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Maria Karelina
Moscow Automobile and Road Construction University, 125319 Moscow, Russia

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Journal article
Published: 26 August 2021 in Sustainability
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A cement paste or mortar is composed of a mineral skeleton with micron to millimeter-sized grains, surrounded by water filaments. The cohesion or shear resistance in the cement paste and mortar is caused by capillary forces of action. In the case of mortar mixes, there is friction between the particles. Therefore, the mortar mixture shows both friction between particles and cohesion, while the paste shows only cohesion, and the friction between particles is negligible. The property of the cement paste is greatly influenced by the rheological characteristics like cohesion and internal angle friction. It is also interesting that when studying the rheology of fresh concrete, the rheological behavior of cement paste and mortar has direct applicability. In this paper, the rheological characteristics of cement paste and mortar with and without mineral admixtures, that is, fly ash and ground granulated blast-furnace slag (GGBS), were studied. A cement mortar mix with a cement-to-sand ratio of 1:3 was investigated, including fly ash replacement from 10% to 40%, and GGBS from 10% to 70% of the weight of the cement. A suitable blend of fly ash, GGBS, and ordinary Portland cement (OPC) was also selected to determine rheological parameters. For mortar mixtures, the flow table was conducted for workability studies. The flexural and split tensile strength tests were conducted on various mortar mixtures for different curing times. The results indicate that in the presence of a mineral mixture of fly ash and GGBS, the rheological behavior of paste and mortar is similar. Compared with OPC-GGBS-based mixtures, both cement with fly ash and ternary mixtures show less shear resistance or impact resistance. The rheological behavior of the mortar also matches the rheological behavior in the flow table test. Therefore, it is easy to use the vane shear test equipment to conduct cohesion studies to understand the properties of cement paste and mortar using mineral admixtures. The strength results show that the long-term strength of GGBS-based mixtures and ternary mixed mixtures is better than that of fly-ash-based mixtures. For all mixtures, the strength characteristics are greatest at a w/b ratio of 0.6.

ACS Style

V. Arularasi; P. Thamilselvi; Siva Avudaiappan; Erick I. Saavedra Flores; Mugahed Amran; Roman Fediuk; Nikolai Vatin; Maria Karelina. Rheological Behavior and Strength Characteristics of Cement Paste and Mortar with Fly Ash and GGBS Admixtures. Sustainability 2021, 13, 9600 .

AMA Style

V. Arularasi, P. Thamilselvi, Siva Avudaiappan, Erick I. Saavedra Flores, Mugahed Amran, Roman Fediuk, Nikolai Vatin, Maria Karelina. Rheological Behavior and Strength Characteristics of Cement Paste and Mortar with Fly Ash and GGBS Admixtures. Sustainability. 2021; 13 (17):9600.

Chicago/Turabian Style

V. Arularasi; P. Thamilselvi; Siva Avudaiappan; Erick I. Saavedra Flores; Mugahed Amran; Roman Fediuk; Nikolai Vatin; Maria Karelina. 2021. "Rheological Behavior and Strength Characteristics of Cement Paste and Mortar with Fly Ash and GGBS Admixtures." Sustainability 13, no. 17: 9600.

Review
Published: 30 July 2021 in Materials
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Development of sustainable concrete as an alternative to conventional concrete helps in reducing carbon dioxide footprint associated with the use of cement and disposal of waste materials in landfill. One way to achieve that is the use of fly ash (FA) as an alternative to ordinary Portland cement (OPC) because FA is a pozzolanic material and has a high amount of alumina and silica content. Because of its excellent mechanical properties, several studies have been conducted to investigate the use of alkali-activated FA-based concrete as an alternative to conventional concrete. FA, as an industrial by-product, occupies land, thereby causing environmental pollution and health problems. FA-based concrete has numerous advantages, such as it has early strength gaining, it uses low natural resources, and it can be configurated into different structural elements. This study initially presents a review of the classifications, sources, chemical composition, curing regimes and clean production of FA. Then, physical, fresh, and mechanical properties of FA-based concretes are studied. This review helps in better understanding of the behavior of FA-based concrete as a sustainable and eco-friendly material used in construction and building industries.

ACS Style

Mugahed Amran; Roman Fediuk; Gunasekaran Murali; Siva Avudaiappan; Togay Ozbakkaloglu; Nikolai Vatin; Maria Karelina; Sergey Klyuev; Aliakbar Gholampour. Fly Ash-Based Eco-Efficient Concretes: A Comprehensive Review of the Short-Term Properties. Materials 2021, 14, 4264 .

AMA Style

Mugahed Amran, Roman Fediuk, Gunasekaran Murali, Siva Avudaiappan, Togay Ozbakkaloglu, Nikolai Vatin, Maria Karelina, Sergey Klyuev, Aliakbar Gholampour. Fly Ash-Based Eco-Efficient Concretes: A Comprehensive Review of the Short-Term Properties. Materials. 2021; 14 (15):4264.

Chicago/Turabian Style

Mugahed Amran; Roman Fediuk; Gunasekaran Murali; Siva Avudaiappan; Togay Ozbakkaloglu; Nikolai Vatin; Maria Karelina; Sergey Klyuev; Aliakbar Gholampour. 2021. "Fly Ash-Based Eco-Efficient Concretes: A Comprehensive Review of the Short-Term Properties." Materials 14, no. 15: 4264.

