75504 2712-8172 Magazine of Civil Engineering 6 106 2021 1-170
RAR RUS 10601-10601 0000-0003-0413-3946 Federal University of Technology Minna Auta Samuel Mahuta smahuta@yahoo.com
Minna, Nigeria
 Federal University of Technology Minna Jamiu Oladipo oladipojamiuconsult@gmail.com
Minna, Nigeria
 Federal University of Technology Minna Alhaji Bala bala.alhaji@futminna.edu.ng
Minna, Nigeria
 Effect of vertical circular openings on flexural strength of reinforced concrete beam Modern building construction techniques sometimes involve the passing of pipes or ducts for water supply, electrification, and telecommunication through reinforced concrete beams to protect them against mechanical damages and add aesthetic value to buildings. This study looks into the effect of vertical circular openings on the flexural strength of the reinforced concrete beam. Two (2) sets of beam samples were investigated during this study: computer simulated reinforced concrete (RC) beam using ANSYS 19.1 and laboratory cast. The results of the flexural strength test conducted show the following: Reinforced concrete beam with vertical circular openings of diameter greater than 33.3 % of beam width (B) reduced its flexural strength by at least 20 %; maximum compressive stress of concrete occurs at the openings region of the beam; the difference in ultimate load capacity of finite element (FE) beam models and experimental beam specimen is 3.5 %. It can be deduced that ANSYS software is an appropriate finite element (FE) tool to predict the behaviour of RC beams. Hence, it is hereby recommended that the diameter of the vertical circular opening in RC beam should not exceed 33.3 % of the beam width and its location from beam support should not exceed L/6. 10.34910/MCE.106.1 vertical circular openings flexural strength ANSYS building https://engstroy.spbstu.ru/article/2021.106.1/
RAR RUS 10602-10602 ООО "Vibrosejsmozashchita", Dashevskij Mikhail michdash@mail.ru
Moscow, Russia
 0000-0003-4776-5118 National Research Moscow State Civil Engineering University Mitroshin Vasiliy mitroshin.vasiliy@gmail.com
Moscow, Russia
 National Research Moscow State Civil Engineering University Mondrus Vladimir mondrus@mail.ru
Moscow, Russia
 ООО "Vibrosejsmozashchita" Sizov Dmitriy newfff@mail.ru
Moscow, Russia
 Impact of metro induced ground-borne vibration on urban development Metro trains are a source of increased noise and vibration, whose negative impact on residential development and production processes can lead to a deterioration in the quality of life or products. Fluctuations from metro trains spread with a certain frequency, depending on the operating train quantity. The level of recorded fluctuations depends mainly on the geological structure of the site, the depth of the line, and the distance to the observer. Instrumental study of the vibration levels on the ground surface is of practical interest in terms of assessing the impact of vibration on the projected buildings or structures, as well as scientific interest in terms of analyzing the spectrum of RMS values of vibration accelerations for each octave band on the ground surface. A four-channel vibrometer was used to measure the levels of vibrations in the overpass between the Belomorskaya and Khovrino stations on the Zamoskvoretskaya line of the Moscow metro, and then the frequency spectra were analyzed. The conclusion is made that the impact at the rail junction significantly contributes to the overall vibration load when the train enters the station, which is confirmed by a sharp increase in vibration levels at the corresponding observation points. The calculation of the natural vibration forms of the tunnel fragment is performed. Analysis of the measurements showed that a moving train excites vibrations in all octave bands, but the maximum levels of vibration acceleration were registered in octaves 16, 31.5 and 63 Hz. This is consistent with the results of the numerical simulation since the calculated natural vibration frequencies of the tunnel fragment are close to those measured on the ground surface. 10.34910/MCE.106.2 vibration from the subway vibration measurements vibration acceleration https://engstroy.spbstu.ru/article/2021.106.2/
RAR RUS 10603-10603 7005670404 Ivanovo State Polytechnic University Fedosov Sergey fedosov-academic53@mail.ru 0000-0002-2475-3758 Ivanovo State Politechnical University Malichenko Vyacheslav
Ivanovo, Russia
 12645550800 0000-0001-9752-7551 Ivanovo State Politechnical University Toropova Mariya mators@mail.ru
Ivanovo, Russia
