Ирина Маева - Academia.edu (original) (raw)
Papers by Ирина Маева
Modern building materials, structures and techniques, Dec 3, 2019
The article focuses on the study of influence of natural and man-made nanoformations (chrysotile ... more The article focuses on the study of influence of natural and man-made nanoformations (chrysotile fibers, carbon black, and graphite) on the formation of the structure of the material based on a hydraulic binder. The data on the positive effect of the optimal amount of modifying dispersions on the physical and technical properties of the samples were obtained. On average, the increase in compressive and bending strength, when using the considered additives, is from 10 to 40%. The results of the study of the microstructure and IR spectra of the check and modified compositions show that adding natural and man-made nanosystems provides optimal conditions for the formation of strong, dense new formations in the cement matrix. In general, the data obtained prove the effectiveness of their use in comparison with synthesized carbon nanosystems.
DOAJ (DOAJ: Directory of Open Access Journals), Feb 1, 2014
DOAJ (DOAJ: Directory of Open Access Journals), Jun 1, 2020
Nanotehnologii v Stroitelʹstve, Oct 31, 2022
MATEC web of conferences, 2018
A facade decorative coating has been developed that is based on sodium silicate and Portland ceme... more A facade decorative coating has been developed that is based on sodium silicate and Portland cement and modified with a complex ultra-and nanodispersed admixture including titanium dioxide, expanded perlite sand, and multi-walled carbon nanotubes dispersion. The advantage of the produced coating is using Portland cement as a silicizer instead of the conventionally used zinc oxide. Adding ultra-and nanodispersed admixtures to the cement-silicate composition leads to the structural modification of the matrix of the binder composition along with the formation of a more durable coating (up to 4-5 times compared with the existing analogues) and the possibility of absorbing man-made electromagnetic radiation up to 38%. Expanded pearlite sand in the silicate coating provides a relief surface when applied on the base. The cement-silicate composition for coating facades is shown to have the following physical and technical characteristics: the viscosity measured with Viscometer-6 is 29 sec; the hydrogen index of the medium pH=12.33; the film resistance to static effect of water is 8 hr; the paint consumption for a two-layer coating is 200-400 g/m 2 ; the adhesion (the cross-cut test) is 1 point; the conventional light-fastness is 4-5 points; the frost-resistance of the silicate coating is 75 cycles. The developed facade cement-silicate coating can be applied on the surface of silicate-containing materials. The cost effectiveness of using the multifunctional protectivedecorative coating has been proved in comparison with similar compositions.
Key Engineering Materials, Jun 1, 2019
At present, efflorescence formation on the surface of brickwork is a problem for many buildings u... more At present, efflorescence formation on the surface of brickwork is a problem for many buildings under construction and those already built. Efflorescence not only spoil the external appearance of the facades, but in rare cases can even lead to peeling of the brick and reducing its durability. The conducted researches show that in most cases efflorescence on the facades of buildings under construction is formed by sodium sulfate and calcium carbonate. Sources of these salts are masonry cement mortars with plasticizing additives containing sodium salts. In this case, the porous structure of bricks contributes to its water saturation and the migration of soluble salts, leading to the formation of efflorescence on the masonry surface. This article suggests the criteria for selecting mortar composition that excludes the appearance of soluble salts, and introduces results of the research on the resistance of ceramic bricks modified with multilayer carbon nanotubes to salt corrosion.
Materials Science Forum, May 26, 2023
Despite the many available studies on the evaluation of the influence of nanomaterials on the pro... more Despite the many available studies on the evaluation of the influence of nanomaterials on the properties of cement-based composites, the effects of some nanoparticles have not yet been fully recognized. Among the unrecognized nanomaterials are magnetite nanoparticles (MN). The literature devoted to this subject is limited. This paper reviews state-of-the-art research carried out on the effect of MN on the properties of cement-based composites. Detailed descriptions of the processing, microstructures (hydration products), properties (hydration, workability, mechanical and functional properties, and durability), and probability applications of MN-engineered cementitious composites are presented. Particular attention has been paid to MN application methods to the cement composite. Finally, the risks, challenges, and future development of MN-modified cement-based composites is discussed.