Review
Published: 25 June 2021 in Materials
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The urbanization process contributes to the growth of solid waste generation and causes an increase in environmental impacts and failures in the management of solid waste. The number of dumps is a concern due to the limited implementation and safe disposal of this waste. The interest in sustainable techniques has been growing in relation to waste management, which is largely absorbed by the civil construction sector. This work aimed to review plastic waste, especially polyethylene terephthalate (PET), that can be incorporated with construction materials, such as concrete, mortars, asphalt mixtures, and paving. The use of life-cycle assessment (LCA) is related, as a tool that allows the sustainability of products and processes to be enhanced in the long term. After analyzing the recent literature, it was identified that studies related to plastic wastes in construction materials concentrate sustainability around the alternative destination of waste. Since the plastic waste from different production chains are obtained, it was possible to affirm the need for a broader assessment, such as the LCA, providing greater quantification of data making the alternative processes and products more sustainable. The study contributes to enhance sustainability in alternative building materials through LCA.

ACS Style

Tulane da Silva; Afonso de Azevedo; Daiane Cecchin; Markssuel Marvila; Mugahed Amran; Roman Fediuk; Nikolai Vatin; Maria Karelina; Sergey Klyuev; Maciej Szelag. Application of Plastic Wastes in Construction Materials: A Review Using the Concept of Life-Cycle Assessment in the Context of Recent Research for Future Perspectives. Materials 2021, 14, 3549 .

AMA Style

Tulane da Silva, Afonso de Azevedo, Daiane Cecchin, Markssuel Marvila, Mugahed Amran, Roman Fediuk, Nikolai Vatin, Maria Karelina, Sergey Klyuev, Maciej Szelag. Application of Plastic Wastes in Construction Materials: A Review Using the Concept of Life-Cycle Assessment in the Context of Recent Research for Future Perspectives. Materials. 2021; 14 (13):3549.

Chicago/Turabian Style

Tulane da Silva; Afonso de Azevedo; Daiane Cecchin; Markssuel Marvila; Mugahed Amran; Roman Fediuk; Nikolai Vatin; Maria Karelina; Sergey Klyuev; Maciej Szelag. 2021. "Application of Plastic Wastes in Construction Materials: A Review Using the Concept of Life-Cycle Assessment in the Context of Recent Research for Future Perspectives." Materials 14, no. 13: 3549.

Journal article
Published: 23 June 2021 in Crystals
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The use of expanded clay aggregate (ECA) for developing lightweight concrete results in strength-reduction properties. However, the ECA-based concrete strength properties can be improved by adding steel fibre (SF), glass fibre mesh (GFM) and multi-walled nano-carbon tubes (MWCNT). The combined effect of MWCNT, GFM, SF and ECA-based concrete and its strength properties is still unexplored. It is worth drawing a logical conclusion concerning the impact on the strength of concrete by incorporating the materials mentioned above. Two-stage expanded clay aggregate fibrous concrete (TECAFC) is a new concrete type and an emerging research area in material engineering. The casting method of TECAFC includes the two essential phases as follows. First, ECA and fibres are filled into the empty cylindrical mould to develop a natural skeleton. Second, the grout comprising cement, sand and MWCNT, are injected into the developed skeleton to fill voids. In this research, eight mixtures were prepared with 0.1 and 0.2% of MWCNT, 2.5% dosage of SF and three different layers of GFM inserted between the two layers of concrete. These eight mixtures were divided into two series of three mixtures each, in addition to two reference mixtures that include no SF or GFM. The first series of mixtures was comprised of 0.1% of MWCNT and 2.5% of SF and one, two and three layers of GFM insertion. The second series was the same as the first series and the dosage of MWCNT was taken as 0.2%. All cylindrical specimens were tested under drop mass impact as per the suggestions made by the ACI Committee 544. The test results showed that incorporating steel fibres and GFM improved the cracking and failure impact resistance by more than 270 and 1100%, respectively, and increased the impact ductility index by more than 220%, significantly contributing to steel fibres.

ACS Style

Gunasekaran Murali; Sallal Abid; Mugahed Amran; Roman Fediuk; Nikolai Vatin; Maria Karelina. Combined Effect of Multi-Walled Carbon Nanotubes, Steel Fibre and Glass Fibre Mesh on Novel Two-Stage Expanded Clay Aggregate Concrete against Impact Loading. Crystals 2021, 11, 720 .

AMA Style

Gunasekaran Murali, Sallal Abid, Mugahed Amran, Roman Fediuk, Nikolai Vatin, Maria Karelina. Combined Effect of Multi-Walled Carbon Nanotubes, Steel Fibre and Glass Fibre Mesh on Novel Two-Stage Expanded Clay Aggregate Concrete against Impact Loading. Crystals. 2021; 11 (7):720.

Chicago/Turabian Style

Gunasekaran Murali; Sallal Abid; Mugahed Amran; Roman Fediuk; Nikolai Vatin; Maria Karelina. 2021. "Combined Effect of Multi-Walled Carbon Nanotubes, Steel Fibre and Glass Fibre Mesh on Novel Two-Stage Expanded Clay Aggregate Concrete against Impact Loading." Crystals 11, no. 7: 720.

