The use of laser radiation for welding aluminum alloy AD33 can improve the quality of welded joints and process performance. At the same time, most of the welded structures in production are performed using automatic laser welding installations, which allow ensuring the necessary quality of welded joints, including due to the constancy of the technological process modes. However, there are a number of industries where manual laser welding installations are indispensable and in high demand. At the same time, a distinctive feature of the manual laser welding process is the problem of ensuring the constancy of the duration of exposure to laser radiation on the surface of the workpiece when the speed of the laser beam changes. The paper presents the results of a comparative study of the dependence of the quality of the AD33 aluminum alloy welded joint on the change in the speed of the laser beam for manual and automatic laser welding conditions.

Keywords: aluminum alloy, laser radiation, welding, welding bath, technological process, microstructure, AD33, laser beam, manual laser welding, Al–Mg–Si, aluminum thermal deformation coefficient, vacuum chamber, pulsed laser

A device for compacting the snow mass using the vibro-vacuum compaction method has been designed. Calculations were made in the SolidWorks 2018 software product. The calculation of the estimated economic efficiency of compaction of the snow mass using vibro-vacuum compaction was carried out.

Keywords: cleaning of the adjacent territory, vibration-vacuum compaction, installation, calculation of economic efficiency

Urbanization and increased production have led to the fact that every year the world generates a large amount of plastic waste, which pollutes the environment. Using them in the construction industry will help solve this problem, as well as get profitable solutions in the production of building materials and mixtures.

Keywords: plastic waste, environment, construction, construction materials

Physical wear and tear can be determined either by studying with the help of instruments, or relying on regulatory and expert methods. The first helps to obtain reliable indicators of physical wear, but to obtain it requires less materials. Normative and expert methods - the second make it possible to identify the degree of wear with less accuracy, but it requires a small investment of materials and time. Two similar methods include the "Methodology for determining the physical deterioration of civilian buildings", which was created by MINKOMHOZ of the RSFSR, as well as Departmental building codes 53-86 (r) "Rules for assessing the physical deterioration of residential buildings." The problem of lack of information in the absence of the possibility of personal inspection of the evaluated structure, and, in addition, the obsolescence of the methods makes it difficult to use them. In this case, it is logical to use calculation methods.

Keywords: corrosive wear; reliability; durability; classification

Rostov-on-Don is one of the largest cities in Russia, it is planned to renovate the territory of the old airport, which in turn can stimulate an increase in the load on the city's transport system. In this regard, the issue of proportional development of the city's transport infrastructure is becoming especially relevant. The solution to the problem can be the modernization of the current and the creation of a conceptually new transport and logistics structure aimed at using passenger transport. This issue is considered within the framework of the concept of sustainable development of the city.

Keywords: transport infrastructure, renovation, the old airport of Rostov-on-Don, urban passenger transport, sustainable development

The results of scientific and experimental research on determining the width of the crack opening in concrete under the influence of mechanical load are presented. In the process of scientific research, a simultaneous complex measurement by tensometric and acoustic methods of the load of deformation, the width of the crack opening, the total count of acoustic emission was carried out to obtain complete diagrams of concrete deformation. As a result of the experiments, regression equations were obtained and the correlation dependence between the crack opening width and the total acoustic emission count was established.

Keywords: lightweight concrete, crack width, tensometric method, acoustic emission, deformation diagrams

The article considers the introduction of serveying as a new complex analysis of real estate objects, its concept, directions and main structures.

Keywords: serveying, expertise, integrated approach, real estate, construction, efficiency, quality, analysis

The article presents proposals for the calculation of three-layer reinforced concrete slab structures, the outer layers of which are made of heavy concrete, the middle layer is made of lightweight expanded clay concrete. Experimental elements were calculated according to the compiled program of iterative calculation, which takes into account the concrete deformation diagram in an explicit form. The calculation program reflects a technique that allows you to determine the actual distribution of deformations in sections with a crack and in the areas between them. The results of the calculation of the prototypes indicate a close convergence of the theoretical values ​​of the breaking moments, deflections, deformations of the extreme fibers, and cracking forces with those directly recorded in experimental studies.

Keywords: concrete, reinforced concrete, expanded clay concrete, reinforcement, three-layer slab, prestressing, calculation methods, deformations, stresses, deflections

In the modern world, the issue of the ratio of the quality of construction technologies at oil production facilities and prices for various types of services associated with this activity is very relevant in the oil and gas sector. In this sector, there is constant competition between companies in search of the most efficient, cost-effective and innovative project. Design and survey work is a very important part of any project. Determining the cost of design and survey work is an important stage in the organization of the construction process. The contracting of design organizations takes place in a market economy, taking into account the expected quality of work, and also represents a labor-intensive process that cannot be implemented without the development of internal concepts among companies. The article will review the existing successful concepts for determining the cost of design and survey work that are used today. Also, the use of modern technologies at the stage of design and survey work can not only improve the quality of work, but also solve the cost issue.

Keywords: oil and gas industry, design and survey work, general designer, contracting, new concepts, cost, quality, new technologies

The article provides data on the influence of external composite reinforcement of reinforced concrete compressed elements on their deformative properties. It was found that the deformations of reinforced samples, found according to the current standards, have significant discrepancies with the experimental values. Based on the analysis of the results of experiments, proposals were made to the methodology of norms for calculating the ultimate compressive deformations of concrete εb3, which take into account the type and percentage of composite reinforcement and ensure a good agreement between the experimental and theoretical values.

Keywords: concrete, reinforced concrete, composite material, carbon fiber reinforced plastic, external reinforcement, deformations, compressed elements

The article deals with the actual problem of minimizing the negative impact on the environment of the construction process. The concept of sustainability in the construction industry is defined. The main factors contributing to the formation of sustainability in the construction industry are identified. Practical recommendations for solving environmental problems in the construction industry have been developed.

Keywords: sustainability, construction, ecology, energy conservation, sustainable materials, resource conservation, efficiency, ecological balance

This article provides a theoretical description of the vibration turbulization process. It is shown that with constant physicochemical properties of the system, the volumetric mass transfer coefficient in the liquid phase during vibration turbulization depends on the mixing power and gas content.

Keywords: vibration impact, mass transfer, gas content

This article describes the methods of determining the technical condition of parts and assemblies of electrical equipment and also analysis of electronic engine control systems and it’s components that are most susceptible to failure as a result of automation in the automotive industry. Methods described in this article allow for diagnostics with constructional peculiarities of modern car engines taken into consideration, also most effective of them are offered.

Keywords: electronic control unit, car, engine, check, diagnostics

The article presents the organizational and economic mechanism for increasing the investment attractiveness of the region, based on the system of investment design and implementation of investment projects, based on the complexity of the development of the region's economy, and including not only the identification of the investment potential of the region, but also the establishment of sources of capital investments; identification of directions for the development of the region, taking into account the calculations of the possible results of financial injections into these objects; creation of a phased financing plan for the taken object, the beginning of its implementation and control over it; obtaining state support for the development sector of the regional economy during the implementation of the investment project in the form of tax incentives, lower lending rates, etc.

Keywords: region, regional economy, investments, investment policy, risk, investment risks, investment portfolio, socio-economic development