Magazine of Civil Engineering

RAR RUS 3-15 S-1676-2017 6507460407 0000-0002-8907-7869 Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Mirsaidov Mirziyod theormir@mail.ru

39, Kori Niyoziy St., Tashkent, Uzbekistan, 100000

Tashkent Institute of Irrigation and Agricultural Mechanization Engineers Toshmatov Elyor Elyortoshmatov@inbox.uz Spatial stress state and dynamic characteristics of earth dams Strength assessment of earth dams is mainly conducted using a plane design scheme, which does not always lead to adequate results. In this paper, it is proposed to assess the stress state of earth dams in a three-dimensional statement. Consequently, to assess the stress-strain state and dynamic characteristics of earth dams, appropriate mathematical models, methods and algorithms are built. The basis of the developed methods for solving specific problems for a spatial structure is a finite element method, the Gauss method (or the square root method) and the Muller method. Reliability of results is proved by solving a series of test problems. With the developed methods, the stress-strain state and dynamic characteristics of the Gissarak and Sokh earth dams were investigated. Based on the results of the study, it has been shown that for some types of earth dams, at preliminary assessment of the stress state and dynamic characteristics of structures, it is possible to use a plane-deformable model of calculation. Studies have shown that to ensure the required accuracy in assessing the stress state and dynamic characteristics of complex inhomogeneous spatial systems (such as earth dams), it is necessary to make calculations using a three-dimensional model. The data obtained as a result of research allowed to reveal some features of the stress state in a spatial case, indicating dangerous areas with the greatest stresses, as well as to study the pattern of natural oscillations that cannot be described using a plane model. 10.18720/MCE.89.1 spatial system three-dimensional (spatial) model inhomogeneity earth dam stress-strain state dynamic characteristic natural frequency modes of oscillations https://engstroy.spbstu.ru/article/2019.89.1/ 01.pdf

RAR RUS 16-25 55941779500 “B.E. Vedeneev VNIIG”, JSC, Orishchuk Roman OrischukRN@vniig.ru Clay-cement-concrete diaphragm — justifying calculation for new-built constructions Due to the observed improvement of machines and mechanisms and the process equipment thereof used during the construction of clay-cement concrete slurry walls by means of bored-secant piles, the author proposes to extend the range of considered designs of impervious elements of embankment dams by adding modifications with an arch diaphragm and an inclined diaphragm. Performed surveys and comparisons with the traditional design (vertical wall) allowed to identify the main trends of the influence of using the effect of clay-cement concrete diaphragms inclination and the arch effect on the change in the strain-stress state of the embankment dam — diaphragm system. Consideration of the clay-cement concrete diaphragm designs proposed by the author in designing embankment dams will allow extending the range of possible application of this technical solution. It was established that there is a possibility to optimize the existing technical solutions for the clay-cement concrete diaphragm embankment dams if they are designed with due consideration of not only the assignment of clay-cement concrete strength and strain-stress properties, but also taking into account the change in configuration of the diaphragm itself. 10.18720/MCE.89.2 embankment dam clay-cement concrete diaphragm bored-secant piles strain-stress state soil/structure interaction numerical modeling cut-of wall strength https://engstroy.spbstu.ru/article/2019.89.2/ 02.pdf

RAR RUS 26-38 Gdańsk University of Technology Abdelgader Hakim hakimsa@poczta.onet.pl 57199850188 0000-0002-2279-1240 Far Eastern Federal University Fediuk Roman roman44@yandex.ru

8. Suhanova St. Vladivostok, st. Octyabrskaya. 690950. Russia

Gdańsk University of Technology Kurpinska Marzena marzena.kurpinska@pg.edu.pl SASTRA to be Demeed University Murali Gunasekaran murali_220984@yahoo.co.in

Tamil Nadu, India

Far Eastern Federal University Baranov Andrey de_montgomery@mail.ru 57194347544 Far Eastern Federal University Timokhin Roman gera210307@yandex.ru

8. Suhanova St. Vladivostok, st. Octyabrskaya. 690950. Russia

6701635056 0000-0002-4393-6728 University of Wolverhampton Khatib Jamal j.m.khatib@wlv.ac.uk

