11 results on '"Svetlana, Shekhovtsova"'
Search Results
2. Self-Cleaning Cement-Based Building Materials
- Author
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Azariy Lapidus, Evgenii Korolev, Dmitriy Topchiy, Tatyana Kuzmina, Svetlana Shekhovtsova, and Nikolai Shestakov
- Subjects
cement-based materials ,self-cleaning ,photocatalytic process ,gradient ,surface sensitization ,nano-titania ,graphene oxide ,Architecture ,Building and Construction ,Civil and Structural Engineering - Abstract
The modern rhythm of human life leads to well-known problems, which are air, water and soil pollution and climate warming. An increase in the power of industries and vehicles leads not only to atmospheric pollution by-products of incomplete fuel combustion but also to various microscopic particles that form aerosols, which carry an obvious danger to human health and also pollute the buildings’ facades. An environmentally friendly building material with a hybrid method “Nano-titania gradient” was developed. This method consists of forming a gradient of n-TiO2 particles concentration in the composite since the physical properties of the composite are always inextricably linked to the geometry. To increase the efficiency of the photocatalytic process, a method of surface sensitization of titanium dioxide with the use of graphene oxide was proposed, which contributed to an increase in the overall photosensitivity. Thus, the decomposition of nitrogen oxide by volume with the modified surface increased by 27% in comparison with the classic titanium dioxide, and the decomposition of volatile organic substances increased by 32%. It was found that for the facade plate made with surface-sensitized TiO2, the process of self-cleaning is completed after 3 h after the irradiation start. The modern rhythm of human life leads to well-known problems, which are air, water and soil pollution and climate warming. Using the theory of percolation, the concentration range of the photocatalyst content was calculated. To facilitate the material, waste cellulose was introduced. To increase the efficiency of the photocatalytic process, a method of surface sensitization of titanium dioxide (SS TiO2) with the use of graphene oxide was proposed. The analysis of the experimental-statistical models of the compressive strength shows that the optimum content of TiO2 was in the range from 0.8 to 1.1%, and cellulose from 0.4 to 0.8%, the optimum content of SS TiO2 was in the range from 0.7 to 1.1%, and cellulose from 0.4 to 0.8%. Analysis of the experimental and statistical model of the bending strength shows that the optimal content of TiO2 and SS TiO2 was in the range of 0.6 to 1.0%, and cellulose from 0.4 to 0.8%. When studying the structure of composites, it was found that titanium dioxide was sorbed on the surface of swollen cellulose fibers and remained there after the process of cement hydration. The effectiveness of the method of surface sensitization of titanium dioxide by combining it with graphene oxide was shown. Thus, the decomposition of nitrogen oxide by volume with the modified surface increased by 27% in comparison with the classic titanium dioxide, and the decomposition of volatile organic substances increased by 32%. It was found that for the facade plate made with surface-sensitized TiO2, the process of self-cleaning was completed after 3 h after the irradiation start.
- Published
- 2022
3. Comparative Analysis of Rheological Properties and Modification Mechanism of SBS-Graphene Composite Modified Binder
- Author
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Nikun Yang, Evgenii Korolev, Svetlana Shekhovtsova, Jiangmiao Yu, and Huayang Yu
- Subjects
chemistry.chemical_classification ,Materials science ,Graphene ,Composite number ,Polymer ,Nanomaterials ,law.invention ,Rheology ,chemistry ,Asphalt ,law ,Copolymer ,General Earth and Planetary Sciences ,Experimental work ,Composite material ,General Environmental Science - Abstract
SBS (styrene-butadiene-styrene block copolymer) has been widely used in pavement industry as an asphalt modifier. Nanomaterials can further enhance the performance of SBS modified asphalt. However, rare studies investigate the feasibility of using graphene as a performance enhancer of SBS modified asphalt. To fill this gap, comprehensive experimental tests including chemical and mechanical test were carried out on SBS-graphene modified asphalt and SEBS (styrene-ethylene-butylene-styrene block copolymer, which is a hydrogenated polymer of SBS) modified asphalt. Graphene with different dimensions and contents was taken into consideration in this study. Based on the experimental work, it can be concluded that graphene improves the mid-temperature performance of SBS modified asphalt. Compared with two-dimensional graphene, three-dimensional graphene has a greater advantage and the enhancement effect increases with the increase of its dosage. In addition, the cross-linked structure of SBS-graphene composite improves the distribution of SBS in asphalt, which improves the overall performance of SBS modified asphalt.
