Synthesis of refractory foam concrete based on Portland cement for use in structures of special construction facilities

Refractory foam concrete based on Portland cement has been developed for use in special construction facilities. The targeted synthesis of heat-resistant foam concrete is based on the complete binding of portlandite into heat-resistant phases due to the introduction of finely ground ceramic additives. The resulting material meets the specified physical and mechanical characteristics: grade D700 for average density, compressive strength class B 1.5, maximum permissible application temperature class I6 (600 °C) and thermal conductivity 0.15 W/(m·°C). A unique property is the negative coefficient of thermal expansion, which provides the material with compensation for thermal deformations of metal structures without destruction. The formation of heat-resistant phases is confirmed by physico-chemical analysis methods (DTA and XFA).