 Formation of a software calculation model for restoring building structures after a fire The collapse of building structures after a fire is not uncommon. Taking into account the parameters that affect the elements of the building exposed to extreme temperatures of fire and extinguishing allows assessment of the durability of the entire structure. The analysis of regulatory documents on the survey of buildings and structures after a fire allowed us to establish they lack consideration of such parameters, including the Code of Practice 329.1325800.2017 “Buildings and constructions. Examination rules after a fire”. The decision on the appropriateness of the further operation of buildings after the occurrence of both single and multiple fires is possible based on mathematical modelling of this process, and its software and algorithmic support. The technical objective of the study is to create a universal model for the software calculation of the restoration of structures after fire and fire extinguishing. The object of the study is the fire-related damage and destruction of building structures due to thermal effects. The research method consists in developing a cellular model of a thermally insulated plate based on the localization of the heat source in a certain position above the plate and characterized by the temperature distribution in the cells. The evolution of this distribution is a transition probability matrix that describes the change in thermal conductivity along with the plate in two directions and by the functions of the sources. One of the sources describes the supply of heat to a particular cell (a localized moving source), and the other describes the removal of heat due to heat emission to the environment. As a result of the study, a universal model for the formation of a software calculation for the restoration of structures after fire and fire extinguishing has been developed. The purpose of this model is to establish the residual fire resistance of a building structure after a fire with a minimum calculation time and receive recommendations on the possibility of further operation of the building. 10.34910/MCE.106.3 fire resistance limit fire construction designs bearing capacity fire extinguishing mathematical modeling https://engstroy.spbstu.ru/article/2021.106.3/
RAR RUS 10604-10604 57194427458 0000-0001-7265-583X Department of Civil Engineering, College of Engineering, University of Anbar Hama Sheelan drsheelan@yahoo.com
Ramadi, Iraq
 Department of Civil Engineering, College of Engineering, University of Anbar Suwaid Hashim hashim.2000@yahoo.com
Ramadi, Iraq
 56188851800 0000-0003-3377-2907 Department of Civil Engineering, College of Engineering, University of Anbar Aziz Khalil k_ibraheem@yahoo.com
Ramadi, Iraq
 Behavior of composite steel plate-sustainable concrete slabs under impact loading Concrete has been used as a protective structure to resist impact and blast loads for many years. Recently, researchers have been developing various strengthening methods to increase the impact resistance of concrete. The study includes, first, investigating the basic properties of normal concrete with plastic fibers such as compressive strength and flexural strength, and, secondly, a research of the low-velocity impact resistance of high-performance concrete with steel fiber specimens using a falling mass dropped from the same heights. The impact test used 500×500×60 mm slabs made of plain concrete with different volume fractions of plastic fiber. Test results indicated that incorporating plastic fibers in concrete significantly improves its impact resistance. There is a marginal increase in energy absorption for a change in fiber content from 0.5 to 0.75 %. The authors also considered other parameters besides waste plastic fiber percentages, e.g. degree of interaction (DOI), the method of fixing the stud to a steel plate (welding and epoxy), and the type of structure (composite and non-composite). A theoretical analysis revealed a difference between theoretical and experimental results due to repetitive strikes in the experimental test resulting in accumulated residual deflections. 10.34910/MCE.106.4 composite steel plate-concrete slab degree of interaction deflection impact loading sustainable concrete waste plastic fiber https://engstroy.spbstu.ru/article/2021.106.4/
RAR RUS 10605-10605 L.N. Gumilyov Eurasian National University Sabitov Yerlan e_sabitov@mail.ru
Nur-Sultan, Kazakhstan
 0000-0001-6118-5238 Eurasian National University named after L.N. Gumilyov Dyussembinov Duman dusembinov@mail.ru
Nur-Sultan, Kazakhstan
 0000-0002-6310-2501 L.N. Gumilyov Eurasian National University Zhumagulova Adiya zaaskarovna@gmail.com
Nur-Sultan, Kazakhstan
 55339733600 0000-0001-8547-5440 Eurasian National University named after L.N. Gumilyov Bazarbayev Daniyar phdd84@mail.ru
Nur-Sultan, Kazakhstan
 26031561100 0000-0003-0085-9934 Eurasian National University of L.N.Gumilyov Lukpanov Rauan Rauan_82@mail.ru
Nur-Sultan, Kazakhstan
