75504 2712-8172 Magazine of Civil Engineering 2 62 2016 1-112
RAR RUS 3-12 56504969400 0000-0001-8879-1190 Kazan State University of Architecture and Engineering Ibragimov Ruslan rusmag007@yandex.ru
Kazan, Russia
 Kazan State University of Architecture and Engineering Pimenov Sergey 3.14manon@mail.ru
Kazan, Russia
 Influence of mechanochemical activation on the cement hydration features  Nowadays along with the usage of various additives to the concrete mix, the activation of the binder is a promising method to enhance the physical and mechanical properties of the cement concrete. The given paper presents the results of the influence of a mechanochemical activation of cement slurry on the technological properties of the concrete mix and physico-mechanical properties of heavy concrete. The figures of a pore structure of heavy concrete, frost resistance and the coefficient of sulphate cement compositions have been obtained. It is shown that the severe frost resistance of concrete prepared by means of a mechanochemical activation of the binder increases by three times (to the mark F600). This is due to a decrease in the total porosity of 39%, a decrease in capillary porosity of 74.8% and the proportion of closed pores increase by 53% in comparison with the control composition. X-ray diffraction and differential scanning calorimetry investigations have shown that the phase composition of cement paste at the age of 1 day, normal-humidity hardening, obtained by means of a mechanochemical activation of the binder is characterized by a high content of calcium hydroxide (Ca(OH)2) (12 %), high content of ettringite (Ca6Al2(SO4)3(OH)12*26H2O) – 13 %, and the lowest content of the initial phases of Portland cement clinker (16%), which causes high physical and mechanical properties of the resulting composite. The production of cement concrete with a high rate of hardening will reduce the holding time of the concrete in the formwork, to reduce or eliminate the heat treatment, which is relevant in terms of efficient use of energy and resources.  10.5862/MCE.62.1 grinding mechanochemical activation rotary pulsation apparatus superplasticizer cement slurry heavy concrete https://engstroy.spbstu.ru/article/2016.62.1/ 01.pdf
RAR RUS 13-25 57190161363 0000-0002-2328-6238 Ogarev Mordovia State University Nizina Tatyana nizinata@yandex.ru Ogarev Mordovia State University Balykov Artemy artbalrun@yandex.ru Experimental-statistical models of properties of modified fiberreinforced fine-grained concretes The given papers present the results of the investigation of physico-mechanical characteristics of fiber-reinforced fine-grained concretes with polyfunctional modifying additives. The methodology of the construction of experimental-statistical models «modifying additives, dispersible fibers – property» to study density at normal humidity conditions, the limit of compressive strength and the limit of tensile strength in bending cement composites is stated . The graphic reflection of the applied polynomial system for every description was a secondary model from seven triangular Gibbs-Roseboom’s diagrams built with the use of the program Statistica 10.0.1011 and fixed at seven points of a bearing triangle with the isolines of maximums of the investigated properties. According to the results of our experimental study, the most optimal complexes additives and dispersed fibers to increase the investigated characteristics of cement composites have been selected.  10.5862/MCE.62.2 experimental-statistical models; modifying additives; dispersible fibers; fiberreinforced fine-grained concrete; physicomechanical characteristics https://engstroy.spbstu.ru/article/2016.62.2/ 02.pdf
RAR RUS 26-31 Peter the Great St. Petersburg Polytechnic University Taheri Fard Ali Reza alireza_taherifard@yahoo.com
Saint Petersburg, Russia
 Tarbiat Modares University Soheili Hassan hassan7012@gmail.com
Tehran, Iran
 Peter the Great St. Petersburg Polytechnic University Ramzani Movafagh Sara sara.rm84@yahoo.com
Saint Petersburg, Russia
 Amirkabir University of Technology Farnood Ahmadi Pedram p_farnood@yahoo.com
Tehran, Iran
