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High-Effective Lightweight Aggregate Obtained from Glass-Containing Waste

Number of journal: 12-2020
Autors:

Mammadov H.N.,
Suleimanova I.H.,
Tahirov B.M.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-66-71
УДК: 666.972.125

 

AbstractAbout AuthorsReferences
The properties of high-strength artificial porous aggregate from glass-containing waste of metallurgical productions are described. The developed technology makes it possible to expand the raw material base for the production of aggregates for light concrete. Granulated slags of metallurgical productions – the main (M0>1) slags of the Novokuznetsk Iron and Steel Plant and acid (M0<1) slags of the Gorky plant are studied. According to the results of studies, it was found that the optimal swelling interval for acidic slags is 1000–1100оC, and for basic slags-1100–1150оC. A high – strength artificial porous aggregate-slag gravel with a bulk density of 340–780 kg/m3 and a compressive strength in the cylinder of 2.8–12.3 MPa was obtained. The main physical and mechanical properties of the resulting aggregate, which meets the requirements of the current standard GOST 9757–90 “Gravel, crushed stone and sand. Artificial porous”, were studied. The aggregate obtained is almost twice as strong as the known aggregate of expanded clay gravel. With the use of porous gravel and sand, light concrete of strength class B7,5–B40 and a density of 1100–1600 kg/m3 was obtained.
H.N. MAMMADOV, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
I.H. SULEIMANOVA, Ph. D (This email address is being protected from spambots. You need JavaScript enabled to view it.),
B.M. TAHIROV, Researcher (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Research and Design Institute of Building Materials named after S.A. Dadashov (67, Fizuli Street, Az 1014, Baku, Azerbaydgan)

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For citation: Mammadov H.N., Suleimanova I.H., Tahirov B.M. High-effective lightweight aggregate obtained from glass-containing waste. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 66–71. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-66-71

Discharge-pulse Geotechnical Electro Discharge Technology of Bases Strengthening

Number of journal: 12-2020
Autors:

Sokolov N.S.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-63-65
УДК: 624.15

 

AbstractAbout AuthorsReferences
The problem of increasing the bearing capacity of the base is an relevant problem in modern geotechnical construction. When significant loads are transmitted to the base, the use of traditional technologies is not always justified. Often there is an urgent need to use non-standard ways to strengthen the bases. In many cases, the geotechnical situation is aggravated by the presence of weak underlying layers with unstable physical and mechanical characteristics in engineering-geological sections. When strengthening such bases with the help of traditional piles, the latter can get negative friction, which significantly reduces their bearing capacity on the ground, sometimes reaching zero values. This may lead to additional precipitations of the objects being constructed and constructed in the zone of geotechnical influence. The use of ERT piles in most cases successfully solves many complex geotechnical problems.
N.S. SOKOLOV1, 2, Candidate of Sciences (Engineering), Director(This email address is being protected from spambots. You need JavaScript enabled to view it., This email address is being protected from spambots. You need JavaScript enabled to view it.

1 I.N. Ulianov Chuvash State University (15, Moskovsky Prospect, Cheboksary, Chuvash Republic, 428015, Russian Federation)
2 OOO NPF “FORST” (109a, Kalinina Street, Cheboksary, Chuvash Republic, 428000, Russian Federation)

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For citation: Sokolov N.S. Discharge-pulse geotechnical electro discharge technology of bases strengthening. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 63–65. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-63-65

Design of Steel Structures in Seismic Conditions

Number of journal: 12-2020
Autors:

Olfati R.S

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-58-62
УДК: 699.841

 

