Experimental studies of the processes of structure formation ofcomposite mixtures with technogenic mechanoactivated silica component

Klyuev, A.V.; Кашапов, Н. Ф.; Klyuev, Sergey; Золотарева, С. В.; Shchekina, Natalia; Шорстова, Елена; Lesovik, R. V.

doi:10.58224/2618-7183-2023-6-2-5-18

Cited by 7 publications

(3 citation statements)

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“…The improvement in physical and mechanical properties of MS-modified VCC is attributed to the interaction mechanism of MS with PC and its distribution in the concrete composite. At an optimal MS content of 2% to 8%, microsilica particles having pozzolanic activity enter into a hydration reaction and contribute to the formation of additional calcium hydrosilicates, which strengthen the future structure of the composite [ 25 , 83 ]. MS particles also function as a mineral filler.…”

Section: Resultsmentioning

confidence: 99%

Influence of Polymer Fibers on the Structure and Properties of Modified Variatropic Vibrocentrifuged Concrete

Shcherban’,

Stel’makh,

Mailyan

et al. 2024

Polymers

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The application of polymer materials in concrete structures is widespread and effectively used. However, there is a lack of a systematic knowledge base about the structure formation and properties of variatropic vibrocentrifuged modified fiber-reinforced concrete. The purpose of this work is the investigation of the influence of polypropylene (PF) and basalt fiber (BF) and modification with microsilica (MS) on the properties of variatropic concretes obtained using the synthesized vibration centrifugation technology. Test samples were made using vibration centrifugation technology, followed by sawing. Various types of fiber reinforcement were studied, both individually and in combination. To determine the degree of effectiveness of each recipe solution, the following main characteristics were monitored: the density and workability of concrete mixtures; the density of hardened composites; compressive strength (CS); bending strength (BS); water absorption (WA). In variatropic vibrocentrifuged concrete, the greatest efficiency is achieved with dispersed BF reinforcement in an amount of 1.5%. Compared to the control composition, the increase in CS was 8.50%, the increase in BS was 79.17%, and WA decreased by 27.54%. With PF reinforcement, the greatest effect was recorded at a dosage of 1.0%. The increase in CS was 3.16%, the increase in BS was 10.42%, and WA decreased by 17.39%. The MS modification showed the best effect with 8% replacement of part of the Portland cement. The increase in CS was 17.43%, the increase in BS was 14.58%, and WA decreased by 33.30%. The most effective and economically rational formulation solution for vibrocentrifuged concrete is combined fiber reinforcement in combination with the MS modification in the following quantities: BF—1.0%; PF—0.5%; MS—8%. The increase in CS was 22.82%, the increase in BS was 85.42%, and WA decreased by 37.68%.

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Section: Resultsmentioning

confidence: 99%

Influence of Polymer Fibers on the Structure and Properties of Modified Variatropic Vibrocentrifuged Concrete

Shcherban’,

Stel’makh,

Mailyan

et al. 2024

Polymers

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“…However, on the other hand, an approach related to the search for hidden reserves and unexplored areas in already known types of building structures, which, for certain reasons, were not taken into account in calculations and design, may also be of interest. Essentially, this way of solving the problem concerns either a new approach to already known building structures, proven over decades of practical application and discussed in detail in regulatory documents, which implies the use of new materials, or a certain improvement in the technology for implementing design solutions, considering modern development prospects in the field of construction technologies, structures, calculations, and design [7][8][9][10].…”

Section: Introduction-general Picture Of the Current State Of Variatr...mentioning

confidence: 99%

Analytical Review of the Current State of Technology, Structure Formation, and Properties of Variatropic Centrifugally Compacted Concrete

Shcherban’,

Stel’makh,

Mailyan

et al. 2024

Materials

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Current regulatory documents and the scientific literature lack a theoretical framework and practical guidance for calculating centrifugally compacted reinforced concrete structures, taking into account the variatropy of their structure and the material’s characteristics across the section. A problem related to this research lies in the need to form a systematized, theoretical, and practical knowledge base about variatropic concretes, the importance of which has been proven by various scientists without, to date, the creation of a unified scientific methodological base. The importance of this study is linked to the need for the world’s construction projects and processes to transition to the most economically, materially, and resource-efficient types of building structures, which, of course, include structures made of variable-type concrete. This study’s objective is to fill these scientific and engineering gaps. The purpose of this study was to systematize the existing knowledge base about the technology, structure formation, and properties of variatropic concrete, using an analytical review of previously conducted studies by ourselves and others, both in Russia and abroad. A theoretical justification for the formation of the structure of variatropic materials is presented. An analysis of the basic physical and mechanical properties of variatropic concretes is carried out and the features of their microstructures are considered. The main structures created using centrifugation technology are considered. Variatropic concrete has an increased amount of mechanical characteristics compared to traditional concrete, on average by up to 45%. The durability of variatropic concrete is improved, on average, by up to 30% compared to conventional concrete.

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“…One example of such building materials that are most efficient in terms of energy saving is cellular concrete [11][12][13][14]. A number of works are known in the study of industrial, fuel, and energy waste as components in the composition of cellular concrete [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

Stel’makh,

Shcherban’,

Beskopylny

et al. 2023

J. Compos. Sci.

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Foam concrete is a popular energy-efficient construction material with a fairly wide range of usage in buildings and structures. Increasing ecological efficiency and reducing construction costs by the application of different types of industrial waste in the manufacturing technology of this composite is a promising direction. The main goal of this study is to investigate the possibility of coal dust (CD) waste inclusion in the technology of energy-efficient cellular concrete produced by foam concrete technology. Test samples of foam concrete were made using coal dust by partially replacing cement in the range of 0–10% in increments of 2%. The following primary characteristics of foam concrete were studied: fluidity of mixtures; compressive strength; density; thermal conductivity of foam concrete. An X-ray diffraction analysis of foam concrete composites was performed, which showed changes in their phase composition when using coal dust as a modifier. Coal dust in rational quantities from 2% to 6% improves the physical and mechanical characteristics of foam concrete and increases the structure uniformity. The optimal values of the foam concrete characteristics were recorded at a dosage of coal dust of 6%. At the same time, the density decreased by 2.3%, the compressive strength increased by 15.6%, and the thermal conductivity coefficient decreased by 8.9% compared to the ordinary composition. The use of the resulting foam concrete is advisable in enclosing structures to create high energy efficiency of buildings and structures due to the improved structure and properties.

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Experimental studies of the processes of structure formation ofcomposite mixtures with technogenic mechanoactivated silica component

Cited by 7 publications

References 0 publications

Influence of Polymer Fibers on the Structure and Properties of Modified Variatropic Vibrocentrifuged Concrete

Influence of Polymer Fibers on the Structure and Properties of Modified Variatropic Vibrocentrifuged Concrete

Analytical Review of the Current State of Technology, Structure Formation, and Properties of Variatropic Centrifugally Compacted Concrete

Structural Formation and Properties of Eco-Friendly Foam Concrete Modified with Coal Dust

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