New methods for manufacturing composite materials

Zagorodnuk, L. Kh.; Lesovik, Valery; Elistratkin, M.Yu.; Sumskoy, D.; Махортов, Д.С.; Zolotykh, S.

doi:10.1088/1742-6596/1353/1/012060

Cited by 3 publications

(2 citation statements)

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“…As practice shows, under modern conditions at concrete mixing plants, the production of concrete with rationally selected small and coarse aggregates-the use of which increases the density of mixes, reduces the consumption of binders and reduces the cost of production-is a growing priority. The lack of coarse natural aggregates in different parts of the world is a problem [17,18]. The search for new coarse aggregates requires the extraction of additional natural resources, the use of which leads to a violation of the natural ecological balance [19,20].…”

Section: Of 12mentioning

confidence: 99%

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

et al. 2021

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It is necessary to solve the ecological problems of regions where there is large-tonnage storage of various finely dispersed materials, including technogenic ones. This article presents the results of an investigation into the possible use of substandard dispersed quartz sands to obtain effective granular aggregates, with the purpose of putting them to use in mortars and concrete. The study used standard and original experimental research methods related to the analysis and preparation of raw materials, technological tests, and the study of the properties of finished composites. Investigations were carried out to obtain composite binders in the component composition of which the use of different ratios of Portland cement and substandard quartz sands prepared in a vortex jet mill was envisaged. It was found that the obtained composite binders had high physical and mechanical characteristics, which was due to the high specific surface area and hydration activity. On the basis of composite binders and finely dispersed quartz sands (fineness from ≤0.16 mm to 1 mm), the granulation of mixtures of 36 types of component compositions was performed. The developed compositions of granular aggregates (GAs) showed the possibility of obtaining them with sufficiently high strength values in cement stone. The studies carried out make it possible to recommend finely dispersed substandard and technogenic materials for the production of GAs, which would ensure the economy of binding materials as well as contribute to the reuse of large-tonnage waste of ferrous and nonferrous metallurgy and the chemical and mining industries.

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Section: Of 12mentioning

confidence: 99%

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

et al. 2021

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“…При создании эффективного теплоизоляционного раствора нами проведена многократная оптимизация на всех стадиях его создания, а именно, на стадии получения композиционных вяжущих, приготовленных на основе портландцемента и минерального наполнителя, на стадии введения функциональных добавок, заполнителявспученного перлитового песка и на стадии введения пенополистирольных микросфер. Для снижения плотности теплоизоляционных растворов необходимо создать эффективное композиционное вяжущее [1][2][3][4][5]. Для выбора оптимального состава, вяжущего на начальном этапе исследований были исследованы составы вяжущих композиций с различным процентным соотношением, с различными проходами (один, два и три раза) через вихревую струйную мельницу.…”

Section: Introductionunclassified

Heat-insulating mortar based on composite binder

Сумской

2018

Vestn. Voronež. gos. univ. inž. tehnol.

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The article presents the results of studies on obtaining a heat-insulating solution obtained by grinding. The binding compositions were synthesized at various ratios of cement and waste products of perlite sand in ajet mill under different grinding regimes. The features of grinding processes have been studied and technological and physicomechanical properties of the resulting binding compositions have been determined. The microstructure of cement stones obtained from activated Portland cement and binding compositions in ajet mill was studied by electron microscopy. It is established that open pores of cement-binding compositions prepared using perlitic fillers are filled with neoplasms and perlite grains have a plate-prismatic shape, which is clearly seen in micrographs. The microstructure of binding compositions has a dense structure due to a rationally selected composition, the use of an effective mineral filler, which creates additional substrates to form the internal microstructure of the composite. A comparative X-ray diffraction analysis of hydrated plain cement and binding composition was carried out and it was established that hydrated cement and binding composition are identical in mineral composition, having Ca hydroalumates, Ca (OH)2, CSH, and low amounts of ettringite. A distinctive feature of the diffractograms is the significant amorphization of the binding composition. The range of the optimal ratio of cement to perlite was found to be 1:9; 1:11; 1:13. A heat-insulating solution based on composite binder and expanded perlite aggregate (1:11) with a density of 1200 kg / m3 and a strength of 2.5 MPa was obtained. Modification of the solution by additives of superplasticizer; blowing agent; redispersible dispersion powder, it was possible to obtain a heat-insulating solution with a density of 973.11 kg/m3. Optimization of this solution with expanded polystyrene microspheres made it possible to obtain a density of the composite of 240-260 kg/m3 at a compressive strength of 1.05-1.15 MPa. The developed heat-insulating compounds have a reduced density and sufficient strength, which is the reason to recommend them for use in the manufacture of construction works.

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Composition and Properties of TiO<sub>2</sub> Sol to Produce a Photocatalytic Composite Material

Gubareva

Строкова

Ogurtsova

et al. 2020

KEM

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The paper presents the process of sol-gel synthesis of titanium dioxide nanoparticles, the peculiarities of the influence of component composition (titanium precursor content, solvent and stabilizer − surfactant) on the properties of sol and powder obtained on its basis. As a result of the study, the nature of the influence of the type and content of the surfactant in the solution of tetrabutoxytitanium in ethanol on the size of the synthesized particles of titanium dioxide was revealed. The optimal composition of the reaction mixture of TiO–R sol was obtained and the optimal ratio of tetrabutoxytitanium and ethyl alcohol was revealed using which a material with a high content of nanosized titanium dioxide was obtained.

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New methods for manufacturing composite materials

Cited by 3 publications

References 1 publication

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

Heat-insulating mortar based on composite binder

Composition and Properties of TiO<sub>2</sub> Sol to Produce a Photocatalytic Composite Material

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