AbstractAbout AuthorsReferences
The principles of designing earthquake-resistant steel frames of industrial buildings are considered. Particular attention is paid to the causes of damage to steel frames due to seismic loads impact, as well as the requirements that must be met when designing steel frames in seismically active areas. The most suitable materials that can be used to strengthen the steel frame, because of its correct operation relative to the resulting seismic loads have been studied. The analysis of loads calculated according to the normative documents of Russia and other countries of the world, and their comparison with each other are presented. An overview of possible experimental methods for determining the strength of the frame under seismic loads is given, as well as a critical assessment of the regulatory documents used, namely the formulas and coefficients used, and alternative solutions are proposed. The influence of soil on the strength parameters of the steel frame under seismic load, as well as the influence of own vibrations and forms of the structure on the pliability of the bases, were studied. Promising design solutions for steel frames in the event of earthquakes are indicated. The experience of designing earthquake-resistant structures abroad was studied and the materials of past accidents in Russia and other countries of the world were analyzed.
R.S. OLFATI, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Peoples’ Friendship University of Russia, Department of Construction, Engineering Academy (6, Miklukho-Maklaya Street, Moscow, 117198, Russian Federation)

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For citation: Olfati R.S. Design of steel structures in seismic conditions. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 58–62. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-58-62

Temperature Effects on Polymer Structures of Canopies for Inversion Roofs of Multi-Storey Residential Buildings

Number of journal: 12-2020
Autors:

Malbiev S.A.,
Fedosov S.V.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-52-57
УДК: 699.868

 

AbstractAbout AuthorsReferences
The influence of temperature effects on the technical condition of cross-rod spatial structures of canopies for inversion roofs of multi-storey residential buildings made of polymer materials is considered on the example of tubular elements made of polyvinyl chloride (PVC). For modern multi-storey residential buildings, the current regulatory and technical documentation provides for operational (inversion) roofs, which can accommodate children’s sports grounds, cafes, bars, restaurants, parking lots, tanning salons, as well as gardens and architectural and landscape objects, helicopter platforms, etc. To protect visitors against atmospheric influences, canopies made of spatial core building structures (SCBS), which are operated in the open air, taking into account various climatic influences: high and low temperatures, corresponding humidity, precipitation, etc., are recommended. The elements of the core system are of the greatest interest for taking into account the temperature impact on the technical condition of the developed structure. The general solution of the problem of non-stationary heat transfer of a structure for calculating a two-dimensional temperature field is considered in a nonlinear formulation. The problem of thermal conductivity is considered under the assumption that there is a technical possibility for supplying a coolant inside the cylinder. As a result, there is a heat flow, with which it is possible to adjust the temperature between the outer and inner areas of the cylindrical elements for more efficient installation of the stress-strain state of the entire supporting structure as a whole.
S.A. MALBIEV1, Candidate of Sciences (Engineering), Leading researcher;
S.V. FEDOSOV2, Doctor of Sciences (Engineering), Academician of RAASN (This email address is being protected from spambots. You need JavaScript enabled to view it.)

1 “Engineer-Story” NPP LLC (office 103, 15a, Krasnykh Zor’ Street, Ivanovo, 153003, Russian Federation)
2 National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

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8. Fedosov S.V. Teplomassoperenos v tekhnologicheskikh protsessakh stroitel’noy industrii: monografiya [Heat and mass transfer in the technological processes of the construction industry: monograph]. Ivanovo: IPK “PressSto”. 2010. 364 p.
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11. Fedosov S.V., Malbiev S.A. Structural structures made of polymeric materials for coating buildings and structures with a chemically aggressive environment. Part 2. Non-stationary heat transfer. Vestnik grazhdanskikh inzhenerov. 2018. No. 6, pp. 25–29. (In Russian).
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For citation: Malbiev S.A., Fedosov S.V. Temperature effects on polymer structures of canopies for inversion roofs of multi-storey residential buildings. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 52–57. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-52-57

Innovative Energy-Saving Sandwich-Panels for Industrial Construction

Number of journal: 12-2020
Autors:

Nikolaev V.N.,
Stepanova V.F.,
Mikhailova A.V.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-47-51
УДК: 691.328.4:620.193

 

