CONCRETE

[:ru]Грановский А. В.[:] [:ru]канд. техн. наук, ЦНИИСК им. В. А. Кучеренко[:]

[:ru]Киселев Д. А.[:en]Kiselev D. A.[:] [:ru]инж., ЦНИИСК им. В. А. Кучеренко[:en]Engineer, Central Research Institute of Building Structures (CNIISK, named after V.A. Kucherenko)[:]

Alitinform №1 (13) 2010 г. 84-91 p.

Abstract

As of today, there is a heavy deficit of cellular concrete of good quality. Because of a shortage of qualitative products, consumers have to purchase concrete manufactured by primitive methods of work (it is referred to non-autoclave cellular concrete and aerated concrete). Application of cellular concrete variants in a form of small-sized blocks in self-supporting walls, with separations by floors, for residential and public buildings, in the absence of proper control of their strength and density, leads to wide-scale usage of aerated concrete blocks, for example, with the strength between B0.5 and B1.5, and density below D 500. Aforementioned problem has become the most challenging one in connection with attachment of bearing substructures of facade systems to walls made of such materials, and with installation of metal reinforcing bonds in two- or three-layer walls.

We would like to notice that in 1982 experts from several research institutes issued the State Standard GOST 25485-82 that clearly divides cellular concretes, depending on a class of concrete and its density, onto the following types: structural, structural and heat-insulating, and heat-insulating concrete. «Recommendations for application of small-sized wall blocks from cellular concretes»”, issued in 1992 by experts from CNIISK named after V. A. Kucherenko, NIIZhB (Research Institute of Reinforced Concrete) and LenZNIIEP (Leningrad Zonal Research Institute of Experimental Design), had prohibited the use of cellular concrete blocks of the grade below M 25 (B 1.5) and with density lower than D 500 for self-supporting walls.