75504 2712-8172 Magazine of Civil Engineering 7 51 2014 1-111
CHR RUS 3-4 Peter the Great Saint Petersburg Polytechnic University Yakubson Vera engstroy@inbox.ru
Polytechnicheskay, 29
 "Inspection of buildings and structures: problems and solutions" – conference resume On October, 17th, in St-Petersburg Polytechnic University the fifth, anniversary scientific and technical conference "Inspection of buildings and structures: problems and solutions" took place. This year the event became international: there were researchers and experts from Poland, Finland, Latvia, Ukraine, Sweden, Hungaria in the program commitee and among the participants. 10.5862/MCE.51.11 conference inspection of buildings structure testing wooden structures glass structures piles biological corrosion https://engstroy.spbstu.ru/article/2014.51.1/ 01.pdf
RAR RUS 5-15 Peter the Great St. Petersburg Polytechnic University Ivashov Ilia i.ivashov55@gmail.com
St. Petersburg, Russia
 Dresden University of Technology Semenov Artem Semenov.Artem@googlemail.com Influence of crack face boundary conditions on the fracture of polycrystalline piezoelectric ceramics Today structural health monitoring is a widely developing field that enables real-time damage detection of engineering structures and elements. Monitoring is carried out using a set of sensors, most of which contain piezoelectric materials. So far the problem of crack resistance and lifetime estimation for polycrystalline piezoelectric materials has not been fully solved. The paper considers fundamentals of linear fracture electromechanics, fracture parameters and fracture criteria. The main difference from linear fracture mechanics is the need for taking into account relative permeability of media inside the crack gap and crack face Coulomb interaction . Different types of crack face boundary conditions and their numerical implementation were described. The paper presents the results of finite element modeling of the fracture toughness experiments conducted on the compact tension specimens under combined electromechanical loading. Different types of crack face boundary conditions and their influence on fracture toughness were analyzed and different fracture criteria were compared to the experimental data. 10.5862/MCE.51.1 piezoelectricity crack fracture https://engstroy.spbstu.ru/article/2014.51.2/ 02.pdf
RAR RUS 16-22 6701823730 0000-0003-0564-3307 Peoples' Friendship University of Russia Svintsov Alexandr svintsovap@rambler.ru Peoples' Friendship University of Russia Nikolenko Yuriy yvnikolenko39@gmail.com Kharun Makhmud miharun@mail.ru Peoples' Friendship University of Russia Kazakov Aleksandr alexandre.kazakov@renault.com Effect of viscosity of petroleum products on deformation properties of concrete This paper presents the results of studies of the effect of petroleum products, impregnating in concrete, on its deformation properties. Petroleum products, impregnating in concrete and reinforced concrete structures, have a negative impact on their strength and deformation characteristics. The negative impact of petroleum products on concrete and reinforced concrete is associated with changes in the hydration process of cement, as well as changes in the structure of the concrete. Strength and deformation characteristics of concrete change due to hydraulic pressure of petroleum products in the pores exerted on the skeleton of cement stone. In this aspect, the crucial point is the porosity of concrete as a permeability factor for petroleum products. One of the most important factors affecting the physical and mechanical characteristics of oilimpregnated concrete is their viscosity. In this paper, the mathematical description of the change of deformation depending on the relative viscosity of impregnating of petroleum products, the value of the axial load and the concrete class was proposed. The obtained results allow assessing changes in deformation characteristics of load-bearing concrete and reinforced concrete of industrial buildings, where petroleum products are used in the technological processes. 10.5862/MCE.51.2 concrete deformation petroleum products viscosity stress cement stone https://engstroy.spbstu.ru/article/2014.51.3/ 03.pdf
RAR RUS 23-30 7801686579 0000-0001-7011-8213 Peter the Great Saint Petersburg Polytechnic University Barabanschikov Yuri ugb@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Arkharova Anna arxarova93@bk.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Ternovskii Maksimilian maxter93@mail.ru
Polytechnicheskay, 29
 On the influence on the efficiency of anti-shrinkage additives superplasticizer Cement paste shrinkage and influence of the shrink-resistant additive Estrifan Additive RCL on this process were studied, both when the latter one was used independently, and in a combination with the superplasticizer Muraplast FK48, and powdery fillers - fly ash and silica fume Reftinskaya TPP ISU-85. It has been revealed that cement shrinkage in the presence of this additive is reduced regardless of the presence or absence of mineral microfillers. Moreover, these fillers have no impact on shrinkage. When the content of additives is more than 2% at the initial stage of hardening expansion was observed. The expansion period is getting longer, and the expansion deformation value is becoming higher with the increased dosage of the additive. Presence of the superplasticizer FK48 strengthens the effect of the initial expansion caused by the RCL additive, and also reduces shrinkable deformation in spite of the fact that this additive increases shrinkage of a cement stone when used independently. It has been established that the expansion is caused by the additive influencing the chemical processes of hydration, allegedly influencing the growth of crystals calcium gidrosulfoalyuminat. The expansion partially or completely compensates shrinkage which develops generally due to removal of moisture. The superplasticizer FK 48 slows down water evaporation and, thereby, increases efficiency of the RCL additive action. However, under the equal condition of moisture losses, the ability of the FK48 additive to slow down water evaporation loses its value and action of this additive is negative. 10.5862/MCE.51.3 cement stone air shrinkage autogenous shrinkage expansion additives fillers synergy strength https://engstroy.spbstu.ru/article/2014.51.4/ 04.pdf
