Vol 2, No S2 (2014)
- Year: 2014
- Published: 25.12.2014
- Articles: 10
- URL: https://ogarev-online.ru/2311-2468/issue/view/24143
Full Issue
Modern diagnostics of technical condition of building structures
Abstract
The article analyzes the main methods of diagnostics of technical condition of building structures. By testing reinforced concrete building structures, the authors carried out a comparative analysis of different methods of determining the quantitative characteristics of technical condition of building structures.
2-7
The effects of nanomodifying additives on technological and operational characteristics of cement concretes
Abstract
The article presents the study results of the effects of modified nanoadditive polycarboxylate plasticizer Melflux 1641 F on the rheological and strength characteristics of cement concrete. The study showed that the concrete mixture brand could be improved on its workability by means of the proposed modification method without the compressive strength reduction. The study demonstrated a reduction of the expensive polycarboxylate plasticizer Melflux 1641 F consumption due to its modification by the additive ANKU 2. Depending on the requirements to the mobility of concrete mixtures, the consumption of plasticizer could be reduced from 19 to 43%, with the largest savings of Melflux 1641 F observed in mixtures of highly mobile brand P5.
8-13
Effective fine concretes on sands of Voyevodskoye and Usklyayskoye deposits of Mordovia Republic
Abstract
The article presents the study results of developing fine-grained concretes on the sands of Usklyayskoye and Voyevodskoye deposits of Mordovia Republic. The study demonstrates the process of obtaining B20 class fine-grained concretes based on the sands of Usklyayskoye deposit. Consequently, the filler holds much promise for the cement concrete production.
14-18
A study of the effect of organic acids on the filled cement paste
Abstract
The paper presents a study of some carboxylic acids and filled cement stone interaction. The authors analyze the damages to building materials based on mineral binders in aggressive media. The study shows the formation of the structure of cement composites by introducing zeolite fillers.
19-24
The results of field tests of polymeric composite materials based on epoxy binders
Abstract
The article presents the results of epoxy composites field tests. The study revealed the parameters that have the greatest impact on the decorative characteristics of polymeric composites. The influence of aggressive factors on the color saturation of epoxy resins was also studied.
25-31
Buckling method for determining mechanical characteristics and properties of composite rebar
Abstract
This article presents the experimental values of the mechanical characteristics and properties of fiberglass rebars. The authors studied the work of rebars under the action of aggressive media and different temperature regimes. It was found that the optimum length for determining the mechanical properties of fiberglass rebar by using the buckling method are samples of 210 mm. When the temperature increases, rebar becomes more ductile, elastic modulus and strength of reinforcement significantly reduce.
32-38
Vacuum insulated panels based on modified diatomite
Abstract
The article presents the results of a comparative analytical test of the amorphous silica fume powder based on Atemar diatomite and a foreign filling powder. In this connection, vacuum isolation panel test samples have been produced, their heat transmittance measured. The study has proved the possibility to use local minerals for vacuum insulated panel production. Keywords: vacuum insulated panel, amorphous silica fume, diatomite.
39-46
Polymer-impregnated concrete based on cement concrete with mineral filler
Abstract
The article discusses polymer impregnation of concrete to protect it from weather and corrosive influences. This is one of the ways of the modern industry of building materials, which enhances their durability and has a considerable economic effect.
47-53
Practical application of methods of designing elements based on functionally gradient composite materials
Abstract
The article considers the basic principles of calculation of functionally gradient composite materials. Particularly, the study deals with forecasting the properties of porous impregnated epoxy composite cement composite made by the method of calculation of functionally gradient materials.
54-59
Experimental studies of polymer composites based on low-viscosity epoxy binders
Abstract
The article present the results of experimental studies of the influence of active diluent Etal-1 on the rheological and elastic-strength properties of epoxy composites. By using the reverse torsion pendulum, the authors studied the temperature dependence of the dynamic shear modulus, loss modulus and mechanical loss tangent of epoxy composites. It was found that the results obtained from the analysis of the temperature dependence of the dynamic shear modulus and loss modulus results show the same characteristic temperature of a-transition, which should be regarded as the glass transition temperature of polymer composite.
60-68