X-RAY DIFFRACTION ANALYSIS OF THE SAMPLES THERMALLY ACTIVATED MIXTURES BASED ON THE MINERAL RAW MATERIALS OF THE REPUBLIC OF TATARSTAN
Currently, thermally-activated poly-mineral clays have become widely used as active mineral additives, when obtaining composite Portland cements. At the same time, complex additives based on clays and carbonates are of great importance and interest due to the wide availability of the former ones. Moreover, thermally activated clay and carbonate rock are most frequently prepared separately. At the same time, the researchers proved that thermal treatment of clay marl containing carbonates allows obtaining a more efficient pozzolanic material that is highly competitive even with burnt kaolinitic clays. In this connection, studying the products of low-temperature solid-phase synthesis is of research and practical interest in terms of searching for and obtaining the new efficient complex additives to composite Portland cements based on poly-mineral clays and carbonate rocks. This paper represents the findings of the x-ray diffraction analysis of thermally activated mixtures based on the poly-mineral clay in the field deposit of the Republic of Tatarstan and two types of carbonate rocks containing 99 and 87 % of calcite. We have analyzed the products of the solid-phase thermal synthesis of the mixtures obtained. The findings obtained have allowed us to identify the qualitative composition of and to calculate the quantitative composition of the products of the solid-phase temperature synthesis of the thermally activated mixtures. The x-ray diffraction analysis findings have confirmed the formation of di- and monocalcium silicates and monocalcium aluminate in the artificial mixtures of clay and carbonate rocks, obtained by thermal treatment and containing 99 and 87 % of calcite. We have also shown the efficiency of using poly-mineral clays and carbonate rocks in obtaining complex additives by thermally activating of artificial mixtures.