Vol 4, No 5 (2016)
- Year: 2016
- Published: 05.04.2016
- Articles: 10
- URL: https://ogarev-online.ru/2311-2468/issue/view/18598
Full Issue
Study of the effect of phosphoric acid on cement stone with zeolite-containing fillers
Abstract
The authors study the potential for use of local raw materials – zeolite-containing rocks of the Republic of Mordovia as a filler for concrete mixtures. The effect of phosphoric acid on the filled cement binder is considered. The study presents an analysis of change dependency of the strength characteristics on the degree of filling with the zeolite rock and concentration of corrosive environment.
The influence of structural parameters and stress on the creep of cement composites
Abstract
The influence of structural parameters and stress on the creep of cement composites with joint action of compressive stresses and aggressive conditions is studied. Considering the averaged rheological material parameters, an equation of the creep of cement composites is suggested. A formula of degradation stiffness function, depending on the speed of fluid transfer in the sample under the action of compressive stresses and chemical interaction with aggressive environment, is presented.
Developing design and technological knowledge among students of architecture
Abstract
The authors consider some issues of developing design and technological competences among students of architecture. At present an architect should be trained both in design and technology at the level of semantic relations and engineering concepts. The best way to implement such an approach to design is the use of automated systems. Some examples of student constructive schemes of buildings performed in the program ArchiCAD are presented.
Listing of net dome construction with software autodesk Autocad 2015
Abstract
The design and technological forming of spherical shells based on triangular network are considered. The authors developed a design method of triangular network construction, which have been called "Traneran". The network optimal criteria are the minimum number of standard structural components and the minimum number of dome components as well as pre- assembly and pre-tension options.
New wall thermal insulation construction
Abstract
The article presents an analysis of heat-insulating walling. The advantages and disadvantages of the known utility models are considered. The advantages of evacuated insulation panels and their use are demonstrated. The technology of new enclosing wall panel manufacturing is presented.
Effective additives for raw cement mixtures based on natural zeolite-containing rocks of Mordovia republic
Abstract
The article presents the results of studies of the effective additives for raw cement mixtures based on natural zeolite-containing rocks of the Republic of Mordovia. The authors have proved the possibility of obtaining an additive, based on Atyashevsky field of Mordovia, which will significantly intensify the hydration of cement during its introduction into raw mixtures, reduce the time of heat and humidity treatment of compositions based on them, significantly increase the strength of the composites in the later stages of hardening.
Study of water demand of modified fiber-reinforced concrete mixture and its effect on physical and mechanical characteristics of fine-grained concretes
Abstract
The effect of water demand of fiber concrete mixtures on the physical and mechanical properties of modified disperse-reinforced fine-grained concretes is studied. A graphical interpretation of the study results was carried out on Gibbs-Roseboom triangular diagrams constructed with the use of Statistica 10.0.1011. The optimal additive complexes and dispersed fibers are analyzed in order to improve the cement composites characteristics.
Analysis of influence of functionally graded polymer coatings thickness on the distribution of filler particles
Abstract
The article presents the results of modeling of constrained sedimentation of the filler particles in the functionally graded coatings of varying thickness. We used software package that allows to simulate the process of constrained sedimentation of polydisperse suspension in the process of polymer systems curing depending on the size and density of the filler particles, the degree of filling and changing of binder viscosity. The authors have revealed changes in the thickness of layers according to the degree of filling, filler ratio varying and thickness of formed coating. It is shown that the process of fractional separation is observed both in highly and lightly filled composites.
Quantitative assessment of fractal dimension of pore structure of fine-grained concretes with software "identification and analysis of porosity of construction materials"
Abstract
Basic methods of fractal analysis of construction materials are considered. It is suggested to use the method of isles cut to assess the pore structure of fine-grained concretes. It is demonstrated that the use of software "Identification and analysis of porosity of construction materials" automates quantitative measuring of the fractal dimension of the pore structure and significantly reduces the time required to receive it.
Analysis of effects of exposure duration on climatic resistance of fine-grained concretes
Abstract
The results of fine-grained concretes composition testing are presented. The effects of climatic factors on the change in temperature of the sample surfaces are defined. The effects of exposure duration in testing conditions on the change in the elastic-strength properties of fine-grained concretes are studied.