Review
Published: 17 June 2021 in Crystals
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Currently, a number of disadvantages hampers the use of recycled concrete aggregates (RCA). The current review proves that concretes made with complete replacement of natural aggregate with RCA allow the production of high-quality concrete. One of the possibilities for improving concrete properties with RCA is the use of extended curing and pozzolanic materials with varying cement ratios. The potential use of RCA concretes is in the production of high-value materials that increase environmental and financial benefits. RCA have strong potential in the development of a new generation of concrete and stimulate economic activity in many countries in addition to optimizing natural resources. Economic benefits include minimal travel costs; cheaper sources of concrete than newly mined aggregates; reduction of the landfill area required for the placement of concrete waste; the use of RCA minimizes the need for gravel extraction, etc. The proposed strategy could be to sequentially separate demolition waste such as roof finishes, waterproof materials, interior and exterior materials, etc. Closing life cycles is the main approach used for efficient structures for the recycling and reuse of construction and demolition waste in the production and recovery of materials, especially when recycling and reusing materials. In the life cycle, the recycling of recovered materials allows them to be used for new construction purposes, avoiding the use of natural concrete aggregates. Government, design institutes, construction departments and project managers should be involved in the creation and use of RCA. In demolition and construction, the main players are the project owners. Their obligations, expectations and responsibilities must be properly aligned. For the past 20 years, recycled concrete aggregate from demolition and construction waste has been considered as an alternative to pure concrete in structural concrete to minimize the environmental impact of construction waste and demolition waste and the conversion of natural aggregate resources. It is now recognized that the use of RCA for the generations of concrete is a promising and very attractive technology for reducing the environmental impact of the construction sector and conserving natural resources. In the market, the selling price is not an obstacle for market applications of RCA, as there are scenarios in which their cost is lower than the cost of products made from conventional building materials. This is more of an acceptance factor in the market for recycled concrete aggregates. In this sector, the lack of identification, accreditation and uniform quality certification systems and their narrow application cause some marketing problems. With proper RCA preparation, concrete with standard physical and mechanical properties and performance characteristics can be obtained.

ACS Style

Natt Makul; Roman Fediuk; Mugahed Amran; Abdullah Zeyad; Sergey Klyuev; Irina Chulkova; Togay Ozbakkaloglu; Nikolai Vatin; Maria Karelina; Afonso Azevedo. Design Strategy for Recycled Aggregate Concrete: A Review of Status and Future Perspectives. Crystals 2021, 11, 695 .

AMA Style

Natt Makul, Roman Fediuk, Mugahed Amran, Abdullah Zeyad, Sergey Klyuev, Irina Chulkova, Togay Ozbakkaloglu, Nikolai Vatin, Maria Karelina, Afonso Azevedo. Design Strategy for Recycled Aggregate Concrete: A Review of Status and Future Perspectives. Crystals. 2021; 11 (6):695.

Chicago/Turabian Style

Natt Makul; Roman Fediuk; Mugahed Amran; Abdullah Zeyad; Sergey Klyuev; Irina Chulkova; Togay Ozbakkaloglu; Nikolai Vatin; Maria Karelina; Afonso Azevedo. 2021. "Design Strategy for Recycled Aggregate Concrete: A Review of Status and Future Perspectives." Crystals 11, no. 6: 695.

Conference paper
Published: 01 June 2021 in IOP Conference Series: Materials Science and Engineering
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The article analyzes the types, methods and techniques of parts processing at restoration and quality criteria of parts of cars, other vehicles and road-building machines in terms of efficiency. Correlations between the quality criteria and the functionality of the part have been established, for which the requirements for machine safety and reliability after the restoration of individual parts have been taken. A mathematical model has been developed in the form of an algorithm for selecting the best variant of the restoration technology for a functionally important part, based on a typical restoration technological process, which consists in the development of a multi-criteria problem, the initial postulates of which are matrices: W "wear resistance → durability"; S "safety → reliability"; F "part fragility → machine safety". New parameters in the form of coefficients describing roughness, hardness and riveting of a part have been proposed. In particular, the authors define the coefficient of technological isotropy of roughness, which evaluates the roughness parameters in the process of technological changes of a part; the coefficient of isotropy of hardness, which compares the hardness parameters on the surface of the part and in the core of it; the coefficient of intensity of hardness, which is a complex parameter and in which there is a change of hardness by the depth of the part and the value of hardness depth (riveting). The purpose of introducing these coefficients is consistent with the model being developed to select the optimal technology for restoring parts of cars, other vehicles and road-building machines.

ACS Style

M Yu Karelina; A I Belyaev; A V Terentev; T Yu Cherepnina. Modeling quality criteria for restoring parts of cars, vehicles and road-building machines. IOP Conference Series: Materials Science and Engineering 2021, 1159, 012073 .

AMA Style

M Yu Karelina, A I Belyaev, A V Terentev, T Yu Cherepnina. Modeling quality criteria for restoring parts of cars, vehicles and road-building machines. IOP Conference Series: Materials Science and Engineering. 2021; 1159 (1):012073.

Chicago/Turabian Style

M Yu Karelina; A I Belyaev; A V Terentev; T Yu Cherepnina. 2021. "Modeling quality criteria for restoring parts of cars, vehicles and road-building machines." IOP Conference Series: Materials Science and Engineering 1159, no. 1: 012073.

Conference paper
Published: 01 June 2021 in IOP Conference Series: Materials Science and Engineering
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The use of corrosion inhibitors based on raw materials of plant origin has been a poorly studied method of metal processing so far. To show the degree of corrosion protection, it is necessary to examine it. It is possible to do this by means of electrochemical research, the method of which consists of several methods: the extrapolation method; the polarization resistance method; the related methods. As a result of this method, a significant advantage of samples treated with corrosion inhibitors based on raw materials of plant origin was revealed.

