Magazine of Civil Engineering, №8(34), 2012
Builduing materials and articles. Building envelope


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Энергоэффективность переходит на новый уровень

Energy efficiency is brought up to standard (rus)

November, 21-22th, in Saint-Petersburg the 4th International Congress "Energy efficiency. XXI century. Engineering methods for decreasing energy consumption in buildings" took place. Despite the fact that this event take place in the city for the forth time, it was of such a scale for the first time. The program of the congress included a panel discussion, 7 round tables, 2 seminars and a scientific conference.
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 STRUCTURES
Влияние уровня тепловой защиты ограждающих конструкций на величину потерь тепловой энергии в здании

N.I. Vatin, D.V. Nemova, P.P. Rymkevich, A.S. Gorshkov
Influence of building envelope thermal protection on heat loss value in the building (rus)

The research presents the calculations for the heat losses through the envelope of the apartment building. The calculations are provided for different levels of insulation of enclosing structures (i.e. wall, windows, roof etc) according to three normative documents: Set of rules 50.13330.2012 (rus), Construction Norms and Regulations 23-02-2003 (rus) and National Building Code of Finland, Part D3 (fin).
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Оценка рисков устройства фасадных теплоизоляционных композиционных систем при суточных колебаниях температуры воздуха ниже +5°C

S.A. Pashkevich, A.P. Pustovgar, A.O. Adamtsevich
Risk evaluation of composite heat insulation fasade systems installation in the conditions of diurnal temperature variations under +5°C (rus)

For the qualitative risk assessment of the operational properties reduction for plaster layers of walling, in this paper a full-scale laboratory simulation of the production of external thermal insulation composite systems in conditions of unstable diurnal fluctuations in air temperature was conducted using a mobile stand for facades trials.
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 CALCULATIONS
Работа штукатурных покрытий в составе современных теплоэффективных наружных стен зданий

V.V. Babkov, D.A. Sinitsin, R.S. Kildibaev, O.A. Rezvov, A.E. Chuikin
Behavior of plasters on the modern heat-effective exterior walls of buildings (rus)

Results of quantitative estimation of stresses in the plaster layers on surfaces of different stiffness due to the plaster shrinkage are given. It is shown that with a decrease of the surface modulus of elasticity, stresses in the plaster coating are decreased either due to reduction of the effect of its deformations’ constraint.
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Теоретические предпосылки оптимизации рецептурно-технологических параметров штукатурных растворов для стен, выполненных из газобетонных блоков

V.A. Paruta, A.A. Sayevskiy, Yu.A. Semina, E.A. Stolyar, A.V. Ustenko, E.V. Brynzin
Theoretical preconditions for optimization of composition and technological parameters of the plaster for walls made of aerated concrete blocks (rus)

The paper reveals the mechanism of cracking in the "aerated concrete masonry - plaster coating" system, which causes the reduction of cladding’s durability. The temperature deformations in the structure are analyzed. The composition of plaster mixtures based on the expanded clay, carbonate, perlite and other fillers was also developed.
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 MATERIALS
Сухие строительные смеси с применением местных материалов Пензенского региона

V.I. Loganina, E.R. Akzhigitova, G.D. Fadeev
Dry mixes containing local materials of Penza region (rus)

Possibility of application of mixed-layer clays of the Penza region as a structuring additive in lime dry mixes is considered. It is indicated that introduction of the clay burned at temperature of 400-550°С in number 10% from mass of a lime promotes durability increase in compression that is 17,85-63%, as a function of technology, temperature of  baking and a type of clay.
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Исследование возможности модификации карбоксилатных пластификаторов в составе модифицированных мелкозернистых бетонных смесей

S.S. Kiski, A.N. Ponomarev, I. V. Ageyev, A. A. Kozeyev, M. Ye. Yudovich
Investigation of carboxylate plasticizer modification potential in modified fine-grained concrete mixes (rus)

The article contains experimental data on new French giperplasticizer PREMIA 360 and the findings of how to increase its effectiveness. Also the results of modification PREMIA 360 by the water-soluble adducts of carbon nanoclusters (Astralenes C) together with a new pozzolanic additive - ash shale Zolest Bet are presented and discussed.
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Бетоны нового поколения на основе сухих тонкозернисто-порошковых смесей

V.I. Kalashnikov, O.V. Tarakanov, Y.S. Kusnetsov, V.M. Volodin, E.А. Belyakova
Next generation concrete on the basis of fine-grained dry powder mixes (rus)

The testing results and physicotechnical properties of next generation concretes with low specific consumption of cement per unit of strength are given. It is shown that next generation concretes can be not only high strength and super-high strength ones, but also general purpose concretes with the strength performance of Class V15–V40 with specific cement consumption per unit of compression strength equal to 3–5 kg/MPa.
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 TECHNOLOGY
Особенности подбора химических модификаторов для экструзионной технологии бетонов

D.O. Baydzhanov, E.K. Byunau, O.A. Malyshev
Particularities of chemical modifiers selection for fabricating concrete articles by extrusion technology (rus)

The purpose of the present work is developing the requirements for the chemical modifiers defining their suitability in extrusion technology for formation of articles from concrete and reinforced concrete. According to the results of researches it is established that the olein acid is suitable for the extrusion technology of concrete formation. Use of engine oil 5W-50 is not effective because of its carcinogenic properties.
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Высокопрочный фибробетон для промышленного и гражданского строительства

S.V. Klyuyev 
High-strength fiber concrete for industrial and civil construction (rus)

It is established that the application of composite binder and high density packing of the grains raises much the durability indicators. Algorithm and program for composition calculation of fine-grained steel fiber concrete based on technogenic sands enriched with Tavolzhan sands, that allow to get more compact packing of elongated pieces are developed.
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Ускоритель твердения бетона на основе гальванического шлама

S.V. Stepanov, N.M. Morozov, V.G. Khozin
Concrete hardening accelerator containing galvanic sludge (rus)

In this paper we propose the use of galvanic sludge, which structure contains oxide, hydroxide and aluminum sulphate. Its use leads to an increase in the strength of cement stone in the first hours and days of hardening, as the number of Ettringite increases in the system.
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 TESTING
Эффективность добавок ускорителей схватывания и твердения для торкрет-бетона

Yu.G. Barabanshchikov, A.S. Vasilyev
The effectiveness of setting and hardening accelerators for sprayed concrete (rus)

This study found that alkali-free setting and hardening accelerators for sprayed concrete, based on aluminum compounds, when added in cement paste after 20 minutes after preparation, provide a sharp rise in heat generation and temperature, and significantly accelerate the setting and hardening of cement paste.
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Применение пленкообразующего препарата для увеличения стойкости бетонных изделий в условиях резкого континентального климата

L.V. Yankovsky
Application of the film-forming material for increasing concrete articles firmness in cold continental climate (rus)

Results of natural experiments devoted to exploring the influence of film-forming agent on durability of cement concrete products with their subsequent operation under the impact of rigorous climate are shown. In the manufacturing of production in thermoshaping machines the most positive effect is in sharing of plasticizer and film-forming mechanism with the subsequent protection of concrete.
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