Magazine of Civil Engineering, No.2(62), 2016


 MATERIALS

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Influence of mechanochemical activation on the cement hydration features

R.A. Ibragimov, S.I. Pimenov
Influence of mechanochemical activation on the cement hydration features (rus)

Nowadays along with the usage of various additives to the concrete mix, the activation of the binder is a promising method to enhance the physical and mechanical properties of the cement concrete. The given paper presents the results of the influence of a mechanochemical activation of cement slurry on the technological properties of the concrete mix according to GOST 10181-2014 and physico-mechanical properties of heavy concrete.
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Experimental-statistical models of properties of modified fiber-reinforced fine-grained concretes

T.A. Nizina, A.S. Balykov
Experimental-statistical models of properties of modified fiber-reinforced fine-grained concretes (rus)

The given papers present the results of the investigation of physico-mechanical characteristics of fiber-reinforced fine-grained concretes with polyfunctional modifying additives. The methodology of the construction of experimental-statistical models «modifying additives, dispersible fibers – property» to study density at normal humidity conditions, the limit of compressive strength and the limit of tensile strength in bending cement composites is stated
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Combined Effect of Glass Fiber and Polypropylene Fiber 
on Mechanical Properties of Self-Compacting Concrete

A.R. Taheri Fard, H. Soheli, S. Ramzani Movafagh, P. Farnood Ahmadi
Combined Effect of Glass Fiber and Polypropylene Fiber on Mechanical Properties of Self-Compacting Concrete

Self-compacting concrete is a state-of-the-art technology actively used all over the world in the construction field. This concrete, which has high performance, can be used for casting heavily reinforced sections, in places where vibrators have restricted access for compaction and when complex shapes of formwork are used.
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Strength and deformability of concrete structures reinforced with fibre-reinforced polymer bars

G.A. Gizdatullin, R.R. Khusainov, V.G. Khozin, N.M. Krasinikova
Strength and deformability of concrete structures reinforced with fibre-reinforced polymer bars (rus)

The given paper presents the results of the research on concrete constructions reinforcing by polymer composite reinforcement (FRP) instead of the steel one functioning on the elastic basis such as road slabs, slabs for chain drives and for pumping machines used at the oil fields.
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The strength of the polymer composite (fiberglass) with interlaminar shear

A.A. Boldyreva, Y.A. Yarunicheva, A.V. Dernakova, I.I. Ivashov
The strength of the polymer composite (fiberglass) with interlaminar shear (rus)

Multilayered fiberglasses are the first practically used fibrous composites. The ultimate interlaminar shear strength is one of the key parameters that is necessary to calculate constructions made of laminated composites
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Improvement of shear strength design of a road structure. Part 2. Modified models to calculate the principal and shear stresses

A.S. Aleksandrov, G.V. Dolgikh, A.L. Kalinin
Improvement of shear strength design of a road structure. Part 2. Modified models to calculate the principal and shear stresses (rus)

The grounds for road pavements made of granular materials are widely used in the practice of road construction all over the world. Experimental studies of different loads have shown that an adequate stress calculation using the formulas of continuum mechanics is practically impossible.
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CALCULATIONS
The usage of integral equations hereditary theories for calculating changes of measures of the theory of damage when exposed to repeated loads

N.P. Aleksandrova, V.V. Chusow
The usage of integral equations hereditary theories for calculating changes of measures of the theory of damage when exposed to repeated loads.

The article gives an overview and analysis of the models of the damage accumulation in monolithic materials when exposed to prolonged and repeatedly applied load. The application of the principle of equivalence stress in the continuous and damage body allowed introducing into the strength criterion of Pisarenko-Lebedev and the three-parameter plasticity condition of Coulomb-Mohr the measures of the theory to accumulate damage in capacity of which the damage of Y.N. Rabotnova and the continuity of L.M. Kachanov are used.
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Combined Method of 3d Analysis for Underground Structures in View of Surrounding Infinite Homogeneous and Inhomogeneous Medium

N.V. Chernysheva, G.S. Kolosova, L.A. Rozin
Combined Method of 3d Analysis for Underground Structures in View of Surrounding Infinite Homogeneous and Inhomogeneous Medium

The application of algorithms of the finite element method (FEM) or the boundary element method (BEM) reveals some peculiar properties for a numerical solution of the three-dimensional analysis in infinite domains. Various algorithms offer to avoid such problems at the expense of combining different methods and equations. .  
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METHODS
Numerical Investigations of Notched C-Profile Compressed Members with Initial Imperfections

T.V. Nazmeeva, N.I. Vatin
Numerical Investigations of Notched C-Profile Compressed Members with Initial Imperfections

. This article contains the results of numerical investigation of compressed columns made of cold-formed notched C-profile in order to find their ultimate bearing capacity. Numerical investigations of compressed member were held in two stages: investigations of stability in elastic stage in order to define the prevalent form of buckling and the corresponding value of buckling force; investigations of member postcritical behavior in non-linear position with due consideration of physical and geometrical nonlinearity as well as initial imperfections in order to discover the factors influencing bearing capacity.
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Development of methodology for time management of construction projects

S.V. Bovteev, S.V. Kanyukova
Development of methodology for time management of construction projects

This article dwells upon the issues of providing the timely completion of a project as well as key project milestones. Missing project deadlines often results in catastrophic outcomes related to the aims and results of a project. Thus, the present article deals with the relevant issues of project schedule management, a research methodology based on the application of the Schedule Timeliness Index and the Schedule Progress Index, which indicate the achievement of the critical value of extreme deviations from the targeted total project duration at any moment of time.
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