75504 2712-8172 Magazine of Civil Engineering 8 68 2016 1-91
RAR RUS 3-17 6506150284 0000-0003-1139-3164 Moscow State University of Civil Engineering (National Research University) Sainov Mikhail mp_sainov@mail.ru
Moscow, Russia
 National Research Moscow State Civil Engineering University Anisimov Oleg anisimov.apple@gmail.com
Moscow, Russia
 Stress-strain state of seepage-control wall constructed for repairs of earth rock-fill dam  Methodology and the results of numerical modeling of stress-strain state (SSS) of an earth-rockfill dam are considered, where after a failure of the clay core there was created a new seepagecontrol element presented by a clay-cement concrete wall. Calculations were conducted on the example of the dam section of Kureyka HPP, where emergency situation occurred in 1992. For repairs of the 25 high dam in the core and in the foundation there was arranged a 35 m deep wall made of bored piles. SSS analyses of the dam were conducted with use of the computer program elaborated by the author. This permitted consideration in the analyses of a number of important factors such as the sequence of the dam and the wall construction, non-linearity of soils deformation, their subsidence as well as timedependent variation of seepage forces. Seepage calculations showed that load on the piles from seepage flow is formed over a long time due to the durable process of the wall construction. If piles are arranged sequentially, one pile after another, during this time clay-cement concrete acquires about 50 % of design strength. If the wall is constructed in 2 stages, clay-cement concrete acquires about 80 % of its strength. SSS analyses showed that the wall in the failed dam performs in complicated conditions: due to a non-uniform structure of soil mass, it is subject to complicated bending deformations. To avoid the appearance of tensile stresses in the wall it is recommended to make the wall of plastic clay-cement concrete whose deformation is close to deformation of soils. 10.5862/MCE.68.1 earth-rockfill dam cut-off wall dam failure soil subsidence stress-strain state claycement concrete seepage load bored piles https://engstroy.spbstu.ru/article/2016.68.1/
RAR RUS 18-25 Peter the Great St. Petersburg Polytechnic University Kostenko Valeriya kostenkolera@gmail.com
St. Petersburg, Russia
 Peter the Great St. Petersburg Polytechnic University Gafiyatullina Nailya gnelly12@mail.ru
St. Petersburg, Russia
 Peter the Great St. Petersburg Polytechnic University Semchuk Anna annesemchuk@gmail.com
St. Petersburg, Russia
 6504322361 0000-0002-5471-2068 Peter the Great St. Petersburg Polytechnic University Kukolev Maxim m_kukolev@mail.ru
St. Petersburg, Russia
 Geothermal heat pump in the passive house concept An actual problem is reducing the cost of engineering systems maintenance of buildings and constructions. These costs include transportation of energy resources from source to consumer, complexity of the heating systems, caused by a large amount of equipment, and as a consequence, the presence of excessive heat losses. One solution is construction of buildings that meet modern energy efficiency requirements. A set of parameters that contribute to the implementation of the "Passive House" concept was considered, including the use of geothermal heat pumps for the heating system as an alternative production of thermal energy. The main characteristics of the heat pump were established. It was revealed that the cost of heating and air conditioning will not exceed the maximum. The economic efficiency of the chosen technical solution was considered. This research has the prospect of further development. 10.5862/MCE.68.2 energy efficiency buildings construction energy saving passive house alternative energy source geothermal energy heat pumps feasibility study https://engstroy.spbstu.ru/article/2016.68.2/
RAR RUS 26-36 57194109969 0000-0002-7413-842X Siberian Federal University Nazirov Rashit nazirovra@gmail.com
Krasnoyarsk, Russia
 Siberian Federal University Verkhovets Sergey sverhovec@sfu-kras.ru
Krasnoyarsk, Russia
Siberian Federal University Inzhutov Ivan ivaninzhutov@gmail.com
Krasnoyarsk, Russia
Siberian Federal University Bazhenov Roman bazhenovrv@gmail.com
Krasnoyarsk, Russia
Siberian Federal University Tarasov Igor tarasovs_box@mail.ru
Krasnoyarsk, Russia
