Ресурсозбереження та енергоефективність
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Документ Оптимізація технології бетелів(Управління розвитком складних систем. – 2019. №39., 2019) Г. Ю. Краснянський, В. І. Клапченко, І. О. Азнаурян, І. О. КузнецоваДокумент Застосування золи теплоелектростанцій в технології бетону(Інтегровані енергоефективні технології в архітектурі та будівництві: «Енергоінтеграція-2018»: Восьма міжн. наук.-практ. конф. (25-27 квітня 2018 р., м. Київ). Робоча програма та тези доповідей. – Київ, 2018. – С. 36-37., 2018) Клапченко В.І., Г.Ю. Краснянський, І.О. Азнаурян, І.О.КузнецоваДокумент Використання золи теплоелектростанцій у виробництві бетону(Енергоефективність в будівництві та архітектурі. – 2018. – №10. – С. 47-53., 2018) Клапченко В. І., Краснянський Г. Ю., Азнаурян І. О., Кузнецова І. О.In order to reduce the cost and energy intensity of concrete, reducing the negative impact on the environment during its production, industrial waste is widely used, in particular, the ash of removal of heat and power plants. The results of studies of equilibrium water-holding and mass-transfer properties of a soluble part of concrete with additives of ashes of thermal power stations are presented in order to obtain additional information on the mechanism of interaction between particles of ash and cement and its relationship with the strength indicators of the cement-ash materials. The methods of isotherms of desorption and capillary impregnation are measured equilibrium moisture content at different humidity of air, differential gradient distribution curves according to radii, maximum moisture content, capillary-toporosity and coefficient of mass transfer of the rising part of concrete with additives of ashes of Krivorizhsky and Ladyzhinskaya TPPs. The results were obtained for specimens that were subjected to thermovalysis and for specimens after 28 days of prime hardening. In the approximation of the monodisperic globular structure of the investigated materials, the effective radius of pores involved in the mass transfer and the coefficient of filtration are calculated. The compressive strength of these materials is also measured. On the basis of the conducted researches, the nature of the influence on the change in the strength parameters of these materials of such factors as granulometric, chemical, phase composition of ash, water-cement ratio, and curing mode is established. It is shown that in order to adequately integrate the obtained results it is necessary to simultaneously take into account such factors as the content of ash in the mixture, the water-cement ratio, porosity, effective pore radius, pore size distribution. It is shown that there is a gap-free correlation between the strength of materials compression and the coefficient of filtration. There were proposed optimal concrete compositions with ashes additions.Документ Управління структурою цементного каменя з тонкомеленими мінеральними добавками(Управління розвитком складних систем. – 2019. №38. – С. 200-204., 2019) В. І. Клапченко, Ирина Г. Ю. Краснянський, І. О. Азнаурян, І.О. КузнецоваAbstract.To select the volumes of additives-fillers introduced into cement that are optimal in terms of the quality and cost of the material obtained, it is necessary to know the mechanisms of their influence on the construction and technical properties of the material. The objects of the study were cement stones based on Portland cement clinker with a filler – fine ground quartz sand. Samples were tested for strength and investigated by drying thermograms to determine the specific surface of the solid phase. Based on the analysis of the results obtained, a mechanism is proposed for the influence of the filler on the properties of the cement stone, which consists in the formation, at a certain concentration of an additive of locally cluster structures in hardening cement paste. This leads to the emergence of special conditions in the microvolumes of hardening cement paste due to the interconnection of the filler grains with the coagulation-crystallization structure of cement hydration products growing on the active surface of the grains. As a result, significant changes in the structure of the formed cement stone with a higher specific surface should occur. In the framework of the proposed model, expressions are obtained for calculating the filler concentrations leading to the maximum strength properties of the material. These results allow to assign concentrations of fine ground filler, providing optimum physical and technical characteristics of concrete.