ACS Style

M Y Karelina; O N Didmanidze. Methods of electrochemical research of corrosion resistance of metal treated with corrosion inhibitors, created on the basis of plant-based raw materials. IOP Conference Series: Materials Science and Engineering 2021, 1159, 012086 .

AMA Style

M Y Karelina, O N Didmanidze. Methods of electrochemical research of corrosion resistance of metal treated with corrosion inhibitors, created on the basis of plant-based raw materials. IOP Conference Series: Materials Science and Engineering. 2021; 1159 (1):012086.

Chicago/Turabian Style

M Y Karelina; O N Didmanidze. 2021. "Methods of electrochemical research of corrosion resistance of metal treated with corrosion inhibitors, created on the basis of plant-based raw materials." IOP Conference Series: Materials Science and Engineering 1159, no. 1: 012086.

Review
Published: 30 May 2021 in Buildings
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The global sustainable construction aimed to minimize the ecological impacts of constructed facilities’ lifetime. In construction, concretes are the major materials utilized in South East Asia. Thus, it makes environmental and economic sense to utilize recycled materials in the production of new concretes for diverse uses. This review indicated that the practical implementations of the recycled aggregate concretes (RAC) in the area is greatly lacking, even though there are reasonable studies on RAC, particularly because of lack awareness and economic viability of such uses at the present period. This research aims to establish an interdisciplinary consortium with researchers, policy makers, practitioners, and social scientists in Southeast Asia to investigate the development of sustainable, durable, cost-effective, green concrete by utilizing recycled aggregates. Concentrating on waste resource recovery, this research presents an integrated modeling method. The approaches track and forecast a variety of values across technical, economic, social, and environmental areas linking these to the material flow and therefore integrating and building upon one-dimensional models like life cycle assessments (LCAs) and material flow analyses (MFAs). Additionally, the analysis of this study supported the recycling of cement for general use in construction, emphasizing the feasibility, reliability, and longevity of a project at the same time. However, the analysis also demonstrated that although there is fair progress on recycled concrete, there is still a severe lack of appropriate development in particular because of the lack of economic sustainability and knowledge of such applications at present. Raw material conservations were recorded; carbon dioxide costs and footprint were also reduced. Considering the RAC economic, technical, and environmental parameters, frameworks were applied for sustainable selections with target compressive strengths as the major goal.

ACS Style

Natt Makul; Roman Fediuk; Mugahed Amran; Abdullah Zeyad; Afonso de Azevedo; Sergey Klyuev; Nikolai Vatin; Maria Karelina. Capacity to Develop Recycled Aggregate Concrete in South East Asia. Buildings 2021, 11, 234 .

AMA Style

Natt Makul, Roman Fediuk, Mugahed Amran, Abdullah Zeyad, Afonso de Azevedo, Sergey Klyuev, Nikolai Vatin, Maria Karelina. Capacity to Develop Recycled Aggregate Concrete in South East Asia. Buildings. 2021; 11 (6):234.

Chicago/Turabian Style

Natt Makul; Roman Fediuk; Mugahed Amran; Abdullah Zeyad; Afonso de Azevedo; Sergey Klyuev; Nikolai Vatin; Maria Karelina. 2021. "Capacity to Develop Recycled Aggregate Concrete in South East Asia." Buildings 11, no. 6: 234.

Conference paper
Published: 01 April 2021 in Recent Advances in Computational Mechanics and Simulations
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The evaluation of rolling resistance of automobile tires, as well as the determination of the coefficient of resistance to lateral withdrawal, is often performed on drum stands. It is also becoming increasingly common to test cars on drum stands of different designs: with different numbers of drums, their location and type of drive. This raises the problem of determining the power and kinematic characteristics of the wheel when it rolls on the drum, since these issues are not reflected in the literature. These problems can be solved, considering that the rolling mechanics of the elastic wheel on the drum is the same as when the wheel is rolling on a flat rigid support surface. In early research of the authors, general questions of the mechanics of rolling a wheel on a drum are considered in detail, considering the friction interaction of the “wheel-drum” pair. However, the question of the points of application of tangent and normal forces in contact with the drum and, accordingly, the shoulders of these forces relative to the wheel axis was not disclosed. These values are necessary, in particular, when considering the rolling of cars during tests on drum stands. In this paper, the authors derive dependencies for determining the point of application of the tangent force in contact and its shoulder relative to the wheel axis.

ACS Style

M. U. Karelina; T. A. Balabina; A. N. Mamaev. Determination of Point of Application of Tangent Force in Contact of Wheel with Drum and Its Arm Relative to Wheel Axis. Recent Advances in Computational Mechanics and Simulations 2021, 79 -88.

AMA Style

M. U. Karelina, T. A. Balabina, A. N. Mamaev. Determination of Point of Application of Tangent Force in Contact of Wheel with Drum and Its Arm Relative to Wheel Axis. Recent Advances in Computational Mechanics and Simulations. 2021; ():79-88.

Chicago/Turabian Style

M. U. Karelina; T. A. Balabina; A. N. Mamaev. 2021. "Determination of Point of Application of Tangent Force in Contact of Wheel with Drum and Its Arm Relative to Wheel Axis." Recent Advances in Computational Mechanics and Simulations , no. : 79-88.

