Low-cement fireclay castable with improved performance

The paper presents the results of developing low-cement fireclay concrete based on kaolin chamotte. As a result, concrete with the highest application temperature of up to 1500 °C was obtained. The use of narrow fractions of chamotte with low (less than 5%) water demand ensures the production of low-cement concrete with high rates of mobility of the concrete mixture. The research focused on the influence of the additions of sodium tripolyphosphate, reactive alumina and superplasticizers based on naphthalene and polycarboxylate on the spreadability of the concrete mixture and the basic heat-resistant properties of concrete. The use of sodium tripolyphosphate most contributes to the sintering processes of cement stone in concrete. The developed heat-resistant concrete is characterized by high compressive strength (more than 50 MPa after the first heating to operating temperatures) and heat resistance (at least 20 water heat cycles).