Hyper-Pressed Composites from Recycling Products of Aerated Concrete Waste

2021 ◽  
Vol 410 ◽  
pp. 784-789
Author(s):  
Vitaly A. Beregovoi ◽  
Aleksandr M. Beregovoi
Keyword(s):  
Material Properties ◽  
Water Resistance ◽  
Physical And Mechanical Properties ◽  
Raw Material ◽  
Pressing Method ◽  
Joint Influence ◽  
Aerated Concrete ◽  
The Individual ◽  
Main Component ◽  
Concrete Recycling

A technology has been developed for obtaining wall materials by the hyper-pressing method, including the recycling of large-tonnage waste from the production of autoclaved aerated concrete. The main component of the raw mixture is finely ground filler fractions, obtained by crushing substandard fragments of aerated concrete. The joint influence of raw mixture, the parameters of pressing and the conditions of hardening on the indicators of material properties has been investigated. There was given a quantitative assessment of the individual components contribution of the raw material composition to the indicators of the physical and mechanical properties of the material. The mechanism is disclosed of the constructive effect of aerated concrete recycling waste and plasticizing additives on the water resistance and strength of samples. The promising areas of application of hyper-pressed materials in modern construction are presented.

scholarly journals The parameterization of the demand for machinery as a Dimension-and-Quality function affecting industrial furniture production

2021 ◽  
Vol 338 ◽  
pp. 01013
Author(s):  
Witold Jarecki ◽  
Marek Wieruszewski ◽  
Bartosz Pałubicki ◽  
Krzysztof Wiaderek ◽  
Łukasz Matwiej ◽  
...  
Keyword(s):  
Production Efficiency ◽  
Physical And Mechanical Properties ◽  
Processing Parameters ◽  
Individual Characteristics ◽  
Raw Material ◽  
Transport Systems ◽  
Feed Speed ◽  
Or Efficiency ◽  
Wood Processing ◽  
The Individual

Machine processing parameters, including the feed speed and the working speeds of tools, are determined by: the minimum demand for material in a specific branch of the furniture industry, the expected quality, as well as the form and type of wood processed. Due to the considerable diversity of physical and mechanical properties of raw wood there are high demands concerning process and machine individualisation in technology planning. Setting the right processing parameters is necessary to make high-quality semi-finished and finished products. In order to increase the precision of machining specialised tool and transport systems need to be used. At the same time, the increase in the required production efficiency is inversely correlated with the individual characteristics of the raw material and the desired indicators of the quality of products. A harmonised level of these parameters is the main assumption in the selection of machine tools and auxiliary devices. The analyses conducted in this study showed that there are numerous variables in methods of selecting machines and devices for raw wood processing. When selecting machining systems, enterprises should use a system of weights to indicate which elements (quality and dimensions or efficiency) are of primary importance for them.

Glass-Crystalline Materials of a Cellular Structure, Formed by Vibration Foaming Technology

2021 ◽  
Vol 410 ◽  
pp. 823-828
Author(s):  
Vitaly A. Beregovoi ◽  
Dmitry S. Sorokin ◽  
Aleksandr M. Beregovoi
Keyword(s):  
Cellular Structure ◽  
Raw Material ◽  
Crystalline Materials ◽  
Vibration Effect ◽  
Glass Forming ◽  
Gas Formation ◽  
Joint Influence ◽  
Plastic Strength ◽  
Main Component ◽  
Foaming Technology

A method for producing cellular materials on a glass-crystalline matrix has been developed. The formation of a porous structure is ensured by the process of gas formation, combined with a vibration effect on the raw mass. The possibility of gaining the plastic strength of the raw mass, sufficient for fixing the cellular structure of the raw material without adding binders, has been established. The main component of the raw material mixture is a finely ground filler, obtained after grinding glass-crystalline frit of a specially selected composition. For its formation pre-compacted raw masses, containing natural silica and glass-forming additives, are heated. There was investigated the joint influence of the compositions formulation and the roasting parameters on the properties indicators of the glass composite.

