Magazine of Civil Engineering, №8(34), 2012
Builduing materials and articles. Building envelope
for this half-year
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The research presents
the calculations for the heat losses through the envelope of the
building. The calculations are provided for different levels of
enclosing structures (i.e. wall, windows, roof etc) according to three
normative documents: Set of rules 50.13330.2012 (rus), Construction
Regulations 23-02-2003 (rus) and National Building Code of Finland,
For the qualitative risk assessment of the
operational properties reduction for plaster layers of walling, in this
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
stand for facades trials.
Results of quantitative estimation of stresses
in the plaster layers on surfaces of different stiffness due to the
shrinkage are given. It is shown that with a decrease of the surface
elasticity, stresses in the plaster coating are decreased either due to
reduction of the effect of its deformations’ constraint.
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
expanded clay, carbonate, perlite and other fillers was also developed.
Possibility of application of mixed-layer clays of the Penza region as
structuring additive in lime dry mixes is considered. It is indicated
that introduction of the clay burned at temperature of
number 10% from mass of a lime promotes durability increase in
is 17,85-63%, as a function of technology, temperature of
baking and a type of clay.
I. V. Ageyev,
A. A. Kozeyev,
M. Ye. Yudovich
The article contains
experimental data on new French giperplasticizer PREMIA 360 and the
how to increase its effectiveness. Also the results of
modification PREMIA 360 by the water-soluble adducts of carbon
(Astralenes C) together with a new pozzolanic additive - ash shale
are presented and discussed.
The testing results and
physicotechnical properties of next generation concretes with low
consumption of cement per unit of strength are given. It is shown that
generation concretes can be not only high strength and super-high
ones, but also general purpose concretes with the strength performance
V15–V40 with specific cement consumption per unit of
compression strength equal
to 3–5 kg/MPa.
The purpose of the present work is developing
requirements for the chemical modifiers defining their suitability in
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
concrete formation. Use of engine oil 5W-50 is not effective because of
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In this paper we propose the use of galvanic
sludge, which structure contains oxide, hydroxide and aluminum
use leads to an increase in the strength of cement stone in the first
days of hardening, as the number of Ettringite
increases in the system.
This study found that alkali-free setting and
hardening accelerators for sprayed concrete, based on aluminum
added in cement paste after 20 minutes after preparation, provide a
in heat generation and temperature, and significantly accelerate the
and hardening of cement paste.
Results of natural experiments devoted to exploring
the influence of film-forming agent on durability of cement concrete
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
mechanism with the subsequent protection of concrete.