33407 2304-6295 Construction of Unique Buildings and Structures 5 119 2025 1-60
RAR RUS 11901-11901 0009-0006-3764-1022 Nasrat Nasratullah Abdul Ghafoor nasratullahnasrat609@yahoo.com 0000-0002-4323-9818 Abu-Mahadi Mohammed Ibrahim abu-makhadi-mi@rudn.ru 0000-0001-7562-5652 Obeid Mahmoud Abdelsalam Aref mahmoud.obeid@yandex.com Mechanical and water absorption performance of sheep wool-reinforced compressed stabilized earth bricks The object of research is the evaluation of the mechanical performance and water absorption characteristics of compressed stabilized earth bricks (CSEBs) in considering varying contents of cement and sheep wool fiber (SWF). The experimental work was conducted on bricks produced using locally sourced raw materials in Kabul, Afghanistan. Method. In this study, the bricks were prepared using 28% clay–silt and 72% machine crushed sand as the primary raw materials. Sheep wool fiber (SWF) was incorporated as a reinforcement at contents of 0%, 0.05%, 0.1%, 0.2%, 0.3%, and 0.4% by weight of the soil mix, while ordinary Portland cement (OPC) was used as a stabilizing agent at dosages of 0%, 5%, and 10%. Mechanical performance was evaluated through tests on dry-state and wet-state compressive strength, as well as flexural tensile strength. Dry-state compressive strength was assessed for all mix designs, including combinations with 0% cement and 0% SWF, as well as varying proportions of cement and SWF, to determine the influence of these additives on structural performance. For the wet-state compressive strength test, a constant cement content of 10% was used with varying SWF contents to evaluate the effect of SWF on the retention of compressive strength under saturated conditions. Flexural tensile strength (or modulus of rupture) was assessed across mixtures with 0% cement and 0% SWF, as well as combinations with varying amounts of cement and SWF, to investigate the influence of these components on flexural resistance. For water absorption behavior, total water absorption and capillary water absorption tests were conducted using a constant cement content of 10% and varying SWF contents, to determine the impact of fiber inclusion on the bricks’ water absorption characteristics. Result. The study found that the inclusion of SWF in CSEBs has a negative impact on dry compressive strength, with increasing SWF content leading to a reduction in strength. However, SWF inclusion shows a positive effect in preserving compressive strength under wet conditions and significantly reduces capillary water absorption compared to bricks without SWF. The addition of SWF up to 0.3% improves flexural tensile strength; however, exceeding this dosage leads to a decrease in flexural performance and the development of horizontal cracks in the bricks. Overall, the findings demonstrate that CSEBs incorporating appropriate proportions of cement and SWF show mechanical performance and water absorption characteristics that meet or exceed the requirements of relevant standards. This indicates their capability as sustainable, structurally sound, and load-bearing construction materials suitable for use in a variety of building applications. 10.4123/CUBS.119.1 69 CSEBs Dry compressive strength Wet compressive strength Flexural strength Cement effect Sheep wool effect Water absorption https://unistroy.spbstu.ru/article/2025.119.1/ 11901.pdf
RAR RUS 11902-11902 0000-0003-0088-2990 Alliluyeva Ekaterina Vladislavovna katherine_bio@mail.ru Bahari Abbas 0000-0002-3142-6018 Peter the Great St. Petersburg Polytechnic University Kirsanova Tatiana Aleksandrovna kirsanova_ta@spbstu.ru 0000-0002-2596-0855 Chistyakov Vladimir Anatolyevich vladimirchi@yandex.ru Beskopylny Alexey Nikolaevich 0000-0002-9174-2338 Aramova Olga Yurievna aramova@sfedu.ru Cyber-physical modeling and prediction of self-healing processes dynamics in bioconcrete The object of research is the self-healing concrete, where bacterial activity induces calcite formation to repair microcracks. The study employs cybernetic modeling of bio-concrete, treating bacterial colonies as distributed computing networks that process damage information. Reaction-diffusion equations describe the dynamics of bacterial populations, resource consumption, and crack-healing kinetics. A cyberphysical system integrates sensor data on environmental parameters with a hybrid predictive model combining physico-chemical equations and a neural network to optimize recovery rates. Results demonstrate that feedback modeling and Proportional-Integral-Derivative control principles can potentially enable adaptive regulation of self-healing processes, highlighting the feasibility of smart material design for enhanced durability. 10.4123/CUBS.119.2 69 Self-healing concrete Building materials Self-healing building materials Building materials of the future Self-healing mathematical modeling Regenerative processes in bio-concrete Organic bio-concrete Bioengineering in construction https://unistroy.spbstu.ru/article/2025.119.2/ 11902.pdf
RAR RUS 11903-11903 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
 Iakovlev Nikita Artemovich 0000-0003-2626-2626 Peter the Great St. Petersburg Polytechnic University Kotov Evgeny Vladimirovich ekotov.cfd@gmail.com
St. Petersburg, Russian Federation
