75504
2712-8172
Magazine of Civil Engineering
6
106
2021
1-170
RAR
RUS
10601-10601
0000-0003-0413-3946
Auta
Samuel Mahuta
Federal University of Technology Minna
smahuta@yahoo.com
Minna, Nigeria
Jamiu
Oladipo
Federal University of Technology Minna
oladipojamiuconsult@gmail.com
Minna, Nigeria
Alhaji
Bala
Federal University of Technology Minna
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
Dashevskij
Mikhail
ООО "Vibrosejsmozashchita",
michdash@mail.ru
Moscow, Russia
0000-0003-4776-5118
Mitroshin
Vasiliy
National Research Moscow State Civil Engineering University
mitroshin.vasiliy@gmail.com
Moscow, Russia
Mondrus
Vladimir
National Research Moscow State Civil Engineering University
mondrus@mail.ru
Moscow, Russia
Sizov
Dmitriy
ООО "Vibrosejsmozashchita"
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
Fedosov
Sergey
Ivanovo State Polytechnic University
fedosov-academic53@mail.ru
0000-0002-2475-3758
Malichenko
Vyacheslav
Ivanovo State Politechnical University
Ivanovo, Russia
12645550800
0000-0001-9752-7551
Toropova
Mariya
Ivanovo State Politechnical University
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
Hama
Sheelan
Department of Civil Engineering, College of Engineering, University of Anbar
drsheelan@yahoo.com
Ramadi, Iraq
Suwaid
Hashim
Department of Civil Engineering, College of Engineering, University of Anbar
hashim.2000@yahoo.com
Ramadi, Iraq
56188851800
0000-0003-3377-2907
Aziz
Khalil
Department of Civil Engineering, College of Engineering, University of Anbar
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
Sabitov
Yerlan
L.N. Gumilyov Eurasian National University
e_sabitov@mail.ru
Nur-Sultan, Kazakhstan
0000-0001-6118-5238
Dyussembinov
Duman
Eurasian National University named after L.N. Gumilyov
dusembinov@mail.ru
Nur-Sultan, Kazakhstan
0000-0002-6310-2501
Zhumagulova
Adiya
L.N. Gumilyov Eurasian National University
zaaskarovna@gmail.com
Nur-Sultan, Kazakhstan
55339733600
0000-0001-8547-5440
Bazarbayev
Daniyar
Eurasian National University named after L.N. Gumilyov
phdd84@mail.ru
Nur-Sultan, Kazakhstan
26031561100
0000-0003-0085-9934
Lukpanov
Rauan
Eurasian National University of L.N.Gumilyov
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
Kurochkina
Karina
V.G. Shukhov Belgorod State Technological University
karina200386@yandex.ru
Belgorod, Russia
0000-0002-1180-558X
Suleimanova
Lyudmila
V.G. Shukhov Belgorod State Technological University
ludmilasuleimanova@ya.ru
Belgorod, Russia
0000-0002-4888-2394
Kolomatsky
Alexandr
Belgorod National Research University
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
Obukhova (Shekhovtsova)
Svetlana
Moscow State Civil Engineering University (National Research University)
SHehovtsovaSYU@mgsu.ru
Moscow, Russia
37099331400
0000-0003-0815-4621
Korolev
Evgeniy
Moscow State University of Civil Engineering (National Research University)
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
Lesovik
Valeriy
V.G. Shukhov Belgorod State Technological University
naukavs@mail.ru
0000-0003-2104-6457
Ahmed
Anees Alani
Belgorod State Technological University named after V.G. Shukhov
civileng85@yahoo.com
Belgorod, Russia
57199850188
0000-0002-2279-1240
Fediuk
Roman
Far Eastern Federal University
roman44@yandex.ru
8. Suhanova St. Vladivostok, st. Octyabrskaya. 690950. Russia
0000-0002-8564-4272
Kozlenko
Bogdan
Belgorod State Technological University named after V.G. Shukhov
kozlenko@yandex.ru
Belgorod, Russia
0000-0002-3593-6920
Mugahed Amran
Yahya Hussein
Prince Sattam Bin Abdulaziz University
mugahed_amran@hotmail.com
Alkharj, Saudi Arabia
0000-0001-7074-9664
Alaskhanov
Arbi
Grozny State Oil Technical University named after Academician M.D. Millionshchikov
alaskhanov.arbi@mail.ru
Grozny, Russia
0000-0002-8252-3360
Asaad
Mohammad Ali
Iraq University College (IUC)
mohamadalsaad@gmail.com
Basrah, Iraq
Murali
Gunasekaran
SASTRA to be Demeed University
murali_220984@yahoo.co.in
Tamil Nadu, India
Uvarov
Valery
Belgorod State Technological University named after V.G. Shukhov
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
Tupikova
Evgeniya
Peoples' Friendship University of Russia
emelian-off@yandex.ru
Moscow, Russia
Rynkovskaya
Marina
Peoples' Friendship University of Russia
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
Waruwu
Aazokhi
Institut Teknologi Medan
azokhiw@gmail.com
Medan, Indonesia
57193131477
0000-0002-1700-2606
Deni Susanti
Rika
Institut Teknologi Medan
razzanrikadeni@yahoo.com
Medan, Indonesia
0000-0002-1877-0551
Napitupulu
Nurtiani
Institut Teknologi Medan
napitupulunurtiani@gmail.com
Medan, Indonesia
0000-0001-6429-0148
Oges Sihombing
Jaya
Institut Teknologi Medan
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
Korolev
Alexander
South Ural State University
korolev@sc74.ru
Chelyabinsk, Russia
M-6585-2013
6508103761
0000-0002-1196-8004
Vatin
Nikolai
Peter the Great Saint Petersburg Polytechnic University
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
Al-Rousan
Rajai
Jordan University of Science and Technology
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
Kalyutik
Aleksandr
Peter the Great St. Petersburg Polytechnic University
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
Ramezani
Mahyar
University of Alabama at Birmingham
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
Cherkashin
Artemiy
Peter the Great Saint Petersburg Polytechnic University
jizm@mail.ru
Polytechnicheskay, 29
57196054199
0000-0002-0840-6828
Radaev
Anton
Peter the Great St. Petersburg Polytechnic University
TW-inc@yandex.ru
St. Petersburg, Russia
57212393243
0000-0001-9578-7245
Olekhnovich
Yanis
Peter the Great St. Petersburg Polytechnic University
oyanis@list.ru
St. Petersburg, Russia
Sulatskiy
Kirill
Peter the Great St. Petersburg Polytechnic University
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/