Roman Fediuk

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Verified

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• PhD, Full Professor
• Professor (Full) at Far Eastern Federal University

Composite materials are the basic materials in contemporary engineering. A great body of research publications covers the composite materials based on polymer, metal, and ceramic matrices; however, data are scarce on the specific application of mineral binding materials as matrices. On the one hand, this review paper is aimed at analyzing the infor...

Polymer Nanocomposites Based on Nanosilica. Editors: Prof. Vera V. Masoedova, Semenov's Institute of Chemical Physics, Russian Academy of Sciences, Moscow; Dr. Sabu Thomas, Indian Institute of Nanotechnology; Dr. Hanna J. Maria, India. Abstract. Silica nanoparticles are formed in hydrothermal solution as a result of orthosilicic acid polymerizati...

The possibility of using phytoremediant plants as a source of the most important elements of soil nutrition and to obtain fertilizers with a valuable composition of microelements has been considered. Data have been presented on the accumulation of potassium, calcium and ferrum in the tissues of phytoremediant plants Phragmites australis (Cav.) Trin...

Purpose The study suggests that the high concentration of mining and metallurgical enterprises on the territory of the Russian Ural region determines the need to consider industrial waste, including nickel slag, as a possible raw material for the production of ceramic bricks. The article describes the properties of clays and nickel slag obtained at...

Bentonite, a non-metallic mineral mainly composed of montmorillonite, has been found to be effective in preventing explosion propagations. However, it is prone to absorbing water, leading to the issue of solidifying into lumps (caking problems) and reducing its ability to entrain in the pressure front of an explosion for stopping propagation. In th...

Introduction. Technological features of road construction require compliance with the requirements for road building materials in terms of physical and mechanical properties and performance characteristics. Control of structure formation processes in cement composite systems can be carried out by various methods and approaches, including choosing t...

The enhancement of mechanical properties in reinforced concrete beams remains a pivotal focus in modern structural engineering. In the pursuit of innovative solutions, recent studies have explored the potential of 3D-printing technology to reinforce cementitious materials. However, challenges persist in optimizing this approach. This study investig...

Analysing the main indicators of the territorial road network development level of our country, we come to the conclusion that it requires a large-scale re-equipment. A wide range of mixtures with high penetrating ability from composite binders ground to Ssw = 500 m2/kg has been developed. The viscosity characteristic of the developed materials tes...

закрепление просадочных грунтов является важной практической научнотехнической задачей, позволяющей осуществлять строительные и ремонтные работы на слабых (просадочных) грунтах оснований. Разработаны композиционные цементы (КЦ), включающие алюмосиликаты (АС), полученные обогащением золошлаковой смеси (до 65 мас. %), портландцементный клинкер и гипс...

This study involves the preparation of cement grout samples by varying proportions of superplasticizer (SP) and water-cement (w/c) ratio (0.25–0.45) which were tested for computing flow value and 1-day, 7-day, and 28-day compressive strength. With 75 data points a neural network model was developed to predict the 28-day compressive strength based...

Currently in Kamchatka there is an intensive development of the tourist and recreational cluster “Three Volcanoes”, engineering and social infrastructure, and in the conditions of active construction, there is a sharp demand for building materials, in particular for building stone and inert aggregates for concrete: crushed stone, sand, as well as s...

This study analyzes the precious data from the literature on bond strength between concrete and CFRP bars associated with the pullout test. In this regard, an overview of the pullout test and bond stress-slip model, along with a systematic analysis of characteristic bond strength behavior, were reviewed extensively. Over 273 specimens of CFRP bar i...

Directed control of the process of structure formation of a cement composite from modern positions must be carried out taking into account the synergistic effect of its components. In particular, the cement composite, when applied with pozzolanic additives and fiber reinforcement, is transformed into a more complex material with excellent performan...

Recently, several scientists have paid special attention to how high temperatures alter the chemical and physical features of reinforced concrete structural members such as slabs. Cantilever concrete slabs, the impact of cooling regimes, the influence of the crack created during heating, and the residual strength of concrete slabs subjected to extr...