 Combined Effect of Glass Fiber and Polypropylene Fiber on Mechanical Properties of Self-Compacting Concrete Self-compacting concrete is a state-of-the-art technology actively used all over the world in the construction field. This concrete, which has high performance, can be used for casting heavily reinforced sections, in places where vibrators have restricted access for compaction and when complex shapes of formwork are used. Otherwise it may be impossible to cast and the obtained surface is superior to the one achieved with the use of conventional concrete. On the other hand, using various types of fibers can enhance mechanical and dynamical characteristics of concrete as well as reduce cracking in concrete. In this study, we research both combined and individual effects of polypropylene and glass fiber on mechanical and rheological properties of self-compacting concrete. In order to do so, 10 specimens have been made including those containing (A) polypropylene fiber with volume fraction of 0.1, 0.2, 0.3 and glass fiber with volume fraction of 0.1, 0.2, 0.3 and (B) combined polypropylene and glass fiber. The results of these experiments have shown that combined polypropylene and glass fiber can enhance tensile and bending strengths. In addition, these additives dramatically increases toughness of concrete.  10.5862/MCE.62.3 self-consolidating concrete; fibers; mechanical properties; polypropylene https://engstroy.spbstu.ru/article/2016.62.3/ 03.pdf
RAR RUS 32-41 Kazan State University of Architecture and Engineering Gizdatullin Anton antonchiks@mail.ru
Kazan, Russia
 Kazan State University of Architecture and Engineering Khusainov Ravil ravvv_56rus@mail.ru
Kazan, Russia
 Kazan State University of Architecture and Engineering Khozin Vadim borigor83@list.ru
Kazan, Russia
 Kazan State University of Architecture and Engineering Krasinikova Natalia knm0104@mail.ru
Kazan, Russia
 Strength and deformability of concrete structures reinforced with fibre-reinforced polymer bars The given paper presents the results of the research on concrete constructions reinforcing by polymer composite reinforcement (FRP) instead of the steel one functioning on the elastic basis such as road slabs, slabs for chain drives and for pumping machines used at the oil fields. The experimental samples of reinforced FRP products, which are similar to reinforced concrete products due to their geometric parameters, have been manufactured and tested. The comparative assessment of the samples products conformity required in accordance to bearing strength and crack resistance has been also conducted. Based on the obtained results, the recommendations for usage of FRP in prefabricated concrete products have been developed. It was concluded that the usage of FRP for reinforcing process of concrete constructions is reasonable except for the use of several types of overloaded constructions where a significant reduction of an existing gap between the bars and saving the tensile reinforcing area is necessary.   10.5862/MCE.62.4 Glass Fiber Reinforced Polymer (GFRP) bars steel reinforcement strength modulus of elasticity crack resistance prefabricated concrete manufactures https://engstroy.spbstu.ru/article/2016.62.4/ 04.pdf
RAR RUS 42-50 Peter the Great St. Petersburg Polytechnic University Boldyreva Anastasia anastasiaboldyreva96@gmail.com
St.Petersburg, Russia
 Peter the Great Saint Petersburg Polytechnic University Yarunicheva Yuliya julija.jarunicheva@gmail.com
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Dernakova Aleksandra sasha231296@mail.ru
Polytechnicheskay, 29
 Peter the Great St. Petersburg Polytechnic University Ivashov Ilia i.ivashov55@gmail.com
St. Petersburg, Russia
 The strength of the polymer composite (fiberglass) with interlaminar shear  Multilayered fiberglasses are the first practically used fibrous composites. The ultimate interlaminar shear strength is one of the key parameters that is necessary to calculate constructions made of laminated composites. This paper presents the test of multilayer fiberglass exemplars for ultimate interlaminar shear strength carried out by means of the Short Beam Shear test. The research of the influence of the distance between pillars on a value of ultimate interlaminar shear strength is presented. Tests have been conducted using an Instron 596 testing machine with the aid of the equipment for a threepoint bend and a digital USB microscope of DigiMicro 2.0 for tracking and fixation of the moment of emergence in exemplars of the interlaminar shear cracks. The work results in the feasibility assessment of Short Beam Shear test to define ultimate interlaminar shear strength.  10.5862/MCE.62.5 shear; composite; fiberglass; polymer; three-point bending; short beam https://engstroy.spbstu.ru/article/2016.62.5/ 05.pdf
RAR RUS 51-68 Siberian State Automobile And Highway Academy Aleksandrov Anatoliy Aleksandrov00@mail.ru