AbstractAbout AuthorsReferences
Today, large-panel housing construction occupies a leading position, both in terms of construction speed and sales, which contributes to an increase in the volume of precast concrete housing construction. Outdated series of large-panel houses do not meet modern requirements. Old faceless panel houses are gradually replaced by beautiful housing complexes with different types of facades. At present, in the technology of construction of panel houses from sandwich-panels, the relevant trend is to reduce the standard thickness of the facade layer of a three-layer sandwich-panel (GOST 31310–2015 “ Three-Layer Reinforced Concrete Wall Panels with Effective Insulation. General Technical Conditions”) from 70 mm to 40 mm or less. Panel houses require a reduction in metal consumption, material consumption and improvement of thermal characteristics. This requires the development and implementation of new materials. The use of such construction products made of composite materials as diagonal flexible composite connections, flexible mounting loops and composite reinforcement mesh will make it possible to reduce the thickness of the protective layer of concrete without compromising the stability of the structure under the influence of the external environment due to the high corrosion resistance of the composite, reduce the weight of the panel, reduce the cost of manufacturing a unit of panel, increase the energy efficiency of the panel, ensure long-term strength of enclosing structures – create an innovative energy-efficient reinforced concrete sandwich panel of the XXI century.
V.N. NIKOLAEV1, Director (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.F. STEPANOVA2, Doctor of Sciences (Engineering);
A.V. MIKHAILOVA1, Marketer

1 CJSC “The Republican Chamber of Entrepreneurs” (4, Kombinatskaya Street, Cheboksary, Chuvash Republic, 428008, Russian Federation)
2 JSC Research Center of Construction, Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev (6, bldg. 5, 2nd Institutskaya Street, Moscow, 109428, Russian Federation)

1. Babkov V.V., Kolesnik G.S., Gajsin A.M. Bearing external three-layer walls of buildings with high thermal protection. Stroitel’nye Materialy [Construction Materials]. 1998. No. 6, pp. 16–18. (In Russian).
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11. Stepanova, V.F. Protection of concrete and reinforced concrete structures from corrosion – the basis of ensuring the durability of buildings and structures. Promyshlennoe i grazhdanskoe stroitel’stvo. 2013. No. 1, pp. 13–16. (In Russian).
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For citation: Nikolaev V.N., Stepanova V.F., Mikhailova A.V. Innovative energy-saving sandwich-panels for industrial construction. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 47–51. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-47-51

Press- Formed Composites with Alternate Wetting and Drying Resistance Based on Modified Gypsum Binder

Number of journal: 12-2020
Autors:

Kaklyugin A.V.,
Kastornykh L.I.,
Stupen N.S.,
Kovalenko V.V.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-40-46
УДК: 691.311

 

AbstractAbout AuthorsReferences
Water resistance of natural and artificial building materials is usually estimated by the softening coefficient. However, in the course of operation, materials, for example, for building enclosing structures, are rarely subjected to complete dewatering or water saturation. Therefore, one of the most important criteria for the durability of such products is their resistance to atmospheric influences (alternate wetting and drying resistance). In the present work, the possibility of increasing the alternate wetting and drying resistance of press-formed composites based on a modified gypsum binder is studied. We have developed a complex modifier of the gypsum binder and the structure of the resulting pressed composites, consisting of carbonate-containing slime of chemical water purification of thermoelectric power station and monoammonium phosphate. We studied the effect of the modifier on changes in the compressive strength of pressed composites in the dried and water-saturated state, softening and atmospheric durability coefficients, as well as linear deformations of control samples after a set number of cycles of alternating wetting and drying. We found that press-formed composites based on a modified gypsum binder are highly resistant to alternating wetting and drying. The complex modifier provides the formation of a more solid and monolithic structure of fine-crystalline calcium sulfate dihydrate, additionally reinforced with a hardly soluble phosphate-carbonate framework. The proposed method of modifying the gypsum binder prevents loosening of the structure of the press-formed stone-like material made from it under alternating stresses, reduces linear deformations and, as a result, slows down its fatigue failure. The technical characteristics of the obtained materials are sufficient for their use, in particular, in building enclosing structures.
A.V. KAKLYUGIN1, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
L.I. KASTORNYKH1, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
N.S. STUPEN2, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.V. KOVALENKO2, Senior lecturer (This email address is being protected from spambots. You need JavaScript enabled to view it.)

