Search citation statements
Paper Sections
Citation Types
Year Published
Publication Types
Relationship
Authors
Journals
In Ukraine, about 30% of all electricity is generated from the combustion of solid fuels such as coal, oil shale, and 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. Thus, the fuel and energy sector 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 treatment (1200 °C - 1700 °C) 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 waste, we should predict an increase in the rate of their processing in Ukraine.In Ukrainian practice, asphalt concrete is mainly used as a mineral powder obtained by grinding carbonate rocks in accordance with DSTU B V.2.7-119 and DSTU B V.2.7-121. At the same time, millions of tons of dusty waste - fly ash - are generated at Ukrainian power generating enterprises as a result of coal combustion. This material meets the requirements of DSTU B V.2.7-121 and can be used for the production of asphalt mixtures. However, it has not been sufficiently studied how fly ash affects the technological aging of bitumen.The aim of this study is to evaluate the effect of fly ash aggregates on the technological aging of bitumen in the asphalt binder system in comparison with traditional mineral powders of various origins. It was found that fly ash is close to the performance of limestone aggregate and can be used as an asphalt filler in asphalt concrete.As a result of the laboratory studies and analysis of the results of the impact of technological aging on the asphalt binder, we can state that the aging index of asphalt binder with fly ash is intermediate between limestone mineral powder and granite dust and is close to that of asphalt binder with limestone mineral powder. This may indicate that the use of fly ash as a mineral powder in asphalt mixtures will not negatively affect their technological aging. Other studies of the physical and mechanical properties of asphalt concrete with fly ash performed by the authors allow us to conclude that fly ash, as a material, is suitable for use as an aggregate for asphalt concrete mixtures.
In Ukraine, about 30% of all electricity is generated from the combustion of solid fuels such as coal, oil shale, and 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. Thus, the fuel and energy sector 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 treatment (1200 °C - 1700 °C) 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 waste, we should predict an increase in the rate of their processing in Ukraine.In Ukrainian practice, asphalt concrete is mainly used as a mineral powder obtained by grinding carbonate rocks in accordance with DSTU B V.2.7-119 and DSTU B V.2.7-121. At the same time, millions of tons of dusty waste - fly ash - are generated at Ukrainian power generating enterprises as a result of coal combustion. This material meets the requirements of DSTU B V.2.7-121 and can be used for the production of asphalt mixtures. However, it has not been sufficiently studied how fly ash affects the technological aging of bitumen.The aim of this study is to evaluate the effect of fly ash aggregates on the technological aging of bitumen in the asphalt binder system in comparison with traditional mineral powders of various origins. It was found that fly ash is close to the performance of limestone aggregate and can be used as an asphalt filler in asphalt concrete.As a result of the laboratory studies and analysis of the results of the impact of technological aging on the asphalt binder, we can state that the aging index of asphalt binder with fly ash is intermediate between limestone mineral powder and granite dust and is close to that of asphalt binder with limestone mineral powder. This may indicate that the use of fly ash as a mineral powder in asphalt mixtures will not negatively affect their technological aging. Other studies of the physical and mechanical properties of asphalt concrete with fly ash performed by the authors allow us to conclude that fly ash, as a material, is suitable for use as an aggregate for asphalt concrete mixtures.
Summary. 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. In terms of indicators, this material approaches the requirements for filler according to DSTU B V.2.7-121 and can be used for the production of asphalt concrete mixtures.
Introduction. Mineral filler is an important component of asphalt mixture which plays an important role in ensuring the quality of asphalt mixtures. The specific surface of mineral filler is about 90 % of the specific surface of aggregates in asphalt mixture. Being a part of asphalt mixture, mineral filler performs two roles: it fills the pores between fine grained and coarse-grained aggregate and structurizes bitumen. Recently, a significant amount of works has been devoted to the study of industrial waste as a raw material for the production of mineral filler. First of all, these studies are related to the evaluation of the direct effect of mineral filler mainly on the volumetric properties of asphalt concrete or on its strength properties. Since one of the purposes of mineral filler is structurizing of bitumen, it is reasonable to pay considerable attention when studying the alternative raw materials, to the structurizing ability of the obtained mineral filler, as insufficient structurizing ability of mineral filler can cause plastic deformations, and too high structurizing ability causes the decreasing of its low-temperature crack resistance. Problem statement. In order to evaluate the structurizing ability of the mineral filler, the «ring and ball method» is preferably used, in which the structurizing ability is evaluated by ane increase in the softening point of bitumen after mixing with the mineral filler. However, this method characterizes only the effect of mineral filler on the properties of bitumen at high operating temperatures, but it does not consider the possible change in the properties of bitumen at low operating temperatures and at process temperatures. Objective. This study explores the evaluation of the effect of mineral filler of different origin on the structuring of bitumen at low and high operating temperatures, as well as at process temperatures for the production of asphalt mixtures. Materials and methods. Mineral filler of limestone, granite, quartzite, fly ash, mechanically activated fly ash, the ash from hydraulic waste disposal, blast furnace slag and cement had been used for research. Results. The results of researches showed a significant effect of the mineral filler origin on its structurizing capacity. The structurizing capacity of mineral filler increases with growing temperature; so at low operating temperature mineral filler has almost no effect on the properties of bitumen, and with the increase of temperature to the values of high operating temperature and process temperatures of asphalt mixtures production, the effect of mineral filler on bitumen properties becomes much more significant. Conclusions. Studies of the structurizing capacity of mineral filler of different origins by changing the softening point had shown the possibility of using the raw materials of different origins for the production of mineral filler namely: raw materials from rock (sedimentary, erupted and metamorphic), raw materials from industrial by-products (fly ash, ash from hydraulic waste disposal, blast furnace slag), and also practically finished construction product (cement). For evaluation of the effectiveness of mineral filler, it is possible to study its structurizing capacity by changing the brittleness temperature, as during determination of this indicator, it is possible to evaluate the effect of structuring, which consists in maintaining the homogeneity of asphalt binder during the preparation of plates.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.