bluuebunny/crossref_metadata_2025 huggingface dataset:
Research some key risk factors in construction
Authors: Thi Thu Nga Nguyen , Anh Tuan Nguyen
Published: July 2020

The construction investment project is a collection of activities related to abandonment, expansion or renovation to develop, maintain or improve the quality of work or product or service for a while. One of the main characteristics of a construction investment project is the uncertain environment (potentially high risks). According to the statistics of the Department of State Inspection of Vietnam about the quality of construction works every year, about 0.28% ÷ 0.56% of construction projects have problems. To account for the above issues, there are many reasons related to the investors, designers, contractors, even objective conditions. Therefore, the analysis and giving exact causes of risks are of very high practical significance, and this is also an important basis for devising measures to minimize harm or prevent risks happening. This paper, therefore, attempted to assess the current use of risk management in Vietnam construction projects by an empirical survey. However, within the scope of this paper, the authors conduct a survey to assess some main risk factors, thereby building a relationship between risk management and factors by questionnaires Combined with the statistical processing methods. At the same time, from a research perspective on risks, it is considered in terms of forecasts and is preventable.
Analysis of the current stage of reforming mechanisms for financing shared housing construction in Russia
Authors: Beliakov Sergei , Kapustkina Anna
Published: July 2020

In article the authors present the results of the analysis of the most significant changes in the system of financing investment and construction projects of housing, introduced as part of the transition to the mechanism of project financing, as well as the conclusions of the most important implications of the reporting changes during the implementation of the current stage of reform of financing mechanisms for shared construction in Russia. The authors present an integrated model of interaction between the subjects of shared housing construction, taking into account the allocation of functional subsystems that correspond to the main stages of implementation of investment and construction projects. On the other hand, according to the authors, the most significant changes concerning the radical transformation of the mechanisms for financing shared construction should be described as debatable. Moreover, discussion and ambiguity should be considered in two different aspects: the goal setting aspect and the implementation aspect. The degree of compliance of the actual results of the reform under consideration with the declared goals and its socio-economic effectiveness in General will be determined primarily by the realities of its practical implementation.
Method of evaluation the current state of municipal infrastructure for investment planning purposes
Authors: Nelyubov Artem
Published: July 2020

Nowadays the problem of the municipal infrastructure state is extremely important, both for the Russian Federation and for regions. Municipal administrations face deterioration of fixed assets, lack of available capacity and lack of funding for the development of existing infrastructure. The research is relevant because of insufficient elaboration of existing mechanisms of assessing the state of the city’s municipal infrastructure and the absence of a general tool for monitoring the current needs of fixed assets in the field of housing and communal services. In order to monitor the current state of the municipal infrastructure of the city and further decision-making on the financing of initiatives to modify it, a mechanism has been developed to assess the current state of the municipal infrastructure. The purpose of the study is to develop a mechanism for assessing the current state of public infrastructure systems. To achieve the objectives of the study were used such research methods as: the study of scientific literature and statistical information on the research topic, the analysis of the information, synthesis of information received, development of economic and mathematical models for assessing the current state of municipal infrastructure. The method of hierarchy analysis (T. Saati) and utility functions were used in the formation of integral performance. The result of the study is integral performance for assessment of the current state of the city’s municipal infrastructure. The results may be used in order to improve the quality of decisions in the field of housing and communal services management. In future, the results of the study can be used to develop an economic mechanism for investment planning for the development of municipal infrastructure in the city.
Challenges in managing green building projects from the view of the contractors: An exploratory study in Vietnam
Authors: Tran QuangDung
Published: July 2020

Success of green building projects is significantly dependent on the capacity of all stakeholders. In order to improve the success of such projects, this study seeks to gain a better and deeper understanding of the critical challenges facing the contractors in executing green building projects. The methodological framework used consists of a literature review and a questionnaire survey of green construction experts in Vietnam. The data collected from 163 expert responses was used to conduct the test of Kendall’s coefficient of concordance, Chi square tests, ANOVA and mean ranking analysis. The results indicate that the top five challenges facing the contractors in executing green building projects are “lack of legal regulations and technical codes, standards, guidelines on green building”, “more difficult to early establish a competent, integrated, multidisciplinary green project team”, “more difficult for comprehending the green specifications”, “more difficulty in the selection of competent subcontractors in providing green building services”, and “shortage of reliable green building methods, materials, technologies, and equipments in the market.” The findings bring out valuable implications for the government, the industry practitioners and stakeholders in improving the success of the green building projects in the future. Given the limited empirical studies on issues influencing the success of delivering green building projects, the present study also makes a contribution to the body of knowledge.
Prospects of using Task management in design
Authors: Stepanova Anastasia , Shilova Liubov
Published: July 2020

