bluuebunny/crossref_metadata_2025_split huggingface dataset:
On issue of equivalence of methods of accelerated aging to natural by example of modeling climate impacts by freeze-thaw cycles
Authors: Erofeev A V , Mikhaylov V A 
Published: December 2019

Abstract
In this paper, the problem of establishing a correlation dependence between the actual operating conditions and accelerated aging of the material in the laboratory is set. As an example, the material considered is penoplex working in the system of ventilated façade for establishing the dependence of the selected strength in transverse bending. To find out the impact of climatic factors on the properties of the penoplex, a special stand was installed, which was operated in the conditions of the Tambov region for one year. As an accelerated aging, three alternate freeze-thaw schemes were considered. The schemes differed in the duration of soaking and freezing of the sample. The obtained results allow us to assert that various freeze-thaw simulation schemes lead to various changes in the characteristics of the material and before starting the simulation in each case it is necessary to establish an equivalent relationship.
Production technology of ceramic roof tiles based on raw materials of Ural region
Authors: Pavlova I A , Kutasheva S S , Farafontova E P 
Published: December 2019

Abstract
The technology of production of ceramic roof tiles on the basis of low-melting red-burning clay, namely on the basis of clay from the Sadovoye deposit of the Sverdlovsk region, is proposed. The samples of ceramic roof tiles, molded by plastic and semi-dry way, were obtained with the properties that meet the requirements of Russian standards and correspond to the quality of the Röben ceramic roof tiles. The water absorption of such products is 6.2–6.9%, the apparent density is 2.19–2.31 g/cm3, the products are waterproof for more than 4 hours, and withstand frost resistance for more than 150 cycles. The production technology involves the use of high-speed firing way in the temperature range of 1150–1200°C. The production technology provides for grinding the clay to a grain size of less than 0.3 mm. Molding of products can be done both in a plastic or semi-dry way. The use of high-speed firing is allowed. There is no destruction of products made on the basis of Sadovoye deposit clay.
Structural and thermal insulation products based on vegetable raw materials
Authors: Smirnova O E , Pichugin A P 
Published: December 2019

Abstract
The author of the article addresses the issues of obtaining insulation products based on flax shives. The article suggests a systematization method for the flax shives based materials, which takes into account the principle of obtaining construction materials based on flax processing waste on various types of binders. It is based on the literature data and the existing research. The possibility of using flax shives as a large structure-forming aggregate of concrete is determined along with the composition and properties of organic aggregate - flax shives. The article presents the optimal ratios selection of flax and binding bonfires in the preparation of granular materials. The characteristics of granulated aggregates on the basis of flax shives are given. The manufacture of cob granules was carried out in two technological ways: on a complex binder and on mineral binders with “dusting” with portland cement. The the method involving the coating of granules with a cement shell was used to produce a granulated material with higher rates of adhesion to the hardened stone of mineral binders in the concrete composition. The technological parameters of the granulation process are determined for two technological methods.
Porous filler from foam-zeolite and light concretes based on it for conditions of the Arctic and the North
Authors: Mestnikov A E , Fedorov V I 
Published: December 2019

Abstract
Vitreous porous aggregates and light concretes based on them undoubtedly have a great future in construction in the harsh conditions of the North and the Arctic. This article presents the results of experimental studies of the properties of similar porous aggregates and light concretes based on them, produced for the first time during semi-production tests from zeolite-containing rocks of the Khonguruu deposit in the Republic of Sakha (Yakutia). It has been established that porous fillers made of foam rubber with a density of 150-300 kg/m3 have a rather high strength of 1.0-3.9 MPa. It is shown that with the optimal selection of the composition and fractions of granules of GFG there is a real possibility of obtaining a class of concrete B2.5 and B3.5 for low-density structural and heat-insulating concrete D500 and D600, thermal conductivity coefficients under operating conditions A are 0.14 and 0.16 W/(m×K), respectively. Such characteristics of a new type of lightweight concrete make them competitive with traditional wall materials such as wood concrete, expanded clay foam concrete, cellular concrete, etc.
Ultra-disperse modifying zeolite-based additive for gypsum concretes
Authors: Egorova A D , Filippova K E 
Published: December 2019

