Frost Resistance of the Walls of Buildings Made of Light Concrete

In Russia, autoclave-hardened cellular concrete blocks are actively used in frame buildings as self-supporting external walls (in some cases with external insulation), as well as in low-rise frameless construction. The operational durability of these blocks is determined by the properties of concrete and is associated with such characteristics as water resistance, capillary suction and frost resistance. The purpose of the research was to experimentally study the resistance of masonry fragments to cyclic temperature and humidity influences during unilateral freezing and to develop recommendations for assessing frost resistance. For the first time, as the normalized parameters for assessing the frost resistance of light concrete masonry, it is proposed to use the following indicators: the adhesion strength of blocks with plaster mortar, the tear strength of chemically fixed anchors (destructive methods), as well as the speed of passage of an ultrasonic pulse through the masonry thickness (non-destructive method). The physicomechanical and thermophysical characteristics of thermal insulation and structural concrete are obtained. The dependences of heat-protective qualities on the degree of moisture content of the material, as well as strength on the conditions of thawing of samples in water and in air are established. The features of conducting tests on fragments of masonry, in the process of cyclic temperature and humidity effects during unilateral freezing are worked out. The results are applicable in the development and updating of regulatory, technical, organizational and methodological documents for the design of wall masonry made of light concrete blocks, in particular, in the development of the national standard “Wall masonry made of light concrete blocks. Methods for determining frost resistance”.

I.V. BESSONOV¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.);
A.D. ZHUKOV², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
S.I. BAZHENOVA², Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.),
M.A. KONYUKHOV², Master student(This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Research Institute of Building Physics, Russian Academy of Architecture and Construction Sciences (21, Lokomotivny Driveway, Moscow, 127238, Russian Federation)
² National Research Moscow State University of Civil Engineering (26, Yaroslavskoye Highway, Moscow, 129337, Russian Federation)

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