Journal article
Published: 31 March 2021 in Crystals
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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.

ACS Style

Valery Lesovik; Liliya Zagorodnyuk; Vladislav Ryzhikh; Ruslan Lesovik; Roman Fediuk; Nikolai Vatin; Maria Karelina. Granular Aggregates Based on Finely Dispersed Substandard Raw Materials. Crystals 2021, 11, 369 .

AMA Style

Valery Lesovik, Liliya Zagorodnyuk, Vladislav Ryzhikh, Ruslan Lesovik, Roman Fediuk, Nikolai Vatin, Maria Karelina. Granular Aggregates Based on Finely Dispersed Substandard Raw Materials. Crystals. 2021; 11 (4):369.

Chicago/Turabian Style

Valery Lesovik; Liliya Zagorodnyuk; Vladislav Ryzhikh; Ruslan Lesovik; Roman Fediuk; Nikolai Vatin; Maria Karelina. 2021. "Granular Aggregates Based on Finely Dispersed Substandard Raw Materials." Crystals 11, no. 4: 369.

Journal article
Published: 01 March 2021 in Revista on line de Política e Gestão Educacional
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The article discusses the issues of improving the professionalism of a higher education teacher; it also describes activities designed to improve the quality of the educational process, and the role of the leadership of an educational organization in the formation of a teacher. Initial knowledge, skills, abilities and qualities are formed by the teacher in the process of his or her professional activity and during the part of his or her life that precedes work in an educational institution. Professional qualities actively develop only with the beginning of teaching activities. The development of the initiative and the creative search in the work of a teacher is of particular relevance, because improving the quality of training cannot be achieved by simply increasing the working time of teachers and the study time of students. New teaching methods and new techniques for developing the students' creative activity are needed, which would allow them to achieve high results. Moreover, the state’s policy should include real material and moral support for a creatively working teacher of an educational institution, including teachers at higher schools.

ACS Style

Irina V. Tenentyeva; Anastasia V. Fakhrutdinova; Maria Y. Karelina; Ekaterina A. Karelina; Igor V. Gaidamashko. Peculiarities and stages of Higher School teacher formation. Revista on line de Política e Gestão Educacional 2021, 547 -556.

AMA Style

Irina V. Tenentyeva, Anastasia V. Fakhrutdinova, Maria Y. Karelina, Ekaterina A. Karelina, Igor V. Gaidamashko. Peculiarities and stages of Higher School teacher formation. Revista on line de Política e Gestão Educacional. 2021; ():547-556.

Chicago/Turabian Style

Irina V. Tenentyeva; Anastasia V. Fakhrutdinova; Maria Y. Karelina; Ekaterina A. Karelina; Igor V. Gaidamashko. 2021. "Peculiarities and stages of Higher School teacher formation." Revista on line de Política e Gestão Educacional , no. : 547-556.

Journal article
Published: 01 March 2021 in Fibers
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Acid treatment is commonly used to improve the dispersion of carbon nanotubes (CNT) in a cementitious matrix, but it causes undesired delay on cement hydration kinetics. This work reports a combined CNT functionalization method with H2SO4/HNO3 and Ca(OH)2 for addition in a cementitious matrix. Results showed that the Ca(OH)2 exposure neutralized the active sites generated by acid exposure, compensating the delay in hydration. As a result, CNT exposed to H2SO4/HNO3 for 9 h and further Ca(OH)2 treatment led to equivalent hydration kinetics than un-treated CNT did with improved stability.

ACS Style

Eduardo Batiston; Paulo de Matos; Philippe Gleize; Roman Fediuk; Sergey Klyuev; Nikolai Vatin; Maria Karelina. Combined Functionalization of Carbon Nanotubes (CNT) Fibers with H2SO4/HNO3 and Ca(OH)2 for Addition in Cementitious Matrix. Fibers 2021, 9, 14 .

AMA Style

Eduardo Batiston, Paulo de Matos, Philippe Gleize, Roman Fediuk, Sergey Klyuev, Nikolai Vatin, Maria Karelina. Combined Functionalization of Carbon Nanotubes (CNT) Fibers with H2SO4/HNO3 and Ca(OH)2 for Addition in Cementitious Matrix. Fibers. 2021; 9 (3):14.

Chicago/Turabian Style

Eduardo Batiston; Paulo de Matos; Philippe Gleize; Roman Fediuk; Sergey Klyuev; Nikolai Vatin; Maria Karelina. 2021. "Combined Functionalization of Carbon Nanotubes (CNT) Fibers with H2SO4/HNO3 and Ca(OH)2 for Addition in Cementitious Matrix." Fibers 9, no. 3: 14.

