scholarly journals Influence of hydrophilic polymers based on polyvinyl alcohol and starch on physiсo-mechanical properties of thermal insulation materials

2020 ◽  
pp. 32-38
Author(s):  
Perizat Urkimbaeva ◽  
Bauyrzhan Bakytzhanuly ◽  
Yesen Dilmukhambetov ◽  
Alua Mamutova ◽  
Zarina Kenessova
Keyword(s):  
Thermal Conductivity ◽  
Polyvinyl Alcohol ◽  
Linear Shrinkage ◽  
Natural Polymers ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Coefficient Of Thermal Conductivity ◽  
Almost All ◽  
Positive Effect ◽  
Synthetic And Natural Polymers

Thermal insulating materials based on diatomite with burnable and reinforcing additives modified with synthetic and natural polymers have been developed. A mixture of polyvinyl alcohol and starch was used as modifying polymers. The parameters of linear shrinkage, density, tensile strengths in compression and bending, as well as the coefficient of thermal conductivity of the material were determined depending on the concentration and ratio of polymers. It was established that polymer additives had a positive effect on almost all specified characteristics of thermal insulating materials. For example, when adding polymers up to 1 mass.%, the linear shrinkage coefficients decrease from 14.5 to 4.5%, the ultimate compression strengths increase from 0.22 to 2.51 MPa, the ultimate bending strengths increase from 0.2 to 1.26 MPa, the coefficients of thermal conductivity decrease from 0.068 to 0.049 W/m∙K. The densities of materials are in the range of 0.592-0.491 g/cm3. The results of the work showed that the obtained heat-insulating materials can be used as plasticizers in the field of thermal energy.

scholarly journals MINERAL WOOL COMPOSITE WITH THE USE OF SAPONITE-CONTAINING MINING INDUSTRY WASTE

2020 ◽  
Vol 3 (3) ◽  
pp. 21-27 ◽  
Author(s):  
T. Drozdyuk ◽  
Arkadiy Ayzenshtadt ◽  
M. Frolova ◽  
Rama Shanker Rama Shanker Verma
Keyword(s):  
Thermal Conductivity ◽  
Compressive Strength ◽  
Thermal Insulation ◽  
Mining Industry ◽  
Basalt Fiber ◽  
Linear Increase ◽  
Mineral Wool ◽  
Basalt Fibers ◽  
Thermal Insulating ◽  
Coefficient Of Thermal Conductivity

the paper shows the possibility of producing a thermal insulating composite based on basalt fibers and sapo-nite-containing mining waste. A method for manufacturing thermal insulating composites from hydro-mass with different contents of the mixture components is proposed. Basalt fibers were used as a filler, and pre-mechanoactivated saponite-containing material (SCM) was used as a binder. It was found experimentally that depending on the composition of composites, the coefficient of thermal conductivity varies from 0.1109 to 0.1342 W/(m•K), and the compressive strength – from 0.45 to 0.93 MPa. In addition, it was found that thermal modification of composites at temperatures up to 1200°C significantly (up to 3 times) increases the compressive strength of composites, while not affecting the coefficient of thermal conductivity. The ex-periments to determine the conductivity of the composite “basalt fiber – SСM” depending on its moisture content showed that the obtained composite is characterized by intense and linear increase in the values of conductivity when the humidity of the sample to 12% and further increase in humidity practically does not change the values of the coefficient of thermal conductivity. Comparison of the studied thermal insulation composite with known structural thermal insulation materials in terms of its thermal insulation and strength characteristics showed that it is comparable to gas and foam blocks. It should also be noted that this material is environmentally safe and can withstand high temperatures without collapsing.

scholarly journals Effect of additive polyvinyl alcohol polymer on properties of cement – Silica

