Development of the technology of building ceramics based on fusible clays and dolomite

Thus, the search for and implementation of new technology for low-burnt composite materials presents particular scientific and practical interest. A composite material obtained by molding and firing (as a ceramic material), contains in its structure a sufficiently large amount of binder, which in hydraulic conditions may eventually form the corresponding hydrated silicate. In particular, it is noted that the clay-dolomite composite materials after burning gain sufficient strength due to the formation of silicates, aluminum silicates and aluminates of calcium and magnesium. In further steps of hydraulic hardening there were created silicates, aluminates and CaO, interacting with water, forms a hydro silicate and hydro aluminate, which plays a significant role in strengthening and shaping the structure of the clay-dolomite composites. This material has almost the same physical properties as the ceramic one burned at a temperature of 1000-1200°C. There was studied the durability of clay, dolomite composite materials. For this reason prepared samples were tested for their strength after storage under humid conditions for 30 d., 2, 4 and 6 years. It is found that the strength values of obtained materials not only do not degrade over time, but even increase after their incubation for 6 years in humid conditions. Formed structure is constantly changing with period. In order to study the changes in the phase composition after a long time there were held X-ray analysis of the samples. On radiographs of clay-dolomite compositions significant changes were not observed at the age of 2 and 4 years in the phase compositions.