Review
Published: 08 February 2021 in Crystals
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In the last few decades, the demand for cement production increased and caused a massive ecological issue by emitting 8% of the global CO2, as the making of 1 ton of ordinary Portland cement (OPC) emits almost a single ton of CO2. Significant air pollution and damage to human health are associated with the construction and cement industries. Consequently, environmentalists and governments have ordered to strongly control emission rates by using other ecofriendly supplemental cementing materials. Rice husk is a cultivated by-product material, obtained from the rice plant in enormous quantities. With no beneficial use, it is an organic waste material that causes dumping issues. Rice husk has a high silica content that makes it appropriate for use in OPC; burning it generates a high pozzolanic reactive rice husk ash (RHA) for renewable cement-based recyclable material. Using cost-effective and commonly obtainable RHA as mineral fillers in concrete brings plentiful advantages to the technical characteristics of concrete and to ensure a clean environment. With RHA, concrete composites that are robust, highly resistant to aggressive environments, sustainable and economically feasible can be produced. However, the production of sustainable and greener concrete composites also has become a key concern in the construction industries internationally. This article reviews the source, clean production, pozzolanic activity and chemical composition of RHA. This literature review also provides critical reviews on the properties, hardening conditions and behaviors of RHA-based concrete composites, in addition to summarizing the research recent findings, to ultimately produce complete insights into the possible applications of RHA as raw building materials for producing greener concrete composites—all towards industrializing ecofriendly buildings.

ACS Style

Mugahed Amran; Roman Fediuk; Gunasekaran Murali; Nikolai Vatin; Maria Karelina; Togay Ozbakkaloglu; R. S. Krishna; Ankit Kumar S.; Shaswat Kumar D.; Jyotirmoy Mishra. Rice Husk Ash-Based Concrete Composites: A Critical Review of Their Properties and Applications. Crystals 2021, 11, 168 .

AMA Style

Mugahed Amran, Roman Fediuk, Gunasekaran Murali, Nikolai Vatin, Maria Karelina, Togay Ozbakkaloglu, R. S. Krishna, Ankit Kumar S., Shaswat Kumar D., Jyotirmoy Mishra. Rice Husk Ash-Based Concrete Composites: A Critical Review of Their Properties and Applications. Crystals. 2021; 11 (2):168.

Chicago/Turabian Style

Mugahed Amran; Roman Fediuk; Gunasekaran Murali; Nikolai Vatin; Maria Karelina; Togay Ozbakkaloglu; R. S. Krishna; Ankit Kumar S.; Shaswat Kumar D.; Jyotirmoy Mishra. 2021. "Rice Husk Ash-Based Concrete Composites: A Critical Review of Their Properties and Applications." Crystals 11, no. 2: 168.

Journal article
Published: 29 January 2021 in Metals
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An experimental investigation is performed on various cold-formed profiled sheets to study the connection behavior of composite deck slab actions using bolted shear connectors. Various profiles like dovetailed (or) re-entrant profiles, rectangular profiles and trapezoidal profiles are used in the present investigation. This experimental investigation deals with the evaluation of various parameters such as the ultimate load carrying capacity versus deflection, load versus slip, ductility ratio, strain energy and modes of failure in composite slab specimens with varying profiles. From the test results the performance of dovetailed profiled composite slabs’ resistance is significantly higher than the other two profiled composite deck slabs.

ACS Style

Siva Avudaiappan; Erick I. Saavedra Flores; Gerardo Araya-Letelier; Walter Jonathan Thomas; Sudharshan N. Raman; Gunasekaran Murali; Mugahed Amran; Maria Karelina; Roman Fediuk; Nikolai Vatin. Experimental Investigation on Composite Deck Slab Made of Cold-Formed Profiled Steel Sheeting. Metals 2021, 11, 229 .

AMA Style

Siva Avudaiappan, Erick I. Saavedra Flores, Gerardo Araya-Letelier, Walter Jonathan Thomas, Sudharshan N. Raman, Gunasekaran Murali, Mugahed Amran, Maria Karelina, Roman Fediuk, Nikolai Vatin. Experimental Investigation on Composite Deck Slab Made of Cold-Formed Profiled Steel Sheeting. Metals. 2021; 11 (2):229.

Chicago/Turabian Style

Siva Avudaiappan; Erick I. Saavedra Flores; Gerardo Araya-Letelier; Walter Jonathan Thomas; Sudharshan N. Raman; Gunasekaran Murali; Mugahed Amran; Maria Karelina; Roman Fediuk; Nikolai Vatin. 2021. "Experimental Investigation on Composite Deck Slab Made of Cold-Formed Profiled Steel Sheeting." Metals 11, no. 2: 229.

Journal article
Published: 29 January 2021 in Buildings
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Wooden multi-span beams with steel reinforcement were studied experimentally on a stationary stand using an eight-point loading scheme that simulated a load uniformly distributed over the beam span. The studies were carried out on beams with a span of 4.8 m with a cross-sectional area of 40 mm × 80 mm, reinforced in the stretched zones of the cross-section with rods made of hot-rolled steel reinforcement of A400 class. The rational zones for the location of reinforcements in the tensioned and compressed zones of the beams were determined. The rational placements of reinforcement in the support and span zones was based on the numerical simulation of the volumetric stress state calculated using the finite element method. It was experimentally confirmed that the failure of wood composite beams had a plastic nature and occurred only along normal sections. This excluded the possibility of brittle fracture from shear stresses and ensured the operational reliability of structures as a whole. It was shown that the proposed rational reinforcement of wooden beams increased their bearing capacity by 175% and reduced bearing deformability by 85%. The results obtained indicated high efficiency of the application of the developed method of reinforcement in beams of roofs and floors of buildings.

ACS Style

Mikhail Lukin; Evgeny Prusov; Svetlana Roshchina; Maria Karelina; Nikolay Vatin. Multi-Span Composite Timber Beams with Rational Steel Reinforcements. Buildings 2021, 11, 46 .