2011 ◽  
Vol 8 (2) ◽  
pp. 435-438
Author(s):  
Baghdad Science Journal
Keyword(s):  
Thermal Conductivity ◽  
Polyvinyl Alcohol ◽  
Water Absorption ◽  
Silica Composite ◽  
Thermal Insulating ◽  
Effect Of Additives ◽  
Compression Resistance

Study the effect of additives polymer polyvinyl alcohol (PVA) after solving in water by concentration 10% since represent a standard of PVA solution with added to cement – silica composite of ratio (1:2) with 5%, 10%, 15%, 20%, and 25% respectively to the standard quantity of water which using as a mortar of building. The results are demonstrate increasing on compression resistance with increase of PVA solution until 20%, and decreasing of thermal conductivity which represent a composite are increasing in thermal insulating. The results were recommended decreasing of water absorption with increase of PVA solution ratio as illustrated in this study.

The Preparation and Performance Study of Thermal Insulating Materials with Diatomite

2014 ◽  
Vol 941-944 ◽  
pp. 1562-1565 ◽  
Author(s):  
Jing Da ◽  
Yu Hui Du ◽  
Mao Dong Li ◽  
Cun Bao Zhang
Keyword(s):  
Compressive Strength ◽  
Performance Study ◽  
Growth Trend ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Opposite Trend ◽  
Coefficient Of Thermal Conductivity ◽  
And Performance ◽  
Activating Solution ◽  
Main Material

Diatomite was used as the main material and sodium silicate as the alkali activating solution in this paper. Diatomite light-weigh material was made by chemical foaming method. Compressive strength, density and heat conductivity were used to measure its performances. Results showed that density, compressive strength showed a growth trend while coefficient of thermal conductivity showed the opposite trend with increasing rapid hardening cement and senior gypsum.

The Use of Sapropel in Development of Effective Thermal Insulating Materials

2014 ◽  
Vol 604 ◽  
pp. 313-316 ◽  
Author(s):  
Giedrius Balčiūnas ◽  
Jadvyga Žvironaitė ◽  
Sigitas Vėjelis
Keyword(s):  
Thermal Conductivity ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Compressive Stress ◽  
Processing Industry ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Production Wastes ◽  
Composite Forming ◽  
Composite Microstructure

This paper presents investigations of thermal conductivity, tensile strength and compressive stress at 10% deformation of effective thermal insulation composites made from hemp shives and sapropel. Images of hemp shives and hemp composite microstructure obtained by scaning electron microscope (SEM) are analised. The paper presents properties of composite from seven compositions. Composite forming mixture contains different amount of sapropel as well as paper production wastes (PPW) obtained in paper processing industry.

Evaluation of Structure Influence on Thermal Conductivity of Thermal Insulating Materials from Renewable Resources

1970 ◽  
Vol 17 (2) ◽  
pp. 208-212 ◽  
Author(s):  
Jolanta VĖJELIENĖ ◽  
Albinas GAILIUS ◽  
Sigitas VĖJELIS ◽  
Saulius VAITKUS ◽  
Giedrius BALČIŪNAS
Keyword(s):  
Thermal Conductivity ◽  
Thermal Insulation ◽  
Renewable Resources ◽  
Raw Materials ◽  
Raw Material ◽  
Barley Straw ◽  
Insulation Material ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Thermal Insulating

The development of new thermal insulation materials needs to evaluate properties and structure of raw material, technological factors that make influence on the thermal conductivity of material. One of the most promising raw materials for production of insulation material is straw. The use of natural fibres in insulation is closely linked to the ecological building sector, where selection of materials is based on factors including recyclable, renewable raw materials and low resource production techniques In current work results of research on structure and thermal conductivity of renewable resources for production thermal insulating materials are presented. Due to the high abundance of renewable resources and a good its structure as raw material for thermal insulation materials barley straw, reeds, cattails and bent grass stalks are used. Macro- and micro structure analysis of these substances is performed. Straw bales of these materials are used for determining thermal conductivity. It was found that the macrostructure has the greatest effect on thermal conductivity of materials. Thermal conductivity of material is determined by the formation of a bale due to the large amount of pores among the stalks of the plant, inside the stalk and inside the stalk wall.http://dx.doi.org/10.5755/j01.ms.17.2.494

