Gas-and foam concrete

In order to introduce air into the concrete mixture, substances are used that are able to swell aqueous cement solution. But as a gas former, a special aluminum powder is mainly used, which reacts with a hydrate of calcium oxide, forms a swelling mixture, but to obtain it, you must use a special construction tool. The use of foam and gas former allow foam concrete and aerated concrete. Such concrete will have low thermal conductivity, so they are widely used in the construction of low -rise buildings. The negative property of gas-and foam concrete is low moisture resistance. And when moisture hits, an increase in the thermal conductivity of the material, as well as a decrease in the strength of the strength. And if the moisture remains inside the concrete, and the cold season will occur, then the water will freeze, which is in the pores, as a result of which concrete destruction occurs. If you are building a low -rise building from such a material, then it is worth choosing only the material that will be reliably protected from moisture — saturated with a moisture protection composition or plastered with cement plaster. To carry out the plastering of the facade, you need to use only cement plaster, but to carry out internal work, the plaster "Volma-layer" is used