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Heat-resistant ferrochrome slag based concrete
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Journal Article
Heat-resistant ferrochrome slag based concrete
2014
Overview
In the construction materials industry, expensive refractories (fire clay, silica, high-aluminous, etc.), are used as the main lining materials which despite their high fire resistance are inefficient for the use in thermal aggregates with an operation temperature up to 1300 °C. The purpose of the research was to develop heat-resistant concrete on the basis of sodium silicate binder and liquid glass with application of ferrochrome slag. Studies on the use of ferrochrome slag to obtain heat-resistant concrete are quite limited. It is common to apply self-scattered ferrochrome slag as a hardener when liquid glass is used. Carbonaceous ferrochrome slag is used when getting sodium silicate binder and as a filler together with other fire-resistant materials. Therefore, development of low-component heat-resistant concrete, which contains in the binder and filler the same raw materials with uniform-phase structure, represents a certain scientific and practical interest. On the basis of carbonaceous ferrochrome slag, sodium silicate binder and heat-resistant concrete with uniform-phase structure have been developed. Also a heat-resistant concrete mix has been developed with an application of liquid glass and without any special hardener. Curing of concrete on sodium silicate binder was carried out by drying in the range of temperatures of 100-200 °C, curing of concrete on liquid glass was done with drying in the range of temperatures of 105±5 °C. Compression strength of concrete on sodium silicate binder after drying was 26.2 MPa, compression strength of concrete on liquid glass was 25.8 MPa.
