75504 2712-8172 Magazine of Civil Engineering 7 123 2023 1-126
RAR RUS 12301-12301 57219935782 0000-0002-2633-3976 Kazakh Agrotechnical University named after S. Seifullin Mekhtiyev Ali barton.kz@mail.ru
Astana, Republic of Kazakhstan
 57197845922 https://orcid.org/0000-0001-6608-8293 Nosov Magnitogorsk State Technical University Narkevich Mikhail Narkevich_MU@mail.ru
Magnitogorsk, Russia
 57191724446 0000-0002-8973-2958 Karaganda Technical University Neshina Yelena 1_neg@mail.ru
Karaganda, Republic of Kazakhstan
 57216839159 0000-0002-5039-9529 L.N. Gumilyov Eurasian National University Kozhas Aigul kozhas@bk.ru
Astana, Republic of Kazakhstan
 57219937153 0000-0002-4429-953X Kazakhstan Institute of Standardization and Metrology Aimagambetova Raushan rauwan2012@mail.ru
Astana, Republic of Kazakhstan
 0000-0002-7205-6455 North Kazakhstan University named after Manash Kozybayev Aubakirova Bakhytkul aubakirova_68@mail.ru
Petropavlovsk, Republic of Kazakhstan
 56252099900 0000-0002-7209-5024 Kazakh Agrotechnical University named after S. Seifullin Sarsikeyev Yermek sarsikeyev.ermek@yandex.ru
Astana, Republic of Kazakhstan
 Fiber optics based system of monitoring load-bearing building structures Inspection of the technical condition of load-bearing structural elements of buildings and structures in the process of their construction and operation is an important issue at the present time. A fiber-optic monitoring system is proposed as a solution to the problem of early diagnostics of defects and damage to load-bearing building structures. We developed a scheme for testing fiber-optic sensors, which make it possible to control the stress-strain state of monolithic reinforced concrete structures. For testing, a series of monolithic concrete beams of rectangular cross section were reinforced with fiber optics during their manufacturing. The values of mechanical stresses and deformations arising in beams under loading were determined. Using the tested samples as an example, it was established that the proposed fiber-optic monitoring system (FOMS) makes it possible to control stresses and deformations (and to predict the appearance and growth of cracks) in various building structures. The main element of the system is a hardware-software complex capable of estimating the parameters of a light wave at the output of the optical fiber. The distance from the installation site of the data processing unit to the measurement point can cover the area of 30 km. At this, fiber-optic sensors operate without additional power supply from a laser with the power of up to 30 mW. The proposed monitoring system has a low cost of one measurement point, it is easy to install, which is a good alternative to the electronic beacon-recorder device and the development of optical digital technologies in construction. 10.34910/MCE.123.1 681.7:624.012 building and construction mechanical safety information systems signal processing management and systems engineering stress-strain state monolithic reinforced concrete structures buildings and structures defect crack structural failure opt https://engstroy.spbstu.ru/article/2023.123.1/
RAR RUS 12302-12302 Peter the Great Saint Petersburg Polytechnic University Sabri Mohanad Muaya mohanad.m.sabri@gmail.com
Polytechnicheskay, 29
 Department of Civil Engineering, COMSATS University Islamabad Javed Muhammad Faisal arbabfaisal@cuiatd.edu.pk
Islamabad, Pakistan
 Department of Civil Engineering, COMSATS University Islamabad Arslan Muhammad ars918158@gmail.com
Islamabad, Pakistan
 Self-healing concrete utilizing low calcium fly ash, recycled aggregate, and macro synthetic fibers: autogenous behavior and properties This study aims to develop a self-healing concrete solution that addresses the issues of high maintenance and repair costs, limited durability, and reduced service life of concrete structures. To achieve this, low calcium Fly Ash and partially replaced recycled aggregate were utilized, resulting in decreased concrete strength. To counteract this issue, macro synthetic fibers were introduced at 0.5 % and 1 %. The samples were then cracked and left to self-heal over a five-week period. The outcomes indicated that incorporating 60 % Fly Ash was the most effective method of healing cracks within the given timeframe. Moreover, the addition of 0.5 % macro synthetic fibers showed substantial enhancement in mechanical properties without compromising workability. This study highlights the potential of self-healing concrete as a sustainable and cost-effective solution to enhance the performance and durability of concrete structures. 10.34910/MCE.123.2 691.3 self-healing concrete hydrostructures fly ash macro synthetic fibers recycled aggregates https://engstroy.spbstu.ru/article/2023.123.2/