Moisture sorption models for wood While making calculations for non-steady heat-and-moisture exchange processes in building envelope constructions it is necessary to consider moisture sorption isotherms of the materials in use. Fifteen aqueous vapor sorption models have been analyzed in order to select the simplest one that represents conventional equilibrium wood moisture values in the most accurate way. Hailwood-Horrobin and Peleg modified equations with three and four empirical constants respectively are the most suitable ones for description. When selecting models for calculations in a climatically defined range of air temperature and relative humidity values, these equations might be in preference to others. The dependence of the constants in these equations on the ambient air temperature have been calculated. 10.5862/MCE.68.3 moisture of wood sorption isotherm mathematics model temperature dependent models numerical calculations of wooden structures https://engstroy.spbstu.ru/article/2016.68.3/
RAR RUS 37-44 Peter the Great Saint Petersburg Polytechnic University Bondarenko Ekaterina katyushka-bond@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Il'ina Khristina Ilin220396@yandex.ru
Polytechnicheskay, 29
 Andrianova Maria Peter the Great Saint Petersburg Polytechnic University Chusov Alexander chusov17@mail.ru
Polytechnicheskay, 29
 Main inorganic ions and electric conductivity of polluted urban streams Concentrations of main inorganic ions were determined in waters of city streams affected by domestic and industrial wastewaters – the Okhta and the Murinsky creek in St. Petersburg. It was shown that pollution of streams led to increasing of molar fraction for sodium ion and chlorides, decreasing of molar fraction of magnesium, calcium, sulfates and hydrocarbonates. These changes took place while electric conductivity of waters was increasing. Positive correlation coefficients (from 0.35 to 0.63) were found between molar fraction of sodium and parameters connected with wastewater pollutants: total nitrogen (TN), ratio of TN to TOC (total organic carbon), ratio of protein-like fluorescence (excitation at 230 or 270 nm, emission at 350 nm) to humic-like fluorescence (excitation at 230 or 270 nm, emission at 420 nm). The obtained results show that electric conductivity can be applied as an express-method for environmental monitoring in the studied streams. Additional use of ions molar fractions for such purpose is also possible. 10.5862/MCE.68.4 wastewater river water; ions electric conductivity environmental monitoring civil engineering https://engstroy.spbstu.ru/article/2016.68.4/
RAR RUS 45-57 Ponomarev Andrey 9293522@gmail.com Peter the Great Saint Petersburg Polytechnic University Rassokhin Aleksandr rassokhinaleksandr@gmail.com
Polytechnicheskay, 29
 Hybrid wood-polymer composites in civil engineering The interest in wood-based materials and structures is increasing every year, and as a result, attempts are constantly being made to modify it, in order to increase mechanical and operational characteristics. In this case the complicating circumstances are the contradiction between the hydrophilic nature of wood and water repellence of the majority of the thermosets that can significantly affect the properties of wooden parts and structures. The paper analyzes the state of research in this area and draws conclusions in favor of methods of wood gradient impregnation with reinforcing water-compatible epoxy thermosets and external as well as interlayer reinforcement of wood structures with high-strength glass-, basalt-, organo- and carbon-fiber ribbons with anisotropic properties. The possibility of modification of water-compatible epoxy polymers by carbon micro- and nanoparticles of new species was also studied. The results of the pilot studies of the wooden details gradient impregnated with the water compatible epoxy compositions modified by sulfoadducts of nanoclusters of carbon ("Ugleron C") and carbon nanoporous microfibers (CNPMF) are given. The possibility and features of external reinforcing of the wooden details by glass ("Е" – type fibre), carbon (on the basis of carbon fibers) was considered and the case of the basalt and polyaramid unidirectional tapes was estimated. The technology of the additional strengthening the wooden details by an external membrane from a multifunctional composite water compatible coating – the "EpoxyPAN" was offered. Results of the tests the samples of the wooden details covered with a continuous membrane from "EpoxyPAN" have confirmed the previous assumptions of the prospects of such technology. Thus, the possibility of creation of the hybrid wood-polymer composites (HWPC) of new types is proved and problems of further work are formulated. 10.5862/MCE.68.5 hybrid wood-polymer composites impregnation thermosets glass basalt carbon tapes external and interlayer reinforcing watersoluble sulfoadducts of the carbon nanoclusters (“Ugleron С”) carbon nanoporous microfibres EpoxyPAN. https://engstroy.spbstu.ru/article/2016.68.5/