A control of a cement composite structure formation from modern positions should be carried out taking into account the synergistic effect of its components. The goal of the article is to study the combined effect of nanomodified basalt fiber (NBF) and bottom ash (BA) as structural elements of concrete using a two-factor analysis of variance ANOVA....

The current experimental research encompasses the outcome of the pre-treatment of rubber fiber (RF) derived from discarded tires when utilized in concrete as a limited substitution of sand by its volume. To overcome the causes of reduction in strengths of concrete after inclusion of rubber particles (RP) as fractional or complete replacement of fin...

Portland cement production is related to environmental problems and corresponds to about 6-8% of CO2 emission. Thus, it is necessary to search for sustainable material. Among these materials are geopolymers. The objective of this research was to analyze the potential of producing a geopolymeric paste based on metakaolin (MK) and Flue Gas Desulfuriz...

Composite materials are characterized by multiple layers, which leads to a complexity in the design in order to ensure the effective operation of the constituent elements. This article provides information on the use of fractal dimension in assessing the quality of the appearance of paint coatings. The scientific originality of the article lies in...

Concrete is the most widely used and inexpensive material in the construction sector. However, due to its weakness in tension, the cracking and brittle fracturing of concrete is considered a major deficiency. Advancements in fibrous concretes have recently been emerged to mitigate this issue. Preplaced Aggregate Fibrous Concrete (PAFC) and Slurry I...

The abundance of waste foundry sand (WFS) produced by the foundry industry has become a global issue. As a result, foundry waste management and disposal are getting more complex, necessitating more extensive and inventive efforts. The purpose of this study was to use WFS as a partial replacement to reduce the use of fine aggregate in various concre...

The idea of managing and recycling electronic waste is getting broad acceptance because it is a resource that is rapidly available in bulk, contains various hazardous substances and has a low recycling rate. Meanwhile, increasing industrialization and urbanization has increased concrete production and consumption, resulting in environmental problem...

The paper presents experimental research results of prestressed shells’ operation features taking into account temperature load effect on the preliminary structure state. It is established that with an increase in temperature loads on the structure, the degree of tension in the prestressed structure changes downward. In accordance with the research...

This paper presents a technology for applying copper and silver films to cotton fabrics by combining photochemical and chemical methods for the reduction of the compounds of these metals. The resulting metal-containing films have inherent electrical conductivity of metals. All the main processes described in the work were carried out by means of th...

The modern construction revolution throughout the past two decades has brought the need for ground vibration mitigation, and this has been one of the major study areas. These studies were mainly focused on the effect of forestation on vibration reduction as the available natural metamaterial. Physical methods such as the finite element method and t...

Fibrous high-strength concrete by means of natural and technogenic raw materials is in demand for sustainable construction. The scientific novelty of this study lies in the expansion of the range of applied natural raw materials locally available for polymineral binders, instead of using manufactured or rare materials. This research aimed to improv...

This Special Issue (SI), “Recyclable Materials for Ecofriendly Technology,” has been proposed and organized as a means to present recent developments in the field of environmentally friendly designed construction and building materials. For this purpose, dozens of articles were included or considered for inclusion in this SI, covering various aspec...

The aim of the paper is to development of basalt fiber-reinforced high-strength eco-friendly concrete with modified composite binder for sustainable construction. Cement composites based on a modified polymineral binder with the use of enriched aluminosilicates obtained from coal ash have been developed. A technology has been developed for extracti...

During mining, only 4–8% is converted to final products, and the rest is accumulated in landfills. There is a lack of research on the study of various patterns and mechanisms of the formation of cement clinker minerals during the simultaneous distillation of zinc. This paper presents studies of thermodynamic stimulation of environmental and populat...

The cement industry is recognized as an environmental nuisance, and so there is a need to not only minimizes the consumption of cement, but also to completely recycle the waste of the cement industry. This paper’s originality lies in the fact that, for the first time, a comprehensive study of the structure formation of alkali-activated materials (A...