RAR RUS 31-37 Moscow State Civil Engineering University Inozemtcev Aleksandr InozemcevAS@mgsu.ru Average density and porosity of high-strength lightweight concrete The analysis results of high-strength lightweight concrete (HSLWC) structure are presented in this paper. The X-ray tomography, optical microscopy and other methods are used for researching of average density and porosity. It has been revealed that mixtures of HSLWC with density 1300…1500 kg/m3 have a homogeneous structure. The developed concrete has a uniform distribution of the hollow filler and a uniform layer of cement-mineral matrix. The highly saturated gas phase which is divided by denser large particles of quartz sand and products of cement hydration in the contact area allow forming a composite material with low average density, big porosity (up to 40%) and high strength (compressive strength is more than 40 MPa). Special modifiers increase adhesion, compacts structure in the contact area, decrease water absorption of high-strength lightweight concrete (up to 1 %) and ensure its high water resistance (water resistance coefficient is more than 0.95). 10.5862/MCE.51.4 high-strength lightweight concrete hollow microspheres nanotechnology microstructure average density porosity https://engstroy.spbstu.ru/article/2014.51.5/ 05.pdf
RAR RUS 38-45 Kazakh National Technical University named after K.I. Satpayev Zuginisov Maratbek maratbek51@mail.ru Kazakh National Technical University named after K.I. Satpayev Myrzahmetov Menlibay myrzahmetov@mail.ru Kazakh National Technical University named after K.I. Satpayev Sartayev Daulet sartayev_d@mail.ru Kazakh National Technical University named after K.I. Satpayev Orynbekov Yelzhan eljan_79@mail.ru Heat-resistant ferrochrome slag based concrete In the construction materials industry, expensive refractories (fire clay, silica, high- aluminous, etc.), are used as the main lining materials which despite their high fire resistance are inefficient for the use in thermal aggregates with an operation temperature up to 1300 °C. The purpose of the research was to develop heat-resistant concrete on the basis of sodium silicate binder and liquid glass with application of ferrochrome slag. Studies on the use of ferrochrome slag to obtain heat-resistant concrete are quite limited. It is common to apply self-scattered ferrochrome slag as a hardener when liquid glass is used. Carbonaceous ferrochrome slag is used when getting sodium silicate binder and as a filler together with other fire-resistant materials. Therefore, development of lowcomponent heat-resistant concrete, which contains in the binder and filler the same raw materials with uniform-phase structure, represents a certain scientific and practical interest. On the basis of carbonaceous ferrochrome slag, sodium silicate binder and heat-resistant concrete with uniform-phase structure have been developed. Also a heat-resistant concrete mix has been developed with an application of liquid glass and without any special hardener. Curing of concrete on sodium silicate binder was carried out by drying in the range of temperatures of 100-200 ° C, curing of concrete on liquid glass was done with drying in the range of temperatures of 105±5 оС. Compression strength of concrete on sodium silicate binder after drying was 26.2 MPa, compression strength of concrete on liquid glass was 25.8 MPa. 10.5862/MCE.51.5 heat-resistant concrete ferrochrome slag filler silicate-sodium compositional binder liquid glass drying fire resistance https://engstroy.spbstu.ru/article/2014.51.6/ 06.pdf
RAR RUS 46-54 Kazan State University of Architecture and Engineering Krasinikova Natalia knm0104@mail.ru
Kazan, Russia
 Kazan State University of Architecture and Engineering Morozov Nikolai nikola_535@mail.ru Kazan State University of Architecture and Engineering Borovskikh Igor borigor83@gmail.com Kazan State University of Architecture and Engineering Khozin Vadim borigor83@list.ru
Kazan, Russia
 Experience of introduction of fine-grained concrete when producing road plates In this paper an example of introduction of fine-grained concrete in production of ferroconcrete products is reviewed. The study is important because a high-quality material can be obtained with the use of local raw materials. Advantages of high-strength fine-grained (sandy) concrete are decrease in the mass of structures in bearing elements of buildings due to the reduced volume of concrete (to 50%). This decrease minimizes use of all materials being part of concrete (down to 50%), and when sizes of sections are equal, it is also possible to cut down the expenses on reinforcing steel (by 30%). Moreover, labor input on production, transportation costs and the given expenses decrease too. The traditional concrete mix for road plates of permanent roads (coarse-grained concrete of the class B25) has been replaced by the developed fine-grained B60 concrete. It was shown that the use of sandy concrete of the class B60 for production of road plates leads to increased bearing capacity. Tolerance by deformation indicators is 80%, by strength indicators more than 100% with respect to the control loadings specified in Russian standards. 10.5862/MCE.51.6 fine-grained concrete supersofteners grain structure fillers durability road plate https://engstroy.spbstu.ru/article/2014.51.7/ 07.pdf
RAR RUS 55-65 Peter the Great Saint Petersburg Polytechnic University Kondrashov Nikita nikita.kondrashov@gmx.de