Effect of log loading on the performance of wood room

2014 ◽  
Vol 29 (2) ◽  
pp. 201-210
Author(s):  
Ari Isokangas ◽  
Kari Ala-Kaila ◽  
Markku Ohenoja ◽  
Aki Sorsa ◽  
Kauko Leiviskä
Keyword(s):  
Product Quality ◽  
Material Properties ◽  
Raw Material ◽  
Performance Criteria ◽  
Processing Unit ◽  
Level Control ◽  
Paper Mills ◽  
Remarkable Effect ◽  
Loading Process ◽  
Small Wood

Abstract The purpose of this paper is to analyse the log loading process of wood room, which is typically the first processing unit in pulp and paper mills. The aim is to improve the log loading process to obtain production with a constant log flow of well de-iced logs to the debarking drum. This way it is possible to reduce costs and enhance product quality. The research was carried out utilising a log loading simulator. The parameters of the simulation model were selected on the basis of process observations on a mill. The results indicate that it is essential to adjust the process and equipment parameters, raw material properties and truck loader operation together in order to reach the target capacity with minimum costs. Especially the speed of the infeed conveyor affects all performance criteria and should be selected carefully. In addition, wood yard logistics and raw material properties have a remarkable effect on the wood room performance. The results can be utilised in mills to allow the upper level control perform in a planned way so that small wood loss and good product quality can be obtained.

scholarly journals Behavioral and Antennal Responses of Tribolium confusum to Varronia globosa Essential Oil and Its Main Constituents: Perspective for Their Use as Repellent

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4393
Author(s):  
Cesar Auguste Badji ◽  
Jean Dorland ◽  
Lynda Kheloul ◽  
Dimitri Bréard ◽  
Pascal Richomme ◽  
...  
Keyword(s):  
Essential Oil ◽  
Tribolium Confusum ◽  
High Dose ◽  
Synthetic Chemicals ◽  
Stored Product Pest ◽  
Indigenous Plant ◽  
Main Components ◽  
Electroantennogram Recordings ◽  
The Individual ◽  
Main Component

Essential oils of aromatic plants represent an alternative to classical pest control with synthetic chemicals. They are especially promising for the alternative control of stored product pest insects. Here, we tested behavioral and electrophysiological responses of the stored product pest Tribolium confusum, to the essential oil of a Brazilian indigenous plant, Varronia globosa, collected in the Caatinga ecosystem. We analyzed the essential oil by GC-MS, tested the effects of the entire oil and its major components on the behavior of individual beetles in a four-way olfactometer, and investigated responses to these stimuli in electroantennogram recordings (EAG). We could identify 25 constituents in the essential oil of V. globosa, with anethole, caryophyllene and spathulenole as main components. The oil and its main component anethole had repellent effects already at low doses, whereas caryophyllene had only a repellent effect at a high dose. In addition, the essential oil abolished the attractive effect of the T. confusum aggregation pheromone. EAG recordings revealed dose-dependent responses to the individual components and increasing responses to the blend and even more to the entire oil. Our study reveals the potential of anethole and the essential oil of V. globosa in the management of stored product pests.

The Experimental Study on the Inhibition Effect of Fusarium oxyspomm with Bio-Slurry Based on Material Properties

2013 ◽  
Vol 675 ◽  
pp. 317-321
Author(s):  
Meng Ying Fang ◽  
Li Chun Liu ◽  
Fang Yin ◽  
Wu Di Zhang ◽  
Shi Qing Liu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Material Properties ◽  
Water Soluble ◽  
Inhibition Mechanism ◽  
Main Subject ◽  
Soluble Substance ◽  
Inhibition Effect ◽  
Water Soluble Substance ◽  
Main Component ◽  
Better Than

Using petroleum ether to extract the fermentative fluid (bio-slurry), then to get the inhibition mechanism of it, and infer which is the main component in inhibition mechanism of biogas. The conclusion found by the experiment is that fat soluble substance is better than water soluble substance in inhibition mechanism, and fat soluble substance is close to 75% biogas fermentation fluid, while water soluble substance is worst. That is to say, the main subject in inhibition mechanism is hided in the fat soluble substance.

Material Properties and Design Aspects of Folding Bicycle Frame

2011 ◽  
Vol 264-265 ◽  
pp. 777-782 ◽  
Author(s):  
M.A. Maleque ◽  
M.S. Hossain ◽  
S. Dyuti
Keyword(s):  
Material Properties ◽  
Raw Material ◽  
New Materials ◽  
Materials Properties ◽  
Advantages And Disadvantages ◽  
Bicycle Frame ◽  
Successful Design ◽  
Future Direction ◽  
The Relationship ◽  
Comprehensive Study

successful design of folding bicycle should take into account the function, material properties, and fabrication process. There are some other factors that should be considered in anticipating the behavior of materials for folding bicycle. In order to understand the relationship between material properties and design of a folding bicycle and also for the future direction in new materials with new design, a comprehensive study on the design under different conditions are essential. Therefore, a systematic study on the relationship between material properties and design for folding bicycle has been performed. The advantages and disadvantages matrix between conventional bicycle and folding bicycle is presented for better understanding of the materials properties and design. It was found that the materials properties of the folding bicycle frame such as fatigue and tensile strength are the important properties for the better performance of the frame. The relationship between materials properties and design is not straight forward because the behavior of the material in the finished product could be different from that of the raw material. The swing hinge technique could be a better technique in the design for the folding bicycle frame.