Omsk, Russia
 Siberian State Automobile And Highway Academy Dolgikh Gennadiy gennadiy1987_87@mail.ru
Omsk, Russia
 Siberian State Automobile And Highway Academy Kalinin Alexsandr a1exsandr55ne@mail.ru
Omsk, Russia
 Improvement of shear strength design of a road structure. Part 2. Modified models to calculate the principal and shear stresses The grounds for road pavements made of granular materials are widely used in the practice of road construction all over the world. Experimental studies of different loads have shown that an adequate stress calculation using the formulas of continuum mechanics is practically impossible. The paper presents the method of modifying stress analysis models, which allows using complementary solutions mechanics of granular medium and engineering methods to calculate the minimum dependencies principal stress 3. Using this method, the modification of a number of solutions has been carried out. The given article provides the modified models. These models allow the calculation of the principal stresses in the half-space and the layer of finite thickness in a section along the axis of symmetry of the load distributed on a circular platform. The comparison of the calculation results with the experimental data performed by the test execution of road construction moving load using a ring stand of the University of Canterbury has been presented. 10.5862/MCE.62.6 principal stress; shear stress; shear strength; soils; discrete materials https://engstroy.spbstu.ru/article/2016.62.6/ 06.pdf
RAR RUS 69-82 Siberian State Automobile And Highway Academy Aleksandrova Nataliy nata26.74@mail.ru
Omsk, Russia
 Siberian State Automobile And Highway Academy Chysow Vasiliy chysow@gmail.com
Omsk, Russia
 The usage of integral equations hereditary theories for calculating changes of measures of the theory of damage when exposed to repeated loads The article gives an overview and analysis of the models of the damage accumulation in monolithic materials when exposed to prolonged and repeatedly applied load. The application of the principle of equivalence stress in the continuous and damage body allowed introducing into the strength criterion of Pisarenko-Lebedev and the three-parameter plasticity condition of Coulomb-Mohr the measures of the theory to accumulate damage in capacity of which the damage of Y.N. Rabotnova and the continuity of L.M. Kachanov are used. It was found that when exposed to repeated load, the process of the reduction of the continuity and the increase in the damage is hereditary. Therefore, to predict changes in these measures under the action of cyclic loads the integral equations of the theory of heredity are applied. This simulation was carried out in two ways. The essence of the first method is that the change of the damage and the continuity in the effects of a repeated stress is determined by the integral equations where the integrand functions are given by means of the degree of dependence. The integration of these functions allowed receiving generalizing logarithmic and exponential models to calculate the reduction of the continuity and the increase in the damage when subjected to cyclic loading. The second way is to apply to the calculation of the damage the principle of equivalence of the deformation or energy where a decrease in the elasticity modulus of the damaged body is described by an integral equation. It was demonstrated that the first method of the calculation of the measures of the theory of the damage accumulation is similar to the principle of equivalence of deformations. There is some brief information about the experimental technique to determine the measures of the theory of the damage accumulation by means of which the parameters of the generalized models for some asphalt concretes are set. The difference of the proposed methods to predict the changes of the damage from analogue is shown. 10.5862/MCE.62.7  damage materials; asphalt pavement; continuity; damage; reload; strength criterion; plasticity condition https://engstroy.spbstu.ru/article/2016.62.7/ 07.pdf
RAR RUS 83-91 Chernysheva Nataliia Peter the Great St. Petersburg Polytechnic University Kolosova Galina gala.kolosova2013@yandex.ru
Saint Petersburg, Russia
Peter the Great St. Petersburg Polytechnic University Rozin Leonid smitu@cef.spbstu.ru
Saint Petersburg, Russia
