75504
2712-8172
Magazine of Civil Engineering
8
34
2012
1-109
RAR
RUS
4-14
M-6585-2013
6508103761
0000-0002-1196-8004
Vatin
Nikolai
Peter the Great Saint Petersburg Polytechnic University
vatin@mail.ru
Polytechnicheskay, 29
56227381900
0000-0003-2673-4566
Nemova
Darya
Peter the Great Saint Petersburg Polytechnic University
darya.nemova@gmail.com
Polytechnicheskay, 29
Rymkevich
Pavel
Military Space Academy named after A.F. Mozhaysky
rymkewitch@yandex.ru
15730895100
http://orcid.org/0000-0003-3251-3356
Gorshkov
Alexander
Saint Petersburg State University of Industrial Technologies and Design
alsgor@yandex.ru
St. Petersburg, Russia
Influence of building envelope thermal protection on heat loss value in the building
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). The impact of level of thermal protection of external enclosure structures on the values of heat losses, the operating costs and the costs of fuel and energy resources during the heating period (for 10, 30 and 50 years of upkeep of buildings) on the example of the one habitable apartment building is analyzed. Calculation of payback periods of the energy saving actions directed on increase of level of thermal protection of external enclosure structures of buildings is given. Economic efficiency of investments in energy saving measures is analyzed.
10.5862/MCE.34.1
energy saving
transmission heat losses
apartment building
https://engstroy.spbstu.ru/article/2012.34.1/
01.pdf
RAR
RUS
15-21
Pashkevich
Stanislav
Moscow State Building University
pashkevich86@mail.ru
Pustovgar
Andrey
National Research Moscow State Civil Engineering University
nsm.mgsu@mail.ru
Adamtsevich
Aleksey
Moscow State University of Civil Engineering
MnSpecter@gmail.com
Risk evaluation of composite heat insulation fasade systems installation in the conditions of diurnal temperature variations under +5°C
Allowable temperature conditions for hydration processes of the majority hydraulic binders are in the range (+5... +30)°C. That is why temperature is important for work with ETICS - external thermal insulation composite systems. Period with an average daily outdoor temperature +5°C is quite arbitrary, because temperature can drop below the limit value in the night and unpredictable frosts promote the risk of slowdown (or termination) of hydration processes of hydraulic binders in the fresh plaster. 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 ETICS in conditions of unstable diurnal fluctuations in air temperature was conducted using a mobile stand for facades trials. According to the test results, a significant degradation in major performance in the case of daily fluctuations in air temperature below +5°C was determined.
10.5862/MCE.34.2
hydration
temperature
model; system
test
https://engstroy.spbstu.ru/article/2012.34.2/
02.pdf
RAR
RUS
22-29
7004630127
Babkov
Vadim
Ufa State Petroleum Technological University
babkov.ugntu@gmail.com
1, Kosmonavtov St., Ufa, Russia, 450062
Sinitsin
D.
Ufa State Petroleum Technological University
Chuikin
A.
Ufa State Petroleum Technical University
Kildibaev
Rinat
Georekon JSC
rbstroi@mail.ru
Rezvov
Oleg
Ufa State Petroleum Technological University
ufaoleg@bk.ru
Behavior of plasters on the modern heat-effective exterior walls of buildings
Physical and mechanical characteristics, the most significant for the plasters with regard to the features of their behavior as the coating of building faces were evaluated. 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. By analysis and with experiments it is proved, that the main factor evaluating the ultimate extensibility of the mortar is its viscoelasticity modulus, while mortar strength increase involves its stresses increase.
10.5862/MCE.34.3
plaster
stresses in plaster layers
viscoelasticity modulus
https://engstroy.spbstu.ru/article/2012.34.3/
03.pdf
RAR
RUS
30-36
Paruta
Valentin
Odessa State Academy of Civil Engineering and Architecture
docent2155@gmail.com
Sayevskiy
A.
Odessa State Academy of Civil Engineering and Architecture
Semina
Yu.
Odessa State Academy of Civil Engineering and Architecture
Stolyar
E.
Odessa State Academy of Civil Engineering and Architecture
Ustenko
A.
Odessa State Academy of Civil Engineering and Architecture
Brynzin
E.
UDK GAZBETON
Theoretical preconditions for optimization of composition and technological parameters of the plaster for walls made of aerated concrete blocks
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. On this basis the theoretical background to optimize the composition and technological parameters of the plaster was developed. The composition of plaster mixtures based on the expanded clay, carbonate, perlite and other fillers was also developed. The proposition that targeted modification of plaster can ensure optimal operation of the "layingplaster" system is experimentally confirmed.