Increasing the percentage of recycling of various industrial waste is an important step towards caring for the environment. Coal ash is one of the most large-tonnage wastes, which is formed as a result of the operation of thermal power plants. The aim of this work is to develop a technology for the complex processing of coal ash. The tasks to achie...

Modern materials science is aimed towards abandoning Portland cement in the production of building materials. The scientific novelty of this study lies in its being the first time a comprehensive study of the structure formation of alkali-activated materials (AAM) based on thermally treated marl and Na2SiO3 is carried out. The tasks for achieving t...

In the study, experimental and theoretical studies were carried out to assess the influence of the vertical mounting joint zone of the tank on the stress-strain state of the defect zone. Thus, experimental tests of models of a tank wall fragment with an imperfection of the mounting joint evaluated the stress-strain state of the mounting joint zone...

Due to renovation and fighting in the world, a huge accumulation of construction and demolition waste is formed. These materials are effectively used as aggregates, but there is very little information about the use of scrap concrete to create cementless binders. The purpose of the work is to be a comprehensive study of the composition and properti...

The modern energy-saving vector of development in building materials science is being implemented in a complex way through the development of new heat-insulating materials with the simultaneous exclusion of low-ecological cement from them. This article presents the results of the development of resource-saving technology for a heat-insulating compo...

In the study, experimental and theoretical studies were carried out to assess the influence of the shapes of dents in the tank wall on the stress-strain state of the defect zone. By testing fragments of a cylindrical tank, it was found that the most appropriate expression is (5), which could take into account the leaching of the tank wall, resultin...

Concrete is the most extensively utilized and cheapest building material. The cracking and fracturing of concrete may cause catastrophic harm to the structures. Advancements in fibrous concretes have recently been emerged to mitigate these issues. Two-Stage Fibrous Concrete (TSFC) is a new cement composite made of fibres with surpassing mechanical...

The hybrid type of pavement called semi-flexible or grouted macadam has gained popularity over the last few decades in various countries, as it provides significant advantages over both rigid and conventional flexible pavements. The semi-flexible pavement surface consists of an open-graded asphalt mixture with high percentage voids into which flowa...

Erection of buildings using 3D printing has great potential. However, its mass use for high-rise buildings is hampered by the lack of cement mortars with the required technical characteristics, the most important of which is high plastic strength (in the first minutes after pouring). The significance of the work (novelty) lies in the creation of a...

Achieving net-zero emissions requires rapid decarbonization and improved strategies implemented at the global level. In response to increasing demand for better structures and foundations, the concrete industry now relies on heating furnaces to over 1400 °C by burning fossil fuels and other cementitious materials, accounting for about 7–8% of carbo...

Autoclaved aerated concrete (AAC) is one of the most common types of lightweight cellular concrete, having a density of approximately one-fourth of that of conventional plain cement concrete. The use of industrial waste materials in concrete as a replacement for cement has garnered a lot of attention in recent years as a way to reduce the environme...

A promising method of obtaining mineral fiber fillers for dry building mixtures is the processing of waste that comes from the production of technogenic fibrous materials (TFM). The novelty of the work lies in the fact that, for the first time, basalt production wastes were studied not only as reinforcing components, but also as binder ones involve...

In the search for better constructive efficiency and a reduction of the waste of construction materials, several researches have been performed in the last years around the world. Red ceramic blocks are artifacts widely used in civil construction around the world, and they result in a great consumption of raw materials and energy. The great innovat...

This paper describes the results of a study on the influence of mesoporous silica of the Mobil composition of matter No. 41 (MCM-41) structure type on the early-age properties of the cement matrix (CM) and the microstructure development. To date, no studies related to the use of MCM-41 to modify the CM structure have been reported in the literature...

The paper presents the results of experimental studies of the features of the operation of prestressed shells, taking into account the various structural parameters of the prestress. It is established that when the winding angle changes from perpendicular to the shell axis to 75° and 65°, the circumferential stresses decrease 1.4 times and 1.2 time...