AMA Style

Mikhail Lukin, Evgeny Prusov, Svetlana Roshchina, Maria Karelina, Nikolay Vatin. Multi-Span Composite Timber Beams with Rational Steel Reinforcements. Buildings. 2021; 11 (2):46.

Chicago/Turabian Style

Mikhail Lukin; Evgeny Prusov; Svetlana Roshchina; Maria Karelina; Nikolay Vatin. 2021. "Multi-Span Composite Timber Beams with Rational Steel Reinforcements." Buildings 11, no. 2: 46.

Journal article
Published: 29 January 2021 in Polymers
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The polymer deformability under load and heating is the determining factor in calculating reinforced polymer structures used under heating. Deformability–load/temperature relations make it possible to calculate temperature stresses and deformations in bearing cross-sections of polymer structures such as chimneys, smokestacks, etc. The present study suggests a method of calculating deformability of polymers subjected to the temperature loads. The method is based on the structure model of pack or layer bonded polymer domains where the elasticity of rigid bonds decreases with heating according to entropy principles. The method has been successfully tested on various polymers and compounds with due account for the effect of mineral additives on the deformation modulus increase.

ACS Style

Alexander Korolev; Maxim Mishnev; Dmitry Zherebtsov; Nikolai Vatin; Maria Karelina. Polymers under Load and Heating Deformability: Modelling and Predicting. Polymers 2021, 13, 428 .

AMA Style

Alexander Korolev, Maxim Mishnev, Dmitry Zherebtsov, Nikolai Vatin, Maria Karelina. Polymers under Load and Heating Deformability: Modelling and Predicting. Polymers. 2021; 13 (3):428.

Chicago/Turabian Style

Alexander Korolev; Maxim Mishnev; Dmitry Zherebtsov; Nikolai Vatin; Maria Karelina. 2021. "Polymers under Load and Heating Deformability: Modelling and Predicting." Polymers 13, no. 3: 428.

Journal article
Published: 22 January 2021 in Crystals
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The self-compacting concrete (SCC) was invented to overcome the compaction problems in deep sections, owing to its perfect workability characteristics. Steel fibers when used with SCC would affect the required fluidity characteristics but improve its impact resistance. In this research, an experimental work was conducted to evaluate the impact response of micro-steel fiber-reinforced SCC, under flexural impact. A 5.47 kg free-falling mass was dropped repeatedly from 100 mm height on the top center of 270 mm-length beam specimens. Eight mixtures with two design grades of 30 and 50 MPa were prepared to distinguish the normal and high-strength SCCs. The distinguishing variable for each design grade was the fiber content, where four volumetric contents of 0%, 0.5%, 0.75%, and 1.0% were used. The test results showed that the impact resistance and ductility were significantly improved due to the incorporation of micro-steel fibers. The percentage improvements were noticeably higher at failure stage than at cracking stage. For the 30 MPa mixtures, the maximum percentage improvements at cracking and failure stages were 543% and 836%, respectively. Weibull’s linear correlations with R2 values of 0.84 to 0.97 were obtained at the failure stage, which meant that the impact failure number followed the Wiebull distribution.

ACS Style

Sallal R. Abid; Murali Gunasekaran; Sajjad H. Ali; Ahmed L. Kadhum; Thaar S. Al-Gasham; Roman Fediuk; Nikolai Vatin; Maria Karelina. Impact Performance of Steel Fiber-Reinforced Self-Compacting Concrete against Repeated Drop Weight Impact. Crystals 2021, 11, 91 .

AMA Style

Sallal R. Abid, Murali Gunasekaran, Sajjad H. Ali, Ahmed L. Kadhum, Thaar S. Al-Gasham, Roman Fediuk, Nikolai Vatin, Maria Karelina. Impact Performance of Steel Fiber-Reinforced Self-Compacting Concrete against Repeated Drop Weight Impact. Crystals. 2021; 11 (2):91.

Chicago/Turabian Style

Sallal R. Abid; Murali Gunasekaran; Sajjad H. Ali; Ahmed L. Kadhum; Thaar S. Al-Gasham; Roman Fediuk; Nikolai Vatin; Maria Karelina. 2021. "Impact Performance of Steel Fiber-Reinforced Self-Compacting Concrete against Repeated Drop Weight Impact." Crystals 11, no. 2: 91.

Journal article
Published: 12 January 2021 in Materials
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This research aims to examine the fracture toughness of hybrid fibrous geopolymer composites under mode II. For this purpose, eight geopolymer mixtures were cast and tested to evaluate the influence of steel and synthetic fiber hybridization on mode II fracture response. The first mixture was plain and was kept as a reference, while steel, polypropylene and glass fibers were used in the rest seven mixtures. The first three of which were mono-reinforced with one of the three fibers, while the rest of the four were hybrids reinforced with combinations of steel and synthetic fibers. The Brazilian center notched disc and the double notched cube test configurations were used to evaluate the mode II fracture toughness of the eight mixtures. The results of the tests showed that steel fibers played the vital role in enhancing the fracture toughness, where the mixtures S1.6 and S1.3G0.3 showed the best performance. The results also showed that increasing the notch depth decreased the fracture toughness with an approximate linear decrement fashion. It was found that the use of double-notched cubes resulted in much higher fracture toughness than the Brazilian notched discs, where the ratio of normalized fracture toughness of the disc specimens to cube specimens was approximately 0.37 to 0.47. This is attributed to the concentration of stresses along one defined path in the disc specimens compared to the multi-path stresses in the cube specimens. In addition, the accompanied tensile stresses in the disc specimens may lead to a mode I fracture before the designed mode II fracture.

