Ivashchyshyn H. Low-carbon blended cements and modified concretes and building mortars on their basis

The dissertation is devoted to solving the problem of obtaining eco-efficient concrete and mortars due to the development of low-carbon cements, which are obtained by blending Ordinary Portland cement (CEM I) with active mineral additives of various types related to supplementary cementitious materials. The advantages of such cement systems are the high level of energy saving and the low CO2 emissions of cement production combined with the high durability of concrete on their basic. It has been shown that the combined pozzolanic additives thanks to optimizing the material and particle size distribution can be a dedicated component in the production of efficient concretes or mortars. It is noted that during the pozzolanic reaction between high-activity superzeolite and micro silica, lowcalcium fly ash with calcium hydroxide stimulate the processes of formation the hydration phases in the intergranular space and the compaction of the microstructure of the cement matrix. It and combination with additives of plasticizing and air-entering action provides the technical&technological effect and eco-economic efficiency.