 Composite non-autoclaved aerated concrete based on an emulsion The proposed composite non-autoclaved aerated concrete based on a polymer emulsion is a solution to several problematic issues in the production of non-autoclaved aerated concrete. Using the method of joint emulsification of aluminium powder and polymer component, we obtained a polymer emulsion that contributes to high-quality saponification of the gas-forming agent. The emulsion ensures uniform gas release over the entire volume of the aerated concrete block, thereby providing a uniform pore structure. To assess the uniformity of the pore structure, we determined the density by sampling three sections of aerated concrete (upper, middle and bottom). We studied the quality of the pore structure by calculating water absorption by weight, compressive strength and freeze/thaw resistance. The results of the water absorption study showed the effectiveness of the polymer emulsion due to the hydrophobicity of the polymer component. The research also revealed the structure of composite aerated concrete cell walls. The obtained results of tests on the strength of composite aerated concrete in comparison with traditional aerated concrete also confirmed the effectiveness of using the polymer emulsion. The analysis of the conducted research contributed to the disclosure of the process that affects the increase in the strength of the material. Research on the freeze/thaw resistance of composite aerated concrete has revealed the mechanism of action of the polymer emulsion in the process of alternate freezing and thawing. In general, the paper demonstrates how polymer emulsion and aluminium powder influence the uniform distribution of pores in the composite structure, and therefore, contribute to the uniform density, low water absorption, high strength and freeze/thaw resistance of composite aerated concrete. 10.34910/MCE.106.5 concretes compressive strength cements mixtures water absorption concrete testing sodium hydroxide https://engstroy.spbstu.ru/article/2021.106.5/
RAR RUS 10606-10606 55876913200 0000-0002-7151-563X V.G. Shukhov Belgorod State Technological University Kurochkina Karina karina200386@yandex.ru
Belgorod, Russia
 0000-0002-1180-558X V.G. Shukhov Belgorod State Technological University Suleimanova Lyudmila ludmilasuleimanova@ya.ru
Belgorod, Russia
 0000-0002-4888-2394 Belgorod National Research University Kolomatsky Alexandr kolomatskiy@yandex.ru
Belgorod, Russia
 Porosity of autoclave aerated concrete and foam concrete: origin of porosity and pore size Porosity in the hardening system consists of air cells, which are the main element of the cellular concrete structure and that formed when gas emission in the mixture or during the foaming. The paper presents the developed models of porous structure formation in autoclaved aerated concrete (AAC) and foam concrete (FC). We elaborated the concept of bubble porosity in fresh concrete by distinguishing three types of bubble pores: microbubble pores, membrane pores and cellular pores. The sizes of such pores are determined and the possibility of pore shape deformation is evaluated. The study revealed that capillary and hydrostatic pressure are the essential factors in the process of bubble system formation. Reducing the size of deformable cellular bubbles and obtaining an increased number of non-deformable membrane bubbles improves the AAC and FC structure. This is a promising method of improving AAC and FC production technology. 10.34910/MCE.106.6 porosity bubble pore size autoclaved aerated concrete foam concrete https://engstroy.spbstu.ru/article/2021.106.6/
RAR RUS 10607-10607 Moscow State Civil Engineering University (National Research University) Obukhova (Shekhovtsova) Svetlana SHehovtsovaSYU@mgsu.ru
Moscow, Russia
 37099331400 0000-0003-0815-4621 Moscow State University of Civil Engineering (National Research University) Korolev Evgeniy korolev@nocnt.ru
Moscow, Russia
 Nanomodified rejuvenators and protective materials for asphalt concrete One of the effective methods to prevent the destruction of asphalt concrete pavement is to treat it with protective and rejuvenator materials. This study is aimed at developing an effective composition of the protective material. The proposed method for studying the effect of modification according to the results of rheological tests allows us to determine the conditional elastic modulus of the structured liquids. The influence of the degree of modification on the content of oil-polymer resins in the bitumen binder was evaluated using the developed quality criterion considering the modifier content contribution. We selected a solvent that provides effective dispersion and stability of the resulting suspension. The studied nanomodifier in the composition rejuvenator material had an impact on the properties of asphalt concrete increasing its crack resistance by 49 %, water resistance by 11 %, and shear adhesion by 6.1 %. 10.34910/MCE.106.7 nanomodification carbon nanofiber protection rejuvenation asphalt concrete https://engstroy.spbstu.ru/article/2021.106.7/
RAR RUS 10608-10608 V.G. Shukhov Belgorod State Technological University Lesovik Valeriy naukavs@mail.ru 0000-0003-2104-6457 Belgorod State Technological University named after V.G. Shukhov Ahmed Anees Alani civileng85@yahoo.com
Belgorod, Russia
 57199850188 0000-0002-2279-1240 Far Eastern Federal University Fediuk Roman roman44@yandex.ru
8. Suhanova St. Vladivostok, st. Octyabrskaya. 690950. Russia
 0000-0002-8564-4272 Belgorod State Technological University named after V.G. Shukhov Kozlenko Bogdan kozlenko@yandex.ru
Belgorod, Russia