Wolverhampton, United Kingdom

Mechanical properties of two-stage concrete modified by silica fume Two-stage concretes, despite the fact that they have proven themselves in various types of construction, have not been studied to the same extent as traditional heavy concretes. Therefore, the article developed the composition of frame concrete with various additives in the composition of the cement-sand mortar. A comparison of the mechanical characteristics of the developed compositions with the addition of silica fume (SF) and superplasticizer (SP) in various combinations. In addition, test specimens were prepared with combinations of water/cement ratios of 0.45, 0.55, and 0.85, and cement/sand ratios of 0.5, 1, and 1.5. A total of 36 mixtures were prepared, silica fume was introduced as a partial replacement of cement in the amount of 6 wt.%. And a superplasticizer equal to 1.2 % of the cement content was added to the water. Compressive strength tests on two-stage concrete cylinders were carried out in accordance with ASTM-C873 and ASTM-C943. Tensile strength was also tested on 3 samples of each composition in accordance with the procedure described in ASTM-C496/C496M. As a result, the development of the strength of two-stage concrete for 7, 28 and 120 days was studied. It was found that the overall compressive strength of the two-stage concrete based on SF, SP and SF + SP was higher than in concrete without any additives. At the same time, the modified concrete has higher strength properties, because it provides better contact due to expansion, as well as by reducing the water-cement ratio in grout. The results obtained allow to design a cement-sand mortar capable of filling all the voids between the coarse aggregate, thereby creating a dense structure of two-stage concrete. 10.18720/MCE.89.3 two-stage concrete silica fume mechanical properties cement coarse aggregate https://engstroy.spbstu.ru/article/2019.89.3/ 03.pdf

RAR RUS 39-51 56091980300 0000-0003-3850-424X Peter the Great St. Petersburg Polytechnic University Lalin Vladimir vllalin@yandex.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Peter the Great St. Petersburg Polytechnic University Andrey Dmitriev dmitriefan@outlook.com

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Peter the Great Saint Petersburg Polytechnic University Diakov Stanislav stass.f.dyakov@gmail.com

Polytechnicheskay, 29

Nonlinear deformation and stability of geometrically exact elastic arches In the present paper a plane round double-hinged arch under the potential dead load is investigated. To describe the stress-strain state and the equilibrium stability the geometrically exact theory is used. According to this theory every point of the bar has two translational degrees of freedom and one rotational, which is independent from the previous two. To solve the problem no displacements are simplified and all the stiffnesses are used: axial, shear and bending. Exact nonlinear differential equations are found for the static problem. A variational definition for the problem is defined as finding a stationary point of Lagrange functional. The match of the differential and variational formulations is shown. Exact stability equations accounting non-linear geometric deformations in pre-buckling state were worked out. The problem of the equilibrium stability of the round arch under the potential dead load was solved using the obtained equations regarding all the bar’s stiffnesses. The characteristic transcendental equation and its asymptotic solution as simple formulas, suitable for practical application, were worked out. The comparison of described solution which regards all the bar’s stiffnesses and classical solution, based on bending stiffness, was made. 10.18720/MCE.89.4 stability of structures buckling geometrically exact theory dead load round arch stiffness stationary point Lagrange functional https://engstroy.spbstu.ru/article/2019.89.4/ 04.pdf

RAR RUS 52-60 Earth Cryosphere Institute SB RAS Ivanov Konstantin sillicium@bk.ru Optimization of the structure and properties of foam-glass ceramics The basic properties of foam-glass ceramics — a porous inorganic material are optimized in the study. This material is used for thermal insulation of various engineering structures: foundations of buildings, roads and railways, pipelines, etc. The main raw material components of the material are sodium hydroxide and opal-cristobalite rocks: diatomite, tripoli, opoka. The mixture of components is subjected to firing and foams with the formation of a porous structure with vitreous and crystalline phases. A significant impact of two different ways of preparing the batch on the basic properties of the material was studied and analyzed. In the first method, the batch was obtained as a suspension with a high water content, which was subjected to mechanical activation in a vibratory mill. In the second method, the batch was obtained by pushing a mixture of components through calibrated holes with the help of a screw auger. Thus, the batch was an extruded tough-plastic granular mass with lower water content. As a result, the formation of a heterogeneous structure of the samples and the presence of dense non-foamed inclusions, leading to an increased average density of the material were established in the first method. The extruded batch in the second method was foamed more evenly without stratification; thereby the average density of the samples was reduced. An additional reduction in the average density of the samples by 17% due to the intensification of dissolution of silica during the autoclave treatment of extruded batch was observed. The extrusion method is recommended for the production of foam-glass ceramics in granular form, which contributes to the saving of expensive sodium hydroxide. 10.18720/MCE.89.5 building material thermal insulation glass ceramics silicates https://engstroy.spbstu.ru/article/2019.89.5/ 05.pdf

