75504 2712-8172 Magazine of Civil Engineering 6 66 2016 1-67
RAR RUS 3-11 Tomsk State University of Architecture and Building Shepelenko Tatiana shepta72@mail.ru Tomsk State University of Architecture and Building Sarkisov Yuri sarkisov@tsuab.ru
Tomsk, Russia
 Tomsk State University of Architecture and Building Gorlenko Nicholas Gorlen52@mail.ru Tomsk State University of Architecture and Building Tsvetkov Nicholas nac.tsuab@yandex.ru
Tomsk, Russia
 Tomsk State University of Architecture and Building Zubkova Olga zubkova0506@mail.ru Structure-forming processes of cement composites, modified by sucrose additions  The effect of sucrose on the kinetics of cement hardening has been studied. The study was carried out in two comparative ways, one of which had the organic modifier introduced into cement as gauging liquid (“water – 2% sucrose solution”), the other – as suspensions “cement – water – 2% sucrose solution”. The products of sucrose corrosion, synthesized in suspensions, were used as addition agents in the “cement – water” system. Suspension-based approach is interesting because of cement modification by introducing the corrosion products of the same cement, which provides setting acceleration and higher composite density.The structurization role of addition agents, containing products of sucrose corrosion of cement, is provided by synergetic influence of several factors: intensive growth of ettringite crystal nuclei – the main reinforcement component of a cement system, reduction of Са(ОН)2 in solid phase of a rock, CSH-gel densifying and plasticizing. The use of sucrose as gauging liquid results in adverse effect for isolation of cement particles by adsorption layers, impeding the hydration, growth and possible coalescence of crystal – the destructurization of the setting system: the rocks, available from cement gauging with 2 % sucrose solution were not set during the whole trial period. The results were interpreted by means of physic-chemical approaches: X-ray phase analysis, IR-spectroscopy, differential thermal analysis. 10.5862/MCE.66.1 cement sucrose products of sucrose corrosion of cement addition agent density https://engstroy.spbstu.ru/article/2016.66.1/ 01.pdf
RAR RUS 12-22 Petersburg State Transport University Smirnova Olga smirnovaolgam@rambler.ru
St. Petersburg, Russia
 Compatibility of portland cement and polycarboxylate-based superplasticizers in high-strength concrete for precast constructions Application of polycarboxylate-based superplasticizers can contribute to the increase of concrete early strength. It makes possible to obtain the concrete of the required strength after heatsteaming treatment with decreasing the isothermal temperature and the Portland cement quantity compared to the concrete without admixtures. Reducing of water-cement ratio and lack of accelerated high-temperature of heat-steaming treatment raises the durability of precast concrete. The use of low heat-steaming treatment must not lead to an increase of the duration of treatment and reduction of productivity of plant with double turnover of moulds per day. It is necessary to take into account the compatibility of Portland cement and polycarboxylate-based superplasticizers to obtain the high concrete strength after heat-steaming treatment. The problem of the compatibility of Portland cement and polycarboxylate-based superplasticizers in precast concrete production contains the following items: the influence of chemical and mineralogical compositions of Portland cement on the water-reducing effect of polycarboxylate-based superplasticizers, on the retention of workability of fresh concrete as well as on the growth of early concrete strength. Most of the published papers contain the results received when investigating the cement paste. However, the effect of polycarboxylate-based superplasticizers in stiff fresh concrete has not yet been fully investigated. The optimal dosages of polycarboxylate-based superplasticizers, requirements to the granulometric and chemical-mineralogical compositions of Portland cements with the purpose of reducing the cement consumption and providing the required concrete strength after the heat-steaming treatment at 40 °C have been defined. 10.5862/MCE.66.2 building materials construction precast concrete heat-steaming treatment polycarboxylate-based superplasticizer stiff fresh concrete https://engstroy.spbstu.ru/article/2016.66.2/ 02.pdf
RAR RUS 23-34 Industrial University of Tyumen Naumkina Julija naujul@rambler.ru
Tyumen, Russia
 Industrial University of Tyumen Pronozin Yakov geofond.tgasu@gmail.com Industrial University of Tyumen Epifantseva Larisa epifanceva82@gmail.com
Tyumen, Russia
 Load-bearing capacity of soil loaded with strip-shell foundations The paper describes the special features of the calculation based on the load-bearing capacity of soil loaded with strip-shell foundations which offer high efficiency in construction of medium and high-rise buildings on strongly compressible soils. The necessity of this calculation is caused by the requirements of Building Regulations. Problem solution of load-bearing capacity of subsoil with a bent cylindric surface based on the known Prandtl Solution was considered. The new static solution to the Coulomb's wedge theory of load-bearing capacity of soil loaded with strip-shell foundations (SSF) indicating that taking into account a bent surface of the soil under the shell and the counterweight from strip foundations make it possible to reasonably increase the load-bearing capacity of soil. 10.5862/MCE.66.3 load-bearing capacity strip foundations compressible soils shell https://engstroy.spbstu.ru/article/2016.66.3/ 03.pdf