 Mishchikhin Sergei Antonovich 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
 Thermal properties of enclosing structures manufactured by additive methods: Analysis of the influence of structural heterogeneity The object of research is samples of enclosing structures created using additive manufacturing. The subject of research is the thermal performance of the samples. Method. A laboratory method was used to test the stability of additive enclosing structures under climatic conditions in St. Petersburg, Russian Federation (Dfb climate). Numerical modeling of heat transfer processes was also used. Results. Additive enclosing structures are classified by geometric characteristics and manufacturing method. The temperature distribution and heat flow in the additive structures were studied in a climatic chamber. Numerical modeling in Ansys Steady-State Thermal showed a high degree of agreement with the experimental results, confirming the adequacy of the selected model and the correctness of the specified boundary conditions. Thermal homogeneity coefficients were calculated for all samples. Sample with configuration 1 is the most thermally homogeneous. The thermal homogeneity coefficient for a structure without filler is 1. The thermal homogeneity coefficient for a structure with filler is 0.95. 10.4123/CUBS.119.3 69 Enclosing structures Additive manufacturing 3D printing Numerical modeling Thermal heterogeneity Climate chamber https://unistroy.spbstu.ru/article/2025.119.3/ 11903.pdf
RAR RUS 11904-11904 Kosykh Alexey Olegovich Ryzhenkova Darya Yurievna Sytik Valeria Sergeevna Yelshaeva Anastasia Mikhailovna Vdovchenkov Evgeny Viktorovich Panchenko Vadim Vladimirovich 0000-0003-0088-2990 Alliluyeva Ekaterina Vladislavovna katherine_bio@mail.ru 0000-0002-9174-2338 Aramova Olga Yurievna aramova@sfedu.ru Kornienko Igor Valerievich ikornienko@yandex.ru Shcheglova Ekaterina Sergeevna Bazhenov Sergey Vladimirovich Berezov Rodion Vyacheslavovich Manukhov Ilya Vladimirovich R-7951-2019 57197681036 0000-0002-7521-5079 University of Zanjan Rahmani Hamid hrahmani@znu.ac.ir
Zanjan, Iran
 Bahari Abbas 0000-0002-2596-0855 Chistyakov Vladimir Anatolyevich vladimirchi@yandex.ru 0000-0002-3142-6018 Peter the Great St. Petersburg Polytechnic University Kirsanova Tatiana Aleksandrovna kirsanova_ta@spbstu.ru Mazanko Maria Sergeevna Prazdnova Evgeniya Valeryevna Dyomin Konstantin Alekseevich Nikora Nadezhda Igorevna Microorganisms from ancient unique structures: physiology, genetics, application prospects Bioconcrete is a material that incorporates specific bacterial species along with several additional components beyond those found in conventional concrete. Due to microbially induced calcium carbonate precipitation (MICP), it has the ability to prevent the propagation of microcracks and to seal them. The bacterial strains employed must remain viable under the harsh conditions of concrete formation, which include high pH, low moisture content, high density, and elevated temperature during curing. It has been hypothesized that bacteria capable of surviving for centuries within ancient construction materials may possess properties advantageous for bioconcrete applications. In this study, viable bacterial spores were isolated from fragments of ancient mortar collected from the ruins of the ancient city of Chersonesus Taurica. This site, a unique monument of Greek architecture that existed until the 15th century AD, is located in the area of modern Sevastopol (Russia). The isolated strains were evaluated for their ability to grow at pH 10, to produce urease, to precipitate calcium carbonate, and to withstand the concrete processing cycle. Genomic sequencing was performed for three selected promising alkalophilic strains. One of them was identified as a potential representative of a previously undescribed species, Sutcliffiella sp., while the other two were identified as Cytobacillus horneckiae (all belonging to the family Bacillaceae). Genomic analysis revealed a set of genes associated with carbonate ion production and resistance to alkaline environments. ***ARTICLE IN PRESS*** 10.4123/CUBS.119.4 69 Ancient building mortars Tauric Chersonesos Bacteria Urease Self-healing of concrete Calcium carbonate Genomic analysis https://unistroy.spbstu.ru/article/2025.119.4/ 11904.pdf
REV RUS 11905-11905 0000-0002-7422-5494 Peter the Great St.Petersburg Polytechnic University Vafaeva Khristina Maksudovna vafaeva_hm@spbstu.ru
Saint 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
