed that the coating obtained in this work surpasses it in strength and adhesion characteristics. The developed polymer composition can be used to protect steel and concrete surfaces in construction and mechanical engineering from shock and moisture, including in extreme conditions of high or low temperatures and in contact with aggressive media.

Keywords: polymer composition, protective coating, organosilicon binder, electroplating sludge, polymethylsilazane, cold curing

The subject of the study is processes related to the construction of strip-shell foundations. The scope of the study is the construction of the base under the shell, providing a curvilinear contour of the structure. Traditionally, the foundation structure is placed in undisturbed soil, which, due to its physical and mechanical characteristics, can limit the scope of application of such foundations. Using the Harrington desirability function, the authors evaluated six models of soil masses with different physical and mechanical as well as technological properties. As a result of the studies, the suggested options were rated “satisfactory” or lower. In this regard, it is required to improve both the quality of the base under the shell and the technology for the construction of such foundations by using cost-efficient prefabricated soil-cement blocks.

Keywords: Buildings, strength, construction industry, foundation, construction technology

Nitrogen oxides are one of the most common and toxic gaseous air pollutants of large industrial centers. The main difficulty of cleaning gas emissions is related to the dependence of the efficiency of the applied cleaning technologies on the NOx concentration, the frequency of emissions, the need for processing and/or disposal of products of interaction of nitrogen oxides with absorbers and regeneration of catalysts. The article analyzes the features of currently used and promising methods of cleaning waste gases from NOx, systematizes data on the effectiveness of such technologies. Based on the analysis of the processes of formation of nitrogen oxides, rational approaches to reducing NOx emissions in metal etching technology and electroplating are proposed.

Keywords: nitrogen oxides, biogenic and technogenic sources, catalytic and non-catalytic purification, selective purification, absorption purification, comparative efficiency

The article deals with the issues of assessing the effectiveness of the construction and operation of metal corrugated pipes. The characteristic features and difficulties of the operation of corrugated metal culverts in areas of permafrost distribution are revealed. The characteristics of the main defects of culverts are systematized. The features of thermophysical calculations of metal corrugated pipes on a frozen base are analyzed in detail. Recommendations are given on the application of the most effective technical solutions in the construction of corrugated metal culverts on permafrost soils.

Keywords: highway, culverts, metal corrugated pipes, thermal conductivity, permafrost soils