Abstract
Under modern construction conditions it is important to find the ways of cost reduction without deteriorating physical&mechanical properties of construction materials and their environmental properties. That is why the construction materials on the basis of the gypsum binder remain competitive and the increase of their operation properties is one of the relevant today tasks. In this paper the authors presented a way of increasing water resistance and strength of gypsum concrete by adding ultra-disperse modifying zeolite-based additive from available raw materials. The authors find out zeolite grindability and its chemical composition. The ultra-disperse modifying zeolite-based additive is a paste dispersed in water and added into a concrete mix as water solution. When 14% of the additive is included in gypsum paste the softening factor grows from 0.31 to 0.84 while the grade strength increases by 30%, the ultimate compression strength of dry samples - by 2.5 times and amounts to 30 MPa. Studying physical&mechanical properties and the micro-structure of gypsum&concrete samples proves the efficiency of using the developed ultra-disperse modifying zeolite-based additive.
Lime slag binding agent for road concrete
Authors: Voronin K M , Permyakov M B , Davydova A M 
Published: December 2019

Abstract
The article shows the comparative analysis of two compositions of cement concrete to use in road construction. In order to compare quality characteristics of the materials the method of Y.M. Butt was used that was implemented to test Portland cement samples made at Magnitogorsk cement refractory plant and cement rock on the basis of lime slag binding agent that was developed based on blast-furnace granulated slag together with Magnitogorsk Metallurguc Plant, PJSC. Computational and full-scale experiments were conducted to forecast the time changes of qualitative parameters of road surfaces with slag. It was established that its endurance to the first and second type of corrosion is higher. It was proved that lime slag concrete can be used in the production of road fine grain concrete instead of Portland cement, the presented binding agent also proved to be more economically feasible.
Neural network modeling of concrete bond strength to reinforcement
Authors: Yartsev V P , Nikolyukin A N , Korneeva A O 
Published: December 2019

Abstract
All the loss of bond strength of concrete to reinforcement is the main reason for loss of bearing capacity of a reinforced concrete structure. That’s why it is necessary to study the changes of bond strength of concrete to reinforcing bar by the influence of various factors. In addition, the mechanical characteristics of concrete change due to external and technological impacts. Making up an analytical model using artificial neural networks (NN), which allows determining the final bond strength through the mean values of shearing stress is considered in the article. The object of research is concrete of different strength classes, reinforced with steel and fibre-reinforced plastic rebar. The subject of study is the change in the value of bond strength of concrete to reinforcement after alternating freezing and thawing. It was found that the value of adhesion is associated with the strength characteristics of concrete and the type of reinforcement used. Also, a two-layer NN with reverse signal propagation was developed, which accurately describes the value of bond strength of concrete to reinforcement.
Program implementation of methodology for calculating and estimating residual life of frame of single-storey industrial building
Authors: Zolina T 
Published: December 2019

Abstract
The paper presents a description of the software and calculation complex that allows evaluatng the reliability, strength and stability of load-bearing structures of industrial buildings equipped with overhead cranes. It is built on the implementation of a consolidated algorithm aimed at the numerical solution of successively direct, inverse, and predictive problems of structural mechanics in a probabilistic formulation. The advantage of the complex is the possibility of forming for each design situation a large number of downloads, as well as the implementation and analysis of various schemes for their application with simultaneous action of components of the generalized load. The developed software and calculation complex acts as a tool for solving problems of computer processing of data obtained during a series of full-scale surveys of an industrial building equipped with bridge cranes aimed at determining the amount of residual life and the period of its trouble-free operation. Automating the calculation of indicators of reliability and durability in the dynamics of changes in their values, including in subsequent periods of operation of the facility, it becomes possible to predict emergencies and take timely measures to prevent them.
Impact of weld seams and connected elements parameters on stress concentration
Authors: Shuvalov A N , Emel’yanov O V , Kovalev M G 
Published: December 2019

Abstract
Existing construction regulations use durability estimations in nominal stress to ensure structural parameters of building elements. The maintenance time factor is only indirectly accounted for by load safety and service factors. Decreasing the number of accidents and minimising the damage caused by them leads to need of reliability and durability prediction for structural elements that go through cyclic loads. To make a reasonable choice regarding the sizes of constructive forms (due to concentration zones) of such elements, deformation criteria of fracture should be used. This makes it possible to account for kinetics of local elastoplastic deformations, with one-time and cyclic loads. Nowadays, dependencies connecting concentration coefficients of elastoplastic pressure and deformations with a concentration coefficient for elastic stress have been found. This article presents the results of change in elastic stress concentration coefficient around the heel and toe in zones of the fracture of gusset plates and from the frontal angles depending on their structural parameters (width and thickness of the angle’s shelf, thickness of gusset plate, length and cathetus of weld) based on the research on stress strain behavior of rods of the T-section from paired equilateral angles using the finite element method.
Notes for calculated resistance to tension for laminated wood
Authors: Labudin B V , Popov E V , Nikitina T A 
Published: December 2019

