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DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

DURABILITY OF THREE-LAYERED WALLS WITH BRICK FACING THAT PROVIDES HIGH THERMAL PROTECTION

Vestnik MGSU 1/2013
  • Umnyakova Nina Pavlovna - Scientific and Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (NIISF RAASN) +7 (495) 482-39-67, Scientific and Research Institute of Building Physics of the Russian Academy of Architecture and Construction Sciences (NIISF RAASN), 21 Lokomotivnyy proezd, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 94-100

The author examines possible reasons for the fracturing of external three – layered walls that have an efficient insulation of the thickness of 120 — 150 mm. The external wall layer is made of bricks. A comparative analysis of the temperature distribution inside the walls has demonstrated that the full-depth frost penetration into the brick facing of the wall that has 120 mm insulation occurs when the outside temperature is below –1 °C. However, the same effect occurs when the outside temperature is below –3 °C in respect of walls that have 50 mm insulation.If the average monthly temperature pattern, particularly the autumn one, is taken into consideration, in the event of the average November temperature of –2.2 °C the chance of full — depth wall freezing is higher if the insulation layer is thicker, and lower, if the insulation layer is 50 mm thick. The analysis of average monthly temperatures and ranges of their fluctuations has revealed that full-depth wall freezing lasts for 6 months, if the insulation layer is 120 mm thick, and if the insulation layer is thinner, the effect lasts only for 4 months. These calculations have proven that the thicker the insulation, the higher the temperature deformations and temperature stresses within the outside brick layer. These effects accelerate the fracturing of three — layered walls.

DOI: 10.22227/1997-0935.2013.1.94-100

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