1 Don State Technical University (162, Sotsialisticheskaya St., Rostov-on-Don, 344022, Russian Federation)
2 Brest State A.S. Pushkin University (21, Kosmonavtov bul., Brest, 224016, Belarus)

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For citation: Kaklyugin A.V., Kastornykh L.I., Stupen N.S., Kovalenko V.V. Press-formed composites with alternate wetting and drying resistance based on modified gypsum binder. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 40–46. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-40-46

Modifiers for Rigid Polyvinylchloride Compositions of Building Purpose

Number of journal: 12-2020
Autors:

Abdrakhmanova L.A.,
Khuziakhmetova K.R.,
Nizamov R.K.,
Khozin V.G.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-34-39
УДК: 691.175.743

 

AbstractAbout AuthorsReferences
A comparison of small doses (up to 0.7 mass part) of impact strength modifiers of foreign and domestic production in polyvinylchloride-based compositions is given. Domestic acrylic-nitrile-butadiene styrene modifiers (ABS) were used. The developed shock-resistant polyvinylchloride compositions in the presence of ABS elastifier have high melt fluidity, which has a beneficial effect on the recyclability. Changes in supramolecular structure were estimated from thermomechanical testing and electron microscopy data for both unfilled and filled PVC samples. Thermomechanical analysis showed that the presence of ABS modifier had a favorable effect on the technological properties of PVC-based samples. Electron-microscopic images indicate that in unfilled PVC samples, the heterogeneous PVC structure is expressed in the presence of ABS copolymer in comparison with foreign acrylic modifiers. When the compositions are filled with micro-heterogeneous structure in dispersion medium, the filler-polymer is formed by chalk particles, while ABS elasticifier is at the phase interface. Due to the peculiarities of the structure ABS has a higher degree of “fixation” on the surface of the chalk particles in comparison with the basic compositions containing acrylic modifiers, which with increasing chalk concentration leads to lower wear and tear on the top of the forming equipment.
L.A. ABDRAKHMANOVA, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
K.R. KHUZIAKHMETOVA, Graduate Student (This email address is being protected from spambots. You need JavaScript enabled to view it.),
R.K. NIZAMOV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.G. KHOZIN, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Kazan State University of Architecture and Engineering (1, Zelenaya Street, Kazan, 420043, Russian Federation)

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For citation: Abdrakhmanova L.A., Khuziakhmetova K.R., Nizamov R.K., Khozin V.G. Modifiers for rigid polyvinylchloride compositions of building purpose. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 34–39. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-34-39

Calculation of the Composition of Granular Charges for Decorative Wall Ceramics

Number of journal: 12-2020
Autors:

Akst D.V.,
Stolboushkin A.Yu.,
Fomina O.A.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-25-33
УДК: 666.74:666.3.016

 

AbstractAbout AuthorsReferences
It has been shown the necessity of using a multicomponent charge in modern technologies of building ceramics, that caused by a number of reasons, including the usage of low-grade natural and technogenic raw materials, and the relevance of its rational selection, considering the chemical and mineralogical composition of the charge components. The results of the study of the chemical, granulometric and mineral composition of the coloring technogenic raw materials are presented: gas cleaning dust from the manganese alloys production, slag from ferrovanadium smelting and a slime part of the waste from iron ores enrichment. A perspective direction for the creation of ceramic-matrix composite materials and a developed model for the formation of a frame-painted structure of composites, which allows the usage of technogenic color modifiers for volumetric staining, are noted. The basic provisions of the developed mathematical calculation method of the granular charge composition for obtaining ceramics with frame-painted structure are considered. A model of a multilayer granule with different layered raw materials distribution is shown. The summary data of the calculation for different charge compositions and the main calculation indicators are given. The results of approbation of the calculation method on the example of manganese- and vanadium-containing technogenic raw materials for the formation of two- and three-component granular mixtures are presented. Experimental samples of decorative ceramic bricks with matrix structure were obtained in the factory. It has been substantiated and experimentally confirmed a pronounced change in the color of fired products with the use of a coloring technogenic additive with a reduced content of chromophores.
D.V. AKST1, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
A.Yu. STOLBOUSHKIN1, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
O.A. FOMINA1, 2, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

