33407 2304-6295 3 117 2025 1-60

RAR RUS 11701-11701 0009-0007-1582-4511 Antoshina Natalia Viktorovna 0009-0005-7260-0376 Ognev Mikhail Nikolaevich 0000-0002-1723-1441 Shamgulov Roman Yurievich 0000-0003-0542-0963 Fomina Ekaterina Viktorovna 0000-0002-3114-7078 Ageeva Marina Sergeevna 0000-0002-4473-9080 Lupandina Natalya Sergeevna W-4457-2017 55863846000 0000-0002-1995-6139 Belgorod State Technological University named after V.G. Shukhov, Belgorod, Russsian Federation Klyuev Sergey Vasilievich klyuyev@yandex.ru

Belgorod, Russsian Federation

The sorption capacity of technical carbon obtained from the thermolysis of tires and mineral wool waste The object of the research is solid municipal waste in the form of carbon black obtained by thermolysis at a temperature of 450° C of automobile tires and finely ground fibrous materials obtained in a vibro-centrifugal unit from waste mineral basalt wool. The purpose of this work is to study the adsorption processes of purification of aqueous solutions, considering the physico-chemical characteristics of adsorbents from man-made raw materials. Method. The results of the physico-chemical properties of carbon black and fibrous material, microstructural, energy dispersion and granulometric analysis are presented. The adsorption processes in aqueous solutions containing heavy metals, dyes, oil and oil have been studied. Results. Adsorption properties with respect to heavy metals of nickel ions Ni2+. for fibrous material, A = 46 mg/g and Cp = 3000 mg/dm3 were calculated, and for carbon black, A = 38.5 mg/g. High adsorption properties of carbon black are observed in aqueous solutions containing the dye methylene blue with a degree of purification up to 98%. It is proved that the process of dye adsorption on carbon particles is of a monomolecular nature. Carbon black has sufficient oil capacity of 13.55 kg/kg of sorbent and oil capacity of 15.33 kg/kg of sorbent. It has been established that the processes of adsorption of petroleum products from aqueous solutions are influenced by the pH of the aqueous medium, temperature, exposure time and dosage of the adsorbent. Optimal indicators of COD have been established. The efficiency of the adsorption process was evaluated by using real wastewater from an existing trucking company. The degree of purification for COD was 93.5%, for suspended solids – 70%, for petroleum products – 85%. 10.4123/CUBS.117.1 69 Municipal solid waste Carbon black Technogenic fibrous waste Car tire thermolysis Mineral wool waste Materials recycling Ecology https://unistroy.spbstu.ru/article/2025.117.1/ 11701.pdf

RAR RUS 11702-11702 Kilbas Sofia Vitalievna G-2929-2018 56227381900 0000-0003-2673-4566 Peter the Great St. Petersburg Polytechnic University Sergeeva (Nemova) Darya Viktorovna darya0690@mail.ru

St. Petersburg, Russian Federation

57190865804 0000-0002-8136-3246 Peter the Great St. Petersburg Polytechnic University Olshevskiy Vyacheslav Ianushevich 79119199526@yandex.ru

St. Petersburg, Russian Federation

15730895100 0000-0003-3251-3356 Saint Petersburg State University of Industrial Technologies and Design Gorshkov Alexander Sergeevich alsgor@yandex.ru

St. Petersburg, Russian Federation

0000-0003-2626-2626 Peter the Great St. Petersburg Polytechnic University Kotov Evgeny Vladimirovich ekotov.cfd@gmail.com

St. Petersburg, Russian Federation

The contribution of solar radiation to the heat balance of a high-rise building in the summer period using the Lakhta Center as an example The object of research is the thermal regime of a high-rise building (the Lakhta Center) equipped with modular double-skin facade structures with buffer zones. Method. A comprehensive approach was used, which included the development of a numerical model of the buffer zone and conducting field observations with the use of an actinometric station for accurate measurement of solar radiation parameters. Results. It was shown that solar radiation has a substantial impact on the building's thermal regime in the summer. The maximum recorded temperature in the buffer zone reached +54°C. The obtained results confirm the significant contribution of solar radiation to the heat and mass transfer processes within the buffer zone of a skyscraper with a transparent facade. ***THE ARTICLE HAS BEEN WITHDRAWN*** 10.4123/CUBS.117.2 69 High-rise buildings Enclosure Structure Heat transfer Convective Facades Double Glazing Buffer Zone Thermal Surpluses Aeration Actinometric Measurement Solar Radiation Energy Efficiency https://unistroy.spbstu.ru/article/2025.117.2/ 11702.pdf

RAR RUS 11703-11703 57190865804 0000-0002-8136-3246 Peter the Great St. Petersburg Polytechnic University Olshevskiy Vyacheslav Ianushevich 79119199526@yandex.ru