RAR RUS 12303-12303 Admiral Makarov State University of Maritime and Inland Shipping Andreeva Sofiya Cofiaand16@gmail.com
St. Petersburg, Russian Federation
 55101174500 0000-0001-8650-2375 Peter the Great St. Petersburg Polytechnic University Sharapov Dmitry sharapov.dm@gmail.com
St. Petersburg, Russian Federation
 Hoek–Brown model for ice breaking simulation Arctic is an important region for science and economic projects. New infrastructure is required for the sustainable development of this region. The water transport infrastructure in Arctic is subject to extreme environmental impacts. One of the main loads on such structures is the ice load. Conventional way to assess ice loads is to use empirical equations from normative documents. Nowadays with the increasing complexity of designs the numerical calculations became more important. Modern software and material models become more common in design. Ice model is not incorporated in the common engineering software, therefore engineers have to choose among available models. The Hoek–Вrown model of ice is considered as one of the most suitable preinstalled material models in the Plaxis software package. As of today, the authors found no studies proving the applicability of the Hoek–Brown model to the destruction of ice by bending, so this problem is of interest. The Hoek–Вrown model was examined by using available results of the field ice bending tests. The authors compared the ice strength from the numerical calculation and field tests. Young's modulus was estimated with Vaudrey equation. The calculation results from Hoek–Brown model showed the possibility of the model application in general case. The convergence of the results was revealed, with an error that in most cases does not exceed 20 %. Bigger discrepancy for some result points can be explained by the presence of the excessive brine volume in ice. 10.34910/MCE.123.3 626.01 Hoek–Вrown model ice model ice failure ice bending finite-element analysis https://engstroy.spbstu.ru/article/2023.123.3/
RAR RUS 12304-12304 57200983412 0000-0002-7028-7129 Universiti Malaysia Pahang Zaini Muhammad Syamsul Imran syamsulimran94@gmail.com
Pahang, Malaysia
 49361423900 0000-0002-2700-236X Universiti Malaysia Pahang Hasan Muzamir muzamir@ump.edu.my
Pahang, Malaysia
 57190391123 0000-0003-0046-8669 Universiti Malaysia Pahang Masri Khairil Azman khairilazman@ump.edu.my
Pahang, Malaysia
 Stabilization of kaolinitic soil using crushed tile column Kaolinitic soil is a problematic soil that causes poor carrying capacity and excessive settlement, resulting in significant damage to buildings and foundations. Therefore, soil enhancements were introduced to improve the engineering characteristics of the soil. Crushed tiles were taken from the construction area to substitute aggregate or natural sand. Hence, the purpose of the study is to investigate the lateral load capacity of the crushed tile column on the kaolin clay at various column dimensions. Reinforced kaolin clay samples were tested via several laboratory tests, including Particle Size Distribution, Atterberg limits test, Relative Density, Compaction test, Permeability test, Unconfined Compression Test, and Unconsolidated Undrained Triaxial Test with encapsulated crushed tile with geotextile encasement. The authors investigated the effects of column diameter, height, area replacement ratio, height penetration ratio, height to column diameter ratio, volume replacement ratio, and confining pressures on the shear strength of the encapsulated crushed tile columns at a diameter of 6 mm and 8 mm and at a height of 25.33 mm, 38 mm, and 76 mm. The findings showed that using crushed tile columns at various above listed parameters can enhance the soil's shear strength up to 52.00 % at the optimal utilization of a single enveloped crushed tile column with a diameter of 6 mm and height of 76 mm. The crushed tile granular column is practical to be implemented to enhance the strength of the problematic soil. However, the limitation of utilizing this approach is that the crushed tile granular column may not be suitable for deeper soil layers. Hence, the study demonstrated the significant enhancement of the lateral load capacity of soft kaolin clay soil by utilizing crushed tile waste as a granular column. 10.34910/MCE.123.4 539.3 crushed tile granular column lateral load capacity kaolinitic clay ground improvement https://engstroy.spbstu.ru/article/2023.123.4/
