Authors: A.V. Uglyanitsa, V.В. Duvarov

Title of the article: Heat insulation of the lining of underground structures with structural geopolysterol concrete

Year: 2022, Issue: 2, Pages: 64-74

Branch of knowledge: 25.00.22 Geotechnology (underground, open and construction)s

Index UDK: 624.1 : 699.865

DOI: 10.26730/1999-4125-2022-2-64-74

Abstract: It is proposed to carry out heat insulation of the lining of open trench underground structures with monolithic, block or slab heat-insulating structural polystyrene concrete. Taking into ac-count the fact that during operation the heat-insulating shell of the lining of an underground structure is subjected to pressure from higher soils and surface structures, as well as the fact that a polystyrene concrete mixture in the Russian Federation often has to be laid in winter, laboratory experimental studies were carried out to determine the composition and technology for preparing a special heat-insulating and structural geopolystyrene concrete with increased compressive strength and the possibility of its laying under negative temperatures. The devel-oped heat-insulating and structural geopolystyrene concrete of medium density grade D300 and compressive strength grade B1.0 has a number of advantages compared to PenoplexGEO expanded polystyrene foam, which is often used for insulation of underground structures: it is 5 times stronger, twice cheaper and withstands three times more freeze and thaw cycles. In addition, the increased strength of geopolystyrene concrete in comparison with PenoplexGEO expanded polystyrene allows insulating the lining of underground structures under conditions of increased pressure from soil and surface structures, and increased frost resistance allows extending the life of the insulation when located at a depth of soil freezing. In addition, a strong heat-insulating shell made of geopolystyrene concrete, being a supporting structure, makes it possible to reduce the bearing capacity and thickness of the lining of an underground structure and, as a result, reduce the total cost of a lining with a heat-insulating shell.

Key words: underground structure heat insulation lining polystyrene concrete strength frost resistance

Receiving date: 03.03.2022

Approval date: 30.03.2022

Publication date: 29.04.2022

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