RAR RUS 35-48 Siberian State Automobile And Highway Academy Aleksandrov Anatoliy Aleksandrov00@mail.ru
Omsk, Russia
 Siberian State Automobile And Highway Academy Kalinin Alexsandr a1exsandr55ne@mail.ru
Omsk, Russia
 Siberian State Automobile And Highway Academy Tsyguleva Margarita m.v.tsyguleva@gmail.com
Omsk, Russia
 Distribution capacity of sandy soils reinforced with geosynthetics A review of shear strength analysis methods for ground bases reinforced with geosynthetics is given in the article. An angle of stress dispersion has been found to be the parameter of soils and discrete materials which were calculated according to the experimental data. The analysis of mathematical models that connect the angle of stress dispersion with other soil parameters which are ascertained in the laboratory was performed. This analysis shows the absence of direct experimental methods for investigation of distribution capacity. For this reason indirect measurements are used to calculate the angle of stress dispersion. The direct method for measuring distribution capacity has been developed on the basis of a colour strip analysis. There are two variants. The first way deals with photo interpretation, the second one uses full-scale models for direct measurements. Statistical analysis shows that reinforcement of ground bases increases distribution capacity of the soil under the geosynthetics.  10.5862/MCE.66.4 stress dispersion angle load distribution angle geosynthetics reinforcement of soil basements distributing ability colour strip analysis https://engstroy.spbstu.ru/article/2016.66.4/ 04.pdf
RAR RUS 49-59 6602848417 0000-0002-0587-4722 National Research Moscow State Civil Engineering University Kantardgi Izmail kantardgi@yandex.ru 7004066045 0000-0001-7723-6052 Institute Environmental Radioactivity, Fukushima University Zheleznyak Mark zheleznyak.m@gmail.com Laboratory and numerical study of waves in the port area  Parameters of waves in water area of the projected port are normally obtained using physical and numerical modelling. Physical modelling allows defininig structural details of the port’s facilities and provides with information for the appropriate selection of a numerical model. The problems created by this approach are shown in the case study of the projected port in Vostok (East) Bay, the Sea of Japan. The experimental study of waves propagation in the port water area was carried out in the wave basin. The port area was reproduced at a scale of 1:50, and the modelling was conducted under the Froude number similarity. Experimental results are provided for the study of wave propagation in the port model from the effects of the waves of 5 % exceedance probability. To confirm the results of the laboratory experiments, four relevant mathematical models were used, one of them is the ARTEMIS model which is based on gentle slopes equations. The heights of numerically modeled waves in the control points were compared with the waves measured with sensors-wave gauges. The calculated values at the control point and minimum and maximum values in a circular neighborhood with the radius of 30 m (1/4 of the average wavelength of 120 m) were compared with the results of the experiments. The proposed approach allows comparing the results of physical modelling with the results of numerical modelling and selecting the appropriate numerical model based on the results of the comparison. 10.5862/MCE.66.5 port area waves experiments and numerical modelling method of comparison standing waves https://engstroy.spbstu.ru/article/2016.66.5/ 05.pdf
RAR RUS 60-67 JSC "INSOLAR-INVEST" Vasilyev Gregory gpvassiliev@mail.ru JSC "INSOLAR-INVEST" Lichman Vladimir valitsch@mail.ru
Moscow, Russia
 JSC "INSOLAR-INVEST" Yurchenko Igor iyurchenko@insolar.ru
Moscow, Russia
 JSC "INSOLAR-INVEST" Kolesova Marina eco-insolar@mail.ru Method of thermotechnical uniformity coefficient evaluation by analyzing thermograms One of the primary problems solved for increasing energy efficiency of a building is increasing of the insulating properties of the building envelope. The paper describes the method for determining the coefficient of thermotechnical uniformity by analyzing a thermogram of parts of a building envelope. The method is based on obtaining temperature distribution matrix on the surface of a building envelope fragment by thermography. Two methods for assessing the coefficient of thermotechnical uniformity are proposed. One method for determining the coefficient of thermotechnical uniformity is based on obtaining mean temperature values by numerically processing thermograms, another on numerical integration along the contour lines of temperature curves.  10.5862/MCE.66.6 energy efficiency the coefficient of thermotechnical uniformity specific geometrical parameter thermal resistance temperature field temperature heating thermogram building construction https://engstroy.spbstu.ru/article/2016.66.6/ 06.pdf