WALL SILICATE MATERIALS OF NON-AUTOCLAVE HARDENING WITH THE USE OF SILICA RAW MATERIALS AND ALUMINOSILICATE BINDING BASED ON NON-CONVENTIONAL CLAY ROCKS

Abstract

Among the used building materials, structural autoclave silicate products occupy one of the leading places. The traditional technology of silicate materials uses autoclave processing of products, the main disadvantage of which is the high energy intensity. In order to create non-autoclave silicate composites based on conventional siliceous raw materials, it is proposed to use a special aluminosilicate binder based on clay rocks of the incomplete stage of mineral formation of a certain genesis and quicklime. The strength of silicate materials is growing as a result of the neoplasm process. They are synthesized in the chemical reaction of quicklime with components of clay rocks when using high pressure and temperature modes in an autoclave, and when steaming with temperatures up to 100 °C. The high specific surface of the aluminosilicate binder provides an increase in the packing density of the material. Due to the structural features of the CaO-SiO2 (Al2O3)-H2O system based on unconventional clay rocks, the process of formation of the microstructure of the material, which continues and after hydrothermal treatment of the products, gives the material hydraulic properties. The proposed binders and their production technologies can be implemented in small and medium-sized businesses, which will allow to obtain competitive non-autoclave silicate materials with a compressive strength of up to 25 MPa and an average density of 1850 kg/m3.