Magazine of Civil Engineering, No.2(54), 2015
Building materials and units. Technology and
organization of construction.
for this half-year
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K.A. Chernyi, G.Z. Fainburg
The technological boom of the building industry has
resulted in a practically unlimited diversity of new materials. Various
contaminants often emanate from these building materials in the indoor
environment. As a result, the indoor and outdoor air quality becomes more
diverged. The known way to keep qualitative, up to curative indoor air is to
use of materials from sawn, pressed, melded structures (blocks and plates) from
S.A. Koshkarev, V.N. Azarov
This paper describes a way of reducing pollutant
dust emissions exhausted in the atmosphere when manufacturing expanded clay by
applying high effective wet dust cleaners with a combined scheme of dust
separation from the gas flow within dust aspiration systems. Brief description of technological processes and
devices and related major sources of emissions and discharges of pollutants
into the atmosphere in the expanded clay’s producing is provided.
M.O. Dudin, N.I. Vatin, Yu.G. Barabanshchikov
Monolithic construction in winter faces problems of
developing concrete strength at the negative ambient temperature. In order to
provide the required temperature conditions for concrete curing and hardening
builders use different methods to warm structures. One way is to use heating wire.
The relevance of the paper is due to the climatic
conditions of construction in most parts of Russia and the lack of a uniform
methodology for calculating the required output of warm by heating wire.
A.B. Krutilin, Y.A. Rykhlionak, V.V. Liashkevich
The paper presents the results of experimental
studies of thermophysical characteristics of autoclaved aerated concrete with
density of 400 and 500 kg/m3. The dependence of thermal conductivity on
temperature and humidity was determined. The boundary humidities were set for
which ice is either not formed or its amount is negligible in the pores of the
materials at the temperature below zero.
A.B. Steshenko, A.I. Kudyakov
Cement based foam concrete of natural aging
experiences high shrinkage of foam concrete mix in the formwork and shrinkage
strain when drying. When managing the microstructure of the composite, namely
the change (acceleration) of the microstructure formation and reinforcement of
the cement stone, significant decrease can be achieved in the values of
R.A. Ibragimov, S.I. Pimenov, V.S. Izotov
This paper presents the effect of mechanochemical
activation of on the physico-mechanical properties of fine-grained concrete.
The optimal time of mechanical activation of cement slurry was defined, at
which the maximum increase in the compressive strength of fine-grained concrete
was achieved. The quantity of Portland cement activated by its
total weight in the composition slurries was experimentally established.
A.M. Kirillov, M.A. Zavialov
Historically, since the 1930s, deformation and
power criteria were defined by methods of calculation of non-rigid road clothes
(the deformation modulus, the California bearing ratio, the dynamic modulus).
For almost a centenary history considerable statistical changes of the
specified indicators in road layers were collected. However, the physical essence of these changes and
their regularity still remain unknown.
A.V. Karelskiy, T.P. Zhuravleva, B.V. Labudin
The results of a bending test of wood composite
beams connected by gang nail are presented in this paper. Two types of wood
composite beams fracture were observed: brittle and ductile. In addition, a numerical model of wood composite
beams was produced and the results of the numerical investigations were
analyzed. Compliance of connection «gang nail – wood» was considered by means
of input elements with a reduced modulus of elasticity in the numerical model.
The author analyses modern technologies and
equipment used for producing and installing metalwork and also some types of
structures. Therefore, additional reserves of increase in technological effectiveness
were due to the selection of the optimal geometrical form, improvement of
separate parts of the structure, values of separate design data for certain
V.A. Penchuk, V.K. Rudnev, N.V. Saenko, V.N. Suponev, V.I. Oleksyn, S.P. Balesniy, S.M. Vivchar
The combined method of horizontal wells development
by a soil thrust boring plant of static action with cutting rings has been
proposed. The ratio between the diameters of the cutting ring
and horizontal well has been determined. The regression equation was received to determine a minimum depth of a
horizontal well laying depending on the diameter of the bore hole and soil