Строительные материалы, 2022
Строительные материалы, 2022
Строительные материалы, 2022
Stroitel'nye Materialy, 2017
Regionalʹnaâ arhitektura i stroitelʹstvo, 2022
Строительные материалы, 2022
Solid State Phenomena, 2021
The article describes the influence of chrysotile nanofibers dispersion introduction on the prope... more The article describes the influence of chrysotile nanofibers dispersion introduction on the properties of the cement matrix. Comparison of the dispersion level of suspensions obtained using cavitation and ultrasonic processing methods is presented. The positive effect of chrysotile fibers application on the strength characteristics of the material has been confirmed. A 34% increase in the compressive strength of the samples was achieved on the 7th day of hardening, while on the 28th day it increased by 36% and with the steam treatment - by 38% compared to the reference sample. Laser particle size analysis confirmed the predominance of the nanosized component of chrysotile fibers in the suspension, which affected the structuring of the cement matrix. The results of the differential thermography, IR spectrometry, X-ray microanalysis and scanning electron microscopy of the samples are also presented. The analysis methods confirmed that introduction of chrysotile nanofibers suspension i...
Stroitel'nye Materialy, 2019
Advanced Materials Research, 2015
The influence of new complex nanodisperse admixture on structure and strength characteristics of ... more The influence of new complex nanodisperse admixture on structure and strength characteristics of fine grain concrete used in rehabilitation of damaged concrete structures has been studied. Concrete without the admixture is more susceptible to cracking than concrete with the complex admixture, thus increasing the working time of structures. At the age of 28 days the compressive strength of fine grain concrete with the admixture reaches 52,35 MPa, the flexural strength is 5,2 MPa. The strength characteristics of concrete increased by 15%.
Intellekt. Sist. Proizv., 2017
Разработано фасадное декоративное покрытие на основе жидкого натриевого стекла и портландцемента,... more Разработано фасадное декоративное покрытие на основе жидкого натриевого стекла и портландцемента, модифицированное комплексной ультра- и нанодисперсной добавкой, включающей диоксид титана, вспученный перлитовый песок и дисперсию многослойных углеродных нанотрубок. Преимуществом разработанного покрытия является использование в качестве силикатизатора портландцемента вместо традиционно используемого оксида цинка. Разработанное цементно-силикатное покрытие обладает водостойкостью, хорошим сцеплением с основанием, паро- и газопроницаемостью, имеет повышенную долговечность со сроком службы покрытиия, превышающим существующие аналоги в 4-5 раз. Наличие в составе покрытия многослойных углеродных нанотрубок приводит к поглощению техногенного электромагнитного излучения. Вспученный перлитовый песок, входящий в состав силикатного покрытия, позволяет придать ему рельефную поверхность при нанесении на основание. Применение разработанного фасадного цементно-силикатного покрытия возможно по повер...
Construction Materials
Analysis of the use of reinforced concrete structures confirmed the destruction of reinforced pro... more Analysis of the use of reinforced concrete structures confirmed the destruction of reinforced products based on Portland cement due to stray currents, which makes it impossible to achieve the required durability and reliability of structures. The present work shows the results of a study on the diffusion permeability of samples with different degrees of electrical conductivity. The relative value of the electrode potential was measured by the open circuit potential method. The novelty of this work is its analysis of the quantitative and qualitative characteristics of the structure of the mineral matrix with specified electrical properties after long-term exposure to electrochemical corrosion. In this work, an assessment was carried out, for the first time, on the effects of electrochemical corrosion on modified composites with predominantly electrically conductive and electrically insulating properties. An increase in the electrical conductivity of the composite was found to reduce ...
Materials
Destructive processes accompanying sulfate corrosion of concrete significantly affect the durabil... more Destructive processes accompanying sulfate corrosion of concrete significantly affect the durability of products and structures based on Portland cement. In the presented study, the long-term effect of sulfate corrosion on the electrical properties of electrically conductive sand concrete was studied. In the course of the study, the following were tested: an electrically conductive composition and a control composition based on plain Portland cement. The analysis of changes in the mineral composition of the samples over the course of time in an aggressive solution was carried out. The results show that during the exposure period of the samples from 28 to 224 days, the absorption of sulfate ions slows down and averages 26% for the control composition and 29% for the electrically conductive composition, of the total volume of absorbed sulfates. At the same time, the course of sulfate corrosion was accompanied by a 6% increase in the density of samples of both compositions, as well as ...