RAR RUS 61-78 57194112309 0000-0001-6184-2365 Vyatka State University Tyukalov Yury yutvgu@mail.ru Finite element model of Reisner’s plates in stresses A method for calculating bending plates by the finite element method based on Reisner's theory is proposed. The method is based on the fundamental principles of minimum of additional energy and possible displacements. For discretization of the subject area, arbitrary quadrangular finite elements are used. Over the area of the finite element, the moment fields and shear forces are approximated by constant functions that satisfy the differential equilibrium equations in the area of the finite element in the absence of a distributed load. Using the principle of possible displacements, algebraic equilibrium equations of the nodes of the finite element grid are compiled. In accordance with Reisner's theory, vertical displacements and angles of rotation of the middle surface of the plate are taken as nodal possible displacements as independent. The proposed method of calculation allows you to calculate both thick and thin plates. There is no effect of «locking» of the solution for thin plates, which is confirmed by calculations of rectangular plates with different support conditions of side and different ratios of thickness to plate sizes. The solutions obtained by the proposed method for plates of various shapes are compared with analytical solutions. Sufficiently fast convergence and accuracy of the proposed calculation method for both thick and thin plates is shown. 10.18720/MCE.89.6 Reisner's plates possible displacements finite elements bending plate https://engstroy.spbstu.ru/article/2019.89.6/ 06.pdf

RAR RUS 79-93 56091980300 0000-0003-3850-424X Peter the Great St. Petersburg Polytechnic University Lalin Vladimir vllalin@yandex.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

56296687300 0000-0002-2299-3096 Peter the Great Saint Petersburg Polytechnic University Rybakov Vladimir fishermanoff@mail.ru

Polytechnicheskay, 29

Peter the Great St. Petersburg Polytechnic University Ivanov Sergey serzikserzik@gmail.com Peter the Great St. Petersburg Polytechnic University Azarov Artur alexio009@mail.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Mixed finite-element method in V.I. Slivker’s semi-shear thin-walled bar theory Mixed variational formulation of static and dynamic problems for thin-walled beams is presented. Stiffness and mass matrixes are derived from the Reissner-like functional. Shear deformation is taken into account by using Slivker’s semi-shear theory of thin-walled bars. Corresponding Euler equations are derived from the proposed mixed functional. Linear Hermite polynomials were considered as approximation for all the internal forces and displacements functions. The exact analytical solutions to some particular eigenfrequency and static problems for thin-walled beam are obtained from mixed formulation. The effect of “spurious” frequencies in thin-walled beam spectrum is discussed. Comparison of the numerical results from the mixed and classical finite element methods is presented. 10.18720/MCE.89.7 mixed finite element method thin-walled beam Slivker’s semi-shear theory Reissner’s functional https://engstroy.spbstu.ru/article/2019.89.7/ 07.pdf

RAR RUS 94-105 57191381045 0000-0002-3021-8591 University of Asia Pacific Miah Md. Jihad jihad.miah@uap-bd.edu

Dhaka, Bangladesh

57202125889 0000-0001-9112-4049 Technische Universität Dresden Miah Mohammad Shamim mmshamim@iubat.edu