The article discusses the possibility of organizing project management in design using the Revit and Wrike task manager, a corporate online service for collaboration and project management that allows users to plan projects, prioritize tasks, track the schedule of their implementation and interact with the team. At the same time, the algorithm for calculating time by tasks was developed in the Dynamo environment using the Python language.
The impact of proptech on real estate industry growth
Authors: Siniak Nikolai , Kauko Tom , Shavrov Sergey , Marina Ninoslav
Published: July 2020

The real estate industry is currently undergoing a digital transformation that not only changes its nature in terms of the markets and work environments, but is also influencing its growth. What are the main trends and concerns related to this transformation? To what extent is the real estate industry already prepared for this? This paper reviews the situation in terms of the emergence of a phenomenon known as PropTech. PropTech is characterized by the massive implementation of emerging technology such as home matching tools, drones, virtual reality, building information modelling (BIM), data analytics tools, artificial intelligence (AI), Internet of Things (IoT) and blockchain, smart contracts, crowdfunding in the real estate sector, fintechs related to real estate, smart cities, regions, smart homes and shared economy. This survey of changes in the real estate industry due to PropTech covers four areas: (1) PropTech applications in the real estate industry; (2) implications of PropTech for real estate market transparency; (3) how PropTech could give a region or a company a competitive advantage; and (4) concerns on the wider implications of these changes on a labour market and education. In a plausible scenario, changing the real estate technologies could change system dynamics and improve real estate market transparency. Moreover, it can be asserted that, in a broader sense, PropTech is beneficial for territorial competition and territorial growth strategies. And lastly, under different institutional arrangements, PropTech can affect the changing structure of the real estate market, the demand for hi-tech, new skills as well as emerging policy challenges for the real estate industry.
Establishment of commercial real estate placement and management system in the city
Authors: Khrustalev Boris , Chudaykina Tatyana , Ayupova Zarema , Zhelihovsky Denis
Published: July 2020

Most often, new buildings are the whole areas which grow on the place of former waste grounds or departmental territories. These are the sites, remote from the centre, having nothing in common with trade or business parts of the city. Design codes oblige to put public establishments in the projects. These buildings located in “dormitory area” are also offered by builders as “favourable investments”. Purchaser’s choice of an apartment is very important. In these conditions people are going to live for a long time or may be all their life. That is why much depends on it. It is, of course, the conscious choice. Materials and methods. Methods of the research are theoretical analysis and empirical research, in particular the analysis of statistical data, as well as description and grouping of data. The information base for studying this problem were literary sources (textbooks, manuals) on the problem of enterprises activities, scientific articles, monographs, electronic resources. Methodological basic of the research are such scientific methods as description, comparison, classification. Results. This article analyses the placement and management of commercial real estate in residential many-storeyed buildings, which is considered both on the positive and on the negative side. A general analysis was made, classifications, characteristics were given, as well as patterns of placement of commercial objects were revealed.
Digital twins of complex technical systems for management of built environment
Authors: Bolshakov Nikolai , Badenko Vladimir , Yadykin Vladimir , Celani Alberto , Fedotov Alexander
Published: July 2020

The development of digital technologies captures a significant part of the economy and production, as well as business and management processes. Asset owners are given the opportunity to become additionally owners of digital assets, while the need for conceptual approaches and digital asset management is growing. With the increasing application of Building Information Modelling (BIM) for asset management within architecture, engineering, construction and owner-operated (AECO) sector, BIM-enabled asset management has been increasingly attracting more attentions in both research and practice. The problem associated with the development and production of facilities is related to the discrepancy between as-built as-designed and as-is facilities or complex technical systems. During the stages of design, construction, operation and maintenance (O&M), the actually manufactured (i.e. as-built) complex technical object (or production infrastructure) differs, sometimes significantly, from the designed (as-designed), and at the same time inconsistency between the created production and production infrastructure within which it should operate grows. Solving the problem of discrepancy between the actually created and designed facility or the complex technical system, in the absence of digital technologies, requires considerable time for the so-called “trial operation”, during which the discrepancies are eliminated and a mechanism for managing production and production infrastructure in real conditions is developed. With the development of the digital economy, the need for digitalization of asset management is growing. An analysis of existing information technologies shows that there is a possibility of reducing the cost of production and operation of an asset by concentrating the main costs at the design stage. The article discusses basic approaches to organizing the lifecycle management of technical systems, production and infrastructure in the context of global digitalization which become a useful tool for reduction of trial operation time. Further directions of research are formulated
Solutions to deal with flooding by using green buildings in Vietnamese urban areas from Japanese experience
Authors: Van Giang Nguyen , Thanh Dat Nguyen
Published: July 2020

