Abstract
This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B. The knowledge of the mineralogical material composition is important because the type of minerals directly determines the properties of the fly ash and slag and their possible application. Laboratory tests showed that ash and slag samples consist of the following minerals: amorphous materials, quartz, feldspar, mullite, melilite, cristobalite, haematite and calcite. The fly ash and slag chemical properties are the most important indicators in the evaluation of their suitability as a building material. The ash and slag chemical composition is composed of the following chemical components: SiO2, Al2O3, Fe2O3, CaO, MgO, SO3, S, Na2O and K2O. Results of laboratory tests show that fly ash and slag have variable chemical, mineralogical and physical properties that are dependent on the natural composition, quality of coal from basin, the manner of combustion and place of ash deposition.
Highlights
Fly ash is the product of burning coal and arises from inorganic substances melting in the thermal power plants
This paper describes the physical, chemical and mineral properties of ash and slag, which were taken from thermal power plants Nikola Tesla A, Nikola Tesla B, Kostolac A and Kostolac B
All the negative environmental indicators caused by fly ash and slag can be eliminated or reduced if they are used as building material for road construction and other trafficked areas
Summary
Fly ash is the product of burning coal and arises from inorganic substances melting in the thermal power plants. All the negative environmental indicators caused by fly ash and slag can be eliminated or reduced if they are used as building material for road construction and other trafficked areas. Based on the most common characteristics (chemical and mineral composition) of ash and slag from the Ko lubara and Kostolac coal basins, the research objectives presented in this paper are the laboratory testing and research of the physical properties, chemical and mineral compositions of the fly ash from thermal power plants (PP) „Nikola Tesla A” (NT A), „Nikola Tesla B” (NT B), „Kostolac „A” (KO A) and „Kostolac B” (KO B). The aim of this paper is based on establishing a correlation between the physical properties, chemical and mineral composition of the ash and slag. Established correlations are indicators for defining the origin, pro perties, as well as the possibility of fly ash and slag application as a construction substitute preservinglimited reserves of natural building materials
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