Development of autoclaved aerated concrete brick in the world

Before World War II, autoclaved aerated concrete was mainly concentrated in the Nordic countries: Sweden, Norway and Finland. The Second World War seriously hindered the development of autoclaved aerated concrete and stagnated the new industry with good development momentum. Until the end of the Second World War, autoclaved aerated concrete with energy-saving advantages was developed again due to the global energy shortage.

 

In the 1950s, Western Europe, Eastern Europe and the former Soviet Union successively introduced the production technology of autoclaved aerated concrete, improved the production process, and emerged a number of patented technologies.

 

Around the world, more than 60 countries have set up factories to produce autoclaved aerated concrete, which are distributed in cold zone, temperate zone and tropical zone. The main technologies include YTONG technology and siporex technology in Sweden, Hebel technology in Germany, Unipol technology in Poland and durox technology in the Netherlands Technology and Denmark's stema technology.

 

Germany has become the technical center of autoclaved aerated concrete. The production of autoclaved aerated concrete around the world is mainly concentrated in the factories owned by haibol company and Yitong company.

 

At present, Wehrhahn, Masa, hess-stoke and aircrete of the Netherlands have innovated their own technical equipment on the basis of the above technologies and introduced them to the Chinese market.

 

Because autoclaved aerated concrete has excellent thermal insulation and energy-saving characteristics, its advantages are very obvious in cold areas. Therefore, the countries that used autoclaved aerated concrete as thermal insulation building materials earlier in the world are mainly concentrated in northern Europe, Eastern Europe and Western Europe, and later developed in Asia and other regions represented by Japan and the former Soviet Union. Poland is a severe cold region, with a higher latitude than Heilongjiang in China, and the requirements for building energy conservation are higher than Beijing. Therefore, more than 50% of the walls use autoclaved aerated concrete; Germany uses autoclaved aerated concrete to produce light blocks to build double-layer walls with air layer, so as to meet the requirements of thermal insulation and energy saving. At the same time, it is also widely used in firewall boards; Since the 1950s, autoclaved aerated concrete has developed rapidly in Japan, and now it is gradually becoming the main position of wall materials. 72% ~ 76% of the external walls of Japanese buildings use autoclaved aerated concrete strips, of which residential buildings use more, accounting for 51% ~ 56% of the total. Because autoclaved aerated concrete has alkaline environment, the United States also uses it as a retaining wall behind the target in the weapon shooting range, Reducing the pollution of lead to Groundwater provides environmental protection materials for military training in the United States.