RAR RUS 12305-12305 56434340300 0000-0002-5694-1737 Peter the Great St. Petersburg Polytechnic University Usanova Kseniia plml@mail.ru
St. Petersburg, Russia
 7801686579 0000-0001-7011-8213 Peter the Great Saint Petersburg Polytechnic University Barabanschikov Yuri ugb@mail.ru
Polytechnicheskay, 29
 Khalifa University of Science and Technology Dixit Saurav sdixit@ricssbe.edu.in
Abu Dhabi, United Arab Emirates
 Cementless binder consisting of high-calcium fly ash, silica fume and magnesium chloride This work aims to study the effect of MgCl2 additive on the strength, heat of hydration, and phase composition of hydration products of the binder consisting of high-calcium fly ash and silica fume. Fly ash from Berezovskaya thermal power plant, containing a lot of CaOfree, in combination with silica fume does not expand and exhibits the properties of a binder. However, the strength of this binder is low. The MgCl2 additive significantly increases the hardening rate and the final strength of the mix. The compressive strength of 32×32×32 mm specimens from the paste at the age of 7 days is 15.2 MPa and 3.7 MPa with and without the MgCl2 additive, respectively. Exothermic data show that silica fume inhibits CaO hydration from the first minutes of the reaction to 2 days, after which the process accelerates and proceeds evenly. The total value of the thermal effect for 10 days is 500 kJ per 1 kg of binder. The MgCl2 additive does not increase this final value, however, it accelerates the release of heat in the initial periods, excluding the indicated stagnation period. The results of XRD and DTA showed that in the presence of MgCl2, calcium hydrochloraluminate (Friedel's salt) is formed, which was not previously observed in the composition of binder hydration products. 10.34910/MCE.123.5 691.3 fly ash microsilica silica fume early strength agent MgCl2 X-ray diffraction analysis strength heat release differential thermal analysis heat of hydration phase composition https://engstroy.spbstu.ru/article/2023.123.5/
RAR RUS 12306-12306 0000-0001-6118-5238 Eurasian National University named after L.N. Gumilyov Dyussembinov Duman dusembinov@mail.ru
Nur-Sultan, Kazakhstan
 G-2615-2019 35753263300 0000-0002-6487-2428 Damascus University Awwad Talal dr.awwad.gfce@gmail.com
Damascus, Syrian Arab Republic
 L.N. Gumilyov Eurasian National University Sabitov Yerlan e_sabitov@mail.ru
Nur-Sultan, Kazakhstan
 0000-0002-6310-2501 L.N. Gumilyov Eurasian National University Zhumagulova Adiya zaaskarovna@gmail.com
Nur-Sultan, Kazakhstan
 55378440800 0000-0003-1680-5287 Eurasian National University named after L.N. Gumilyov Shakhmov Zhanbolat zhanbolat8624@mail.ru
Nur-Sultan, Kazakhstan
 7218875836 0000-0001-9033-2065 L.N. Gumilyov Eurasian National University Kaliyeva Zhanar zhanna-080477@mail.ru
Astana, Republic of Kazakhstan
 55339733600 0000-0001-8547-5440 Eurasian National University named after L.N. Gumilyov Bazarbayev Daniyar phdd84@mail.ru
Nur-Sultan, Kazakhstan
 Self-compacting concrete with finely dispersed additives and superplasticizer This article investigates the features, qualitative characteristics, and structure of self-compacting concrete (SCC). In particular in this article we present the results of research into the influence of finely dispersed fillers with superplasticizer on physical and mechanical properties of self-compacting concrete. By developing the optimum compositions of different types of concrete, we determined the compressive strength of self-compacting concrete. We proved that plasticizing additive MasterGlenium ACE (Admixture Controlled Energy) significantly liquefies concrete mixture, which allows obtaining self-compacting concrete. The influence of finely dispersed fillers and plasticizers on the density of the concrete mixture was also studied. During the research the effectiveness of the complex application of silica fume (SF) and plasticizer was identified. The results of the research confirm the effect of the amount of fine aggregate and the amount of ACE affecting the workability of the concrete mixture and its strength. 10.34910/MCE.123.6 691.3 self-compacting concrete silica fume compressive strength slump-flow fly ash plasticizing additive https://engstroy.spbstu.ru/article/2023.123.6/