Dresden, Germany

University of Asia Pacific Alam Walid Bin walidbin.alam40@gmail.com Politecnico di Milano Lo Monte Francesco francesco.lo@polimi.it Nanyang Technological University Li Ye LIYE0006@e.ntu.edu.sg Strengthening of RC beams by ferrocement made with unconventional concrete Some countries in South Asia has very limited availability of natural stones due to geological features, therefore, most of the concrete buildings of the past are made with burnt clay brick aggregates whose strength is rather low those are more vulnerable to collapse due to any extreme loads. However, ferrocement strengthening has several advantages such as good mechanical performance, cost-effectiveness, locally availability of the materials, and simplicity, this latter making available workmanship able to implement such technique (aspect which is very important in developing countries such as Bangladesh). Hence, the paper deals with the efficacy of ferrocement technique in improving the performance of reinforced concrete beams made in low-strength concrete (beam width 230 mm, height 230 mm, and length 2135 mm). The beams are made with unconventional concrete whose strength is about 12.5–13.0 MPa. The flexural tests are performed experimentally and numerically via the finite element software ABAQUS by considering the following loading configurations: (i) 2 point loads placed at L/3, (ii) 2 point loads are to the support, (iii) 2 point loads close to the mid-span, and (iv) 1 load next to the support and 1 load on the mid-span. The experimental results have shown that unsymmetrical loading decreases the overall load carrying capacity and increases the deformability due to the localization of the damage. The ferrocement beams reinforced by steel wire mesh exhibits high ultimate load carrying capacity and more ductile behavior. The outcome of this research can be used for future modeling and for the development of appropriate design guidelines on the strengthening of concrete structures dealing with different loading conditions. 10.18720/MCE.89.8 unconventional concrete bending shear ferrocement retrofitting deflection https://engstroy.spbstu.ru/article/2019.89.8/ 08.pdf

RAR RUS 106-114 0000-0002-3205-9600 School of Civil Engineering and Architecture, Zhejiang Sci-Tech University Jun Fu fujun@zstu.edu.cn 0000-0001-9015-9848 School of Civil Engineering and Architecture, Zhejiang Sci-Tech University Yue Yu 2206105018@qq.com 0000-0002-6310-7337 School of Civil Engineering and Architecture, Zhejiang Sci-Tech University JiaBin Ye 1640092012@qq.com Water permeation simulation of autoclaved aerated concrete blocks using the Lattice Boltzmann method In this paper, the Lattice Boltzmann Method (LBM) is used to simulate the seepage field of autoclaved aerated concrete blocks. The macroscopic permeability coefficients of aerated blocks are obtained. The complex flow characteristics of the internal flow field are revealed. A stochastic four-parameter growth method (QSGS) based on the distribution probability of initial growth nuclei and porosity is proposed. A meso-model of the real pore structure of aerated blocks is established. The influence of initial inlet pressure and model porosity on the permeability of aerated block is analyzed by numerical calculation of the permeability development process of aerated block. The results show that the two-dimensional meso-model close to the real pore structure of aerated block can be constructed by the stochastic four-parameter growth method; the water permeability coefficient of aerated block calculated by the LBM numerical method is in good agreement with the experimental results; under certain conditions, the linear relationship between the permeability coefficient of autoclaved aerated concrete block and its porosity satisfies the requirement of practical engineering application. It has certain guiding significance for practical engineering application. 10.18720/MCE.89.9 autoclaved aerated concrete block LBM penetration flow simulation MATLAB https://engstroy.spbstu.ru/article/2019.89.9/ 09.pdf

RAR RUS 115-128 56296687300 0000-0002-2299-3096 Peter the Great Saint Petersburg Polytechnic University Rybakov Vladimir fishermanoff@mail.ru

Polytechnicheskay, 29

56091980300 0000-0003-3850-424X Peter the Great St. Petersburg Polytechnic University Lalin Vladimir vllalin@yandex.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Peter the Great St. Petersburg Polytechnic University Ivanov Sergey serzikserzik@gmail.com Peter the Great St. Petersburg Polytechnic University Azarov Artur alexio009@mail.ru

29 Politechnicheskaya St., St. Petersburg, 195251, Russia

Сoordinate functions quadratic approximation in V.I. Slivker's semi-shear stability theory Variational formulation of stability problems for thin-walled beams is presented. Geometrical stiffness matrix is derived from the stability functional. Shear deformation is taken into account by using V.I.Slivker’s semi-shear theory of thin-walled bars. Quadratic Hermite polynomials were considered as approximation for all the internal forces and displacements functions. The exact analytical solutions to some particular eigenfrequency and stability problems for thin-walled beam are obtained. The effect of «spurious» frequencies in thin-walled beam spectrum is discussed. Comparison of the numerical results from the finite element methods is presented. Approximation by quadratic functions turns out to be faster in cases where the buckling has a flexural-torsional form. 10.18720/MCE.89.10 thin-walled bars Slivker’s semi-shear theory stability theory stability functional Hermite polynomial сoordinate functions https://engstroy.spbstu.ru/article/2019.89.10/ 10.pdf