ACS Style

Sallal R. Abid; Gunasekaran Murali; Mugahed Amran; Nikolai Vatin; Roman Fediuk; Maria Karelina. Evaluation of Mode II Fracture Toughness of Hybrid Fibrous Geopolymer Composites. Materials 2021, 14, 349 .

AMA Style

Sallal R. Abid, Gunasekaran Murali, Mugahed Amran, Nikolai Vatin, Roman Fediuk, Maria Karelina. Evaluation of Mode II Fracture Toughness of Hybrid Fibrous Geopolymer Composites. Materials. 2021; 14 (2):349.

Chicago/Turabian Style

Sallal R. Abid; Gunasekaran Murali; Mugahed Amran; Nikolai Vatin; Roman Fediuk; Maria Karelina. 2021. "Evaluation of Mode II Fracture Toughness of Hybrid Fibrous Geopolymer Composites." Materials 14, no. 2: 349.

Journal article
Published: 07 January 2021 in Materials
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Preplaced Aggregate Fibrous Concrete (PAFC) is a newly minted composite that has recently become more popular. The production of PAFC involves two essential processes; first, the fibres and coarse aggregate were filled into the empty framework to form the first layer of a natural skeleton, followed by grout injecting. A cement grout fills the voids in the first layer skeleton with slight compaction. This process is repeated to complete the remaining layers; hence, a type of Functionally-graded Preplaced Aggregate Fibrous Concrete (FPAFC) is obtained. The most recent studies revealed that the literature regarding the high-velocity projectile impact on fibrous concrete is well documented; however, the low-velocity repeated projectile impact on PAFC is still unexplored and needs particular emphasis. This research aims to investigate the FPAFC made with a new type of steel and polypropylene fibres against low-velocity projectile impact to fill this research gap. In the current study, twelve mixes were prepared with mono and hybrid combinations of fibres for pioneering the possible utilization of fibres in FPAFC. The maximum fibre dosage in this study is limited to 2.4%. The projectile impact resistance of FPAFC was assessed in line with penetration depth, front and rear damage surface area, weight loss, damage ratio and failure pattern. Additionally, a simplified analytical model was introduced to compute the ejected composite mass from the tested specimens. The results revealed that the addition of steel fibre in a single layer FPAFC exhibited an increasing compressive strength trend compared to the two/three-layered FPAFC. Furthermore, increasing the dosage of fibre at the bottom and top layers of FPAFC with a hybrid combination alleviates the spalling with an increasing number of impacts. The results from this research offer the reference information for more detailed research and studies of FPAFC under low-velocity projectile impact.

ACS Style

Nandhu Prasad; Gunasekaran Murali; Roman Fediuk; Nikolai Vatin; Maria Karelina. Response of Novel Functionally-Graded Prepacked Aggregate Fibrous Concrete against Low Velocity Repeated Projectile Impacts. Materials 2021, 14, 280 .

AMA Style

Nandhu Prasad, Gunasekaran Murali, Roman Fediuk, Nikolai Vatin, Maria Karelina. Response of Novel Functionally-Graded Prepacked Aggregate Fibrous Concrete against Low Velocity Repeated Projectile Impacts. Materials. 2021; 14 (2):280.

Chicago/Turabian Style

Nandhu Prasad; Gunasekaran Murali; Roman Fediuk; Nikolai Vatin; Maria Karelina. 2021. "Response of Novel Functionally-Graded Prepacked Aggregate Fibrous Concrete against Low Velocity Repeated Projectile Impacts." Materials 14, no. 2: 280.

Journal article
Published: 01 January 2021 in Journal of Machinery Manufacture and Reliability
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This work presents the results of studying of characteristics of wear resistance of gas-dynamic coatings obtained using electroerosive carbides, prepared by the method of electroerosive dispersing from wastes of VK8 hard alloys in distilled water and illuminating kerosene. Worn plates of the cutting tool from sintered hard alloys of the brand VK8 were used as dispersed material as well as electrodes. Samples with coatings from VK8 powders were prepared on the surface of metal products on a specialized plant for superfast gas-dynamic formation. The results obtained showed that the coatings obtained using electroerosive carbides, prepared by the method of electroerosive dispersion from wastes of hard alloys VK8 in water and illuminating kerosene, possess the best wear resistance due to the significantly higher content of free carbon.

ACS Style

E. V. Ageev; S. B. Benevolenskii; M. Yu. Karelina; A. N. Novikov. Comparative Characteristics of Wear Resistance of Gas-Dynamic Coatings Obtained Using Electroerosive Carbides. Journal of Machinery Manufacture and Reliability 2021, 50, 46 -50.

AMA Style

E. V. Ageev, S. B. Benevolenskii, M. Yu. Karelina, A. N. Novikov. Comparative Characteristics of Wear Resistance of Gas-Dynamic Coatings Obtained Using Electroerosive Carbides. Journal of Machinery Manufacture and Reliability. 2021; 50 (1):46-50.

Chicago/Turabian Style

E. V. Ageev; S. B. Benevolenskii; M. Yu. Karelina; A. N. Novikov. 2021. "Comparative Characteristics of Wear Resistance of Gas-Dynamic Coatings Obtained Using Electroerosive Carbides." Journal of Machinery Manufacture and Reliability 50, no. 1: 46-50.