High-performance concrete for industrial construction and mechanical engineering

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Abstract

The multicomponent composition of the raw material mixture and the heterogeneity of the structure of highly functional concretes at various scale levels make it possible to effectively control the formation of indicators of its damping properties due to prescription and technological factors. Experimental compositions included Portland cement, quartz sand, granite screening, silica, metacaolin, quartz flour, microcalcite, shrinkage compensators, hyperplasticizer and reinforcing microfiber. The hydrodynamic properties were investigated by methods of free and forced oscillations.Experimental compositions included Portland cement, quartz sand, granite screening, silica, metacaolin, quartz flour, microcalcite, shrinkage compensators, hyperplasticizer and reinforcing microfiber. The hydrodynamic properties were investigated by methods of free and forced oscillations.Experimental compositions included Portland cement, quartz sand, granite screening, silica, metacaolin, quartz flour, microcalcite, shrinkage compensators, hyperplasticizer and reinforcing microfiber. The hydrodynamic properties were investigated by methods of free and forced oscillations.A laboratory complex of vibrodynamic tests has been developed that provides automated processing of the amplitudes of bending damping vibrations of the first mode of concrete samples to calculate the dynamic modulus of elasticity and the logarithmic decrement of attenuation. The high accuracy of the results obtained made it possible to identify the nature of the influence of various prescription factors (consumption of cement, pozzolan additives, microfiber, shrinkage compensators) on the dynamic modulus of elasticity and damping of concrete. An increase in the value of concrete damping (by 1.22 times) was established with an increase in cement consumption from 300 to 734 kg/m3. The introduction of shrinkage compensators, differing in the mechanism of action, made it possible to obtain non-shrinkable injection molding compositions and favorably affects the vibrodynamic parameters correlating with the magnitude of the overall heterogeneity of the microstructure of concrete.The results of the research have been tested in the manufacture of prototypes of concrete and reinforced concrete cutting machines (small-sized milling machine), as well as laboratory testing equipment.

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About the authors

I. Yu. Lavrov

Penza State University of Architecture and Construction

Author for correspondence.
Email: lavrov0909@gmail.com

Postgraduate Student 

Russian Federation, 28, Titova Street, Penza, 440028

V. A. Beregovoy

Penza State University of Architecture and Construction

Email: techbeton@pguas.ru

Doctor of Sciences (Engineering), Professor 

Russian Federation, 28, Titova Street, Penza, 440028

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Supplementary files

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2. Fig. 1. Laboratory complex for vibrodynamic testing of concrete by the method of free (a, c) and forced (b, d, e) vibrations

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3. Fig. 2. Algorithm of vibrodynamic tests using the free vibration method

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4. Fig. 3. Effect of cement content on the deformability of concrete: a – kinetics of changes in the static modulus of elasticity of concrete during hardening under normal conditions; b – comparison of the static and dynamic modulus of elasticity after 28 days of normal hardening

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5. Fig. 4. Logarithmic decrement of attenuation of concrete samples with different cement content after 180 days of normal hardening

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6. Fig. 5. Changes in the dynamic characteristics of concrete during the hardening process: a – damping; b – dynamic modulus of elasticity (composition numbers according to Table)

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7. Fig. 6. The fiber used: a, b – steel (general view and microphotograph); c – polypropylene (general view)

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8. Fig. 7. Diagram of the dependence of the damping value on the dynamic modulus of elasticity of fiber-reinforced concrete at different ages

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9. Fig. 8. Characteristics of concrete and concrete mix modified with anti-shrinkage additives

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10. Fig. 9. Shrinkage of concrete with anti-shrinkage additives (after the value reaches a plateau under the specified temperature and humidity conditions)

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11. Fig. 10. Dynamic characteristics of concrete: a – dynamic elastic module; b – logarithmic decrement of attenuation

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12. Fig. 11. Developed processing and testing equipment with concrete base parts: a, b – small-sized CNC milling machine; c – frame of multifunctional viscometer; d, e – tensile testing machine; f – frames of mechanical testing stand

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Note

Статья подготовлена на основе доклада – победителя (1 место) конкурса молодых ученых, состоявшегося в рамках I Международной конференции молодых ученых «Решения современных проблем материаловедения и технологии в строительстве. ВладСтройТех-2024».


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