 0000-0002-3593-6920 Prince Sattam Bin Abdulaziz University Mugahed Amran Yahya Hussein mugahed_amran@hotmail.com
Alkharj, Saudi Arabia
 0000-0001-7074-9664 Grozny State Oil Technical University named after Academician M.D. Millionshchikov Alaskhanov Arbi alaskhanov.arbi@mail.ru
Grozny, Russia
 0000-0002-8252-3360 Iraq University College (IUC) Asaad Mohammad Ali mohamadalsaad@gmail.com
Basrah, Iraq
 SASTRA to be Demeed University Murali Gunasekaran murali_220984@yahoo.co.in
Tamil Nadu, India
 Belgorod State Technological University named after V.G. Shukhov Uvarov Valery asibstu@mail.ru
Belgorod, Russia
 Performance investigation of demolition wastes-based concrete composites Due to man-made and natural anomalies occurring on planet Earth, there are a lot of destroyed cities, settlements and houses. The issue is how to rebuild these cities and how to use parts of the destroyed buildings and structures in making greener concrete. This paper aims to study the efficiency and effect of using concrete demolition wastes on the microstructure of greener concrete composites. We prepared demolition wastes-based concrete composite containing a greener supplemental cementing binder (GSCB) and fine aggregates of the previously produced concretes with high mechanical properties. The design of the compositions was determined by taking into account the law of affinity of microstructures of greener concretes. We studied the strengths, microstructural, morphological and thermal properties of raw materials and concretes at 28 days of curing. The dense microstructure was examined via the use of Portland cement and hydration products, which partially included previously unreacted clinker minerals presented in concrete waste and activated during its grinding. Results showed that replacing up to 20 % of Portland cement with the demolition waste of concrete structures as a GSCB improves compressive strength for different concrete applications. This is ensured by the affinity of the microstructure of concrete waste and newly synthesized concrete. 10.34910/MCE.106.8 cements cement-based composites binders concretes durability https://engstroy.spbstu.ru/article/2021.106.8/
RAR RUS 10609-10609 Peoples' Friendship University of Russia Tupikova Evgeniya emelian-off@yandex.ru
Moscow, Russia
 Peoples' Friendship University of Russia Rynkovskaya Marina marine_step@mail.ru
Moscow, Russia
 Analytical approach to stress-strain analysis of right and oblique helicoid structures Shell structures with a mid surface of helicoid shape find application in many technical fields, mostly in civil and mechanical engineering. There is a variety of helicoid shells, but the most well-known and used are two types of ruled helicoids: right and oblique. The article is devoted to analytical and numeric-analytical methodologies for shallow right and oblique helicoids. The general approach is based on Kirchhoff–Love linear theory of thin elastic shells. Analytical results can be used for preliminary design and calculations aimed at the understanding of construction physics and regularities of stress-strain state behavior. Two methodologies of stress-strain analysis are presented: the analytical method for shallow right helicoid, and the numeric-analytic method for oblique helicoid (including any special or degenerated case). The numerical results are verified. The results and approach outlined could be of interest to designers and scientists, who want to understand the generalities of thin ruled helicoid shell behavior. 10.34910/MCE.106.9 helicoid structure right helicoid oblique helicoid numeric-analytical solution stress-strain analysis https://engstroy.spbstu.ru/article/2021.106.9/
RAR RUS 10610-10610 57191692642 0000-0002-2321-7195 Institut Teknologi Medan Waruwu Aazokhi azokhiw@gmail.com
Medan, Indonesia
 57193131477 0000-0002-1700-2606 Institut Teknologi Medan Deni Susanti Rika razzanrikadeni@yahoo.com
Medan, Indonesia
 0000-0002-1877-0551 Institut Teknologi Medan Napitupulu Nurtiani napitupulunurtiani@gmail.com
Medan, Indonesia
 0000-0001-6429-0148 Institut Teknologi Medan Oges Sihombing Jaya jayanababan15050@gmail.com
Medan, Indonesia
 The combination of bamboo grid and concrete pile as soil reinforcement under the embankment Material availability and economic price make bamboo a viable option for soil reinforcement. Grids made of split bamboo rods require reinforcement with concrete piles, which are known to have a good bearing capacity under the embankment. The combination of these materials allows reducing the settlement and deflection of the bamboo grid as a subgrade on peat. However, research is needed to get the distance and length of a pile that can provide significant performance in supporting the embankment load. In this research, the pile system with diameters of 2 cm was driven into the peat layer to a certain length and distance. The piles have a length of 15 cm and 25 cm in peat soil layers. The piles were connected monolithically with a bamboo grid using a wire. The pile’s distance was 5–20 cm. The peat soil was compacted layer by layer with a total thickness of 50 cm close to the field density. The embankment load was applied in three stages over one day with pressure of 3.02 kPa at each stage. The reinforcement proved to reduce the settlement and the deflection of the bamboo grid. The results showed that the combination of grid bamboo with concrete piles can be used for reinforcement purposes on peat soils on the following conditions: if L/H = 0.3, the ratio s/d ≤ 2.5; if L/H = 0.5, the ratio s/d ≤ 7.5. 10.34910/MCE.106.10 reinforcement bamboo grid concrete pile design model embankment settlement deflection https://engstroy.spbstu.ru/article/2021.106.10/