10.5862/MCE.34.4
autoclaved aerated concrete
plaster for aerated concrete
selection of plaster
https://engstroy.spbstu.ru/article/2012.34.4/
04.pdf
RAR
RUS
37-41
6602801860
0000-0001-7532-0074
Loganina
Valentina
Penza State University of Architecture and Construction
loganin@mail.ru
0000-0001-9536-8112
Akzhigitova
Elvira
Penza State University of Architecture and Construction
il2018vira@mail.ru
Penza, Russia
Fadeeva
G.
Penza State University of Architecture and Construction
Dry mixes containing local materials of Penza region
One of the ways to get the active mineral admixtures for dry mixes is kaolin clay baking at temperature of 600-800°С. The reason for application such an additive is that among all modern minerals the most reaction-active towards a lime is metakaolinite. Possibility of application of mixed-layer clays of the Penza region as a structuring additive in lime dry mixes is considered. Differential-thermal analysis of kaolinite clays from various deposits was carried out. The structure of sand-lime specimens was being studied by method of X-ray phase analysis. Efficiency of application of clay that was baked at temperature of 400-500°С is shown. 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.
10.5862/MCE.34.5
clay
roasting
durability of a lime composite
https://engstroy.spbstu.ru/article/2012.34.5/
05.pdf
RAR
RUS
42-46
Kiski
Svetlana
Peter the Great Saint Petersburg Polytechnic University
svkiski@yandex.ru
Polytechnicheskay, 29
I.V. Ageyev
I.
“NTTS PN” Private Joint Stock Company
-
St. Petersburg, Russia
Ponomarev
Andrey
9293522@gmail.com
Kozeyev
A.
Scientific Technical Center of Applied Nanotechnology
Yudovich
M.
Investigation of carboxylate plasticizer modification potential in modified fine-grained concrete mixes
The widespread practice of using the modern oligocarboxylated giperplasticizers of the latest generation is caused by a number of objective reasons: the necessity of the improving the technology of concrete mix placement with gradual transition to the self-compacting concretes, a serious increase in the ecological and sanitary requirements to the modern building materials. For example: sulfonaphtalene plasticizers series C-3, SP-1 and SP-3 were restricted to use in the EU-countries in 2011. However the cost of carboxylate additives is very expensive and it is much higher, than the cost of sulfonaphtalene plasticizers, that is why the ways of increasing their efficiency with the following reduction of dosage are economically profitable. 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. It was demonstrated the possibility of reduction of the plasticizer concentration twice with the increasing of the modified fine concrete mobility at the same time and substantial increasing in compositions’ strength.
10.5862/MCE.34.6
building materials
nanotechnology
nanoadditives
https://engstroy.spbstu.ru/article/2012.34.6/
06.pdf
RAR
RUS
47-53
Kalashnikov
V.
Penza State University of Architecture and Construction
mn.moroz80@gmail.com
7004757888
Tarakanov
Oleg
Penza State University of Architecture and Construction
zigk@pguas.ru
28, Germana Titova str, Penza, Russia, 440028
Kusnetsov
Yu.
Penza State University of Architecture and Construction
Volodin
V.
Penza State University of Architecture and Construction
Belyakov
Elena
Penza State University of Architecture and Construction
var_lena@mail.ru
Next generation concrete on the basis of fine-grained dry powder mixes
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 application of fine-grained dry mixes for production of all sorts of next generation concrete: reacting-powder, sand powder-activated and crushed-stone powder-activated, will allow improving the durability of concretes and reducing specific consumption of cement per unit of strength. It is evident 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. To achieve such technical and economic criteria, it is necessary to optimize the composition of rheological matrices in the concrete.
10.5862/MCE.34.7
high strength concrete
general purpose concrete
next generation concrete
superplasticizer
stone powder
specific cement consumption per unit of strength
https://engstroy.spbstu.ru/article/2012.34.7/
07.pdf
RAR
RUS
54-60
57193760645
0000-0002-4701-3840
Baydjanov
Djumageldy
Karaganda State Technical University
BDO3@yandex.ru
Byunau
E.
Open Joint Stock Company Gazprom
Malyshev
O.
Strimer-Tsentr
Particularities of chemical modifiers selection for fabricating concrete articles by extrusion technology
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. Experiment has been made by use of possibility of IK MGT to register synchronously the changes of pressure, volume and temperature at constant weight of the research sample. The research has shown that some substances such as paraffin and benzene at volume compression have phase transition from a liquid condition to the firm one. Taking into account the importance of phase transition of the first sort for the extrusion technology of concrete articles formation it is possible to confirm that substances which have the similar structural changes in testing range PVT parameters are not suitable for modifying of a concrete mix according to the given technology. Thus, 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.
