Kostromit, a heat-insulating material based on flax chaff and waste sili-cate cellular concrete

The article discusses the use of flax chaff, a waste product of the flax processing industry, for the production of structural heat-insulating material. It is proposed to use flax chaff as part of an organomineral composition with the replacement of magnesia binder and traditional Portland cement with ground silicate aerated concrete waste and soluble sodium hydrosilicate. This approach allows obtaining a material with acceptable physical and mechanical properties — strength of 1.11–10.2 MPa; water resistance, characterized by a softening coefficient of 0.28–0.37; thermal conductivity coefficient of 0.091–0.164 W/(m ⋅ °C); and also reduce the cost of production of this composition. The use of flax chaff and aerated concrete waste in the construction industry also helps to solve environmental problems associated with the disposal of these materials.