St. Petersburg, Russian Federation

Kilbas Sofia Vitalievna G-2929-2018 56227381900 0000-0003-2673-4566 Peter the Great St. Petersburg Polytechnic University Sergeeva (Nemova) Darya Viktorovna darya0690@mail.ru

St. Petersburg, Russian Federation

O-6995-2019 6508103761 0000-0002-1196-8004 Peter the Great St. Petersburg Polytechnic University Vatin Nikolai Ivanovich vatin@mail.ru

St. Petersburg, Russian Federation

Dontsova Anna Evgenyevna 0000-0003-2626-2626 Peter the Great St. Petersburg Polytechnic University Kotov Evgeny Vladimirovich ekotov.cfd@gmail.com

St. Petersburg, Russian Federation

Construction materials using auxetics for building protected structures The object of research is auxetic materials and their application in the creation of structures for protected buildings and facilities. Method. The study is based on a review and analysis of modern research in the field of auxetic metamaterials. The main focus is on evaluating their mechanical properties, particularly their ability to absorb and dissipate energy under various loads and impacts. Results. Promising directions for the use of auxetic materials in the design of protective structures (e.g., impact-resistant elements, protective barriers, seismic protection systems) are described. A novel concept for a brick with an auxetic structure is proposed as a result of the analysis. ***THE ARTICLE HAS BEEN WITHDRAWN*** 10.4123/CUBS.117.3 69 Auxetic Materials Metamaterials Energy Absorption Protective Structures Impact Resistance Seismic Protection Negative Poisson'S Ratio Mechanical Properties Auxetic Brick https://unistroy.spbstu.ru/article/2025.117.3/ 11703.pdf

RAR RUS 11704-11704 0009-0008-4963-3315 Zinevich Pavel Pavlovich ABE-1858-2021 57208300172 0000-0002-8396-4870 Peter the Great St. Petersburg Polytechnic University Kotliarskaia (Vasileva) Irina Leonidovna iravassilek@mail.ru

St. Petersburg, Russian Federation

0009-0009-7146-1668 Antonov Maksim Dmitrievich B-4397-2014 56826013600 0000-0003-1071-427X Peter the Great St. Petersburg Polytechnic University Gravit Marina Viktorovna marina.gravit@mail.ru

St. Petersburg, Russian Federation

0000-0003-4837-5242 Atroshchenko Grigory Nikolaevich 0009-0008-5377-8242 Filonenko Ivan Andreevich 0009-0008-4807-9965 Chugunov Vladimir Alexandrovich Gel-filled structures: The influence of frame size on fire resistance The object of the research is the influence of frame size on fire resistance of gel-filled structures. Method. The research method consisted of determining the time it takes for gel-filled glass unit samples to reach the ultimate limit state (EIW) during a standard fire test in a furnace under standard temperature conditions. Results. The scale factor has a significant impact on the fire resistance of the structure. Square shapes of gel-filled glass units have better fire resistance results compared to rectangular ones. For the tested rectangular glasses, the actual fire resistance limit is EI/EW30 and EI/EW45, while for small-sized glasses and square samples it is EI/EW60. Poor adhesion of the gel to the glass reduces its fire resistance. The use of FT-1 glasses prevents cracks on the unheated surface, which is especially important for large-sized samples. Increasing the gel thickness by 2-4 mm increases the fire resistance limit to 15 minutes. Compliance with technological standards for storage and installation is critically important for achieving the declared fire resistance indicators. 10.4123/CUBS.117.4 69 Translucent structures Glass structures Gel-filled glass units Fire resistance limit Scale factor https://unistroy.spbstu.ru/article/2025.117.4/ 11704.pdf

RAR RUS 11705-11705 0000-0001-5939-3257 Nasimi Shahin 0000-0002-4590-8552 Ehsani Armin Shambina Svetlana Lvovna 0000-0002-7168-5786 Gebre Tesfaldet Hadgembes Influence of carbon nanotubes on the durability and permeability of foam concrete The research object is foam concrete modified with carbon nanotubes (CNTs). The aim is to investigate how CNT incorporation and dispersion affect the material’s permeability and durability, addressing key limitations of conventional lightweight concrete. through adding a range of additives into the mixing process. Foam concrete is one of the types of light concrete that is prepared by mixing sand, cement, water and foam. In general, one of the ways to improve the mechanical properties of concrete is to add a variety of additives to the mixing plan. Method. The mechanical properties are considered for the investigation by adding carbon nanotubes and considering the latest advancements in the field of nanomaterials in the manufacturing of concrete additives and their compatibility with foam and cement types that are accessible in the market. It is hoped that conducting this research will be a start for the next steps in the field of optimizing the production of fiber concrete with high elastic properties. In this project, by using different percentages of carbon nanotubes in the design, favorable results can be obtained. Results. These results show that with the increase in the percentage of carbon nanotubes in foam concrete, the penetration of chlorine ions has decreased by 9.7% compared to the control sample, the depth of water penetration has decreased by 4.8% compared to the control sample, and the water absorption has decreased by 5.5% compared to the control sample. 10.4123/CUBS.117.5 69 Carbon nanotube Lightweight concrete Permeability Durability Foam concrete Nanotechnology https://unistroy.spbstu.ru/article/2025.117.5/ 11705.pdf

