Кафедра "Графіка"(з 2021 року ввійшла до складу кафедри "Архітектурне проєктування, землеустрій та будівельні матеріали")

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ENG: Department of the Charts
(since 2021 it has been a part of the department "Architectural design, land management and construction materials")

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Browsing Кафедра "Графіка"(з 2021 року ввійшла до складу кафедри "Архітектурне проєктування, землеустрій та будівельні матеріали") by Author "Rudenko, Dmytro V."

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    Research of Operational Properties of Modified Specialized Concrete for Transport Constructions
    (EDIS, University of Zilina, Slovakia, 2019) Pshinko, Oleksandr M.; Shcherbak, Andriy S.; Rudenko, Dmytro V.
    EN: It was established that the polymeric component of the organomineral modifying complex changes the nature of the super-molecular structures in the activated cement system - at optimal filling, globules decrease in size preventing the phase surface diffusion, which contributes to increase of the waterproofness of modified concrete. When introducing a modified cement system into the concrete mixture, the reduction of the open porosity to 3-5 %, depending on the composition, has been achieved. Conducted tests for water resistance and frost resistance of the repair layer of concrete showed that the modified concrete corresponds to the mark on water resistance W14 and the brand on the frost resistance F300. The developed technology of physico-chemical activation of the cement system allows the use of conventional cement for obtaining durable concrete of special purpose, which allows to reduce the cost of such concrete by 27-34 %.
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    Study of Rheological Properties of Modified Concrete Mixtures at Vibration
    (Trans Tech Publications LTD, Switzerland, 2019) Pshinko, Oleksandr M.; Hromova, Olena V.; Rudenko, Dmytro V.
    EN: Abstract: Study of rheological properties of concrete mixtures based on modified cement systems in order to determine process parameters. Methodology. To study structural-mechanical properties of modified concrete mixtures of different consistency at their horizontal vibrating displacement an oscillatory viscometer was designed. Results. The optimization of the process of vibration displacement of concrete mixtures with the specification of parameters of vibration impacts taking into account structural-mechanical properties of the mixture is performed. It has been established that the viscosity of the modified cement system of the concrete mixture is a variable quantity, which depends on the parameters of the vibration impacts. Scientific novelty. The mechanism of interaction of the modified concrete mixture with the form and the table vibrator during its vibration compaction is determined. On the basis of this, a model of concrete laying process control is proposed, that allows to predict the ability to form a dense concrete structure. Practical significance. Disclosed physical nature of the process of vibrating displacement of modified concrete mixtures using the principles of physical-chemical mechanics of concrete allows reasonably choose the best options for vibration impacts.