One of the major problems of big cities in Vietnam is deep flooding in the rainy season, frequent traffic jams, fewer green areas, green parks are narrowed or exploited for commercial exploitation and services. The above consequences are due to many reasons such as rapid urban development, encroachment of rivers and streams that break the natural landscape, lack of synchronous planning … there is still a lack of reasonable technical solutions. Japan is a country with a lot of experiences in flood prevention, about preserving a safe and close environment to nature. These solutions can be an idea for strategic decision makers, governments and the whole community to refer to Vietnam, especially big cities like Ho Chi Minh City learning and applying. Here are some experiences from Japan analyzed and opened by the author to contribute ideas for our city to become more civilized and worth living.
Mechanical behavior of Vinh Long soil mixed with cement
Authors: Thanh Truong Quang , Linh Nguyen Ngoc , Quynh Nhu Nguyen Thi
Published: July 2020

Recently, deep soil mixing has been constructed in Vietnam. However, the researchers applying this solution to reinforce soft ground with geological conditions of Vinh Long are not common. This paper concentrates on study of mechanics of soil samples which are compatile with Vinh Long geological conditions. Experiments on unconfined compressive strength were performed to analyze mechanical behaviors in the duration of curing samples. Soils taken from two layer of researching area were mixed with cement with the content from 150 kg/m3to 250 kg/m3, then were curing in duration of 7 days, 14 days, 28 days and 60 days. Results of tests at specified timeline show that unconfined compressive strength of most mixing samples increases with the cement content and curing period. The secant modulus of elasticity is determined from the deformation resistance test, then the loading capacity of samples can be deduced. The secant modulus of elasticity increases when the unconfined compressive strength increases. This article is a valuable reference in the design of cement-reinforced soft soil for application in infrastructure engineering.
Integrated design and construction approach to hydrotechnical structures in Eritrea
Authors: Kozlov Dmitry , Ghebrehiwot Anghesom
Published: July 2020

During the process of design and construction of water management facilities and structures, such as reservoirs, dams, spillways, water intakes, etc., it is important to pay attention to the specific conditions of a particular country. Since the rapprochement among Eritrea, Ethiopia and Djibouti in 2018, the geopolitical dynamics of the region has changed to a different level. These regional changes will significantly contribute to the development of extractive and processing industries, agriculture, trade, construction and tourism in Eritrea. However, all these developments unquestionably require sustainable and efficient water use, intensive development of water management and water technologies, among others. Based on the specific conditions of Eritrea, identification of existing main trends in the design and construction of water management facilities and structures followed by formulation of practical recommendations and future directions has been the focus of this study. Reliable and relevant information has been processed and analysed using general scientific research methods, including generalization and analysis, synthesis and analogy, historical and hypothetical methods of cognition. This paper comprehended that the design, construction and operation of water management structures should consider the predominantly hot climatic condition of the country, while observing the main development trends in the field. These activities help in ensuring reliable and trouble-free operation of hydraulic structures, using modern and progressive achievements of hydraulic engineering science and global practice in the field of dam engineering and construction of culverts taking into account environmental requirements and norms, and using modern high-performance mechanisms and methods of production of hydraulic works. Moreover, the hydrological and water management conditions of Eritrea are characterized by limited water resources, poor knowledge of water bodies, and lack of reliable hydrological, meteorological and geological information. Under these circumstances, it would be necessary to use mathematical modelling for understanding and forecasting hydrological processes in river basins.
River channel deformations in the area of damless water intake
Authors: Uralov Bakhtiyar , Xidirov Sanat , Matyakubov Bakhtiyar , Eshonkulov Zokhidjon , Norkulov Bakhodir , Gayur Abdulatif
Published: July 2020