REV RUS 58-64 AAV-2280-2020 48361113100 0000-0001-9004-7889 Riga Technical University Borodinecs Anatolijs anatolijs.borodinecs@rtu.lv
Riga, Latvia
 0000-0002-7812-3540 Riga Technical University Zemitis Jurgis jurgis.zemitis@rtu.lv
1 Kalku Street, Riga LV-1658, Latvia
 Riga Technical University Sorokins Juris juris.sorokins@gmail.com
Riga, Latvia
 Peter the Great Saint Petersburg Polytechnic University Baranova Daria baranova-d@mail.ru
Polytechnicheskay, 29
 Bryden Wood Technology Ltd Sovetnikov Daniil sovetnikov.daniil@gmail.com
London, UK
 Renovation need for apartment buildings in Latvia Residential buildings in Latvia are one of the essential heat consumers during the heating season. The majority of Latvian as well as European residential buildings were constructed within the period from 1965 to 1990. Introduction presents brief overview of current situation in Latvian and EU countries. This chapter provides overview of real energy consumption and definition of buildings technical conditions. Materials and methods are based on evaluation of standardized energy consumption in two kindergartens and multi apartment buildings including also dynamic energy simulation. Chapter on thermal performance of building envelope provides an extensive comparison of heat transfer coefficients in non-renovated buildings as well as comparison with normative values. Section on energy consumption of existing multi apartment buildings presents review of buildings real energy consumption before and after renovation. In addition this chapter evaluated indoor air quality. This study was done in order to define necessary reconstruction goals to reach European Regional Development Fund project “A New Concept for Sustainable and Nearly Zero-Energy Buildings” Nr. 1.1.1.1/16/A/007 main targets. 10.5862/MCE.68.6 Latvian building stock apartment buildings energy efficiency energy audit ventilation https://engstroy.spbstu.ru/article/2016.68.6/
RAR RUS 65-75 57194104035 0000-0002-6640-103X National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Bilous Inna biloys_inna@ukr.net
Kyiv. Ukraine
 6506189670 0000-0002-8218-3933 National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Deshko Valeriy te@kpi.ua
Kyiv, Ukraine
 57140834000 0000-0002-5895-1306 National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute” Sukhodub Irina ira_krot@ukr.net
Kyiv, Ukraine
 Building inside air temperature parametric study Nowadays energy resources saving problem is extremely important, especially for heating in buildings. The aim of the paper is to simulate indoor air temperature depending on heating rate, solar heat gains, infiltration rate and outdoor air temperature. In order to get the desired result dynamic model of the room was created in EnergyPlus program, which is a widely used building energy simulation program. Based on the developed model and modified IWEC weather data the series of simulations were performed for inside air temperature calculation depending on internal and external factors changes. The analysis of individual and aggregate factors influence on inside air temperature change is performed. The multiple linear regression model structure is analysed and background of factors change over the past three days is chosen. Regression models for daily average inside air temperature dependence on each of the factors and all of them are created. Results verification is performed for prognosis values of temperature in comparison with simulation for December weather data from IWEC. Regression models can be used for complex analysis of problems connected with selecting heating rate, influence assessment of climatic conditions on indoor air temperature, qualitative and quantitative heating system regulation. 10.5862/MCE.68.7 energy efficiency modeling; heating rate air exchange inside air temperature climatic data regression https://engstroy.spbstu.ru/article/2016.68.7/