Combined Method of 3d Analysis for Underground Structures in View of Surrounding Infinite Homogeneous and Inhomogeneous Medium The application of algorithms of the finite element method (FEM) or the boundary element method (BEM) reveals some peculiar properties for a numerical solution of the three-dimensional analysis in infinite domains. Various algorithms offer to avoid such problems at the expense of combining different methods and equations. The algorithm of the 3d analysis developed to solve an external boundary problem by applying the combined method based on incorporating the FEM and Somigliana’s integral formula is considered. The algorithm is modified for the case of the interaction of a structure with an inhomogeneous medium. The efficiency of software implementation of both algorithms has been tested. A stress-strain analysis of an inhomogeneous medium with a cavity has been carried out to illustrate the given approach.  10.5862/MCE.62.8  finite element method threedimensional analysis Somigliana’s integral formula external boundary problem infinite region underground cavities https://engstroy.spbstu.ru/article/2016.62.8/ 08.pdf
RAR RUS 92-101 Peter the Great St. Petersburg Polytechnic University Nazmeeva Tatiana naztv@mail.ru
Saint Petersburg, Russia
 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 Numerical Investigations of Notched C-Profile Compressed Members with Initial Imperfections This article contains the results of numerical investigation of compressed columns made of cold-formed notched C-profile in order to find their ultimate bearing capacity. Numerical investigations of compressed member were held in two stages: investigations of stability in elastic stage in order to define the prevalent form of buckling and the corresponding value of buckling force; investigations of member postcritical behavior in non-linear position with due consideration of physical and geometrical nonlinearity as well as initial imperfections in order to discover the factors influencing bearing capacity. In order to reach the goals of our research a required number of models were made, namely: 28 models of Solid section C-profile (SCP) and 28 models of Notched C-profile (NCP), totally 56 models with the length from 1 000 mm up to 4 000 mm, cross section height h 150 and 200 mm, thickness t 1.5 and 2.0 mm. Numerical investigations were held with the help of software package PLM Femap 10.1 Nastran. Compressed members of solid section C-profile are the most sensitive to initial imperfections, members of notched Cprofile have big postcritical reserve.   10.5862/MCE.62.9 cold-formed notched profile local buckling thin-walled members numerical simulation bearing capacity initial imperfections https://engstroy.spbstu.ru/article/2016.62.9/ 09.pdf
RAR RUS 102-112 Peter the Great St. Petersburg Polytechnic University Bovteev Sergei sergeibovteev@gmail.com
Saint Petersburg, Russia
 Peter the Great St. Petersburg Polytechnic University Kanyukova Svetlana sv.v.kan@mail.ru
Saint Petersburg, Russia
 Development of Methodology for Time Management of Construction Projects This article dwells upon the issues of providing project timely completion as well as key project milestones. In many cases project deadline exceed leads to catastrophic outcomes for the aims and results of the project. Thus, the present article deals with the relevant issues of project schedule control, methodology study based on application of Schedule Timeliness Index and Schedule Progress Index, indicating upon reaching the critical value of extreme deviations from the forecast project duration of targeted project implementation at any moment of time. The suggestion herein is to calculate the minimum possible durations for each project activity and estimate the project duration safety margin coefficient. Based on the safety margin coefficient value it is suggested to define the border values for project shift from one status to another upon criteria of its timely completion possibility. The suggested methodology can be recommended for use by construction project managers in order to prevent a potential failure of project completion deadlines. The system indicating critical project time variance enables to initiate the process of project schedule adjustment before point of no return and herewith prevent project failure. The studied methodology was implemented in modern project management software sphere.  10.5862/MCE.62.10 construction project management project time control project schedule schedule timeliness index schedule progress index project catastrophe https://engstroy.spbstu.ru/article/2016.62.10/ 10.pdf