Porous glass ceramics from siliceous rocks with the addition of magnesite

Building Materials
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Abstract:

The influence of MgCO3 in the composition of a charge of siliceous rocks, soda ash and potassium chloride on the phase composition, macrostructure and properties of porous glass-ceramic materials has been established. Samples of glass-ceramic materials were obtained by joint mechanochemical activation of components in a planetary ball mill followed by firing at a temperature of 820 °C. The effect of the amount of the additive on the phase composition of porous glass ceramics samples was established using the method of X-ray phase analysis (XRD). The developed materials have the form of blocks with a uniform fine-pored structure. With an increase in the amount of MgCO3 composition of the charge in glass ceramics, the amount of minerals diopside and combeite increases. The apparent density of the samples is in the range of 184–234 kg/m3, flexural and compressive strength is up to 1.57 MPa and 4.24 MPa, respectively, the thermal conductivity coefficient is 0.059–0.067 W/m∙°C. The developed materials are superior in many respects to foam glass and porous glass ceramics from industrial waste and can be recommended as thermal insulation in the construction of industrial and civil facilities.