A mathematical model of the unsteady uneven movement of the river flow in the area of the damless water intake, flowing in deformable channels, was developed and numerically implemented. In the developed model of the deformation of the river channel, flowing on easily eroded beds, adapted formulas of the transporting ability of the flow are used, the hydrodynamic equations of motion and continuity of the flow, deformation of the channel, and sediment balance. To close the system of differential equations, we use the adapted formula of the conveying ability of the flow–Benold. In the calculations, the non-erosion speed was taken according to the formula C.E. Mirtschulava, taking into account standard values of adaptive coefficients. It is suitable for describing deformation processes, taking into account the drift of dredging slots. The model contains the minimum number of equations and empirical constants. In the present work, a numerical model is proposed for predicting channel processes in river beds in the area of damless water intakes and is verified on the results of experimental studies. The figures show sequential deformations of the channel, arising due to natural causes, as well as due to channel adjustment and treatment works (discharge of soil from the supply channel into the river). As can be seen from these figures, the channel from multi-sleeve is gradually turning into one-sleeve. It has been established that after 1 year of observation at low water, as a result of discharge of sediment from the sewage treatment works, the river ducts die off. These ducts are observed only in the flood. Note that below the Karshi main channel (KMCh), the left bank eroded by about 150 m. After a 10-year course, the low-water course turned into a one-arm riverbed. As a result of the erosion of the left-bank islands, it turned into the river itself. During the flood, there are also no pronounced sleeves, a significant erosion of the left bank is noted, up to 700 m. After that, this bank was strengthened. In the future, the channel process did not undergo significant changes. Towards the end of the 10th year of observation, the channel broadened somewhat, and the flood depth decreased in the flood. Comparison of the results of field and numerical studies shows that the developed model gives good results. For low-water conditions, coincidence is better than for flood conditions. During the flood, under natural conditions, somewhat greater depths are observed on the floodplain than in the calculations. It should be noted that both in calculations and in kind:

- there was a significant erosion of the left bank below the KMCh;

- the channel of the Amudarya river in the considered section from multi-sleeve turned into practically one-sleeve.
Stability of dam slopes of phosphogypsum sludge collectors
Authors: Sultanov Takhirjon , Fayziev Khamidkhon , Toshmatov Elyor , Zokirov Ilkhomjon
Published: July 2020

The results of calculations of the enclosing dam stability of phosphogypsum sludge collectors are presented in the paper. The stability calculations were carried out according to the “RUZO” program; they are based on the method of circular-cylindrical sliding surfaces under the action of basic and seismic loads. The main objective of this work is to determine the minimum safety factors for dam slopes of a given transverse profile under known loads and characteristics of the dam body material. To develop a rational profile of collector dams, 9 options of design models of the structure and its base were considered. The body of the enclosing dams of collectors of considered options consists, as a rule, of two elements: the primary floodwall built of earth materials, and secondary dams constructed according to a different build-up schemes from stored materials. Secondary dams are constructed from stored phosphogypsum by the method of layer-by-layer filling and compaction. The calculations showed that in all considered schemes the minimum safety factors under the action of basic and seismic loads are higher than the standard values. The maximum permissible values of the slopes are established with an allowable margin of safety, thus, the stability of dam slopes in all considered options of the phosphogypsum collector is ensured under basic and special combinations of loads.
Physical modeling of the filtration process through the dam base
Authors: Shaazizov Farrukh , Shukurov Diyor
Published: July 2020

In this article, the results of model studies to determine the value of filtration in different soil layers that form the foundation of the dam for different filling of the reservoir are given and empirical dependences of the filtration level on the amount of filling of the reservoir are given. When conducting research and evaluating the ongoing filtration processes at the dam base, experimental research methods were used using well-known principles of physical modeling on a specially modeled hydraulic model unit. When analyzing the results of experimental studies, methods of mathematical statistics were applied and graphical and empirical dependences were obtained showing the relationship between the pressure in front of the dam and the filtration pressure at the base of the dam. Under the conditions of the physical model, for different filling of the reservoir, the filtration values in different soil layers composing the dam base are determined and empirical dependences of the filtration level on the reservoir filling are obtained.
Assignment of minimum depth of piled foundation in structurally unstable permafrost soils factoring in emergency situations
Authors: Rabinovich Mikhail , Zavodova Alina , Arnautova Anastasiya
Published: July 2020

The set-out task is presented on the example of permafrost soils. Presented results show temperature regime calculations of the soil base of a building constructed according to 1 principle factoring in thermal effects of the underground collector, above-ground heat supply system and the emergency blow-out of high-temperature fluid from communications. Changes in the temperature regime of soils in the soil base of the building are assessed in the article. Article gives recommendations for assignment of minimum depth of piled foundations under presented conditions.
Formation of soil sinkholes in the form of a collapse pipe
Authors: Makeeva Tamara , Trofimov Vitaly
Published: July 2020

