The Use of Clay Shales as Active Mineral Additives for the Production of Composite Cements

A composition of composite cement with the possibility of reducing the proportion of clinker to 15% by weight on aluminosilicate rocks has been developed. The object of the study is the production of composite cement using aluminosilicate rocks of the Kazakhstan deposits - Mynaral and Kuyuk. The patterns of thermal activation processes of polymineral clays and the compositions of the products of firing active mineral additives have been established. It has been established that the clay shale of the Mynaral deposit heat-treated at 900°C has the highest activity. The qualitative and quantitative phase composition of active mineral additives, the main physical and mechanical properties of the obtained composite cements have been studied and determined. It has been established that the best strength properties are possessed by composite cements with additives of 15% of clay shales fired at 800 - 900°C.