Development of concrete compositions based on aluminochromite cements

Abstract

Compositions of high-strength refractory concretes based on aluminochromite cements with various aggregates have been developed, which are characterized by high performance: compressive strength at the age of 28 days of hardening – 49 – 56 MPa; open porosity – 10.9 – 11.6%; fire resistance – 1800 – 2000 ° С; heat resistance 1300°C – water – more than 25 thermal cycles; the temperature of the beginning of deformation under a load of 0.2 MPa – 1510 – 1560 ° C; thermal coefficient of linear expansion – (8.4 ÷ 11.6)∙10–6 K–1; the degree of softening in the temperature range 20 – 1000°C – 11.4 – 17.6%; slag and metal resistance (according to the penetration depth) for the alkali blast-furnace slag – 2 mm, for the metal melt – none.