- Published
- 2020
4. A REVIEW OF THE STATUS OF THE SEGMENT IMPREGNATING MATERIALS FOR COATING ROADS
- Author
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Dmitriy Kuznecov, Evgeniya Vlasova, Marina Vysotskaya, Svetlana Shekhovtsova, and A. Kurlykina
- Subjects
Materials science ,Complementary and alternative medicine ,Coating ,engineering ,Pharmaceutical Science ,Pharmacology (medical) ,engineering.material ,Composite material - Published
- 2018
5. Basis for application of new-generation anti-icing materials as an efficient way to reduce the accident rate on roads in winter
- Author
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Sergey Glagolev, Svetlana Shekhovtsova, and Anastasia Shevtsova
- Subjects
050210 logistics & transportation ,Diagnostic information ,Adverse weather ,Traffic capacity ,05 social sciences ,Variance (land use) ,Poison control ,02 engineering and technology ,Transport engineering ,Braking distance ,020401 chemical engineering ,Safety assurance ,0502 economics and business ,Environmental science ,0204 chemical engineering ,Icing - Abstract
The use of advanced anti-icing materials is important to ensure and maintain the maximum traffic capacity, decrease the accident rate on motor roads exposed to adverse weather conditions in winter. The primary issue in applying these materials deals with ensuring the required traffic safety, therefore, these materials should undergo diagnostics before they can be recommended for use, and, subsequently, the condition of motor roads should be assessed. The diagnostic information obtained allows for comprehensive assessment of road operating conditions representing the most important factor in evaluating road pavement safety, especially in winter. The study addresses the issue of providing the basis for application of anti-icing materials to ensure the required safety on roads in winter. The study is focuses on road pavement operating conditions in winter, and the potential of using the new-generation anti-icing Nordway material and sand-and-salt mixture traditionally used in Russia’s periphery. As a result, due to the use of the new-generation anti-icing material, primary indicators of traffic safety assurance in winter are established. A full-scale experiment using the material under study is performed, primary cohesive properties for the experimental section of the road pavement are determined. Data on the braking distance variance in winter are gathered. A comparative analysis is carried out for a similar data set when using the traditional material, when using the tested material (of new generation) and without applying any materials. The most efficient way to reduce the accident rate on roads in winter using one of the anti-icing materials studied is established.
- Published
- 2018
6. Formation of polymer modified binder structure in the presence of carbon nanomaterials
- Author
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Evgeniy Korolev and Svetlana Shekhovtsova
- Subjects
Polymer modified ,chemistry.chemical_classification ,Materials science ,Scanning electron microscope ,Nanostructured materials ,Delamination ,chemistry.chemical_element ,Building and Construction ,Stickies ,Polymer ,chemistry ,Chemical engineering ,General Materials Science ,Carbon ,Carbon nanomaterials ,Civil and Structural Engineering - Abstract
Polymer modified binder are subject to delamination processes due to the destruction of the structure and are not resistant to thermal-oxidative aging processes. The use of carbon nanomaterials is an effective tool for improving the quality of organic binders. It is possible to form the structure of the material after studying the processes of structure formation and establishing the main control factors. Using the chromatographic method, asphalt-resinous complexes were extracted from polymer nano-modified binders. The peculiarities of structure formation of polymer nano-modified binders are examined using scanning electron microscopy. Asphaltene-resinous complexes were studied using the Matrix Laboratory application programs and computational modules written in the C++ programming language. The hypothesis of asphaltene-resinous complexes as “molecular stickies” has been studied and confirmed. The general physical and mechanical properties of polymer nano-modified binders, their stability during storage and resistance to the thermal-oxidative aging process were studied. The mechanism of the process of structuring polymer modified binders with carbon nanomaterials, which ensures the resistance of binders to destructive processes, such as delamination and aging has been established. It was established that it is the CNMs that increases resistance to destructive processes which increases the resistance against destructive processes and protects the ARC from aggregation and sedimentation.