Modern building materials, structures and techniques, Dec 3, 2019
The article focuses on the study of influence of natural and man-made nanoformations (chrysotile ... more The article focuses on the study of influence of natural and man-made nanoformations (chrysotile fibers, carbon black, and graphite) on the formation of the structure of the material based on a hydraulic binder. The data on the positive effect of the optimal amount of modifying dispersions on the physical and technical properties of the samples were obtained. On average, the increase in compressive and bending strength, when using the considered additives, is from 10 to 40%. The results of the study of the microstructure and IR spectra of the check and modified compositions show that adding natural and man-made nanosystems provides optimal conditions for the formation of strong, dense new formations in the cement matrix. In general, the data obtained prove the effectiveness of their use in comparison with synthesized carbon nanosystems.
DOAJ (DOAJ: Directory of Open Access Journals), Feb 1, 2014
DOAJ (DOAJ: Directory of Open Access Journals), Jun 1, 2020
Nanotehnologii v Stroitelʹstve, Oct 31, 2022
MATEC web of conferences, 2018
A facade decorative coating has been developed that is based on sodium silicate and Portland ceme... more A facade decorative coating has been developed that is based on sodium silicate and Portland cement and modified with a complex ultra-and nanodispersed admixture including titanium dioxide, expanded perlite sand, and multi-walled carbon nanotubes dispersion. The advantage of the produced coating is using Portland cement as a silicizer instead of the conventionally used zinc oxide. Adding ultra-and nanodispersed admixtures to the cement-silicate composition leads to the structural modification of the matrix of the binder composition along with the formation of a more durable coating (up to 4-5 times compared with the existing analogues) and the possibility of absorbing man-made electromagnetic radiation up to 38%. Expanded pearlite sand in the silicate coating provides a relief surface when applied on the base. The cement-silicate composition for coating facades is shown to have the following physical and technical characteristics: the viscosity measured with Viscometer-6 is 29 sec; the hydrogen index of the medium pH=12.33; the film resistance to static effect of water is 8 hr; the paint consumption for a two-layer coating is 200-400 g/m 2 ; the adhesion (the cross-cut test) is 1 point; the conventional light-fastness is 4-5 points; the frost-resistance of the silicate coating is 75 cycles. The developed facade cement-silicate coating can be applied on the surface of silicate-containing materials. The cost effectiveness of using the multifunctional protectivedecorative coating has been proved in comparison with similar compositions.
Key Engineering Materials, Jun 1, 2019
At present, efflorescence formation on the surface of brickwork is a problem for many buildings u... more At present, efflorescence formation on the surface of brickwork is a problem for many buildings under construction and those already built. Efflorescence not only spoil the external appearance of the facades, but in rare cases can even lead to peeling of the brick and reducing its durability. The conducted researches show that in most cases efflorescence on the facades of buildings under construction is formed by sodium sulfate and calcium carbonate. Sources of these salts are masonry cement mortars with plasticizing additives containing sodium salts. In this case, the porous structure of bricks contributes to its water saturation and the migration of soluble salts, leading to the formation of efflorescence on the masonry surface. This article suggests the criteria for selecting mortar composition that excludes the appearance of soluble salts, and introduces results of the research on the resistance of ceramic bricks modified with multilayer carbon nanotubes to salt corrosion.
Materials Science Forum, May 26, 2023
Despite the many available studies on the evaluation of the influence of nanomaterials on the pro... more Despite the many available studies on the evaluation of the influence of nanomaterials on the properties of cement-based composites, the effects of some nanoparticles have not yet been fully recognized. Among the unrecognized nanomaterials are magnetite nanoparticles (MN). The literature devoted to this subject is limited. This paper reviews state-of-the-art research carried out on the effect of MN on the properties of cement-based composites. Detailed descriptions of the processing, microstructures (hydration products), properties (hydration, workability, mechanical and functional properties, and durability), and probability applications of MN-engineered cementitious composites are presented. Particular attention has been paid to MN application methods to the cement composite. Finally, the risks, challenges, and future development of MN-modified cement-based composites is discussed.
