HEAT-RESISTANT CELLULAR CONCRETE AND BINDING MATERIALS ON THE BASIS OF ALUMINOTHERMAL SLAG

Abstract

The paper presents the basic results of works on production of alumina binders on the basis of
alumina cement, aluminothermal slag produced in Kluchevsky Ferroalloy Plant, modified additives
based on polycarboxylate ether (PCE), as well as heat-resistant cellular concrete on their basis.

The use of aluminothermal slag is conditioned by high concentration of Al2O3 and a relevant phase
constitution. The superplasticizing admixtures based on PCE are added to the binding material in
order to compensate a decrease in strength properties caused by introduction of slag. The influence
of these additives on processes occurring in hydration of the binding material is described. The
phase composition of hydration products is studied by methods of physical and chemical analysis
(derivatography, X-ray phase analysis). It’s shown that at 3–7 days of hardening the admixtures
based on PCE facilitate amorphization of new formations slowing down the hydration. The optimal
proportion of superplasticizers on the basis of PCE is specified. The main properties of the developed
binders are examined. The heat-resistant cellular concrete is obtained on the basis of these
binding materials.