scholarly journals STUDY OF JOINT INFLUENCE OF PLASTER COATINGS AND FACADE PAINTS ON HUMIDITY IN GAS CONCRETE WALLS

2021 ◽  
Vol 6 (3) ◽  
pp. 19-26
Author(s):  
V. Loganina ◽  
M. Frolov
Keyword(s):  
High Temperatures ◽  
Combined Effect ◽  
Vapor Permeability ◽  
Concrete Walls ◽  
Joint Influence ◽  
Moisture Condensation ◽  
Aerated Concrete

The article presents the results of a study of the combined effect of plaster coatings and facade paints on the humidity regime in the walls made of aerated concrete brands D400 and D600. The influence of the characteristics of paints and plaster coatings on the temperature of the beginning of condensation is estimated. The position of the planes in which condensate begins to precipitate for all the structures under consideration is determined. It is found that in enclosing structures using cement-slag plaster, the temperature of the beginning of condensation is higher than the temperature of the beginning of condensation in enclosures in which cement-vermiculite plaster is used. When using VAK "Silicate" and VAK "Silicon 2" facade paints, which are distinguished by the highest vapor permeability, this difference is maximal and amounts to 2 C and 2.3 C, respectively. When using VAK "Tsokol" and VAK "Acryl 1" facade paints, this difference is minimal and amounts to 0.2 C and 0.5 C, respectively. It has been established that when using cement-slag plaster and paints VAK "Tsokol", VAK "Acryl 1", VAK "Acryl 2", VAK "Silicone 1", VAK "Silicone 2", moisture condensation occurs at the border of aerated concrete-external finish, which creates the danger of detachment of the plaster composition from aerated concrete. These structures are also characterized by rather high temperatures of the onset of condensation from -5.4 °C and above. When using VAK "Silicate" paint and cement-slag plaster, moisture condensation begins in the thickness of aerated concrete, which is more favorable for the enclosing structure. Recommendations are given on the choice of the type of paint and the type of plaster composition for walls made of aerated concrete grades D400, D600.

scholarly journals Influence of Fabric Weave on Thermal Radiation Resistance and Water Vapor Permeability

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 525
Author(s):  
Ana Kiš ◽  
Snježana Brnada ◽  
Stana Kovačević
Keyword(s):  
High Temperatures ◽  
High Performance ◽  
Thermal Protection ◽  
Water Vapor Permeability ◽  
Radiant Heat ◽  
The Body ◽  
Vapor Permeability ◽  
Weave Structure ◽  
Fabric Structures ◽  
The Impact

In this work, aramid fibers were used to develop new, high-performance fabrics for high-temperature protective clothing. The research was based on the impact of the weave structure on fabric resistance to radiant heat. The goals of the research were primarily related to the development of new fabric structures created by the weave structure, which gives better protection of the body against high temperatures in relation to the standard weave structures that are used today. According to the results obtained it can be concluded that the fabric weave significantly affects the fabric structure, which consequently determines the effectiveness of protection against high temperatures. The justification for the use of multi-weft and strucks weave structure, which provides greater thermal protection and satisfactory breathability than commonly used weave structures, was ascertained.

scholarly journals Study of the structure and characteristics of autoclaved aerated concrete

2020 ◽  
pp. 23-32
Author(s):  
Veronika Aleksandrovna Alipova
Keyword(s):  
Building Material ◽  
Coefficient Of Thermal Expansion ◽  
Weight Ratio ◽  
Strength Properties ◽  
Sound Insulation ◽  
Vapor Permeability ◽  
Conventional Concrete ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Manufacturing Technologies

The lightweight and porous building material has many advantages over conventional concrete, such as a higher strength-to-weight ratio, a lower coefficient of thermal expansion and good sound insulation. This article focuses on the historical periodization of the development of autoclaved aerated concrete and a literature review that focuses on the influence of porosity, vapor permeability and strength properties of a given building material. The subject of this research is the analysis of the key historical events and manufacturing technologies that influenced the creation and transformation of the structural components of autoclaved aerated concrete. In the course of research, the author revealed that although aerated concrete is a new material in construction, it appeared a long time ago. Initially, five thousand years ago, this composition of the material was used as a plaster and brickwork mortar; showing a positive effect in construction, the aerated concrete over the years took the form of a cellular block, and its characteristics continue to be discovered. The properties, composition and structure of autoclaved aerated concrete are being improved through its composition and geometry of the shape of block, which contributed to environmental friendliness of the new building material, its durability, and creation of comfortable living conditions for people. However, the material requires new rational manufacturing technologies are needed in order to improve its quality and characteristics.

THE USE OF FLY ASH ALUMINOSILICATE MICROSPHERES IN THE LIME DRY MIXES FOR FINISHING AERATED CONCRETE

2017 ◽  
Vol 2 (3) ◽  
pp. 6-8 ◽  
Author(s):  
Логанина ◽  
Valentina Loganina ◽  
Фролов ◽  
Mikhail Frolov
Keyword(s):  
Thermal Conductivity ◽  
Water Vapor ◽  
Fly Ash ◽  
Water Vapor Permeability ◽  
High Water ◽  
Vapor Permeability ◽  
Low Thermal Conductivity ◽  
Aerated Concrete ◽  
Sufficient Strength

The application of ash microspheres in lime dry construction mixtures, designed for finishing aerated. It is shown that on the basis of dry ash mixtures with microspheres characterized by coating a sufficient strength, low thermal conductivity, high water vapor permeability, resistance to the action of the slanting rain.