The mechanism of formation of sinkholes of the ground surface in the form of a collapse pipe, which characteristic feature is the existence of almost vertical walls with a sinkhole depth exceeding its lateral dimension, is considered in the article. The authors solve the geo-mechanical problem of stress distribution in the rock mass near the underground cavity that initiates the formation of the sinkhole. The extreme parameters (geometrical and strength) which make it possible to initiate the progressive destruction in the form of a vertical pipe of destruction, are defined according to the integrated criterion of durability. The ratio, hat relates the depth of the cavity location, the horizontal size of the sinkhole, the strength properties of the rocks (adhesion, internal friction angle), and the lateral pressure coefficient in the massif is obtained.
Operational efficiency of water damless intake
Authors: Bazarov Dilshod , Markova Irina , Norkulov Bekhzod , Isabaev Kasimbek , Sapaeva Mukaddas
Published: July 2020

An improved hydraulic method for increasing the efficiency of operation of a damless water intake is presented. Physical picture of the movement of bottom and surface sediments during flow division in the damless water intake ABMCh (Amu-Bukhara machine channel). Analysis of the distribution of sediment along the channel of the channel showed that clay particles of suspended sediment <0.005 mm increase from the inlet to the main structure of the ABMCh from 15% to 36%. Dusty particles of suspended sediment d = 0.05 also increase from inlet to G.P. ABMCh from 38% to 66%. Sandy sediment particles d = 0.05 to 0.25 mm, on the contrary, decrease from 3% to 71%, and sediment particles d> 0.25 mm decrease from 1.30 to 0.15%. It is substantiated that the angle of the flow outlet to a greater extent influenced the formation of vortex zones at the entrance to the outlet. The size and intensity of the vortices at the inlet, in turn, determined the pressure loss, as well as the amount of sediment deposited at the water inlet, by the amount of sludge entering the outlet. The analysis of the experiments showed that the optimal threshold angle to the shore is (β = 30°, 45° 60°.; It is recommended that when setting the water intake mode it is necessary to take into account the fact that the reduction of the discharge angle to reduce the pressure loss at the inlet to the water intake, the latter is more intense carried by precipitating suspensions. It has been established that intense deformations of the Amudarya river channel occur in the area of the ABMCH water intake: Due to dredging of the channel by the dredgers, the pulp is thrown into the river channel, it turns out, as it were, storage of sediment on the right bank. This, in turn, leads to a narrowing of the river channel and siltation of the supply channel, which contributes to the movement of the channel to the left bank and complicates the intake from the river into the channel. Taking into account the complexity of the processes occurring during the division of the flow, it is necessary to consider the qualitative and quantitative aspects of this phenomenon ‘in pure form‘, without affecting the moving flow of various anti-ballistic devices. To improve the conditions of water intake and the quality of the incoming stream, an improved scheme with new structural elements is proposed.
A novel approach using sustainable structures in preventing coastal erosion and forming sandy beach in Vietnam
Authors: Phan Quang-Minh , Nguyen Viet-Phuong , Hoang Tuan-Nghia , Vu Ngoc-Tru
Published: July 2020

A new solution using ultra-high performance concrete (UHPC) sheet piles was a hard wall structure combined with gabion groyne dams for the purpose of shore protection, sand accretion, and tourist beach creation was proposed in this study. The proposed approach was then applied to meet the both shore protection and sandy beach generation requirements of private Rung Duong resort project in Ba Ria-Vung Tau, Vietnam. The UHPC sheet piles reinforced by fiber reinforcement polymer (FRP) installed in form of a vertical wall were designed and constructed for the shore protection purpose. Together with the later built gabion groyne dam system, the combined structure brought a very good coastal protection effect. As a result observed from Rung Duong resort, the shoreline was pushed back out very far from the resort, while sandy beaches in front of the resort were formed and expanded widely.
Settlement and bearing capacity of the foundation of a finite width due to extrusion of a loose ground layer from the compressed footing mass
Authors: Ter-Martirosyan Zaven , Demyanenko Valery
Published: July 2020

The paper provides a quantitative assessment of the deflected mode of foundation stratum of finite width foundation, in the compressible thickness of which there is a slack clay soil layer. A number of criteria for assessing the possibility or impossibility of extruding a slack layer depending on its strength and rheological properties, as well as the relative thickness of the layer to its length (h/l) and the relative depth of the layer (h/d) have been given. Closed analytical solutions are given to determine the rate of Foundation precipitation depending on the rate of extrusion of the weak layer, including taking into account the damped and undamped creep.
Comparative analysis of the compression strength characteristics of polymer concrete modified by ultra-fine by-products silicon and aluminum industries
Authors: Balabanov V B , Putsenko K N
Published: July 2020