This article describes a technology for the thermomechanical treatment of stainless-steel piston rings. This technology makes it possible to obtain rings with an optimal combination of plastic and strength properties that is essential for piston rings. The following thermomechanical treatment is suggested for piston rings manufacturing: quenching a...

Finding new ways of recycling production waste to improve the characteristics of various building materials is an urgent scientific task. This article substantiates the possibility of the disposal of fly ash in the composition of soil concrete, which is used in the construction of the structural layers of road pavements, foundations of buildings an...

Nuclear energy offers a wide range of applications, which include power generation, X-ray imaging, and non-destructive tests, in many economic sectors. However, such applications come with the risk of harmful radiation, thereby requiring shielding to prevent harmful effects on the surrounding environment and users. Concrete has long been used as pa...

Concrete is a quasi-brittle material whose basic mechanical properties are size-dependent. Due to simple substitution in profoundly congested support structures without experiencing any consolidation, non-segregation property, and smooth finishing, it could be an exceptionally great choice in the concrete industry. The research object is the size e...

Concrete technology is adopted worldwide in construction due to its effectiveness, performance, and price benefits. Subsequently, it needs to be an eco-friendly, sustainable, and energy-efficient material. This is achieved by replacing or adding energy-efficient concrete materials from industries, such as ground granulated blast furnace slag, steel...

The article is devoted to the study of the influence of residual sulfuric and phosphoric acids on the process of processing large-tonnage phosphogypsum (PG) waste into calcium carbonate. In the Russian Federation, about 10 percent of existing phosphogypsum waste is processed into construction materials. Acidic impurities (phosphoric and sulfuric ac...

The construction industry relies heavily on concrete as a building material. The coarse aggregate makes up a substantial portion of the volume of concrete. However, the continued exploitation of granite rock for coarse aggregate results in an increase in the future generations’ demand for natural resources. In this investigation, coconut shell was...

The production and utilization of concrete and concrete-based products have drastically increased with the surge of construction activities over the last decade, especially in countries such as China and India. Consequently, this has resulted in a corresponding increase in the energy used for the production of ready-mixed concrete. One approach to...

Copper-sheathed steel wires combine the conductivity of copper and the traction resistance of steel, which makes a bimetallic wire an ideal material for the construction of power lines. Currently, there is a small number of studies devoted to the change in the microstructure of steel-copper wire during its strain. Since steel and copper have differ...

Currently, a very significant environmental problem is the increase in the accumulation of solid domestic and industrial waste, including the polymer composition. There is a need to involve these wastes in processing, including in the production of building materials. On this way, the issue of reducing the energy intensity of grinding technogenic p...

Demolition of existing deteriorated structures and construction of the new structures is a costly, time-consuming, and resource-intensive process. Repair of concrete beams and strengthening techniques for existing reinforced concrete elements is a resource-saving exercise that is time-saving also. In this work, a repair material using metakaolin-ba...

The load–deformation relationship under the footing is essential for foundation design. Shallow foundations are subjected to changes in hydrological conditions such as rainfall and drought, affecting their saturation level and conditions. The actual load–settlement response for design and reconstructions is determined experimentally, numerically, o...

People need durable shelters for living safely due to devastation caused by flooding in some areas, and it is not easy to mitigate the frequency and intensity of the flooding. Therefore, in this research, an industrialized building system (IBS) has been proposed as one of the best solutions. However, most of the existing IBSs were not designed and...

People need durable shelters for living safely due to devastation caused by flooding in some areas, and it is not easy to mitigate the frequency and intensity of the flooding. Therefore, in this research, an industrialized building system (IBS) has been proposed as one of the best solutions. However, most of the existing IBSs were not designed and...

The production and consequential waste of carbon fiber reinforced polymers (CFRP) is increasing owing to its utilization in various industries like automotive, aviation, electronics, military, sporting goods, etc. Likewise, the production of cementitious composites and related environ- mental concerns are also increasing. Therefore, research instit...