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Shestopalov Aleksandr shestop-37@yandex.ru
Polytechnicheskay, 29
 Dynamic modulus application in the asphalt compaction rheological model for pavement construction This paper studies the existing hot-mix asphalt compaction technology and points out that designation of the appropriate asphalt rollers and working parameters has to be performed in accordance with mechanical characteristics of the layer. A way to avoid defects during the rolling process is proposed based on determination of material properties before starting asphalt compaction. Due to a large variety of used types and compositions of asphalt mixes, determination of their characteristics by practical consideration is impossible. The study considers the method for determination of asphalt mechanical properties based on implementation of the time-temperature superposition principle. A procedure for dynamic modulus computation at each stage of the compaction process has been developed. Comparison of calculation output with experimental data verifies the determined relation for dynamic modulus. Consideration of this parameter allowed developing a new mathematical formulation for the rheological model of roller-asphalt interaction. The conclusion is drawn pointing that application of the approach for the development of compaction technology based on calculation of dynamic modulus will result in enhanced pavement quality along with reduced labor expenditure and higher cost saving. 10.5862/MCE.51.7 asphalt compaction dynamic modulus road roller rheological model https://engstroy.spbstu.ru/article/2014.51.8/ 08.pdf
RAR RUS 66-73 Peter the Great St. Petersburg Polytechnic University Minaev Oleg minaev.op@bk.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 The selection and use method of sandy ground compaction The article presents the research results on the choice of a method and main parameters of the deep vibrating compaction of sandy fill soil in foundations and practical experience data on large-scale testing of their main provisions in the natural environment. The main factor when choosing a method of the deep vibrating compaction of sandy soils is accepted by the author as a value of the dynamic vibration exposure required to achieve a given depth of the foundation compaction. The approbation of the choice of the method and the main parameters of the deep foundation compaction using shaker of longitudinal vibration with spatial seal was made by field tests on compaction of a powerful 9-meter soil layer of the sand dam body at the base of a high-speed road, and at other facilities. These data practical experience indicate a significant compaction of the sandy grounds with an effective method developed by the author to the relative density mainly corresponding to the dense composition. 10.5862/MCE.51.8 sandy foundation soil dynamic vibration methods of compaction dynamic vibration exposure depth of compaction particle size density relative density the modulus of soil elasticity the angle of internal friction of soil dense composition https://engstroy.spbstu.ru/article/2014.51.9/ 09.pdf
RAR RUS 74-79 Peter the Great Saint Petersburg Polytechnic University Velichkin Viktor V.Velichkin2011@yandex.ru
Polytechnicheskay, 29
 Management and reliability of construction programs The paper proposes a special kind of function of beta probability density distribution of the random variable to estimate probability of execution of the construction program in full and within the given timeframe. This function allows us to consider the impact of the effectiveness of the control system on the probability of the program execution in time. To achieve a high level of reliability of the realization of the construction program (at least 0.9 ), the strategies for performance of preliminary requirements for management system, accounting reserves of time and building structural redundancy in the organization of construction were proposed. Examples of the corresponding estimates are given. 10.5862/MCE.51.9 probability of program execution the probability value schedule reliability parameter control payment terms time reserves risks structural redundancy management efficiency https://engstroy.spbstu.ru/article/2014.51.10/ 10.pdf
RAR RUS 80-88 Pridneprovskaya Academy of Civil Engineering and Architecture Kapshuk Olga boal23@rambler.ru The National Academy of Environmental Protection and Resort Development Shalennyj Vasiliy v_shalennyj@mail.ru Adaptability to manufacture varieties of modern disassembled formwork systems With the development of monolithic construction an issue about improving the efficiency of its use appears. One of the ways to increase it is expedient use of formwork systems. The studies have shown problems in the existing regulatory documentation in relation to progressive shuttering. The paper describes methods and results of computational experiments to study the technical and economic indicators of the construction of monolithic frame in disassembled formwork. It describes the most well-known systems of such formwork in Ukraine, which can be used to concrete buildings under lease or purchase by a contracting organization. Significant differences of the resulting figures on duration, unit cost and labor intensity of concrete works on considering options technologies. The obtained results suggest that it is reasonable to account a variety of formwork systems and their conditions of use at a particular site. The methodology of modeling processes and their final technical and economic indicators can be used on other sites with expected improvement of technical and economic indicators when a set of formwork is reasonably selected among those presented on the market, available for rent or owned by contracting organizations. 10.5862/MCE.51.10 formwork reserve methods calculation duration production cost technical and economic performance https://engstroy.spbstu.ru/article/2014.51.11/ 11.pdf