Resource and energy saving technology of specialpurpose cements

Abstract

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).