The development of promising concrete mixtures with improved performance is an important scientific problem of modern building materials science. This article presents the effect of mono and polydisperse reinforcement on the rheological properties of concrete mixtures and the physical and mechanical properties of self-compacting concrete (SCC). A c...

A R T I C L E I N F O Keywords: 3D printing Calcium silicate hydrates Modification Mortar A B S T R A C T The trend of concrete science is aimed at reducing the consumption of cement and the use of 3D printing technologies. Based on non-traditional technical silica, 3D printed mortars were designed with a saving of 70% of cement. The binder compone...

Sustainable design methods aim to obtain architectural solutions that assure the coexistence and welfare of human beings, inorganic structures, and living things that constitute ecosystems. The novel coronavirus emergence, inadequate vaccines against the present severe acute respiratory syndrome-coronavirus-(SARS-CoV-2), and increases in microbial...

Concrete is a material that is widely used in the construction market due to its availability and cost, although it is prone to fracture formation. Therefore, there has been a surge in interest in self-healing materials, particularly self-healing capabilities in green and sustainable concrete materials, with a focus on different techniques offered...

The utilization of ordinary Portland cement (OPC) in conventional concretes is synonymous with high carbon emissions. To remedy this, an environmentally friendly concrete, alkaline-activated slag concrete (AASC), where OPC is completely replaced by ground granulated blast-furnace slag (GGBFS) industrial waste, is one of the currently pursued resear...

In recent years, prepacked aggregate fibrous concrete (PAFC) is a new composite that has earned immense popularity and attracted researchers globally. The preparation procedure consists of two steps: the coarse aggregate is initially piled into a mold to create a natural skeleton and then filled with flowable grout. In this instance, the skeleton w...

A predictive model correlating the properties of a catalyst with its performance would be beneficial for the development, from biomass waste, of new, carbon-supported and Earth-abundant metal oxide catalysts. In this work, the effects of copper and iron oxide crystallite size on the performance of the catalysts in reducing nitrogen oxides, in terms...

Vegetable oils have a destructive effect on the strength properties of cement-sand mortar and hardened concrete, even with relatively short-term exposure. The degree of exposure depends on the type of oil, the viscosity of the oil, the quantitative ratio of fatty acids and their position on the triacylglycerin radical, the duration of exposure, and...

The current stage of development of building materials science is characterized by the widespread use of dispersed reinforcement of various compositions and sizes in mortars and concretes. In the paper, priority scientific and technical directions for the rational use of reinforcing fibers, including secondary ones, was established for the effectiv...

For decades, lightweight concrete has been used in various civil engineering applications. Cellular concrete is a type of lighweight concrete that is an emerging composite in materials engineering still. However, due to its low weight, it can be integrated with industrial by-products to develop more advanced composites such as ultra-lightweight cel...

The paper studies the properties of brass workpieces for antifriction rings under severe plastic deformation by high-pressure torsion. The evolution of microstructure and mechanical properties of deformed workpieces after six cycles of deformation by high-pressure torsion at 500 °C have been studied. All metallographic studies were performed using...

This paper presents studies on the possibility of utilization of technogenic waste from the metallurgical industry by the method of complex processing in order to reduce the anthropogenic load on the environment of the region with the example of the zinc silicate-magnetite-carbon system. The selected sample of clinker dump from welting was subjecte...

Lime materials are in great demand for the restoration of the walls of historical buildings. However, lime coatings have insufficient resistance during operation. The purpose of this work was the modification of lime mortars with silicic acid sol in order to obtain more durable crystalline materials for construction purposes. A technology has been...

The development of energy-efficient technologies at all stages of a building's life cycle is essential to achieving sustainable development goals. The object of the study is climate-adaptive façade structures with air gaps in the form of a Trombe wall and a double-skin façade. Cases using phase-change materials (PCM) and photovoltaic modules (PV) i...

Numerical modelling can simulate the interaction between structural elements and the soil continuum in a piled-raft foundation. The present work utilized a two-dimensional finite element Plaxis 2D software to investigate the settlement, swelling, and structural behavior of foundations during the settlement and swelling of soil on various soil profi...