Comparison of the Thermal Properties of Different Insulating Materials

2014 ◽  
Vol 899 ◽  
pp. 381-386 ◽  
Author(s):  
Akos Lakatos
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Material Constant ◽  
Mineral Wool ◽  
Expanded Polystyrene ◽  
Point Of View ◽  
Building Structures ◽  
Transfer Coefficients ◽  
Insulating Materials ◽  
Thermal Insulating

Currently thermal insulating of the buildings is sorely needed from the point of view of energy as well as money savings. It is important to highlight that the most commonly used insulation materials in the building sector are the expanded polystyrene (EPS), the extruded polystyrene (XPS) and the fibrous (mineral, rock) ones. In this communication we confront 6 different insulating materials slabs (EPS 30, 100, 150, 200, a yellow XPS and a mineral wool by their thermal properties. Therefore two types of hypothetic building structures were created and they were insulated with the above presented materials from 0.01 m to 0.3 m thicknesses. For the calculations the thermal conductivity of each sample was determined using a Holometrix 2000 (HLS) heat flow meter. As a result their heat transfer coefficients, delaying abilities, energy storing capabilities and thermal diffusion coefficients were confronted. Besides a material constant had been defined and was paired with the measured thermal conductivity.

Configuration and Pyrological Performance of Self Thermal Insulating Blocks

2011 ◽  
Vol 250-253 ◽  
pp. 668-672
Author(s):  
Xin Wei Ma ◽  
Li Xiong Yang ◽  
Yu Yan Ji
Keyword(s):  
Thermal Conductivity ◽  
Energy Consumption ◽  
Energy Conservation ◽  
Thermal Resistance ◽  
Light Weight ◽  
Insulating Materials ◽  
Thermal Insulating ◽  
Concrete Shell ◽  
And Performance ◽  
Good Heat

Energy conservation is a hot topic in the field of construction. To increase the thermal resistance of the enclosing structure of buildings, a T-shaped self thermal insulating block is designed. The particular shape, light weight concrete shell and heat insulating materials filled in the cavities result in a good heat insulating effect. Thermal bridges on the wall can significantly be reduced, which leads to a great improvement in thermal resistance, and performance of energy conservation. The thermal conductivity of wall made of this kind of blocks could be as low as 0.088W/ m·K, by which energy consumption could be saved by 65% comparing with wall made of bricks in 1980s.

Determination of Thermal Conductivity on Lightweight Concretes

2016 ◽  
Vol 677 ◽  
pp. 163-168
Author(s):  
Lenka Bodnárová ◽  
Jitka Peterková ◽  
Jiri Zach ◽  
Kateřina Sovová
Keyword(s):  
Thermal Conductivity ◽  
High Temperatures ◽  
Structural Changes ◽  
Lightweight Concrete ◽  
Thermal Insulating ◽  
Coefficient Of Thermal Conductivity ◽  
The Matrix ◽  
Wire Method ◽  
Insulating Properties

A range of testing methods were used to study the potential structural changes as a result of the effects of high temperatures on lightweight types of concrete developed above all for fire resistant structures. One such test for monitoring changes in concrete structures is the non-stationary determination of the coefficient of thermal conductivity using the hot wire method. The matrix structure progressively collapses as a result of the effects of high temperatures on the concrete structure ́s surface because erosion takes place of the matrix and aggregate porous structures. The degradation of the porosity of the concrete results in the deterioration of its thermal insulating properties. This paper assesses the dependence of the thermal conductivity coefficient of lightweight concretes on temperature and determines the potential occurrence of structural changes in the lightweight concrete matrix. The results were verified using other methods to determine the concrete ́s resistance to thermal load.

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