Heat Conductive Plates from Recycled Niobium Slag

2021 ◽  
Vol 320 ◽  
pp. 169-175
Author(s):  
Priit Kulu ◽  
Dmitri Goljandin ◽  
Mart Viljus ◽  
Rainer Traksmaa ◽  
Andre Gregor
Keyword(s):  
Thermal Properties ◽  
Building Materials ◽  
Raw Materials ◽  
Waste Product ◽  
Fine Fraction ◽  
Mechanical And Thermal Properties ◽  
Metallurgical Production ◽  
Conductive Material ◽  
Calcium Aluminates ◽  
Main Component

Niobium slag as a waste product from metallurgical production of metallic niobium, containing calcium aluminates mainly, is valuable raw materials for different new products in the building materials industry. Disintegrator milling technology for pretreatment of Nb-slag was used, consisting of following steps: a) precrushing of slag, b) separative milling for extraction of metallic Nb. The yield of metallic Nb with a purity of 90 – 95 % was about 1.0 %; mineral ballast consists mainly (about 98 %) from calcium aluminates. The potential application areas of fine fraction (less 0.3 mm) of calcium aluminates were studied a) as a component in concrete and ceramics and b) as the main component of heat conductive material. The technology, mechanical and thermal properties (strength, thermal conductivity and expansion) of materials were studied. As reference material analogous CPA commercial thermal plates (Cebud, Poland) were studied. In the result of studies of mechanical and thermal properties of calcium aluminate based materials, it was demonstrated that the application of them as heat conductive material is more prospective.

Mechanical and Thermal Properties of Magnesia Binder Based on Natural and Technogenic Raw Materials

2021 ◽  
Vol 320 ◽  
pp. 181-185
Author(s):  
Elvija Namsone ◽  
Genadijs Sahmenko ◽  
Irina Shvetsova ◽  
Aleksandrs Korjakins
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Raw Materials ◽  
High Strength ◽  
Strength Properties ◽  
Waste Materials ◽  
Mechanical And Thermal Properties ◽  
Experimental Part ◽  
Technogenic Raw Materials ◽  
Caustic Magnesia

Because of low calcination temperature, magnesia binders are attributed as low-CO2 emission materials that can benefit the environment by reducing the energy consumption of building sector. Portland cement in different areas of construction can be replaced by magnesia binder which do not require autoclave treatment for hardening, it has low thermal conductivity and high strength properties. Magnesium-based materials are characterized by decorativeness and ecological compatibility.The experimental part of this research is based on the preparation of magnesia binders by adding raw materials and calcinated products and caustic magnesia. The aim of this study was to obtain low-CO2 emission and eco-friendly material using local dolomite waste materials, comparing physical, mechanical, thermal properties of magnesium binders.

Mechanical and Thermal Properties of MgAl2O4-Y3Al5O12 Ceramic Composites

2018 ◽  
Vol 281 ◽  
pp. 255-260 ◽  
Author(s):  
Jiang Bo Liu ◽  
Zhou Fu Wang ◽  
Hao Liu ◽  
Xi Tang Wang ◽  
Yan Ma
Keyword(s):  
Thermal Properties ◽  
Raw Materials ◽  
Laser Flash ◽  
Ceramic Composites ◽  
Mechanical And Thermal Properties ◽  
X Ray Diffraction ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients ◽  
Increasing Temperature ◽  
Flash Diffusivity

MgAl2O4-Y3Al5O12 ceramic composites were prepared using fused spinel and a Y2O3 micropowder as the raw materials. The microstructure and thermal properties of the composites were characterized by X-ray diffraction, scanning electron microscopy, laser flash diffusivity measurements. The mechanical properties were also determined. MgAl2O4-Y3Al5O12 ceramic composites are composed of spinel and garnet structures. The thermal expansion coefficients of MgAl2O4 and MgAl2O4-Y3Al5O12 ceramics are similar. The measured thermal diffusivity decreases gradually with increasing temperature. Thermal conductivity of the composites is in the range of 3.3-5.8 W∙m-1∙K-1 from 400°C to 900°C.

scholarly journals An Artificial Neural Network Model to Predict the Thermal Properties of Concrete Using Different Neurons and Activation Functions

2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Sehmus Fidan ◽  
Hasan Oktay ◽  
Suleyman Polat ◽  
Sarper Ozturk
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Thermal Properties ◽  
Thermal Property ◽  
Building Materials ◽  
Performance Indicator ◽  
Mechanical And Thermal Properties ◽  
Activation Functions ◽  
Marquardt Algorithm ◽  
Artificial Neural