RAR RUS 11706-11706 0000-0001-7562-5652 Obeid Mahmoud Abdelsalam Aref mahmoud.obeid@yandex.com 0000-0002-4323-9818 Abu-Mahadi Mohammed Ibrahim abu-makhadi-mi@rudn.ru 0009-0006-3764-1022 Nasrat Nasratullah Abdul Ghafoor nasratullahnasrat609@yahoo.com Effect of different materials and additives on concrete durability The object of research is the durability of concrete in construction, particularly in environments with high sulfate level attack, chloride exposure, or elevated CO₂ reasons. This work aims to examine how specific additives will perform a durability of concrete under these conditions. Experiments assessed concrete samples with varying compositions, focusing on additives that enhance strength and resistance and highlighted the need for specific additives to optimize concrete structure and to mitigate the environmental effects. Method. To evaluate the impact of these materials and additives on concrete's durability and strength, a series of laboratory experiments were conducted. Concrete samples were prepared with varying percentages of the following additives: Plasticizers, Superplasticizers, Air-Entraining Agents, Silica Fume, Fly Ash, Ground Granulated Blast Furnace Slag (GGBFS), Metakaolin, Limestone Powder, Nanomaterials, Zeolites, Polypropylene Fibers, Steel Fibers, Chloride-Resistant Admixtures, Corrosion Inhibitors, High-Performance Concrete (HPC) Admixtures, Activated Fly Ash or Metakaolin, and Bio-based Admixtures. Results. The incorporation of various additives generally enhanced the concrete's strength, with the extent of improvement highly dependent on the additive type and its concentration. While silica fume and GGBFS stood out for their superior performance, other materials like fly ash, nano-additives, and bio-based admixtures also demonstrated significant potential for improving concrete strength under diverse conditions. Overall, this study systematically evaluated 16 concrete additives (SCMs, fibers, chemical/bio-admixtures) through laboratory experiments (w/b = 0.35–0.45) under sulfate/chloride/CO₂ exposures. © The Author(s) 2025 10.4123/CUBS.117.6 69 Concrete Durability Aggressive Environments Additives in Concrete Fly Ash Silica Fume Superplasticizers Ground Granulated Blast Furnace Slag (GGBFS) Metakaolin Sulfate Resistance https://unistroy.spbstu.ru/article/2025.117.6/ 11706.pdf

RAR RUS 11707-11707 0000-0001-7562-5652 Obeid Mahmoud Abdelsalam Aref mahmoud.obeid@yandex.com 0000-0002-4323-9818 Abu-Mahadi Mohammed Ibrahim abu-makhadi-mi@rudn.ru 0009-0006-3764-1022 Nasrat Nasratullah Abdul Ghafoor nasratullahnasrat609@yahoo.com Strength and durability of concrete using quarry dust as a substitute for sand The object of research is quarry dust as a sustainable alternative to natural sand in M40-grade concrete, addressing the environmental and resource challenges caused by sand depletion in Russia. The study examines the effects of replacing fine aggregate with quarry dust (10% to 40%) on concrete's compressive strength, split tensile strength, and durability Method. The concrete mixes were designed following IS 10262-2019 guidelines, with materials hand-mixed and each component precisely weighed. The mix was placed in cubic molds, compacted, and cured in water for 28 days. A total of 45 specimens were prepared and tested for compressive strength and split tensile strength at 7, 14, and 28 days using a universal testing machine C040PN, adhering to IS 516-1959 standards. Results. Replacing up to 20% of fine aggregate with quarry dust enhances compressive strength, achieving a peak strength of 46.35 MPa at 28 days, slightly below the control mix's 47.23 MPa. And up to 20 % enhances tensile strength of concrete achieving a peak strength of 3.95 MPa at 28 days. However, beyond this threshold, performance declines, with strengths dropping to 35.21 MPa at 30% replacement and 34.04 MPa at 40%. making 20% the recommended limit for quarry dust substitution in M40-grade concrete. This approach enables sustainable use of quarry dust without sacrificing the structural qualities essential for construction. 10.4123/CUBS.117.7 69 M40 Concrete Mix Quarry Dust Fine Aggregate Replacement Sustainable Construction Compressive Strength Split tensile strength https://unistroy.spbstu.ru/article/2025.117.7/ 11707.pdf