Presently, one of the actual problems of concrete science is the improvement of concrete formulations by using industrial waste, ultra-fine by-products from the production of aluminum and silicon industry, as well as modification by means of additives. The aim of scientific research is development of new technologies for obtaining concrete with enhanced performance characteristics. The article provides an overview of the causes of concrete destruction and methods for increased physical-mechanical characteristics and of concrete. The results of a literature search on the experience of using silica fume and polymers in concrete are presented. The advantages and disadvantages of using silica fume and polymers in the composition of concrete are identified. A study was carried out to determine the effect of various modifying additives on the physical-mechanical characteristics of concrete. Experimental studies have been conducted on the joint use of silica fume and polymers in concrete mixture. The results of the study are: the optimal amount of silica fume is 10-20 %, the optimal amount of polymer is 1.0-3.5 %. On the basis of tests to determine the strength revealed that the class of concrete increased from B15 to B30 compared with the composition of the control sample.
Determination of scale coefficients for samples of autoclave structurally heat-insulating aerated concrete based on fly ash
Authors: Baranova A , Krivyh M
Published: July 2020

The article presents the results of determining the scale coefficients for autoclave structurally heat-insulating aerated concrete based on fly ash. In the course of research, the dependences of the compression strength values on the size and area of the working section of samples of autoclave aerated concrete of the grades D500 and D600 are derived. The dependences of mechanical characteristics on its average density in the range from 500 to 600 kg/m3 are established. For samples of autoclave structurally heat-insulating aerated concrete based on fly ash, the values of scale coefficients were experimentally determined, which in relation to the base sample of 150x150x150 mm are: for prisms of 40x40x160 mm – 1.45, for cubes of 70,7x70,7x70,7 mm and 100x100x100 mm – 1.2 and 0.95, respectively.
Preparation of highly selective sorbents from metallurgical wastes based on cavitation activation of sorption centers
Authors: Dubrovskaya O G , Bobrik A G , Bobrik M A , Matushenko A I , Eldarzade E A
Published: July 2020

Having analyzed the initial data of RUSAL Krasnoyarsk Aluminium Smelter, we classified 45 types of waste, determined the hazard classes and estimated annual waste accumulation to be stored and disposed of. It has been defined that 14 types of waste can be recycled and reused as constructional materials of various purposes and sorbents for industrial wastewater treatment. In this study, we subjected a lining scrap of various origin, to a complete physical and chemical analysis in order to specify the type of modification and treatment of waste, specifically lining brick scrap, in the Testing laboratory of structural materials and chemical analysis of water of the School of Engineering and Construction, Siberian Federal University, and determined the chemical composition of this waste by the X-ray fluorescence (XRF) method. We also identified the substances suitable for modification of the sorbent – the oxides of aluminium, iron, silicon, and titanium – in the optimal percentage ratio, which resulted in obtaining functional active sorbents with high technical and operational characteristics at low costs for mechanical grinding and activation.
The study of the phase composition and microstructure of composite binders using industrial waste Transbaikalia
Authors: Lkhasaranov S , Urkhanova L , Danzanov D
Published: July 2020

The further development of industry is decelerated by lack of energy resources. This is especially significant for the construction industry. Considerable energy savings can be achieved by using specially prepared raw materials. The modern complex approach to solving problems in civil engineering requires additional development of resource-saving technologies, which imply the widespread use of associated industrial products, designed to significantly reduce the energy intensity of cement and concrete production without a fundamental change in technology. The article presents the results of studies on the possibility of obtaining a composite binder using technogenic waste - fly ash and polycarboxylate type superplasticizers. It was investigated that natural pearlite and fly ash can be used as part of a multi-component fine cement. With the introduction of fly ash and superplasticizers, the technological and mechanical properties of cement change. High mechanical properties of the composite binder were obtained when the content of fly ash in the amount of 30 wt. % This is due to the structure-forming role of fly ash during Portland cement hydration. Using the method of differential thermal analysis and IR spectroscopy, it is shown that the combined use of fly ash and superplasticizer leads to a change in hydration processes, the binding of portlandite with the formation of an additional amount of calcium hydrosilicates.
On the issue of ensuring reliability of reinforced concrete structures of “northern execution”
Authors: Pinus B I
Published: July 2020

