RESEARCH OF THE PROPERTIES OF THE CONTENT OF ASH AND SLAG HEAPS OF THE LADYZHYNSKAYA THERMAL POWER PLANTS TO DEVELOP THE PROCESS OF THEIR RATIONAL USE

The physical, mechanical, chemical and technological properties of various fractions of an ash-slag mixture (a residual after a coal combustion at the Ladyzhyn TPP) were studied. It has been confirmed that ash-slag mixture contains a high amount of acidic oxides, and a small amount of alkaline ones. It allows forecasting it’s high interact ability to the hydration products of Portland cement. A fine particles fraction (an ash fraction) containing the particles less than 60 microns has been obtained from the ash-slag mixture. This fraction was suggested as an effective hydraulic additive - an analogue of fly ash. The shape of the ash fraction’s particles has been determined as spherical, and it is identical to the shape of the fly ash particles. A long-term storage of the ash-slag in the dumps under water-saturated state leads to complete hydration of CaO, and MgO that eliminates the risk of uneven volume changes in the hardening concrete. It has been proven that the ash fraction of the ash-slag mixture contains over 80% of amorphous matter, which indicates a potentially high reactivity. That fraction meets the requirements of DSTU EN 450-1:2019 “Fly ash for concrete”. Thus, it can be implemented as a component of concrete and mortars. An implementation of the ash-slag mixture processing will increase the efficiency of use of fossil coal by involving its combustion products in processing, that is one of the main requirement of the resource saving concept. Bibl. 25, Fig. 3, Tab. 3.