- Published
- 2021
7. Experimental study of soda lignin powder as an asphalt modifier for a sustainable pavement material
- Author
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Evgeniy Korolev, Svetlana Shekhovtsova, Guocheng Su, Sanjeev Adhikari, Mijash Vaidya, and Jiangmiao Yu
- Subjects
Materials science ,Rut ,0211 other engineering and technologies ,020101 civil engineering ,02 engineering and technology ,Building and Construction ,0201 civil engineering ,chemistry.chemical_compound ,Viscosity ,Cracking ,chemistry ,Rheology ,Asphalt ,021105 building & construction ,Lignin ,Chemical test ,General Materials Science ,Composite material ,Ductility ,Civil and Structural Engineering - Abstract
In recent years, lignin has been receiving more coverage as an asphalt modifier because of its wide variety of sources, low price, renewability, and potential to improve the performance of asphalt pavement. This research aims to develop lignin-modified asphalt by adding soda lignin powder in different proportions to overcome some drawbacks of traditional modified asphalt. A series of tests, including empirical, viscosity, rutting, fatigue, cracking, storage stability, and chemical tests, were performed to determine the influence of soda lignin on asphalt binder. Test results revealed that the addition of lignin helps to reduce the temperature sensitivity of the asphalt by increasing its hardness and decreasing its ductility. At the same time, the incorporation of soda lignin powder also increased the viscosity of base asphalt with the increase in lignin content. Furthermore, rheological performance test results revealed that the addition of soda lignin significantly enhanced the rutting resistance and fatigue performance for all the dosages incorporated. And also, a slight reduction in low-temperature cracking performance was observed. In addition, the storage stability test result depicted that the dispersion of lignin powder in asphalt was comparatively uniform and stable, indicating excellent thermal storage stability for all the lignin amounts incorporated. Moreover, chemical test results suggest that the soda lignin and bitumen can be mixed physically without new chemicals.
- Published
- 2021
8. Road Impregnating Materials, as an Effective Tool for the Protection and Restoration of Asphalt Pavement
- Author
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Svetlana Shekhovtsova, Victoria Vasilyeva, Eugenia Vlasova, and Marina Vysotskaya
- Subjects
Asphalt pavement ,lcsh:TA1-2040 ,021105 building & construction ,0211 other engineering and technologies ,Environmental science ,020101 civil engineering ,02 engineering and technology ,lcsh:Engineering (General). Civil engineering (General) ,Civil engineering ,0201 civil engineering - Abstract
The paper considers the problem of increasing the service life of road asphalt concrete coatings in conditions of year-round operation by road impregnating materials protection from the effects of climatic and operational factors. Objects of research are various domestic road impregnating materials. The subject of research is estimation methodology of road impregnating materials efficiency, modeling effects of the exposed asphalt during operation in the Central Federal District. The article proposes method of estimation of the impregnating materials resistance to different operational factors and consistent scheme of their impact on the object under study is proposed. We conducted comprehensive assessment of road impregnating materials and the effect of their influence on indicators of quality of asphalt concrete and proposed the mechanism of action to protect road impregnating materials.
- Published
- 2021
9. Effect of carbon nanotubes on the properties of pmb and asphalt concrete
- Author
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Svetlana Shekhovtsova and Marina Vysotskaya
- Subjects
Asphalt concrete ,Materials science ,law ,business.industry ,Carbon nanotube ,Composite material ,business ,law.invention - Abstract
In the modern world nanotechnologies are an integral part of successful and progressive development of all the areas of activity. Materials science is not an exception. The authors studied the method of nanomodification and its influence on the performance properties of polymer-modified binder (PMB) and asphalt concrete, produced on their basis. It is established that nanomodified PMB are less susceptible to aging, which is a consequence of the processes of peptization of asphalt-resin complexes (ARC) in the structure of the modified binder and the crosslinking with the polymer matrix. It is revealed that nanotubes (SWCN or MWCN) used as a modifier, act as crosslinking agent and the inhibitor of the aging process in a PMB. The influence of nanomodified PMB on strength and deformation properties of asphalt concrete is investigated. It was found out that the use of modified binder in the asphalt concrete mixtures enhances the water resistance of asphalt concrete, heat resistance and shear-resistance.
- Published
- 2015
10. Development of aggregationally and sedimentationally resistant nanosuspension for efficient polymer modified bitumen
- Author
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Evgeny Korolev, Sergey Inozemtcev, Svetlana Shekhovtsova, and Marina Vysotskaya
- Subjects
Polymer modified ,Materials science ,Chemical engineering ,Asphalt ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,0210 nano-technology ,01 natural sciences ,0104 chemical sciences - Published
- 2018
11. Nanotubes as a modifier pbb and asphalt concrete
- Author
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Marina Vysotskaya and Svetlana Shekhovtsova
- Subjects
Asphalt concrete ,Materials science ,Water resistance ,Polymerization ,business.industry ,Shear resistance ,Heat resistance ,Composite material ,business - Published
- 2015
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