Today, more than 500,000 homes are made of cellular concrete. The oldest are from 1934. Indeed this material, very light, cuts easily and has an insulating property (from 30 cm thick) making the implementation of reported insulation unnecessary. In addition, it combines high resistance to compression as well as shock absorbing blows without bursting.
This material is born in university laboratories.
First, in 1880, when the German engineer W. Michaelis managed to create a water-resistant and light calcium silicate.
Then in 1889, another engineer, E. Hoffmann, invented a mortar from this first material.
The story continues in 1914 when the Americans J. W. Aylsworth and F. A. Dyer introduce aluminum and zinc powder to evacuate any trace of water.
Finally, it was in 1924 in Sweden that A. Eriksson, a Stockholm researcher, completed the development of the material by improving the compression of the elements in a high-pressure autoclave.
The cellular concrete then becomes a real industrial product.
In 1929, the Swedish firm Ytong distributes elements cut into blocks.
Redeemed by the German company Xella, the latter improve the formula, eliminating for example the shrinkage due to the drying of which they shorten the time considerably.
It was in 1958 that the different sizes of cellular concrete blocks were standardized.
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