The work is devoted to the design justification of the required resource of bearing capacity of bent reinforced concrete elements of “northern execution” based on ensuring the required reliability at the time of exhaustion of the frost resistance of concrete. The dynamic model of functioning of structure in severe climatic conditions is considered as a set of static tests at individual stages of cyclic temperature and humidity effects (FTC) formed on the basis of corresponding experimental samples of strength and deformability of concrete. For the criterion for reliability of structure, it is taken the value of strength and deformability of concrete, at which its bearing capacity over a normal section has a probability of at least 99.7%. Using graphic-analytical modeling, limit (failure) values were established and correction of the normative dependency by introducing a differentiating coefficient of reliability, accounting for the level of reinforcement and design negative air temperature, was proposed. The technical and economic unreasonableness of excessive, more than 80% of the boundary, reinforcement of normal sections of bent reinforced concrete elements of “northern execution” is established.
Main achievements and directions of scientific research in the field of foundation construction on sites composed of permafrost in the Russian Federation
Authors: Rozina V E , Komarov A K
Published: July 2020

Construction in the northern construction-climatic zone associated with the solution of complex engineering problems. This is primarily the monitoring of the temperature state of the cryolithozone, which depends on a combination of climatic, engineering-geological, hydrogeological, environmental and technogenic factors. This is even more relevant in connection with the fact of degradation of permafrost. Generalized and classified technical solutions for the construction of foundations of buildings and structures built on the I and II principles. At the same time, technical audit of design solutions and scientific support during the entire life cycle of objects is required. In order to improve and implement the progressive direction in foundation construction, variants of design solutions for self-cooling freestanding columnar foundations of factory production are proposed and the work schedule is detailed.
Foam concrete production with addition of microsilica
Authors: Sherbin S A , Gorbach P S
Published: July 2020

The article deals with the influence of microsilica on technological properties of cement matrix and finished foam concrete. The possibility of replacing a part of the binder with microsilica was evaluated.
The elastic modulus for ash and slag mixtures reinforced with inorganic binders
Authors: Slobodchikova N , Rudykh A
Published: July 2020

The article analyses applications of waste produced by thermal power plants and used by the road construction industry. One of the promising areas for the use of ash and slag materials is their reinforcement with inorganic binders and using for the construction of pavement. The Russian regulatory documents governing the use of ash and slag materials have several drawbacks, including the lack of recommendations for determining the elastic modulus for bases and coatings made from ash and slag mixtures reinforced with an inorganic binder in laboratory conditions. The lack of these recommendations does not allow the selection of the mixture with specified design values of the elasticity modulus. It makes it difficult to ensure required values of the modulus of elasticity in the construction of road pavement. The authors developed a method for determining the elasticity modulus in laboratory conditions in order to produce materials with specified values of the elasticity modulus and improve quality of design and construction of road pavement from ash and slag mixtures reinforced with inorganic binders.
Perfection of technology for manufacture of heating units on the base of mica and glass
Authors: Zhytov V G , Shishelova T I
Published: July 2020

Implementation of energy saving programs, reduction of energy consumption for heating and development of efficient heating systems is a challenge. The use of resistive mica-and glass-based heaters (SKENs) is thought to be a perspective trend in this area. It is a heater of new generation that has no analogues abroad. Objective of the paper is enhancement of technologies for manufacture of resistive heaters on the base of mica and glass for improving heater’s performances. Consideration is given to development of new compositions of charge material and to treatment of its surfaces. Results of study. Technology for manufacture of SKENs with high mechanical strength and low water absorption that are widely used in different areas of building industry has been developed on the base of experimental studies and scientific generalizations.
Comprehensive optimization of water supply and sanitation systems
Authors: Chupin R V , Maizel I V , Maizel I G
Published: July 2020

Annotation. Because of the uneven distribution of water resources across the territory of our country, many localities and even cities do not have their own sources of water supply and reservoirs where it would be possible to discharge treated wastewater. To solve this problem, group and district water supply and sanitation systems are being designed, built and developed. The length of such systems is hundreds or even thousands of kilometers, and they include many pumping stations, regulating tanks, storage ponds, local and centralized treatment facilities. Significant financial investments are required annually for the construction and operation of such structures [1-6]. Therefore, the choice of routes, structure of structures, ways of transporting water and waste water, justification of the location of water intakes, treatment facilities are relevant and require special attention and technical and economic analysis of design options. The paper proposes a comprehensive approach to optimizing the structure of structures and methods for supplying water to consumers and transporting waste water to treatment facilities on the basis of the redundant design methods.
Assessment of suburbanized areas transport demand: case study of the Irkutsk Agglomeration
Authors: Zedgenizov A V , Solodkiy A I , Efremenko I
Published: July 2020