An experimental study on the effect of frame-to-wall connection type on the seismic behavior of steel frames infilled with autoclave-cured aerated concrete blocks

2019 ◽  
Vol 23 (4) ◽  
pp. 642-656
Author(s):  
Saheb Ali Asadzadeh ◽  
Majid Mohammadi ◽  
Nader Khajeh Ahmad Attari ◽  
Seyed Alireza Zareei
Keyword(s):  
Experimental Study ◽  
Steel Frames ◽  
Concrete Walls ◽  
Strength Deterioration ◽  
Drift Ratio ◽  
Concrete Blocks ◽  
Aerated Concrete ◽  
Connection Type ◽  
Frame Stiffness ◽  
Level Performance

In this article, in order to find some reliable connection types for avoiding the infill failure, an experimental study is conducted on six half-scale single-story single-bay specimens, including one bare frame and five steel frames with autoclave-cured aerated concrete walls, each having different frame-to-wall connection types. Polyurethane adhesive was used in bed joints of the autoclave-cured aerated concrete walls as a mortar. The specimens were tested under displacement-controlled loading to examine their effect on the in-plane behavior of steel frames. The results suggested that V- and T-shaped connectors can be used as prequalified connectors between the wall and the frame. In specimens with these connectors, the interaction between infill and frame was ignorable and the infill remained intact up to life safety performance level (2.5% drift ratio). Furthermore, the application of these connectors resulted in a two-level performance of the infill whereby the frame stiffness degradation and strength deterioration after the drift ratio of 2.5% was compensated.

scholarly journals Morphological changes of the rats pancreas after the joint influence of the dosed normobaric hypoxia and melatonin

2018 ◽  
Vol 76 (2) ◽  
pp. 47-50
Author(s):  
R. Yanko
Keyword(s):  
Morphological Changes ◽  
Standard Procedure ◽  
Normobaric Hypoxia ◽  
Combined Effect ◽  
Male Rats ◽  
Exocrine Function ◽  
Structural Adaptation ◽  
Experimental Animals ◽  
Large Size ◽  
Joint Influence

The aim of the study was to investigate the morphological changes in the rat's pancreas after the combined effect of dosed normobaric hypoxia (DNG) and melatonin. The study was carried out in the spring on 24 male rats of the Wistar line. The experimental animals were daily given a hypoxic gas mixture (12 % oxygen in nitrogen) in a intermittent mode: 15 minutes deoxygenation / 15 minutes reoxygenation for 2 hours. The same rats were daily administered orally with exogenous melatonin at 10.00 at a dose of 5 mg/kg. The duration of the experiment was 28 days. From the pancreas tissue, histological preparations were prepared according to a standard procedure. The morphometry was performed using the computer program "Image J". For the first time it was revealed that the 28-day combined effect of DNG and melatonin results in an increase in the size of the acinus, exocrine cells, epithelial height, and nucleolus hyperplasia in the pancreas. The change in these parameters may indicate activation of the exocrine function of the gland. The effect of intermittent hypoxia and melatonin also increase (to an insignificant extent) the activity of the endocrine part of the pancreas. This is evidenced by the large size of the Langerhans islets and the number of endocrinocytes placed in them. In the experimental animals was noted a decrease in the thickness of the interlobular and interacinus interlayers connective tissue, which can be considered as a manifestation of the mechanism of structural adaptation, which facilitates the transport of oxygen and nutrients to the parenchymal elements of the gland. The combined effect of DNG and melatonin has morphological signs of increased activity of exocrine and endocrine (to a lesser extent) parts of the pancreas.

scholarly journals The sustainable energy approach in the manufacture of cellular concrete

2019 ◽  
Vol 91 ◽  
pp. 02024 ◽  
Author(s):  
Ruben Kazaryan ◽  
Konstantin Belyaev
Keyword(s):  
Environmental Planning ◽  
Single Layer ◽  
Mineralogical Composition ◽  
Treatment Method ◽  
Strength Properties ◽  
Vapor Permeability ◽  
Treatment Changes ◽  
Aerated Concrete ◽  
Moisture Conditions ◽  
Cellular Concrete

Cellular concrete holds one of the leading places in world practice of construction as a structural heat insulating material used in the construction and reconstruction of buildings and structures for various purposes. Excessive (reserve) porosity of cellular concrete provides its frost resistance (compensates expansion of water when freezing and the formed ice without destroying the material). Vapor permeability of cellular concrete provides fast removal of technological moisture from the material and the maintenance of normal moisture conditions in the rooms, and rather high air permeability contributes to the preservation of fresh air in the rooms. Thermal insulation and strength properties of cellular concrete allow erecting single-layer enclosing structures with the required thermal resistance from it. Cellular concretes are divided into aerated concrete and foam concrete, the operating, physical and mechanical parameters of which are almost the same with all other things being equal. According to the hydrothermal treatment method, cellular concrete is divided into two groups: autoclaved and non-autoclaved concrete (air hardening or steaming). The qualities of such concretes differ significantly, since autoclave treatment changes the mineralogical composition of concrete, which greatly affects the profitability of energy-related technological processes associated with the environment and ultimately forms the basis of environmental planning and management.

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