WHAT IS AN AAC BLOCK
Autoclaved aerated concrete (AAC) blocks is a building material, which is a block of aerated concrete used for masonry of external, internal walls and partitions of buildings (GOST 21520-89 "Small wall blocks of cellular concrete"). Aerated concrete is classified in accordance with GOST 25485-89 "Cellular concretes".
According to the conditions of hardening, concretes are divided into:
Autoclaved - hardening in a saturated steam medium of 170 ° C at a pressure of at least 8 atm;
Non-autoclaved - hardening in natural conditions.
According to the method of pore formation, concretes are subdivided:
Aerated concretes - pore formation occurs due to an internal chemical reaction;
Foam concretes - pore formation occurs by adding ready-made foam to the mixture.
Aerated blocks are made of autoclaved aerated concrete. For their production, sand, lime, cement, aluminum powder and water are used. Technological processes of production include dry and wet grinding of raw materials, mixture preparation, the formation of large masses with their subsequent cutting into products of the required size. This is followed by heat and wet treatment in autoclaves at pressures up to 14 bar. Products come out of the autoclave with 100% strength. Autoclave treatment of aerated concrete allows to increase the degree of crystallization of pores, providing higher strength properties. Autoclaved aerated concrete practically does not shrink, unlike non-autoclaved aerated concrete.
The AAC block (aerated concrete) is a lightweight porous material that can be processed well with the simplest tools: drilled, sawed, planed. It has its own unique characteristics - you can easily drive nails and staples into the AAC block. Its porosity is about 85%, so the AAC block combines the best properties of wood and brick. With the help of AAC blocks, you can build a holiday house, a warm residential building. After all, the quality of AAC blocks determines the uniformity of distribution, equal volume and closure of the pores.
Choosing the right material is not such an easy task, because this is due to many factors that affect the construction of walls. First of all, these are the climate, economic indicators, architectural solutions, physical and mechanical indicators.
Environmental friendliness is also a significant factor. Environmental friendliness - only natural raw materials (cement, sand, aluminum powder, lime) are used in the production of AAC blocks. The AAC block is second to wood in its ecological characteristics and does not emit toxic substances. But, unlike wood, it does not age, does not rot and does not burn. In a house made of aerated concrete, it is easy to breathe like in a wooden house, due to its porous material structure.
The AAC block has many advantages. It block does not require treatment with toxic compounds and does not contain harmful chemical compounds. The AAC block is very popular in the Scandinavian countries and the countries of northern Europe - a confirmation of this.
The durability of the aerated block wall is more than 100 years. Now there are many houses built from AAC blocks, and they have been inhabited for about 75 years. And most importantly, these structures show no signs of destruction.
The strength of AAC blocks increases with autoclave treatment, thanks to this treatment, the AAC block acquires even more ways of implementation. Its high strength makes it possible to build 3-storey buildings and high-rise structures.
The AAC blocks have the best heat-shielding properties - they have very low thermal conductivity. That allows you to refuse additional thermal insulation and save about 20% of the money spent on heating the house. In the summer, a AAC block house does not lend itself to overheating. In addition, the AAC block is a non-flammable material, I and II degrees of fire resistance.