1 Siberian State Industrial University (42, Kirova Street, Novokuznetsk, 654007, Russian Federation)
2 Mechanical Engineering Research Institute of the RAS, (4, Maly Kharitonievsky Side street, Moscow, 101990, Russian Federation)

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For citation: Akst D.V., Stolboushkin A.Yu., Fomina O.A. Calculation of the composition of granular charges for decorative wall ceramics. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 25–33. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-25-33

About the Development of Brick-Design in Russia

Number of journal: 12-2020
Autors:

Bozhko Yu.A.,
Lapunova K.A.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-21-24
УДК: 692.23

 

AbstractAbout AuthorsReferences
The article reflects the authors view on the technical and aesthetic side of the use of face bricks in the architecture of our country. The term brick design combines such indicators of brickwork as the color, size and surface of the brick itself, as well as the type of masonry and seam parameters. Unfortunately, the analysis of the current situation shows that the culture of consumption of face bricks in Russia remains at a low level, which is due to the lack of proper knowledge and insufficient number of qualified master masons. The main goal of brick design development is to popularize various types of three-dimensional masonry and reveal the potential of using bricks as a basic unit. The comparison shows the architecture of European cities, which does not differ in the complexity of architectural forms, but has advantages in the form of unusual masonry, color combinations, vertical direction of masonry and other elements of technical aesthetics. The use of bricks in various levels of brick design will allow you to avoid using architectural decoration on the facades of buildings, while preserving its authenticity and individuality. The brick, as a basic unit, is self-sufficient and is able to fulfill not only its functional role, but also its aesthetic one. In this situation, a necessary and decisive action will be competent communication with industry specialists, architects and designers, leading manufacturers and technologists who realize that we have a unique material that does not need additional wrapping when used efficiently.
Yu.A. BOZHKO, Engineer (This email address is being protected from spambots. You need JavaScript enabled to view it.),
K.A. LAPUNOVA, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Don state technical University (1, Gagarina Square, Rostov-on-Don, 344000, Russian Federation)

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For citation: Bozhko Y.A., Lapunova K.A. About the development of brick-design in Russia. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 21–24. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-21-24

Color Assessment of Facing Brick by UV-VIS-NIR Spectroscopy

Number of journal: 12-2020
Autors:

Shchikaltsova V.I.,
Platov Yu.T.,
Rassulov V.A.,
Platova R.A.,
Romanova E.Yu.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-16-20
УДК: 666.714:535.92

 

AbstractAbout AuthorsReferences
Diffuse reflection UV-VIS-NIR spectroscopy was used to study changes in the color of facing bricks from the content of the additive of manganese tetraoxide (Mn3O4) into the ceramic mass. This investigation was shown that with an increase of the additive content, both the intensity of the absorption bands of colored bricks corresponding to hematite decreases, and the absorption intensity increases with a shift in the maximum of the wide absorption band from the visible to the near-infrared range of the spectrum. By changing the values of the color coordinates in the CIE L*a*b* and Mansell systems: lightness and color, and the values of the indicator-relative color ability, it is fixed that the color of a brick depends on the ratio of two pigments: yellowish-red of hematite and black, probably jacobsite in its composition.
V.I. SHCHIKALTSOVA1, Chief Technologist (This email address is being protected from spambots. You need JavaScript enabled to view it.);
Yu.T. PLATOV2, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
V.A. RASSULOV3, Doctor Sciences (Geology and Mineralogy) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
R.A. PLATOVA2, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
E.Yu. ROMANOVA2, undergraduate student (This email address is being protected from spambots. You need JavaScript enabled to view it.)