Строительные материалы, 2022
Строительные материалы, 2022
Строительные материалы, 2022
Stroitel'nye Materialy, 2017
Regionalʹnaâ arhitektura i stroitelʹstvo, 2022
Строительные материалы, 2022
Solid State Phenomena, 2021
The article describes the influence of chrysotile nanofibers dispersion introduction on the prope... more The article describes the influence of chrysotile nanofibers dispersion introduction on the properties of the cement matrix. Comparison of the dispersion level of suspensions obtained using cavitation and ultrasonic processing methods is presented. The positive effect of chrysotile fibers application on the strength characteristics of the material has been confirmed. A 34% increase in the compressive strength of the samples was achieved on the 7th day of hardening, while on the 28th day it increased by 36% and with the steam treatment - by 38% compared to the reference sample. Laser particle size analysis confirmed the predominance of the nanosized component of chrysotile fibers in the suspension, which affected the structuring of the cement matrix. The results of the differential thermography, IR spectrometry, X-ray microanalysis and scanning electron microscopy of the samples are also presented. The analysis methods confirmed that introduction of chrysotile nanofibers suspension i...
Stroitel'nye Materialy, 2019
Advanced Materials Research, 2015
The influence of new complex nanodisperse admixture on structure and strength characteristics of ... more The influence of new complex nanodisperse admixture on structure and strength characteristics of fine grain concrete used in rehabilitation of damaged concrete structures has been studied. Concrete without the admixture is more susceptible to cracking than concrete with the complex admixture, thus increasing the working time of structures. At the age of 28 days the compressive strength of fine grain concrete with the admixture reaches 52,35 MPa, the flexural strength is 5,2 MPa. The strength characteristics of concrete increased by 15%.
Intellekt. Sist. Proizv., 2017
Разработано фасадное декоративное покрытие на основе жидкого натриевого стекла и портландцемента,... more Разработано фасадное декоративное покрытие на основе жидкого натриевого стекла и портландцемента, модифицированное комплексной ультра- и нанодисперсной добавкой, включающей диоксид титана, вспученный перлитовый песок и дисперсию многослойных углеродных нанотрубок. Преимуществом разработанного покрытия является использование в качестве силикатизатора портландцемента вместо традиционно используемого оксида цинка. Разработанное цементно-силикатное покрытие обладает водостойкостью, хорошим сцеплением с основанием, паро- и газопроницаемостью, имеет повышенную долговечность со сроком службы покрытиия, превышающим существующие аналоги в 4-5 раз. Наличие в составе покрытия многослойных углеродных нанотрубок приводит к поглощению техногенного электромагнитного излучения. Вспученный перлитовый песок, входящий в состав силикатного покрытия, позволяет придать ему рельефную поверхность при нанесении на основание. Применение разработанного фасадного цементно-силикатного покрытия возможно по повер...
Construction Materials
Analysis of the use of reinforced concrete structures confirmed the destruction of reinforced pro... more Analysis of the use of reinforced concrete structures confirmed the destruction of reinforced products based on Portland cement due to stray currents, which makes it impossible to achieve the required durability and reliability of structures. The present work shows the results of a study on the diffusion permeability of samples with different degrees of electrical conductivity. The relative value of the electrode potential was measured by the open circuit potential method. The novelty of this work is its analysis of the quantitative and qualitative characteristics of the structure of the mineral matrix with specified electrical properties after long-term exposure to electrochemical corrosion. In this work, an assessment was carried out, for the first time, on the effects of electrochemical corrosion on modified composites with predominantly electrically conductive and electrically insulating properties. An increase in the electrical conductivity of the composite was found to reduce ...
Materials
Destructive processes accompanying sulfate corrosion of concrete significantly affect the durabil... more Destructive processes accompanying sulfate corrosion of concrete significantly affect the durability of products and structures based on Portland cement. In the presented study, the long-term effect of sulfate corrosion on the electrical properties of electrically conductive sand concrete was studied. In the course of the study, the following were tested: an electrically conductive composition and a control composition based on plain Portland cement. The analysis of changes in the mineral composition of the samples over the course of time in an aggressive solution was carried out. The results show that during the exposure period of the samples from 28 to 224 days, the absorption of sulfate ions slows down and averages 26% for the control composition and 29% for the electrically conductive composition, of the total volume of absorbed sulfates. At the same time, the course of sulfate corrosion was accompanied by a 6% increase in the density of samples of both compositions, as well as ...