Growing concerns on energy consumption of buildings by heating and cooling applications have led to a demand for improved insulating performances of building materials. The establishment of thermal property for a building structure is the key performance indicator for energy efficiency, whereas high accuracy and precision tests are required for its determination which increases time and experimental costs. The main scope of this study is to develop a model based on artificial neural network (ANN) in order to predict the thermal properties of concrete through its mechanical characteristics. Initially, different concrete samples were prepared, and their both mechanical and thermal properties were tested in accordance with ASTM and EN standards. Then, the Levenberg–Marquardt algorithm was used for training the neural network in the single hidden layer using 5, 10, 15, 20, and 25 neurons, respectively. For each thermal property, various activation functions such as tangent sigmoid functions and triangular basis functions were used to examine the best solution performance. Moreover, a cross-validation technique was used to ensure good generalization and to avoid overtraining. ANN results showed that the best overall R2 performances for the prediction of thermal conductivity, specific heat, and thermal diffusivity were obtained as 0.996, 0.983, and 0.995 for tansig activation functions with 25, 25, and 20 neurons, respectively. The performance results showed that there was a great consistency between the predicted and tested results, demonstrating the feasibility and practicability of the proposed ANN models for predicting the thermal property of a concrete.

Effect of Compatibilizing Agent on Mechanical and Thermal Properties of Wood-Plastic Composites

2010 ◽  
Vol 150-151 ◽  
pp. 406-409
Author(s):  
Wen Lei ◽  
Xiao Yan Ding ◽  
Chi Xu
Keyword(s):  
Thermal Properties ◽  
Impact Strength ◽  
Raw Materials ◽  
Wood Flour ◽  
Mechanical And Thermal Properties ◽  
Molding Process ◽  
Plastic Composite ◽  
The Impact ◽  
Compatibilizing Agent ◽  
Thermal Stability Of

Polypropylene and wood flour were used as raw materials,maleic anhydride grafted polypropylene(MAPP) as compatibilizing agent, wood-plastic composite(WPC) was prepared by compression molding process. The effects of the content of MAPP on the mechanical and thermal properties of WPC were investigated. The results show that, with the increase of the content of MAPP, both the tensile and flexural strengths of WPC will increase, and the impact strength of WPC increases first, then decreases, and the impact strength reaches the maximum of 1.18kJ/m2 when the content of MAPP is 4%,which is 76.7% increased from that of the composite without MAPP. Each composite has an obvious heat-absorption peak when melted during 140-170 and the melting enthalpy of WPC increases with the content of MAPP, the melting procedures of all the composites are quite similar with one another. Application of MAPP can improve the thermal stability of WPC

scholarly journals Recycled thermoplastics modified bitumen improved with thermoplastic elastomer

2020 ◽  
Vol 150 ◽  
pp. 02015
Author(s):  
Nacer Akkouri ◽  
Khadija Baba ◽  
Sana Simou ◽  
Latifa ELfarissi ◽  
Abderrahman Nounah
Keyword(s):  
Thermal Properties ◽  
Softening Point ◽  
Raw Materials ◽  
Elastic Recovery ◽  
Thermal Sensitivity ◽  
Thermoplastic Elastomer ◽  
Plastic Waste ◽  
Rheological Parameters ◽  
Mechanical And Thermal Properties ◽  
Modified Bitumen

The use of different types of recycled plastic waste such as recycled polypropylene (PP), recycled low-density polyethylene (LDPE) and recycled polystyrene (PS), as raw materials for bitumen modification is known. However, the mechanical and thermal properties of recycled plastic waste modified bitumen (RPMB) are lower than those of the pure plastic modified bitumen. Therefor this paper aims to study the mechanical and thermal properties improvement of the RPMB with the use of a commercial elastomer styrene-butadiene-styrene (SBS). Initially conventional 35/50 quality bitumen was mixed with different percentages of LDPE, PS and PP, and then doped with commercial SBS. Basic rheological parameters such as penetration, softening point, elastic recovery and penetration index showed the changes caused by each rate of polymer addition to pure bitumen. The tests showed that the penetrability of the modified bitumen decreases and its softening point and elastic recovery increases, resulting in a decrease in the thermal sensitivity of the new bitumen mixture.

scholarly journals Modified gypsum binder for interior systems

2021 ◽  
Vol 258 ◽  
pp. 09086
Author(s):  
G.A Utegenova ◽  
M.O Asamatdinov ◽  
B.A Kalbaev ◽  
Andrey Medvedev ◽  
Alexey Zhukov
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Operating Conditions ◽  
Natural Material ◽  
Cement Mortars ◽  
Harmful Emissions ◽  
Pot Life ◽  
And Performance ◽  
Main Component ◽  
Traditional Processing

As the main component for many interior plaster mixes, a natural gypsum binder or its analogues is used, which are products of processing of local raw materials or by-products of other industries. Under operating conditions, gypsum binder-based plaster coatings have two main features. The first is the ability to regulate room humidity and absorb harmful emissions. The second is the ability to implement the function of barrier protection in the event of a fire. Improving the quality of plastering works and optimizing their cost is associated with the development of modified compositions based on gypsum, justified use of waste and local building materials, which include clay-gypsum binder. Clay gypsum as a natural material of sedimentary origin is widespread both in Russia and in the states formed in the post-Soviet space. In terms of energy intensity and manufacturability, the processing of raw materials into a clay-gypsum binder does not differ from the conditions of traditional processing of natural gypsum. Compared to lime or cement mortars, mortars based on gypsum binder have greater elasticity and plasticity. Such properties associated with the manufacturability of the application, such as workability and thixotropy, as well as the interval for maintaining the pot life of the mixture, are controlled by the introduction of modifying additives, the evaluation of the formulation of which was the purpose of the research, the results of which are presented in the article. The studies carried out have established that varying the recipe parameters make it possible to regulate both the strength and performance characteristics of mixtures based on gypsum plaster, as well as the manufacturability of their application.