Abstract
Wood as a material with sharply expressed anisotropic properties fully transfers them to glued wood. Depending on the force vector under tension along, across and at an angle to the fibers, it differ tenfold. The results of studies of laminated wood tensile at different angles to the orientation of the fibers are given. The results of calculations are determined with testing of standard samples fordesign strength according to the method of ALTI–CNIISK. It is established that the angle between fiber orientation and vector of the applied force αis influenced a lot bythe tensile strength and depends on the sort of wood. The value of tensile strength is decreased when the angle vary from 0 to 90°. Experimental values are compared with theoretical results which are given in current standards –Rules and Norms 64.13330.2017 “Wooden structures”. The difference between theoretical and standard results is 4 … 70%. More accurate approximating expressions of experiments are presented, which can be used in practice instead of formula (6) from Rules and Norms.
Strengthening bridge spans by composite materials
Authors: Makarov A V , Rekunov S S 
Published: December 2019

Abstract
The modern effective method of reinforced concrete bridge superstructures reinforcement using composite materials is considered. The results of comparative analysis of physical and mechanical properties of materials used to strengthen the bridge spans that have received defects and damage during their operation are presented. The results of the performed analysis of experimental studies of building structures reinforced by similar methods are shown. Various options of fixing carbon lamellas on the surfaces of reinforced structures are investigated. An alternative method of fixing the carbon lamella using the anchor device, devoid of shortcomings of existing technical solutions, is proposed. The principle of operation of the proposed anchor device operating on the principle of tightening bar is described in detail. The article describes technological operations in strengthening the reinforced concrete beam of automobile and road bridge. Construction solutions of the organization of nodal connections are shown.
Factors determining characteristics of crack resistance of concrete structures
Authors: Varlamov A A , Davydova A M , Gavrilov V B 
Published: December 2019

Abstract
Despite the fact that concrete and reinforced concrete are the main construction materials, to date there is no complete theory of deformation and destruction. Structural concrete is considered at the level of macrostructure, has a number of features that do not allow you to directly transfer some of the provisions obtained for homogeneous materials. Available experimental data on the resistance of the concrete crack propagation relate mainly to the laboratory samples. In the paper, a new method for obtaining the fracture mechanics parameters of concrete, which is one of the most promising areas of research of fracture of composite materials. The study investigates the characteristics of cracks at different parameters of the segment breaks off. The study was carried out on finite element models. The authors studied the influence of the tilt angles formed by the segment on the stress state at the tip of the crack. In addition, the research separately considered the changes in mechanical properties of a break-off segment. As a result, the authors built regression tables and graphs. In conclusion, the research provides recommendations for the implementation of a shape for the break-off segment.
Use of modern technology of information modeling in capital construction object life cycle management
Authors: Maleeva T , Selyutina L , Frolova N 
Published: December 2019

Abstract
The urgency of the topic is determined by the problems and prospects for the development of information modeling technology in the Russian construction industry. Modern information modeling technologies provide new opportunities in assessing the efficiency of project management. The main problems related to the implementation of the building information modeling system at the operational stage have been described and characterized. The paper shows that information modeling technologies, being the foundation of digital construction, allow creating an integrated informational space in a single place and inseparable in time of use, as well as collecting and systematizing all object data, and making an information management process as efficient as possible.
Design of organizational and industrial relations in the renovation of urban areas
Authors: Topchiy D , Lapidus A 
Published: December 2019

Abstract
This article presents a study of links in organizational and technological structures and information support in construction control in the Russian Federation and other countries, including Great Britain, the USA, Germany, etc. It describes particular features of interconnection between the Customer and the General Contractor in construction product quality management abroad and substantiates the need for development of an automated design system of construction quality management. The structure of the state construction supervision in Russia at the objects of industrial and civil purposes is presented. The features of conducting Supervisory activities in construction are revealed, as well as the main aspects of such activities are presented. The article describes in detail the differences between the implementation of supervision and construction control on capital construction projects. The main issues arising in the performance of construction quality control are formulated.
Psychological support of fly-in/fly-out labour for construction companies working in Far North
Authors: Berseneva M , Vasilovskaya G , Danilovich E 
Published: December 2019

Abstract
The paper focuses on the methods of selecting personnel for work shifts at the construction enterprise in the extreme conditions of the Far North. The paper attempts to suggest ways of staff psychological support during the selection of candidates. Methods and means of psychological support of the adaptation period of shift workers are proposed, based on the analysis of changes in the level of efficiency and the psycho-functional state of the staff when working shifts in the severe northern region. Further recommendations are given on the application of methods to improve the process of adaptation to extraordinary living conditions at various stages of a shift work period. The paper investigates and determines the dependence of the efficiency of personnel on such indicators as the time of adaptation to shift work conditions with intense physical exertion, temperament, physical qualities, psycho-emotional state and age of candidates. The methods of teaching personnel self-control skills are proposed, the main components of psychological support for staff adaptation are highlighted. In conclusions, the main risk groups when selecting candidates for senior positions of personnel working shifts in the conditions of the Far North are identified.
On the competitiveness of a construction project
Authors: Filimonova L A , Skvortsova N K 
Published: December 2019