RAR RUS 12307-12307 57202250955 0000-0001-7335-7797 Kazan State University of Architecture and Engineering Ziganshin Arslan ziganshin.arslan@gmail.com
Kazan, Russian Federation
 6602934825 0000-0003-0632-6784 V.G. Shukhov Belgorod State Technological University Logachev Konstantin kilogachev@mail.ru
Belgorod, Russian Federation
 57216545677 0000-0002-9497-349X Kazan State University of Architecture and Engineering Kareeva Julia jkareeva2503@gmail.com
Kazan, Russia
 Vortex zones in an exhaust hood in front of an impermeable plane The paper presents the results of the study of the flow to the ventilation exhaust device in a form of a circular exhaust hood with a flange, located in front of an impermeable plane. Local exhaust devices are the most rational type of localization of harmful substances in industrial and civil buildings. However, they consume a large amount of energy, so the ways to increase their efficiency are relevant and are the subject of numerous studies around the world. One of the promising ways to reduce the aerodynamic drag of such devices is shaping their inlet sharp edges by the outlines of vortex zones. However, when the hood is located above an impermeable plane, the outlines are not known. This study is carried out numerically, so at the first stage the adequacy of the computation model is demonstrated by comparing it with the known data on the resistance of this kind of devices. Furthermore, the dependences for the local drag coefficient are constructed for the flange dimensions in the range d/R = 0.5; 1.5; 2.5; 5 and distances to the impermeable plane in the range s/R = 0.5; 1; 2; 5. The authors found the outlines of both the first vortex zone, formed at flow separating from the sharp edge of the flange, and the second vortex zone, formed at the point of the flange connection to the exhaust channel. The plotted curves showed that the zones sizes are significantly dependent on the distance s/R. The property of geometric similarity for the first vortex zone was found, which will make it possible to construct the first vortex zone using the dependence for the scale factor without numerical simulation. The constructed outlines of the vortex zones will be further used to develop shaped designs of ventilation exhaust hoods. 10.34910/MCE.123.7 697.921: 533.697 local exhaust ventilation exhaust hood vortex zone numerical calculation impermeable plane https://engstroy.spbstu.ru/article/2023.123.7/
RAR RUS 12308-12308 Moscow State University of Civil Engineering (National Research University) Inozemtcev Sergei inozemcevss@mgsu.ru 37099331400 0000-0003-0815-4621 Moscow State University of Civil Engineering (National Research University) Korolev Evgeniy korolev@nocnt.ru
Moscow, Russia
 Moscow State University of Civil Engineering (National Research University) Do Toan Trong trongtoan007@gmail.com
Moscow, Russian Federation
 Intrinsic self-healing potential of asphalt concrete In the work, the influence of temperature, the time of its exposure, as well as the structural properties of bitumen and the test conditions for asphalt concrete on its intrinsic potential for self-healing was studied. Asphalt concrete samples from two types of bitumen with different group compositions were produced and tested under uniaxial compression and split. The intrinsic self-healing potential of asphalt concrete increases with an increase in temperature and exposure time. The greatest effect of temperature on the intrinsic self-healing potential corresponds to values close to the bitumen softening temperature. Temperature is a factor of double action: if there is a sufficient amount of maltene fraction in the bituminous matrix of asphalt concrete, it improves healing; in the absence of the maltene fraction, the high temperature is a condition for the aging of the binder. Aromatic compounds among maltenes are of greater importance in self-healing. The dimensions, condition of the samples, and features of the formation of defects are factors that affect intrinsic self-healing. 10.34910/MCE.123.8 691.16+620.162 self-healing intrinsic potential asphalt concrete bitumen https://engstroy.spbstu.ru/article/2023.123.8/