1 “Gzhel brick plant” JSC (140156, Moscow region, Ramenskiy district, settlement Gzhel)
2 Plekhanov Russian University of Economics (117997, Moscow, Stremyanny lane, 36)
3 All-Russian Scientific-Research Institute of Mineral Resources named after N.M. Fedorovsky (119017, Moscow, Staromonetny lane, 31)

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For citation: Shchikaltsova V.I., Platov Yu.T., Rassulov V.A., Platova R.A., Romanova E.Yu. Color assessment of facing brick by UV-VIS-NIR spectroscopy. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 16–20. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-16-20

Russian Market of Ceramic Bricks. Development Trends and Prospects

Number of journal: 12-2020
Autors:

Semenov A.A.

DOI: https://doi.org/10.31659/0585-430X-2020-787-12-4-5
УДК: 339.13:666.712

 

AbstractAbout AuthorsReferences
The article provides information about the state and main trends in the development of the Russian market of ceramic bricks. Data on the structure of construction of residential buildings based on the wall materials used are presented, and the regional structure of demand for ceramic bricks is estimated. The forecast of market development in 2021–2022 is presented. It is noted that from the end of 2018, the pace of housing construction in Russia increased significantly due to the transition from mid-2019 to financing through escrow accounts and the rejection of EPA (Equity Participation Agreement). The positive dynamics continued in 2019–2020, which was additionally associated with a reduction in the Central Bank’s key rate, the introduction of a preferential mortgage program in 2020, and the implementation of programs to support the construction complex in the context of the COVID-19 pandemic. As a result, the production of ceramic bricks increased by more than 3% in 2019 and by about 2% in the first 9 months of 2020. At the same time, it was found that due to unfavorable market conjuncture, the number of ceramic plants operating in Russia has significantly decreased (from 557 in 2014 to 310 in 2019)
A.A. SEMENOV, Candidate of Science (Engineering), General Director (This email address is being protected from spambots. You need JavaScript enabled to view it.)

LLC “GS-Expert” http://www.gs-expert.ru/

For citation: Semenov A.A. Russian market of ceramic bricks. Development trends and prospects. Stroitel’nye Materialy [Construction Materials]. 2020. No. 12, pp. 4–5. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-787-12-4-5

The Method of Calculation of Building Structures by Reliability Level

Number of journal: 11-2020
Autors:

Belentsov Yu.A.

DOI: https://doi.org/10.31659/0585-430X-2020-786-11-54-59
УДК: 624

 

AbstractAbout AuthorsReferences
The analysis of the problem of calculating the bearing capacity of structures, taking into account the guaranteed level of reliability and failure-free operation, was carried out. On the basis of the works of N. N. Streletsky, A. R. Rzhanits and others, “bottlenecks” are established that do not make it possible to design structures with a guaranteed level of reliability and failure-free operation, despite the introduction of the concept of strength class and the existing reliability theory. According to the failure-free operation indicator, a scheme for normalizing the reliability of designed building structures is proposed and is interrelated with the assessment of the quality of structures being built. Guaranteed design quality indicators with a set probability of failure-free operation that are not related to strength are introduced: geometric dimensions, modulus of deformation and elasticity, taking into account the variability of properties and technology. The corresponding reserve coefficients ensuring the required probability of failure-free operation are determined. The scheme for calculating the design of structures with the required level of reliability is developed in the process of design, construction and operation of structures, taking into account the completeness and reliability of information on the results of quality control, during operation, taking into account the reduction of physical, mechanical and other properties of structures.
Yu.A. BELENTSOV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Petersburg State Transport University of Emperor Alexander I (9, Moskovsky Avenue, 190031, Saint Petersburg, Russian Federation)

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For citation: Belentsov Yu.A. The method of calculation of building structures by reliability level. Stroitel’nye Materialy [Construction Materials]. 2020. No. 11, pp. 54–59. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2020-786-11-54-59