In harsh environments, such as Siberia, houses should be built of cold-resistant materials. But for their production of high-quality raw materials is necessary. If it is not present in the region, the bricks for the building to be brought from the neighboring regions. Researchers from the University of Bratsk in the Irkutsk region have developed additives that improve the quality of local rock zakarbonizirovannogo loam, and make it suitable for the production of cold-resistant bricks. Supplements derived from waste wood chemical and metallurgical industries, and therefore virtually worthless.
Ceramics made of zakarbonizirovannogo loam has a low strength. Researchers have proposed organomineralnymi supplement that by firing reinforces the inner walls of the cavities of the ceramic product, and also binds calcium and magnesium oxides contained in the loam. As the mineral component used byproduct urban ferroalloy — dust, consisting of silicon oxide doped with carbon and metal oxides. The organic component saponified fatty acid — a by-product that is formed during kraft pulping. Another option — used as the organic component of the coal dust.
Researchers ceramics samples produced with different contents complex additives and their mechanical properties are investigated. They demonstrated that the use of both additives brick reduces the density (due to the organic burnout parts) and the resulting cavity improve its insulating properties. Durability bricks made from silt zakarbonizirovannogo without additives, decreases the saturation of the material with water. Ceramics are manufactured by using organic-additive in water-saturated state becomes stronger.
"It appears that under these conditions the formed mineral phase (calcium silicates and aluminosilicates) capable of hardening hydrate. When moisture is their hydration and hardening of the walls of the pores in the material — the authors explain. — This is confirmed by the results of tests on frost resistance, which recorded an increase of material strength after 50 cycles of freezing and thawing in a water-saturated state. "
The authors note that the implementation of their proposed method for ceramic enterprises will not only increase frost resistance of bricks, but also reduce the environmental tensions in the region, since it will get rid of 4,000 tons of dust — a byproduct metal production.