10.5862/MCE.34.8
modifiers
extrusion methods
superplasticizers
phase transition
measuring complex the Mikrogeo-test
hydrophobisator
https://engstroy.spbstu.ru/article/2012.34.8/
08.pdf
RAR
RUS
61-66
Klyuev
Sergey
Belgorod State Technological University named after V.G. Shukhov
Klyuyev@yandex.ru
High-strength fiber concrete for industrial and civil construction
The issue of using steelfiber for dispersed reinforce of fine-grained concrete is considered in the article. Research of steelfiber concrete patterns based on cement and compositional astringent material was held. The fine-grained cement and the binder with low water demand were used as the main binder. 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. Optimal selection of filling material allowed to receive fiber concrete based on technogenic sand of Kursk Magnetic Anomaly with ultimate compressive strength equalled to 104,8 MPa, and with ultimate flexural strength 23,2 MPa for flexible structures.
10.5862/MCE.34.9
fine-grained concrete
anthropogenic sand
fiber concrete
https://engstroy.spbstu.ru/article/2012.34.9/
09.pdf
RAR
RUS
67-71
Morozov
Nikolai
Kazan State University of Architecture and Engineering
nikola_535@mail.ru
Stepanov
S.
Kazan State University of Architecture and Engineering
Khozin
Vadim
Kazan State University of Architecture and Engineering
borigor83@list.ru
Kazan, Russia
Concrete hardening accelerator containing galvanic sludge
One of the most effective ways to reduce power inputs to the manufacture of concrete and reinforced concrete products is the use of hardening accelerator additives that reduce the time or lower the temperature of thermal processing. From economic and ecological points of view it is expedient to use the by-products and waste industry for the production of additives. 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. As galvanic sludge is a fine product, it is more effectively used in conjunction with superplasticizer, resulting in a complex chemical additive. Application of such additives enables to triple the durability of the cement stone at the age of 12 hours, and to increase in two times the concrete strength at the age of 1 day of hardening. The effectiveness of additives remains constant when changing the mobility of the mixture, that allows applying it in different ways of forming concrete products.
10.5862/MCE.33.10
hardening accelerator
galvanic sludge
cement stone
concrete
strength
https://engstroy.spbstu.ru/article/2012.34.10/
10.pdf
RAR
RUS
72-78
Vasilyev
A.
MC-Bauchemie
7801686579
0000-0001-7011-8213
Barabanschikov
Yuri
Peter the Great Saint Petersburg Polytechnic University
ugb@mail.ru
Polytechnicheskay, 29
The effectiveness of setting and hardening accelerators for sprayed concrete
For evaluating the effectiveness of the admixtures by their physical-mechanical properties a model composition, containing cement, filler and superplasticizer was used. For more detailed research of hydration kinetics of the cement stone with addition of accelerators a calorimetric study of cement pastes was carried out. 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. Effectiveness of the admixtures can be arranged as follows: the most effective is the admixture Centrament Rapid 650, second place – Sigunite L-53, after that – MEYCO SA 167 and Relamiks Torkret. The effect of these admixtures in the presence of superplasticizer Muraplast FK63, that belongs to a group of polycarboxylates, slightly increased. The combined effect of accelerators and plasticizers can be connected with mutual influence on each other, this should be considered in design of the concrete mix.
10.5862/MCE.34.11
sprayed concrete
setting and hardening accelerators
period of setting
strength
heat generation
https://engstroy.spbstu.ru/article/2012.34.11/
11.pdf
RAR
RUS
79-84
Yankovsky
Leonid
Perm National Research Polytechnical University
yanekperm@yandex.ru
Application of the film-forming material for increasing concrete articles firmness in cold continental climate
According to the practice of making concrete products, which steaming was realized in thermoshaping machines, concretes of such products are notable for their defective structure. An unevenness of the thermal field in the concrete when warming-up it by contact method causes migration of free moisture, as a result, there is a process of hydraulic and thermal conductivity on which the moisture transfer under the influence of the pressure gradient in hardening concrete superimposes. Recently study on the removal of this defect by covering with film-forming materials the products’ surfaces free at worming from the formwork. In this paper specimen K-9 of a water-soluble polymer representing waste products of nitrogen is considered. 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. Such concrete’s properties like hardness, crack resistance are improved by using this technology as well as the resistance to the impact of climate.
10.5862/MCE.34.12
plasticizer
film-forming agent
concrete
cement concrete products
the impact of climate
durability
https://engstroy.spbstu.ru/article/2012.34.12/
12.pdf