The article deals with the issues of transport services for suburbanized areas. The significance and topicality of the research are demonstrated. Various solutions to this problem in different parts of the world are described. Currently, the wealthiest strata of society are striving to obtain a higher quality of life due to the permanent residence in the suburbs which gives rise to the demand for daily commuting between the city and its suburbs. In the article this issue is developed within the context of creating a toolbox for quantitative assessment of suburbanized areas influence on the road network load, first of all, on the load of sections providing commuting between suburbanized areas and the city. The article details the sequence of selecting individual gated communities within the transport accessibility zone of the Irkutsk agglomeration; besides, the article presents a sample study of one gated community aimed at determining the number of entrances and exits. Besides, there are results of the regression-correlation analysis that allows determining an empirical dependence making it possible to estimate suburbanized territories transport demand according to their areas.
On the development of a united digital platform in the construction industry
Authors: Kudryavtseva V A , Vasileva N V
Published: July 2020

Currently, in the the world economic system, company development models are transforming. One of such transformations is active development of digitalization, which contributes to the system development and implementation of digital technologies. At the same time, digitalization is being implemented into different spheres of human life - government, economy, industry, education, construction, etc. Today the construction industry has a sufficient number of information and communication technologies which are the basis for creating digital (volumetric) models of buildings, correcting projects and managing the processes of construction and maintenance of buildings during their life cycles, including managing the engineering infrastructure of capital construction objects. The main task of digitalization of the construction industry is to create a united digital platform.
Difficulties in transforming the construction industry under the digital economy
Authors: Timchuk O G , Evloeva M V
Published: July 2020

Solving key tasks of economic growth and increasing the level of social responsibility of the construction industry require the use of the scientific and technical potential, implementation of long-term innovative development plans and programs, transformation of external conditions of investment and construction activities, adaptation of the construction management system to the digital economy. In this regard, management of structural elements of the construction industry and digitalization of the construction industry are crucial. The relevance of the research issue is due to the fact that in modern conditions, the innovative potential of construction companies is a key factor contributing to competitiveness in the market and transition to the digital economy. The object of research is construction companies operating within the market economy. The subject is organizational and economic relations taking shape in the process of development of the construction industry under the digital economy. The authors considered the problems of transition of the construction industry to the digital economy, analyzed the construction industry, and proposed their own definition of the digital economy in the construction industry. The factors that impede the development of the construction industry were described taking into account modern aspects of economic development, which makes it possible to identify areas of construction business management under the digital economy. The competences of an employee of the construction company in the context of the digital transformation of the construction industry were identified. The authors drew conclusions proving the need for the transition of the construction industry to the digital economy
Digital transformation of the Russian construction industry
Authors: Turkova V N , Archipova A N , Fedorovna Z G
Published: July 2020

Construction is an impactful industry and like everything impactful, it has to evolve with the needs and demands of the modern day consumers. The article is devoted to the analysis of the current state and prospects of development of digital technologies in construction. The fundamental concepts of digital economy, digital production and digital technologies are introduced; a peculiar “evolution” of the design process in construction is described (transition from so-called “paper-based” technologies to computer aided design systems and further to information modeling of construction objects). Construction technologies solutions and apps for the construction industry have significant growth potential, and we can nurture a cohort of new digital technology firms by supporting the development of connections with the construction industry, the broader IT sector, incubators and sources of capital. However, the largest scale impact is likely to be realised through effective implementation of BIM with the support of digital technology. Among the very topical issues raised in the article we should also highlight BIM - a fundamentally new approach in architectural and construction design, which includes creation of a computer model of a new building (structure), which carries all the information about the future of the object and is an instrument of control over its life cycle. Given the rapid pace at which new technologies and innovations are being developed, the specialization in Digital Technologies in Construction prepares graduates for the imminent, exciting and necessary, wide-scale digital transformation of the construction industry. Courses include Digital Technologies for Civil Engineering, BIM and 5D Planning, Technology and Innovation in Road Construction, Simulation and Optimization of Construction Processes and Construction Supply Chains and Digitization.
Development of a system for monitoring environmental parameters of cities and open areas
Authors: Belousov R , Nikolaev A , Fiskin E , Fiskina M
Published: July 2020

This article is devoted to the development of a system for monitoring the state of the ecological environment. The system under development should provide ongoing monitoring of environmental air parameters, both in open areas and in the city, and is designed to timely detect excess concentrations of hazardous substances in the air. A distinctive feature of the created system is high productivity at low economic costs per accounting point. An appropriate selection of the component base and software optimization of the operation algorithms will allow to achieve the maximum data transmission distance over a distance of up to 100 km in an open area. Interim results on the development of a monitoring system are presented, planned tasks for this year are indicated.