Resource and energy saving technology of specialpurpose cements

By obtaining and studying special‐purpose building materials based on the wastes of various industrial fields it has been found that that they exhibit a complex of predefined properties, and are both hydraulic and air binding materials. Physico‐mechanical properties of such materials vary over a wide range: water‐cement ratio – 0.12 – 0.25; initial set – from 50 minutes to 1 hour 50 minutes, final set – from 2 hours 15 minutes to 3 hours 25 minutes; compressive strength after 3 days of setting – 30 – 60 MPa, compressive strength after 28 days of setting – 50 – 85 MPa. In addition, experimental materials exhibit a complex of special properties: computed mass absorption ratio 200 – 280 cm^‐1, sulfate resistance ratio after 6 months of setting in aggressive medium – 1.1 – 1.2. It is possible to obtain the following materials from chemical industry wastes: sand lime bricks (silicon‐containing wastes), heavy fillers for special purpose concretes (chromium wastes), various types of ceramics (calcium‐containing wastes), and in particular ferromagnetic ceramics (barium‐containing wastes).