DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

USING SMALL CELLULAR CONCRETE BLOCKS TO MAKE BEARING WALLS OF MID-RISE BUILDINGS

Vestnik MGSU 1/2013
  • Malakhova Anna Nikolaevna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Scienc- es, Associate Professor, Department of Reinforced Concrete Structures, Department of Archi- tectural and Structural Design; +7 (495) 287-49-14, ext. 30-35; +7 (495) 583-07-65, ext. 17-65., Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Balakshin Andrey Sergeevich - Stroitel’no-tekhnicheskiy kontrol’ Limited Liability Company Candidate of Technical Sciences, General Director; +7 (495) 926-07-07, Stroitel’no-tekhnicheskiy kontrol’ Limited Liability Company, Mytishchi, Moscow Region, Building 19, 50 Olimpiyskiy prospect.

Pages 87-93

The authors argue that bearing walls of buildings that have up to four stories can be designed and made of small cellular concrete blocks. These walls demonstrate advantages specific to solid masonry walls. For example, they have high water vapor permeability. Whenever the internal humidity increases, half of the moisture content can be extracted from the masonry due to the water vapour permeability of external walls, while the other half of the moisture content can go back into the room (due to the sorption capacity of the wall material). Furthermore, any lower density wall material has smaller heat absorption capacity to ensure a comfortable environment.The application of small cellular concrete blocks as a wall material is an alternative to thoroughly insulated multi-layer external walls. The authors present options of structural solutions of external walls of buildings.It is noteworthy that due to the relatively low strength of cellular concrete, walls have a low bearing capacity. Cellular concretes are brittle.Control tests of small cellular concrete blocks made in the natural environment do not always prove the desired compressive strength. In addition, strength properties of small cellular concrete wall blocks may vary. The authors present their findings in terms of their examination of the technical condition of mid-rise buildings that have walls made of small cellular concrete blocks. The authors consider the reasons for the defects of walls made of small cellular concrete blocks.

DOI: 10.22227/1997-0935.2013.1.87-93

References
  1. Glikin S.M. Sovremennye ograzhdayushchie konstruktsii i energoeffektivnost’ zdaniy [Modern Envelope Structures and Energy Efficiency of Buildings]. Moscow, 2003, 57 p.
  2. Ditrikh Kh. Povyshenie nadezhnosti konstruktsiy zdaniy pri modernizatsii [Improvement of Reliability of Structures of Buildings through Modernization]. Moscow, 1993, pp. 60—69.
  3. SNiP II-22—81*. Kamennye i armokamennye konstruktsii [Construction Norms and Rules II-22—81*. Masonry and Reinforced Masonry Structures]. Moscow, 2007, 40 p.
  4. Posobie po proektirovaniyu kamennykh i armokamennykh konstruktsiy (k SNiP II-22—81) [Manual of Design of Masonry and Reinforced Masonry Structures (based on SNIP II-22—81)]. Moscow, 1987, 152 p.
  5. Rekomendatsii po primeneniyu stenovykh melkikh blokov iz yacheistykh betonov [Recommendations for Use of Small Wall Blocks Made of Cellular Concrete]. Moscow, TsNIISK im V.A. Kucherenko publ., 1992, 58 p.

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FACADE SYSTEM MADE OF POROUS MATERIALS

Vestnik MGSU 5/2012
  • Zhukov Aleksey Dmitrievich - Moscow State University of Civil Engineering (MSUCE) Candidate of Technical Sciences, Professor, Department of Technology of Finishing and Insulation Materials, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Chugunkov Aleksandr Viktorovich - Moscow State University of Civil Engineering (MGSU) Director, Department of Examination of Buildings, postgraduate student, Department of Technology of Finishing and Insulation Materials, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 128 - 132

The proposed multi-component façade system is made of porous concretes employed both as bearing structures and for heat insulation and fireproofing purposes. The authors also provide their recommendations in respect of the mounting of the proposed façade system.
The façade system considered in the article is composed of wall foam concrete blocks reinforced by basalt fibers (bearing elements of the structure), cellular concrete polystyrene (thermal insulation), and porous concrete (fireproofing and thermal insulation). Retained shuttering (in the fireproofing sections) represents chrysolite cement sheets attached to the structures composed of glass-fiber plastic elements.
The application of insulating porous concrete as a fireproofing material is based on the principle of adjustable stress-strained states of materials in the environment of variable pressure. This technology was developed at Moscow State University of Civil Engineering, and it was initially designated for the manufacturing of tailor-made products. The above concrete is also designated for retained shuttering and modified cavity masonry walls. Porous concrete that expands inside the fireproofing cavity ensures a tight contact both with the basic material and thermal insulation plates. The use of materials of the same origin (Portland cement) means the formation of strong transition zones connecting the system components in the course of its hardening and further operation.
The results of the thermotechnical calculation demonstrate that the thermal resistance registered on the surface of the wall that is 3 meters high (that has a 0.4 m fireproofing cavity) is equal to 3.98 sq. m. C/Wt. The value of the coefficient of thermotechnical heterogeneity (r) is equal to 0.86 with account for the thickness and thermal conductivity of point and linear elements. If the thermotechnical heterogeneity is taken into consideration, the thermal resistance of the proposed wall is equal to 3.42 m2 С/Wt.

DOI: 10.22227/1997-0935.2012.5.128 - 132

References
  1. Bobrov Yu.L., Ovcharenko E.G., Shoykhet B.M., Petukhova E.Yu. Teploizolyatsionnye materialy i konstruktsii [Thermal Insulation Materials and Structures]. Moscow, Infra-M Publ., 2010, 268 p.
  2. Zhukov A.D., Chugunkov A.V., Rudnitzkaya V.A. Reshenie tehnologicheskikh zadach metodami matematicheskogo modelirovaniya [Resolution of Process-related Problems by Mathematical Modeling Methods]. Moscow, MSUCE, 2011, 176 p.

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