RAR RUS 10611-10611 12039592100 0000-0003-4283-0400 South Ural State University Korolev Alexander korolev@sc74.ru
Chelyabinsk, Russia
 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 Layer model of elasticity modulus prediction for lightweight concretes Reducing the structures’ weight is one of the basic approaches to improving the efficiency of construction. There are many developments in this area, especially with lightweight concretes. One of the problems for structural lightweight concrete is a fairly low modulus of elasticity and increased plastic deformations in extreme conditions due to the high porosity of the lightweight aggregates. Therefore, the assessment and prediction of the deformative properties of lightweight concretes is an urgent scientific task on a par with heavy concretes. Our previous work proved the performance of the layer calculation model for heavy concretes. In this research, we attempted to test the layer model when calculating the deformative properties of concretes containinglightweight aggregates. 10.34910/MCE.106.11 light concretes modulus of elasticity/deformation of concrete concrete deformability relative elastic and plastic deformations layer calculation model https://engstroy.spbstu.ru/article/2021.106.11/
RAR RUS 10612-10612 6504446571 0000-0001-6981-7420 Jordan University of Science and Technology Al-Rousan Rajai rzalrousan@just.edu.jo
Irbid, Jordan
 Impact of elevated temperature on the behavior of strengthened RC beams with CFRP Elevated temperatures (beyond 500°C) severely deteriorate concrete structures due to vapor pressure, decomposition of cement hydration products, inhomogeneous volume changes of concrete’s ingredients. Carbon fiber-reinforced polymer (CFRP) composite materials provide the most significant retrieval of the structural performance to severely heat-damaged structural concrete members. Therefore, an experimental study investigated the influence of elevated temperatures on the flexural behavior of reinforced concrete (RC) beams strengthened externally with CFRP. For this purpose, thirty-two reinforced concrete beams were cast. Twenty-four beams were externally strengthened with CFRP, and eight beams were unanchored and left as a control. The beams then were tested under four-point bending to assess their structural performance in terms of failure modes and load-displacement relations. The experimental results have clearly shown that the control beams suffered from ductile failure. The CFRP strengthened beams failed by debonding the CFRP sheets after yielding the flexural steel reinforcement. The strengthened beams showed an increase in the ultimate load-carrying capacity accompanied by an enhancement in mid-span deflection in different percentages concerning the control beam. The CFRP sheets’ ability in the bridging of the crack increased with the increase of CFRP length by providing more development length in catching the two sides of the major flexural crack. The load-deflection curve can be divided into two stages; the first portion is nearly a straight line, and the second stage with slope experienced a slight increase in the load with a large increase in deflection. The second stage formed after the yielding of steel reinforcement and formation of the main flexural crack where the applied load was carried by the CFRP sheet. Finally, the influence of the exposure temperature on the ductility, energy absorption, and ultimate load reduction percentage increases with the increase of temperature. 10.34910/MCE.106.12 reinforced concrete elevated temperature flexural strength fiber reinforced polymer experimental https://engstroy.spbstu.ru/article/2021.106.12/
RAR RUS 10613-10613 Kiselev Vladimir kis_vg@mail.ru 57205523477 0000-0002-2965-357X Peter the Great St. Petersburg Polytechnic University Kalyutik Aleksandr AA_Kalyutik@spbstu.ru
St. Petersburg, Russia
