Magazine of Civil Engineering, No.7(59), 2015
Building materials and products. Technology and organization of construction
for this year
A.S. Aleksandrov, A.L. Kalinin
The article presents the Mohr – Coulomb plasticity
condition modified by incorporating a third parameter depending on sample axial deformation value for which sliding
planes are formed and developed under triaxial compression. A relative
characteristic of a sample’s work under shear strength is offered; it is determined
by the ratio of the axial strain 1 to the ultimate strain 1с for which the
parameters of the Mohr – Coulomb failure envelope are defined.
The urgency of the problem of providing people in CIS countries with
quality, affordable housing with minimal risk of implementation of housing
projects is obvious. To solve this problem, the authors proposed to review the
principles of managing investment and construction housing projects based on
project management tools, stakeholder theory and evolutionary theory of values.
It is necessary to shift the focus from maximizing profits of construction
companies to increasing the satisfaction with the significant social housing projects for all of their stakeholders.
N.M. Morozov, N.M. Krasinikova, I.V. Borovskikh
The behavior of
constructions under actual operating conditions is affected by exposure to the
environment. It is important that concrete roads and airport pavings are
resistant not only to mechanical damage, but also to the effects of alternate
freezing and thawing. The causes of early failure in concrete have been shown
using prefabricated road slabs as an example. The causes of loss of
performance properties of the roadway have been established, which are
primarily dependent on the quality of raw materials in the concrete.
V.V. Babkov, R.A. Yumagulov, R.S. Kildibaev
Precast concrete road slabs
are used for auto-road construction in the severe hydrogeologic and climatic
conditions of Western Siberia. The advantages of precast concrete road
pavements have been proved by more than half a century of use, which is confirmed
by the current steady demand for this type of product. The problem of
developing the precast concrete road system in the Western Siberian and the Far
North regions is therefore still a critical task.
A.A. Volkova, A.V. Paykov, O.N. Stolyarov, S.G. Semenov, B.E. Melnikov
In this paper the structure and properties of
textile-reinforced concrete were investigated. Two types of high strength
reinforcing fabrics made of glass and carbon rovings were used in this study.
The samples of textile-reinforced concrete were produced. The mechanical
properties of the developed samples were determined via a three-point bending
test. The maximum flexural strength and reinforcement
efficiency were calculated.
While parquet blocks and panels from stabilized
wood show much promise as finishing materials, their widespread use is limited by
their low dimensional stability in variable-humidity environments. Existing
solutions to stabilize the blocks have several disadvantages, including hard-to-find
or toxic stabilizers. This is why this study discusses modifications of epoxy
resin which has sufficient functionality for effective structuring.
A.R. Gaifullin, R.Z. Rakhimov, N.R. Rakhimova
The introduction of mineral additives to binders, especially to Portland
cement, is one of the promising trends for solving the resource and energy
saving problems, as well as problems of environmental protection during
production and application. Expanding the supplementary cementitious materials
resource base can be achieved through the use of natural pozzolans and
thermally activated polymineral clays (commonly known as glinites in Russia).
S.M. Auta, A.J. Shiwua, T.Y. Tsado
A study of compressive strength of concrete with
millet husk ash (MHA) as partial replacement for ordinary Portland cement (OPC)
is presented. The strength characteristics was investigated by casting and
testing 54 specimen cubes sizing 100 mm x 100 mm x 100 mm for
varied percentage replacements of cement (0 %, 10 % and 20 %) with water cement ratio of 0.65. These cubes
were cured for 7 days, 14 days, 28 days and 35 days to target strength design
of 25 N/mm2 at 35 days crushing.