RAR RUS 76-85 National Research Moscow State Civil Engineering University Larsen Oksana larsen.oksana@mail.ru
Moscow, Russia
 National Research Moscow State Civil Engineering University Naruts Vitaliy insolent88@mail.ru
Moscow, Russia
 Self-compacting concrete with limestone powder for transport infrastructure At the beginning of XXI century in civil engineering and buildings of transport infrastructure, such as tunnels, elements of bridges, viaducts and roads, it is more expedient to use conventionally vibrated concretes which have almost universally replaced prefabricated constructions. However, in objects with high congested reinforcement or in cases where vibration is impossible it is more preferable to apply self-compacting concrete (SSC) mixtures. SCC possesses the ability to take form shape without any mechanical aid. The most important requirement for SCC is high flowability without the segregation of aggregate during placement. Despite the low water-cement ratio of the fresh self-compacting concrete mixture the bleeding is still possible. That is why fillers such as natural pozzolana, calcined clay (metakaolin), silica fume, fly-ash, slag, and quarry dusts should be used. Furthermore, mineral admixtures can improve energy efficiency and particle packing, decrease cost and permeability of self-compacting concrete. In this study, the properties of SCC with limestone powder as partial replacement of Portland cement was established by applying mathematical experiment planning method. The obtained SCC gave high early compressive strength within 3 days in the range of 41.3 MPa while its 28 day strength ranged of 69.0 MPa. The result of this study indicated the possibility of adding limestone powder in SCC with optimum percentage content around 38 %. The researched SCC had density of hardened and fresh concrete mix in the ranges of 2438 kg/m3 and 2452 kg/m3 respectively. The investigated SCC concrete with limestone powder showed high rate of water permeability in the range of 1.6 MPa (W16) and high frost resistance in the ranges of F2400. It can be explained by additive’s high water retention capacity and increase of hydration degree and, as a consequence, decrease of capillary porosity. That is why the developed SCC with limestone powder has high compressive strength and excellent durability performance. 10.5862/MCE.68.8 self-compacting concrete limestone powder energy efficiency strength buildings construction civil engineering water permeability frost resistance https://engstroy.spbstu.ru/article/2016.68.8/
RAR RUS 86-91 Peter the Great Saint Petersburg Polytechnic University Statsenko Elena staclena@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Ostrovaia Anastasiia stasya2609@yandex.ru
Polytechnicheskay, 29
 57189345350 0000-0002-8380-0067 Peter the Great St. Petersburg Polytechnic University Koriakovtseva (Musorina) Tatiana
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 6504322361 0000-0002-5471-2068 Peter the Great St. Petersburg Polytechnic University Kukolev Maxim m_kukolev@mail.ru
St. Petersburg, Russia
 56426211200 0000-0002-3541-0072 Peter the Great Saint Petersburg Polytechnic University Petrichenko Mikhail fonpetrich@mail.ru
Polytechnicheskay, 29
 The elementary mathematical model of sustainable enclosing structure Energy efficiency building envelopes (walls, floors, facades) should meet the requirements of regulatory documents. The main attention is paid to structural and technological activities aimed at increasing the thermal resistance of protections. Estimates of the thermal stability of the wall are required for realization of high thermal resistance of the wall structure. The object of study is a simple model of the building envelope. It has been shown that the increased thermal conductivity, thermal resistance does not always provide the steady-state temperature faces the wall. Research method is based on the analysis of the properties of the Cauchy problem. In this article it is found out the connection between the active (thermal resistance) and reactive (accumulation) resistance enclosure on the model of one-dimensional wall. 10.5862/MCE.68.9 buildings construction civil engineering energy efficiency temperature humidity conditions the accumulation of heat wall enclosure problem of Cauchy https://engstroy.spbstu.ru/article/2016.68.9/