scholarly journals Innovative Technologies for the Production of Ceramic Building Materials from Waste of Natural (Exogenous) Processes

2021 ◽  
Vol 906 (1) ◽  
pp. 012046
Author(s):  
Elena Shapakidze ◽  
Izolda Kamushadze ◽  
Lamara Gabunia ◽  
Ioseb Gejadze ◽  
Rajden Skhxvitaridze ◽  
...  
Keyword(s):  
Portland Cement ◽  
Building Materials ◽  
Raw Materials ◽  
Low Cost ◽  
High Energy ◽  
Raw Material ◽  
Clay Shale ◽  
Innovative Technologies ◽  
Ceramic Building ◽  
Main Component

Abstract The main material for the modern construction business is cement/concrete, the production of which is associated with high energy and material costs and, most importantly, high CO2 emissions into the atmosphere. Based on this, the development of technologies for new energy-efficient building materials - substitutes for Portland cement is of great importance. One of the ways to solve this problem could be the wider use of ceramic building materials, the production of which requires less energy and is not associated with high CO2 emissions compared to the production of Portland cement. The subject of this article is the development of innovative technologies for the production of ceramic building materials in Georgia (ordinary building bricks and clinker bricks) by using unconventional raw material - clay shale aluvium which is a waste of natural (exogenous) processes. As the main component of the ceramic mass, we used clay shale aluvium from the Duruji river bed near the town of Kvareli, which made it possible to reduce the firing temperature and improve the quality of the finished product. X-ray phase, petrographic and electronic microscopic studies have shown that ceramic products, both building and clinker bricks, made with the use of Kvareli shale, under the same firing conditions, have been obtained with a denser structure ensuring higher physical and mechanical features as compared to clay Metekhi, which is currently used by the brick factory in Georgia. The use of shale accumulated in the region of Kvareli in various areas of the economy (including production of ceramic building materials) will make it possible to clear the adjacent territory from risky deposits of natural alluvium, which threatens to flood the city and provide companies engaged in production of ceramic building materials with low-cost and environmentally friendly raw materials.

scholarly journals An all-natural bioinspired structural material for plastic replacement

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Qing-Fang Guan ◽  
Huai-Bin Yang ◽  
Zi-Meng Han ◽  
Zhang-Chi Ling ◽  
Shu-Hong Yu
Keyword(s):  
Thermal Properties ◽  
Structural Material ◽  
High Performance ◽  
Coefficient Of Thermal Expansion ◽  
Raw Materials ◽  
High Strength ◽  
Structural Materials ◽  
Mechanical And Thermal Properties ◽  
Good Thermal Stability ◽  
Assembly Method

Abstract Petroleum-based plastics are useful but they pose a great threat to the environment and human health. It is highly desirable yet challenging to develop sustainable structural materials with excellent mechanical and thermal properties for plastic replacement. Here, inspired by nacre’s multiscale architecture, we report a simple and efficient so called “directional deforming assembly” method to manufacture high-performance structural materials with a unique combination of high strength (281 MPa), high toughness (11.5 MPa m1/2), high stiffness (20 GPa), low coefficient of thermal expansion (7 × 10−6 K−1) and good thermal stability. Based on all-natural raw materials (cellulose nanofiber and mica microplatelet), the bioinspired structural material possesses better mechanical and thermal properties than petroleum-based plastics, making it a high-performance and eco-friendly alternative structural material to substitute plastics.

Magnesium-Based Binders and its Materials

2020 ◽  
Vol 850 ◽  
pp. 305-310
Author(s):  
Elvija Namsone ◽  
Irina Shvetsova ◽  
Genadijs Sahmenko ◽  
Aleksandrs Korjakins
Keyword(s):  
Thermal Properties ◽  
Energy Consumption ◽  
Magnesium Oxide ◽  
Experimental Research ◽  
Raw Materials ◽  
Research Work ◽  
Waste Materials ◽  
Mechanical And Thermal Properties ◽  
Binding Material ◽  
Caustic Magnesia

The experimental research work is dedicated to magnesium-based binders. Two types of magnesium oxide were added in the compositions of binders – caustic magnesia and raw materials and calcinated products. Dolomite waste material (dolomite powder) from three quarries (two in Latvia, one in Russia) was tested. Magnesium-based binders are described as low-CO2 emission materials, helping to reduce the energy consumption in building sector. The aim of this study is to investigate the possibility to obtain eco-friendly, low-CO2 emission binding material from local dolomite waste materials and research the physical, mechanical and thermal properties of obtained samples.

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