 Karpov Denis Fedorovich Voronov Alexander Sergeyevich Hybrid glass-basalt fiber reinforced polymer pipes for prefabricated construction in temperate and arctic environments: A review The object of research is prefabricated building structures and the potential application of hybrid glass-basalt fiber-reinforced polymer (HGBFRP) composite pipes as an alternative material for prefabricated structural elements in temperate and Arctic environments. The study focuses on the mechanical performance, durability, behavior under extreme temperatures and suitability of HGBFRP pipes for integration into prefabrication technologies. Method. A comprehensive review and analysis of existing research on HGBFRP pipes was conducted, emphasizing their mechanical properties, corrosion resistance, strength-to-weight ratio, and performance across diverse climatic conditions. The review also examined how HGBFRP pipes work with prefabrication methods and looked at advances in manufacturing technologies to assess their potential for cost-effective production and widespread adoption. Results show that HGBFRP pipes have high mechanical performance, excellent durability, and reliable behavior under extreme temperatures, making them a promising material for precast construction. Their compatibility with prefabrication methods suggests potential for more efficient and sustainable construction practices. The combination of strength, durability, and performance in harsh conditions highlights their suitability for Arctic and temperate climates. Future research will focus on evaluating long-term performance in natural conditions and exploring innovative applications in the construction industry. 10.4123/CUBS.119.5 69 Prefabricated construction HGBFRP pipes Hybrid composites Mechanical properties Durability Arctic environments Corrosion resistance Sustainability Extreme temperatures Material compatibility https://unistroy.spbstu.ru/article/2025.119.5/ 11905.pdf
RAR RUS 11906-11906 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
 Ulanov Aleksandr Vadimovich 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
 G-1611-2018 56352359500 0000-0002-5156-7352 Volgograd State Technical University Korniyenko Sergey Valeryevich svkorn2009@yandex.ru
Volgograd, Russian Federation
 Moisture accumulation in the assembly joint of the window block abutment to the wall opening The object of research is a typical assembly joint of the window block junction with the wall opening. Method. The moisture regime of the typical assembly joint is calculated in a similar manner as for the enclosing structures. The study used the method of determining the maximum wetting plane; the graph-analytical method; an approximate analytical method for determining the position of the plane of possible condensation; an assessment of annual moisture accumulation and a test for compliance with the Rogers principle. Results. The calculation of the typical assembly joint using the maximum wetting plane revealed limitations in the tabular data. The analysis of the studies also revealed a high error in the formula for determining the partial pressure of saturated vapor at sub-zero temperatures. The approximate analytical method for determining the position of the plane of possible condensation also revealed limitations of the tabular data. The graph-analytical method did not reveal any intersection of the curves  and  at a temperature of -6.5 °C (the average January temperature), which indicates the absence of condensation at higher temperatures. An assessment of annual moisture accumulation showed that no moisture accumulation occurs throughout the year. The calculation identified a plane of maximum condensation at the outer boundary of the assembly joint. A rapid inspection using Rogers' principle confirmed the correct execution of the assembly joint. The identified deficiencies in the methods indicate the need for additional research to assess the moisture conditions of assembly joints, as the methods used form the basis of current regulatory documents. 10.4123/CUBS.119.6 69 Assembly Joint Vapor Permeability Vapor Permeability Resistance Moisture Moisture Calculation Moisture Accumulation Condensation Maximum Wetting Plane Maximum Wetting Temperature https://unistroy.spbstu.ru/article/2025.119.6/ 11906.pdf
RAR RUS 11907-11907 Iakovlev Nikita Artemovich 0000-0003-2626-2626 Peter the Great St. Petersburg Polytechnic University Kotov Evgeny Vladimirovich ekotov.cfd@gmail.com
St. Petersburg, Russian Federation
 Mishchikhin Sergei Antonovich 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
 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
 Thermal irregularity of connection joints in modular enclosing structures The object of research is the thermal irregularity (non-uniformity) of connection joints in modular enclosing structures. The purpose of this work is a comprehensive study of the thermal properties of enclosing structures of modular buildings. Method. The study combines full-scale temperature measurements on a modular corner fragment with three-dimensional finite element thermal modeling. Numerical modeling of two typical configurations of corner joints was also carried out: with hollow square sections and with I-beams. Results. The analysis of heat losses at the junctions of structural elements was conducted. The validated model reproduces the experimentally observed temperature distribution, confirming its suitability for analyzing thermal irregularities. The strongest cooling and highest heat flux occur in the wall-floor corner zone due to geometric and material discontinuities. Comparative assessment of joint configurations shows that hollow square profiles exhibit lower specific heat losses (0.008 W/°C) than I-beam joints (0.011 W/°C), indicating their higher thermal efficiency. 10.4123/CUBS.119.7 69 Modular enclosing structures Modular buildings Thermal irregularity Thermal bridges Heat flux Modular joints Finite element method Heat loss https://unistroy.spbstu.ru/article/2025.119.7/ 11907.pdf