STUDY OF THE PROPERTIES OF ASH-REMOVAL OF DIFFERENT ORIGIN TO COMPLY WITH NATIONAL REQUIREMENTS

Abstract

Introduction. In Ukraine, about 30% of all electricity is produced by burning solid fuels - coal, shale, and peat. In our country, there are about 15 operating thermal power plants, which generate about 5-6 million tons of ash and slag waste as a secondary product per year. Thus, the waste of the fuel and energy complex, which is formed in the furnaces of thermal power plants, is a huge accumulation of ash in the form of dust-like residues and lumpy sludge, as well as various ash-slag mixtures. These products of high-temperature processing (1200-1700 ºС) of the mineral part of the fuel are widely used in many countries of the world, and taking into account the global trend of increasing the share of the secondary market for the use of waste, it is necessary to predict an increase in the rate of their processing in Ukraine as well. Problems. In Ukraine, as a filler, the material obtained by crushing carbonate rocks is used as a filler, which is established in DSTU B B.2.7-121. At the same time, as a result of burning coal, millions of tons of dust-like waste - fly ash - are generated at power-generating enterprises of Ukraine. The grain composition of this material approaches the filler requirements according to DSTU B V.2.7-121 and can be used for the production of asphalt concrete mixtures. The purpose of the work is to establish the possibility of using fly ash of various origins for the production of asphalt concrete mixtures. Materials and methods. Fly ash of various origins was used during the research. The results. It has been established that these materials meet the requirements of DSTU B B.2.7-121 according to all the specified indicators in accordance with the non-activated mineral powder of the I brand. Conclusions. Conducted studies on determination of grain composition, porosity, swelling and structuring ability showed that the studied fly ash meets the requirements of table 5 of DSTU B B.2.7-121, and the indicators are close to limestone mineral powder.