RAR RUS 129-140 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

Moscow State University of Civil Engineering (National Research University) Inozemtcev Sergei inozemcevss@mgsu.ru South China University of Technology Yu Jiangmiao yujm@scut.edu.cn South China University of Technology Yu Huayang huayangyu@scut.edu.cn Method of forecasting the strength and thermal sensitive asphalt concrete A distinctive feature of composites is the manifestation of a synergistic effect due to the interaction of contacting substances at the interphase layer, and their intensity of interaction affects the volume properties of the composites. A study of the interphase layer of bitumen was carried out on the surface of the mineral powder. The proposed method according to the results of rheological tests allows calculating the thickness of the boundary layer in the binary system “asphalt – dispersed phase”. The dependence of the road composite strength on the layer thickness of structured asphalt is established: the strength of the composite increases with increasing thickness of the bitumen layer. Method of assessing the impact on the structural-sensitive properties of the composite extensive factor m – indicator reflecting the influence of the interface area and intensive factor n – indicator reflecting the influence of physicochemical effects at the interface is proposed. The extensive factor has a greater effect on the properties of SMA-20 with a quartz filler m/n > 2. There is a higher rate of decrease in the intensity of physicochemical interactions at the interface of the «oil bitumen-silica filler» phase as compared with the extensive factor. The different nature of the effect of temperature on the extensive and intensive factors is observed for SMA-20 with diatomite: as temperature increases, the factor m increases, whereas the opposite effect is observed for factor n. It indicates a positive effect of the specific surface of diatomite on the temperature properties of asphalt concrete. 10.18720/MCE.89.11 pavement asphalt concret bitumen interphase layer rheology extensive and intensive factors strength thermal sensitive https://engstroy.spbstu.ru/article/2019.89.11/ 11.pdf

RAR RUS 141-155 Voronezh State University of Architecture and Civil Engineering Ikonin Sergey fornag@inbox.ru Voronezh State University of Architecture and Civil Engineering Sukhoterin Andrey asuhoterin@list.ru The effect of design on interaction of foundation slabs with the base The paper suggests advanced trend in reduction of materials consumption for the base slabs owing to their design. As an example, the stress and strain state of the models of solid slabs and slabs with controlled forces interacting with sand base, are addressed in the paper. The models were loaded by static system of concentrated vertical forces. Stress and strain state of the models was assessed by the results of laboratory tray experiments with strain measurement and by the data of numeric calculations by finite element method with application of Coulomb-Mohr soil model. Based on the comparison of obtained results, it is demonstrated that the slab with controlled forces has advantages over a solid slab. For example, owing to the control of forces, it becomes possible to avoid alternation in bending moments diagram, flatten the values of support bending moments for intermediate supports and achieve more smooth deflection of the slab, thus creating prerequisites for significant reduction of materials consumption. Apart from this, it was established that experimental values of bending moments and slab deflection are qualitatively consistent with numerical prediction, while the finite element calculation gives slightly inflated absolute values as compared to the experiment results. The results of the studies may appear useful in the design of base slabs for supports of overhead roads, trestlework along with industrial civil buildings and frame type structures with regular grids of columns. 10.18720/MCE.89.12 experimental studies systems with controlled properties slab foundations hinged beams https://engstroy.spbstu.ru/article/2019.89.12/ 12.pdf

RAR RUS 156-166 57203962119 0000-0001-9723-5161 National Research Moscow State Civil Engineering University Nguyen Trong-Chuc ntchuc.mta198@gmail.com National Research Moscow State Civil Engineering University. Aniskin Nikolay nikolai_aniskin@mail.ru

