The work is devoted to the urgent issues of processing of sulfur-containing and ash-and-slag waste of industrial enterprises. The process flow scheme for obtaining of protective coatings on cement concrete, by impregnation in sulfur melt with high strength, performance properties, and resistance to aggressive environments, was developed. The technological parameters of the process were determined. The addition of ash and slag to the cement concrete allows not only to utilize the waste of heat power industry, but also to increase the strength of the material. Moreover, the applied technology of impregnation provides low thermal conductivity of concrete, and good thermalinsulation characteristics of the material. The increase in strength of samples, containing ash and slag waste, is due to the high dispersion and active surface of ash and slag. The influence of aluminum chloride, an electrophilic agent, on the properties of sulfur binder, was considered. It was shown, that the introduction of aluminum chloride contributed to a more effective protective coating, which provided the samples of cement concrete with high strength, density, and water resistance. The use of an electrophilic agent made it possible to intensify the process of obtaining of inorganic sulfides and composite materials, based on them. It was found, that the application of an electrophilic additive -aluminum chloride -significantly reduced the viscosity of sulfur melt, that was due to the formation of short-chain sulfur radicals. Such a sulfur melt has a fairly high penetrating ability, that provides the formation of a high-quality protective coating.
The most important area of resource conservation is the extensive use of secondary products of the industry as feedstock to produce building materials. Benefits of secondary products usage are to enhance the physical and mechanical characteristics and strength characteristics of the resulting building materials. By-products of different sectors of industry, such as ash and slag waste from combined heat and power systems and glass industry cullet, which provide the industry with huge sources of cheap and prepared raw materials, are used as accessory materials. They reduce the cost of producing certain materials. Three main mixtures are addressed in the article: (1) a mixture of cement, ash and slag waste and glass cullet, (2) a mixture of clay and ash and slag waste, and (3) a mixture of clay, ash and slag waste and glass cullet. The production processes of the tested materials are described: preparation and thermal treatment of raw materials. Material properties obtained after the roasting were determined: compression capacity, absorption of water and level of firing shrinkage. Not all materials are amenable to characterization techniques used in standardized ways of testing.
The paper discusses the important issues concerning recycling of industrial sulfur waste and bottom ash. The process flow diagram was designed to form protective coatings on cement concrete by impregnation with molten sulfur, which featured high strength, performance properties and corrosion resistance. The process parameters were specified. The addition of bottom ash slag to cement concrete not only offers a means for recovering waste from thermal power stations, but also increases the material strength. Besides, the impregnation process provides low thermal conductivity for concrete while giving the material high heat insulation. A higher strength of the samples containing bottom ash slag results from a high dispersity and reactive surface of bottom ash slag. The paper investigates the influence of the electrophilic agent (aluminum chloride) on the properties of sulfur binder. It was shown that addition of aluminum chloride encouraged the formation of a more effective protective coating that gave the samples of cement concrete higher strength, density, water resistance. The electrophilic agent stimulated the synthesis process for inorganic sulfides and composite materials based on them. It was found that addition of the electrophilic agent (aluminum chloride) reduced the viscosity of molten sulfur significantly, which was attributed to the formed short-chain sulfur radicals. Such a melt has a relatively high penetration capability to ensure the formation of a high-quality protective coating.
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