Porous glass ceramics from opoka, soda ash and corrective additives

Foam glass and foamed glass-ceramic materials have a number of unique properties. They are chemically resistant, light, durable, do not burn, do not transmit heat and sound well, etc. They are used both in private construction and in the construction of specially responsible facilities. The article confirms the possibility of using flask as a raw material for the production of porous glass ceramics (PSK) in one charge heating by powder foaming. Flask, soda ash and corrective additives (chalk, clay) were ground together in a dry state, poured into heat-resistant molds and fired. The temperature ranges of sintering and foaming of the charge based on the flask, the effect of additives on the macrostructure and properties of porous glass ceramics have been established. The results were obtained by thermal analysis (TA), X-ray phase analysis (XFA), etc. Chalk and clay in the composition of the charge have a significant effect on the temperature of its sintering and foaming during heating, as well as the phase composition of the UCS samples. As a result, samples with a finely porous structure in the form of blocks of 500×500×200 mm in size with an average density from 190 kg/m³to 1535 kg/m³, compressive strength from 2 MPa to 116 MPa and with a thermal conductivity coefficient from 0.06 W/m°C to 0.61 W/m°C.

Porous glass ceramics based on flasks, soda ash and corrective additives (chalk, clay) surpass many analogues in terms of physical, mechanical and thermal properties and can be used as structural, thermal insulation and other types of building materials during construction, repair and reconstruction of facilities for various purposes.

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