Albizia richardiana King & Prain as a raw material for ply and particleboard

2015 ◽  
Vol 22 (3) ◽  
pp. 139-141
Author(s):  
Md. Rahaman ◽  
Khurshid Akhter ◽  
S. Hossain ◽  
Md. Islam
Keyword(s):  
Bending Strength ◽  
Urea Formaldehyde ◽  
Physical And Mechanical Properties ◽  
Solid Content ◽  
Raw Material ◽  
Standard Specification ◽  
Press Temperature ◽  
Albizia Richardiana ◽  
German Standard ◽  
Press Time

Woods of Albizia richardiana has been studied for assessing the suitability for plywood and particleboard manufacture. It was found that 1.5 mm thick smooth and figured veneer can be peeled and dried easily. Three-ply plywood were made using veneer of this species bonded with liquid urea formaldehyde glue of 50% solid content extended with wheat flour and catalyzed (ammonium chloride) with 2% hardener under the three specific pressures, viz,1.05 N/mm2, 1.40 N/mm2, 1.76 N/mm2 in three replications at 6 minute press time and 120°C press temperature. Dry and wet shear test were conducted on the sample and their shear load at failure per unit area and percentage of wood failure were determined. 1.05 N/mm2 pressure for the manufacture of plywood was found to be the best. The physical and mechanical properties of Albizia richardiana wood particleboard were studied. The particleboards were tested for determining the strength and dimensional stability. The tensile strength 0.56N/mm2 passed the British and German standard specification, bending strength (modulus of rupture10.80N/mm2) was found nearest to Indian Standard but low German and British standard specification.

THE MODERN PROCESSES OF RADICALIZATION AND THEIR CONNECTION WITH TERRORIST ACTIVITY

2021 ◽  
Vol 17 (1) ◽  
pp. 162-168
Author(s):  
Petar MARINOV
Keyword(s):  
Social Processes ◽  
Terrorist Activity ◽  
The Individual ◽  
Main Component ◽  
The Impact

Abstract: In its modern manifestations, terrorism increasingly relies on synergy between different influences and approaches. This allows the impact, the effect of which significantly exceeds the mechanical sum of the effects of the individual forms and approaches. The main component and motivational tool of terrorism is the process of radicalization. Despite the lack of consensus on the understanding of the phenomenon of radicalization. This phenomenon is imposed as a consequence and result of increasingly complex social processes in modern and postmodern societies.

Development of 3D Printing Technology with Ceramic Paste and Study of Properties of Printed Corundum Products

2021 ◽  
Vol 1040 ◽  
pp. 178-184
Author(s):  
Andrey S. Dolgin ◽  
Aleksei I. Makogon ◽  
Sergey P. Bogdanov
Keyword(s):  
3D Printing ◽  
Aluminum Oxide ◽  
Reference Sample ◽  
Physical And Mechanical Properties ◽  
Ceramic Technology ◽  
Raw Material ◽  
Energy Costs ◽  
Additive Technology ◽  
X Ray ◽  
Manufacturing Time

Today 3D printing with ceramics is a promising direction in the development of additive technologies. In this work, we have developed a technology for printing with ceramic pastes based on aluminum oxide and wax, namely: an extruder for printing with ceramic pastes was modeled and manufactured, the composition of the slip was selected and the paste for printing was made. After choosing the print parameters, test samples were printed: a disk and a box. Since 3D printing with ceramics is just one of the stages of manufacturing ceramic products, then we selected the parameters for drying and sintering the raw material. Drying of products is necessary to burn off an excess amount of a binder (paraffin), and due to sintering; the raw material acquires final strength and mechanical characteristics. After sintering, the sintering parameters and physical and mechanical properties of the products were measured. The microstructure of the printed products was studied using scanning electron microscopy. The phase change during sintering was studied by X-ray analysis. All obtained properties were compared with a reference sample (corundum tile made of aluminum oxide of the same grade, but using traditional ceramic technology, including pressing, drying and sintering of the product). In terms of all properties, the printed ceramics are not significantly inferior to the reference sample; however, in general, the additive technology has more advantages, such as a wide variety of shapes, shorter manufacturing time for parts, and lower energy costs.

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