 Corrosive behavior of low-alloy structural steels Increasing the corrosion resistance of low-alloy steels containing less than 2.5% of doping components (except carbon), which are actively used in the construction of various buildings and structures, is one of the priorities in the development of the modern construction industry. This problem becomes especially urgent during operation of stressed elements of various structures, which are used in the conditions of possible surface exposure to moisture. As part of the research, the results of which are presented in this article, we have examined the possible reduction in the rate of electrochemical corrosion of low-alloy steels in a natural corrosive environment. The purpose of the study was to establish the effect of the composition of steels on their corrosive properties. The main method chosen was a method of thermodynamic potentials, used in conjunction with model ideas about ideal gas and free energy of diffusion of liquid, solid and gaseous solutions. The present study analyzes the process of formation of ideal binary alloy, based on which the relationship between the thermodynamic characteristics of its original components and the corrosive behavior of the alloy was established. In order to verify the detected corrosion mechanism, the process of amalgam anode dissolution was considered, which fully confirmed the results obtained earlier.  Based on the analysis conducted, it can be concluded that the equilibrium potential of the ideal binary alloy in the electrolyte in no way depends on the process of its formation from the pure original components. It is determined solely by the ratio of energy characteristics of metal ions actually in the alloy, as well as the energy characteristics of the same ions in the solution of electrolyte, which comes into contact with the alloy. 10.34910/MCE.106.13 construction corrosion of structural materials mechanical safety mechanical properties strength of materials corrosive tests fatigue of materials https://engstroy.spbstu.ru/article/2021.106.13/
RAR RUS 10614-10614 0000-0002-3053-7736 University of Alabama at Birmingham Ramezani Mahyar mramezani@uab.edu
Birmingham, Alabama, USA
Performance of composite connections strengthened with CFRP laminate This paper presents the development of a three-dimensional non-linear finite element model to predict the moment-rotational response of partial depth endplate composite connections. A parametric study is performed to evaluate the influence of utilizing various sizes (i.e., length, width, and thickness) of external Carbon Fiber Reinforced Polymer (CFRP) laminates on the composite connection performance. The numerical analysis reveals that the flexural resistance of the retrofitted CFRP strengthened composite connection increases by up to around 20% and the rotation capacity decreases by approximately 60%. Moreover, the results indicate that applying CFRP laminate to the tension face of the composite slab can reduce the amount of rebar needed for the bending capacity of steel-concrete composite beam-to-column connections. 10.34910/MCE.106.14 finite element method reinforced concrete stiffness bending strength fiber reinforced plastics composite materials retrofitting https://engstroy.spbstu.ru/article/2021.106.14/
RAR RUS 10615-10615 Peter the Great Saint Petersburg Polytechnic University Cherkashin Artemiy jizm@mail.ru
Polytechnicheskay, 29
 57196054199 0000-0002-0840-6828 Peter the Great St. Petersburg Polytechnic University Radaev Anton TW-inc@yandex.ru
St. Petersburg, Russia
 57212393243 0000-0001-9578-7245 Peter the Great St. Petersburg Polytechnic University Olekhnovich Yanis oyanis@list.ru
St. Petersburg, Russia
 Peter the Great St. Petersburg Polytechnic University Sulatskiy Kirill ksulatskiy@mail.ru
St. Petersburg, Russia
 The dependence of the gathering characteristics of nanocarbon cement on the parameters of its production process The article covers issues connected to the justification of the relationship between gathering characteristics of structure-modified materials and parameters of technological processes connected to the materials’ production. On the basis of preliminary analysis of experimental data, the procedure has been proposed for formation of analytical dependence of weight gain values for carbon nanotubes and nanofibres on cement particles (with the use of gas-phase synthesis applied to carbon nanostructures) on time parameters of reduction of iron oxide and synthesis of nanostructures directly on the matrix surface. As a base of the mentioned-above dependence, it has been proposed to use a superposition of two components: the linear component defined by the reduction parameter and a logistic component defined by the synthesis parameter. It has been proposed to use optimization modeling tools for the determination of parameters of analytical dependence. On the basis of the results of the procedure, the conclusion has been made about the adequacy of the obtained results and, as a sequence, high practical importance of the proposed analytical dependence. As part of the further stage of the research, it is planned to carry out laboratory experiments and form the corresponding analytical dependences to assess the effect of synthesis modes on the characteristics of the resulting product for alternative matrix cement materials, such as sulfate-resistant cement, magnesia, slag Portland cement, alumina, pozzolanic. 10.34910/MCE.106.15 building materials carbon nanostructures nanotubes nanofibers nanocement approximation optimization model https://engstroy.spbstu.ru/article/2021.106.15/