Abstract
As studies have shown, the ability to involve mechanisms for the efficient use of the resource potential to ensure the maximum possible reduction in the energy intensity of production, including through the development of new energy-saving technologies in modern economic conditions, determine the competitiveness of products (enterprise, region, country). The article considers the concepts of “energy efficiency” and “energy saving”; highlighting key problems of increasing energy efficiency at the level of Russian enterprises. It also substantiates the importance of the transition to energy efficient technologies in accordance with the principles of the International Standard ISO 26000 “Guidelines for Social Responsibility” in the development of design and estimate documentation for the investment projects. The paper characterizes energy efficiency as a key factor in the competitiveness of products (enterprise, region, country), quantifying the effectiveness of energy-saving measures and influence of energy efficiency on the level of competitiveness of the enterprise.
Experience of reconstructing deferrization station
Authors: Govorov O , Zubareva O , Govorov V 
Published: December 2019

Abstract
We conducted analysis of the currently functioning deferrization station. We demonstrate that in some cases stations built in 1950-60-s became obsolete, and technology based on simplified aeration followed by filtration does not ensure required quality of purified water at all times. Moreover, this article provides an example which justifies the development of tech solutions for the reconstruction of the deferrization station. We propose an introduction of new technology with bioreactors and filters with a floating load, use of technological pipelines from non-laminated polyvinyl chloride and energy-saving fittings. Results show that concentration of iron in purified water after the reconstruction does not exceed 0.075-0.084, manganese - 0.025-0.028 mg/l, turbidity is less than 1 FTU, chromaticity is less than 2.8 degrees. Total energy consumption comprises 0.96 kW per hour.
Purifying wastewater from dairy plant
Authors: Strelkov A K , Teplyh S Yu , Bystranova A O 
Published: December 2019

Abstract
Currently, there is a widespread expansion of existing and construction of new enterprises of the dairy industry. Sewage of dairy enterprises is characterized by a high concentration of pollution, their purification being a complex technical and scientific task. Current sewage treatment facilities do not meet the relevant standards, as a rule. This fact disrupts the municipal treatment facilities work significantly and leads to environmental pollution. Flotation and coagulation purification methods as well as their effectiveness in the application of dairy industry enterprises drains are considered. The problem of wastewater treatment of the food industry enterprises is largely related to the extraction of fats. An experimental study to determine the concentration of fat at different stages of treatment by gravimetric and IR spectrophotometric methods was conducted.
Compact groundwater treatment units
Authors: Govorova Zh , Semenovykh V , Medvedeva V 
Published: December 2019

Abstract
This thesis is dedicated to a systematic approach when choosing appropriate groundwater treatment technologies with regard to specific water consumers’ requirements. The groundwater analysis indicated that iron compounds were the main pollutants which could be found in biominerals, manganese, solution gases etc. This study represents the research results of compact groundwater treatment units which use nonchemical biological deferization methods and applied ozone treatment technologies. As the result, it was demonstrated that the source water with hydrogen-sulfide odor, 6.8 mg/l of iron content, 46 degrees of chromaticity and pH up to 7.6 was successfully treated in compliance with the statutory requirements. The authors also study wash water sediment structure and composition.
Vacuum consolidation for construction of motor road embankments in peat soil
Authors: Nikitin A 
Published: December 2019

Abstract
One of the efficient methods to accelerate primary filtration consolidation of peat is vertical draining combined with vacuuming.
This article presents the results of laboratory analysis of vacuuming impact onto the peat deformation rate in the bases of motor road embankments. It demonstrates that the duration of peat vacuuming increases and its efficiency decreases with the increase of pressure exerted by surcharge sand layer.
The results of compression tests have shown that relative peat deformation after vacuum consolidation is 0.24…0.37; this means the deformation rate of the road base in the course of operation will be significantly lower.
The effect of vacuum consolidation on peat settlement rate during motor road embankment construction was assessed by numerical simulation in PLAXIS software, which enables accounting for consolidation and creep processes in motor road base courses. The results of numerical simulation were used to compare the efficiency of preloading the peat using surcharge sand with the efficiency of vertical draining combined with vacuuming, considering the allowable embankment settlement rate during motor road operation. Due to a low settlement rate, the vacuum consolidation method ensures normal road operation and allows increasing the maintenance interval.