Introduction. In Ukraine, about 30 % of all electricity is generated from the combustion of solid fuels — coal, shale, peat. In our country, there are about 15 operating thermal power plants that generate about 5 – 6 million tons of ash and slag waste per year as a secondary product. Thus, the fuel and energy complex waste generated in the furnaces of thermal power plants is a huge accumulation of ash in the form of dusty residues and lumpy sludge, as well as various ash and slag mixtures. These products of high-temperature processing (1 200 – 1 700 ºС) of the mineral part of the fuel are widely used in many countries of the world and, given the global trend towards an increase in 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.
Problem Statement. The road construction industry is one of the strategic industries of Ukraine, and the issue of quality and availability of basic building materials for road construction is particularly acute now, which is directly related to its high material intensity. The known reserves of high-quality raw materials that could be used as asphalt concrete components are constantly decreasing, so it is necessary to look for alternative sources of raw materials for construction materials and explore the possibility of their use. In this regard, the most effective use of local raw materials is the use of industrial waste, which can be one of the solutions to the problem of lack of raw materials of inorganic origin.
Objective. This study was devoted to the comparison of aggregates of different origin on the technological properties of asphalt mixtures.
Materials and methods. Mineral filler from limestone and fly ash was used for the study.
Results. The residual porosity of asphalt concrete samples was determined by the calculation method and it was found that asphalt concrete with fly ash obtained after 69 turns of the gyratory compactor has a lower residual porosity than asphalt concrete with limestone aggregate, which indicates the possibility of reducing the bitumen content in asphalt concrete with fly ash.
Conclusions. The use of fly ash in asphalt concrete is a promising solution, as it reduces the negative environmental impact on the environment, reduces the cost of ash waste storage, while ensuring high quality road pavement.
The development and modernization of road infrastructure is of strategic importance for Ukraine's economic growth and competitiveness in the region. The use of the investigated materials in road construction will reduce the extraction of conditioned natural materials and reduce the harmful impact of waste on the environment.