RAR RUS 12309-12309 57205235403 0000-0001-8332-8607 Civil Engineering Department, University of Baghdad Al Shamaa Mushriq Fuad Kadhim mushriqf@coeng.uobaghdad.edu.iq
Baghdad, Iraq
 Civil Engineering Department, University of Baghdad Al Shimmeri Ahmad Jabbar Hussain dr.ahmadalshimmeri@coeng.uobaghdad.edu.iq
Baghdad, Iraq
 Civil Engineering Department, University of Baghdad Lazem Adnan adnan.lazem@coeng.uobaghdad.edu.iq
Baghdad, Iraq
 Lateral bracing and steel shear wall integration in steel high-rises In high-rise building structures, the designers tend to utilize tube systems, or their combination with other structural frame systems, as an efficient lateral resisting structural system. The drawbacks of tube systems include the effect of shear lag and the architectural problems arising from the closely spaced columns. These drawbacks can be remedied by using exterior braces (concentric bracing system), which provide high shear stiffness in combination with the tubes. Since in high-rise building structures control of bending drift is so difficult and complicated, utlizing the exterior braces is regarded as a practical method due to its high shear and bending stiffenesss. In so doing, in this paper, an innovative concept was investigated in which steel plate shear walls are utilized at the two extreme bays of a frame, and giant exterior braces are used between the shear walls. These two walls act as strong moment arms against the overturning moment and, because of their high stiffness, absorb most of the produced shear; consequently, the shear lag effect diminishes. The obtained results indicate that in the proposed system, the lateral displacement is diminished by around 2.13 times; consequently, the axial forces and bending moments in columns are reduced considerably by about 30 % and 50 %, respectively, demonstrating this system's high effectiveness. 10.34910/MCE.123.9 steel plate shear walls lateral stiffness lateral strength braced frames https://engstroy.spbstu.ru/article/2023.123.9/
RAR RUS 12310-12310 0000-0003-2533-9732 National Research Moscow State Civil Engineering University Samarin Oleg samarin-oleg@mail.ru Temperature mode of a room at integrated regulation of split systems The article considers simplified mathematical formulation and problem solution of internal air temperature changing. The room is equipped with automated local heating and cooling systems under variable thermal influences. At the same time, the study does not pay attention to the influence of the background general exchange system of supply and exhaust mechanical ventilation. It is shown that the main differential equation connecting the most important components of the heat flow in the room for the case under consideration belongs to the class of Emden-Fowler equations. The article provides an analysis of this equation, obtains the structure and variants of its asymptotic solutions. They describe the time dependence of the room air temperature deviation from the setpoint and the expression for the time moment at which the maximum temperature deviation is observed, with an abrupt change in the heat flow and regulation of the equipment of local heating and cooling system according to the integral law. Calculations were carried out to confirm the obtained dependencies using a numerical solution of the original differential equation by the Runge-Kutta method, as well as by comparing them with the results of field measurements in one residential building in Moscow. It is noted that the structure of the analytical solution and the type of dimensionless complexes constructed by reducing the equation to a dimensionless form directly follow from the properties of the Emden-Fowler differential equations. The obtained ratios are proposed to be used for an approximate assessment of the non-stationary thermal regime of an air-conditioned room served by local heating-cooling systems controlled by the integral law. Moreover, these ratios can be used for determination of the necessary characteristics of the regulator, including on the basis of multivariate calculations with a change in the parameters of the problem. 10.34910/MCE.123.10 697.1 : 628.8 microclimate temperature heat balance heat gain regulation integral algorithm transmission coefficient civil engineering building construction industry https://engstroy.spbstu.ru/article/2023.123.10/