It is customary to call aerated concrete an artificially created stone, one of the most famous types of cellular concrete. As reported in http://khsm.com.ua/gazobeton this unique building material got its name because of the spherically closed non-communicating air pores equally distributed throughout the concrete volume.
Aerated concrete production
Aerated concrete is created from quartz sand and cement with the addition of special gas "formers" (for example, finely dispersed aluminum). In addition, gypsum or lime can be added to the batch for aerated concrete blocks, as well as various industrial (including metallurgical) wastes such as ash or slag.
The ingredients are mixed in water, after which the gas-forming reaction of aluminum with a highly alkaline cement (and in some cases - lime) mortar is initiated. The blank for the future material is immediately poured into molds. And already there hydrogen gas is formed - it is he who foams the cement.
Upon preliminary setting, aerated concrete is taken out of the molds, cut into blocks, slabs of the desired shapes, panels. And then sent to the autoclave. There, strong steam sets the required super strength to the products. However, in some industries the material is dried in electrically heated chambers. Therefore, experts divide aerated concrete into:
- autoclave;
- and non-autoclave.
Classification of aerated concrete
Aerated concrete is classified according to a number of characteristics:
1. According to its purpose, it can be:
- constructional;
- thermal insulation;
- or structural and thermal insulation.
2. By component composition, this material is divided into consisting of:
- calcareous;
- cement;
- slag-ash;
- and mixed binders;
- natural materials (finely ground quartz or any sand);
- secondary product industrial waste.
From the history of the creation and improvement of aerated concrete
This material was invented by the Czech Goffman, who received the corresponding patent in 1889. Next, the Americans Dyer and Aulsworth acted, adding zinc and aluminum powders to aerated concrete. The Swedish architect Ericsson improved the basic composition of aerated concrete, achieving better swelling. In 1929, the Swedes ("Itong" company), using the technology of heat and humidity exposure of the German professor Michaelis, began industrial production of the material.