26 Yaroslavskoye av., Moscow, 129337 Russia

Temperature regime during the construction massive concrete with pipe cooling Pipe cooling is one of the effective measures in order to reduce the exothermic heating of massive concrete structures. In this paper, analyzing the influence parameters of the pipe cooling system on the temperature regime and the thermal stress state in mass concrete to be built. The concrete mass was considered as a pillar with dimensions in plan (10×10) m and a final height of 30.0 m. The effect of the following parameters was investigated: the height of the concrete column from the elevation of the foundation is used for the cooling pipe system; the step of cooling pipe system according to the height and width of the concrete block; the temperature of water supplied to the pipe cooling system. Then, numerical studies were carried out by using the Midas civil software package based on the finite element method in order to solve the temperature problem and determine the thermal stress state of the block. From that will be collected the numerical results from pictures of changes in the temperature regime and the thermally stressed state in mass concrete during construction. The influence of each of those factors is considered in order to evaluate the change in temperature regime and thermal stress of the concrete mass. So, the results obtained are of practical importance and can be used to assign parameters of the pipe cooling system. 10.18720/MCE.89.13 temperature field exothermic heating maximum temperature temperature difference cracking pipe cooling system massive concrete https://engstroy.spbstu.ru/article/2019.89.13/ 13.pdf

RAR RUS 167-178 54938263800 St. Petersburg State University of Architecture and Civil Engineering Lukashevich Anatoliy a.luk@bk.ru

2-nd Krasnoarmeiskaya St. 4, 190005 St. Petersburg, Russia

Modelling of contact interaction of structures with the base under dynamic loading Constructively nonlinear problems with unilateral constraints are frequent in the calculation of various structures. At the same time, certain difficulties cause problems with the contact friction, as well as with the dynamic action of the load. In such cases, the contact problem becomes more complicated in terms of mathematics and its numerical solution becomes more complicated as well. This article is devoted to the construction of calculation models and methods for solving problems with non-ideal unilateral constraints under dynamic loading. As a result, a numerical algorithm has been developed based on the finite element model of contact and the step-by-step analysis method, which allows simultaneous integration of the motion equations and the realization of contact conditions with Coulomb friction. At the same time, to comply with the limitations under the conditions of ultimate friction-sliding, the method of compensating loads is applied. Using the proposed approach, numerical solutions of some problems of contact of a structure with a base have been obtained and analyzed. The reliability of the calculation results is confirmed by comparing them with the solution obtained by the alternative iteration algorithm. It can be concluded that the step-by-step analysis algorithm is more efficient in terms of computation time, showing satisfactory convergence, stability, and accuracy of the solution in a fairly wide range of time integration steps. 10.18720/MCE.89.14 structure base contact interaction unilateral constraints dynamic loading discrete model finite element method https://engstroy.spbstu.ru/article/2019.89.14/ 14.pdf

RAR RUS 179-186 37099331400 0000-0003-0815-4621 Moscow State University of Civil Engineering (National Research University) Korolev Evgeniy korolev@nocnt.ru

Moscow, Russia

National Research Moscow State University of Civil Engineering Duong Thanh Qui quiduongthanh@gmail.com Moscow State Civil Engineering University Inozemtcev Aleksandr InozemcevAS@mgsu.ru Physical and mechanical properties of cement stone with superabsorbent polyacrylate solutions The 3D-technology is becoming widespread in construction. Thus, the development of mixtures with the indifferent set of properties to the influence of the environment is actual. The intensive setting and hardening of cement composites in aggressive conditions require finding solutions to ensure the internal curing of concrete. One of the ways to ensure the internal curing of cement composites can be the using of special superabsorbent polymers (SAP). The formation in the structure of the mixture of thin films of polyacrylate SAP with a delayed polymerization of acrylic acids will provide the reserve of water in the system for hydration. Wherein the mobility of the mixture and strength of composite does not get lost in contrast to the granular SAP. The determination of the influence of the SAP components “Renovir-hydrogel” on the physical and mechanical properties of the cement stone is the main aim of this study. Standard test methods in accordance with Russian state standards for average density and total pore volume, EN 196-1 for kinetics of hardening are used in the work. It has been shown that the super absorbent polymer solutions with a controlled polymerization process can be used in cement composites to control water balance. The investigated SAP solutions allow increasing the average density and compressive strength of cement stone. The admixture of the SAP solutions in the studied range of variable factors leads to an increase in the strength of cement stone by 29.5%. An experimental statistical model describing the dependence of the compressive strength on the amount of catalyst and the ratio of water to polymer part was obtained. This allows for achieving the required characteristics of the composite. 10.18720/MCE.89.15 super-absorbent polymer mechanical properties compressive strength internal curing hardening pore structure shrinkage https://engstroy.spbstu.ru/article/2019.89.15/ 15.pdf