Pressed Magnesia Composites with Improved Weather Resistance Properties

2021 ◽  
Vol 1043 ◽  
pp. 27-35
Author(s):  
Nonna Stupen ◽  
Alexander Kaklyugin ◽  
Lubov Kastornykh ◽  
Viktor Kovalenko
Keyword(s):  
Physicochemical Analysis ◽  
Pressing Method ◽  
Best Available Technologies ◽  
Strength Change ◽  
Air Resistance ◽  
Mineral Additive ◽  
Weather Resistance ◽  
Water Saturated ◽  
The Cost ◽  
Control Samples

The results of studies aimed at increasing the resistance to weathering of building products based on magnesia cement are presented. This goal was achieved by the use of mine burnt rock as a modifying additive and the use of molding sands compaction pressing method. The influence of the modifier on the compressive strength change of compressed composites in dried and water-saturated state, the softening and air resistance coefficients, as well as the linear deformations of the control samples after a specified number of alternating wetting and drying cycles, was investigated. The physical and mechanical characteristics of the control samples were determined according to the standard and generally accepted methods. The formation of a complex combined structure of modified magnesian composites, containing coagulation, condensation and crystallization phases with a clear predominance of the first, has been confirmed by the physicochemical analysis methods. It is shown that modification of magnesian cement with burnt rock purposefully changes the processes of structure formation and causes an increase in water and air resistance of pressed composites based on it. The proposed method for modifying pressed magnesia products prevents loosening of their structure under alternating stresses, reduces linear deformations and, as a result, slows down fatigue failure. The involvement of a secondary resource in the composition of molding sands as an active mineral additive leads to a decrease in the cost of products and allows the method of their production to be attributed to the best available technologies. The developed compositions of pressed magnesia composites are recommended for the production of small-piece products used in building envelopes, as well as for flooring in the rooms with more than 60% humidity.

scholarly journals Using a magnesia binder to improve the airproof performance of molded composites

Vestnik MGSU ◽  
2021 ◽  
pp. 176-185
Author(s):  
Nonna S. Stupen ◽  
Alexandr V. Kaklyugin ◽  
Luybov I. Kastornykh ◽  
Viktor V. Kovalenko
Keyword(s):  
Building Materials ◽  
Water Resistance ◽  
Wetting And Drying ◽  
Mineral Additive ◽  
Reference Specimens ◽  
Number Of Cycles ◽  
Water Saturated ◽  
The Cost ◽  
Micro Silica ◽  
Weather Impacts

Introduction. Water resistance is one of durability criteria of building materials. As a rule, the value of the liquefaction ratio is applied to assess the water resistance. However, even water resistant materials are not always able to withstand cyclical weather impacts that cause linear deformations, reduced strength and cause destruction of building products. Therefore, it is necessary to take into account the resistance of building materials, namely, their resistance to alternating humidification and drying (airproof performance). The purpose of this research is to study the producibility of molded composites containing a modified magnesium binder that features higher resistance to weather impacts. Materials and methods. The magnesium binder was modified by the silica fume and high pressure molding to increase the water resistance and airproof performance of the composites. The influence produced by the modifier on the change in the compressive strength of dried and water-saturated molded composites, liquefaction and airproof performance ratios, as well as linear deformations of the reference specimens were studied following a pre-set number of cycles of alternating wetting and drying. Results. The water resistance and airproof performance of construction products, containing magnesia binders, may be improved by the micro-silica, added to pressed mixtures, and their compaction by press molding. Compositions of molded composites, containing a modified magnesia binder, were developed for the manufacture of products used to make enclosing structures and for the flooring of rooms having the indoor humidity of over 60 %. Conclusions. It is established that molded composites containing a modified magnesia binder feature high resistance to alternating wetting and drying. The proposed method of modifying magnesia binders prevents the destruction of molded stone-like materials containing these binders in case of exposure to alternating stresses; it reduces linear deformations and, as a result, decelerates the fatigue failure. The use of a recyclable material as a mineral additive must contribute to the reduction of the cost of products and allow to consider the method of their production as one of the best technologies available.

Effectiveness the use of additive MEGA-VIT in the ration of mares of Shetland pony breed

2020 ◽  
pp. 60-67
Author(s):  
G. Uskov ◽  
A. Tsopanova ◽  
T. Perezhogina
Keyword(s):  
Physiological State ◽  
Mineral Elements ◽  
Positive Influence ◽  
Control Group ◽  
Physiological Indicators ◽  
Mineral Additive ◽  
Nutritional Needs ◽  
Young Horses ◽  
The Cost ◽  
Experimental Group

Complete feeding of ponies is provided on the basis of data on their nutritional needs depending on age, sex, physiological state and level of productivity (the amount of milk produced and the intensity of growth of young animals). Ponies are sensitive to a lack of vitamins and mineral elements in the feed. When there is a sufficient amount of organic and mineral substances, but a lack or absence of vitamins, horses and ponies have impaired metabolism. The purpose of this work is to study the effectiveness of the use of vitamin and mineral additive MEGA-VIT in the rations of pregnant and lactating mares of Shetland pony breed. It has been found during of the researches that the vitamin and mineral additive MEGA-VIT had a positive influence on the productive and physiological indicators of animals. The cost of spent feed for the entire period of experiment in the control group was 50,6 thousand rubles, and in the experimental group it was 11,8 thousand rubles more or 23,5 %. Revenue from the sale of young horses of the control group amounted to 400 thousand rubles, and experimental group – 440 thousand rubles, this is by 40 thousand rubles more than in control group. This led to the increase in profit in the experimental group of mares by 28,1 thousand rubles and accordingly the level of profitability by 3,2 %. It has been recommended on the results have been obtained on the base of researches to include 30 g/head/day in the rations of mares of Shetland pony breed during pregnancy, and 50 g/head/day during lactation.

POTENTIAL USE COCONUT MILK AS ALTERNATIVE TO ALKALI SOLUTION FOR GEOPOLYMER PRODUCTION

2016 ◽  
Vol 78 (11) ◽  
Author(s):  
Gahasan Fahim Huseien ◽  
Jahangir Mirza ◽  
Mohd Warid Hussin ◽  
Mohd Azreen Mohd Ariffin
Keyword(s):  
Compressive Strength ◽  
Alkali Solution ◽  
Coconut Milk ◽  
Fine Aggregate ◽  
Strength Tests ◽  
Last Stage ◽  
The Cost ◽  
The Impact ◽  
Potential Use ◽  
Control Samples

This work aims to verify the feasibility of utilizing coconut milk as the alkali activator solution in geopolymer production and the impact on mortar properties; geopolymer mortar is  still more expensive than ordinary Portland cement mortar simply because the cost of alkali solution. Coconut milk is extensively available in Malaysia and very rich in potassium and sodium. In this research, the coconut milk was used as alkali solution (100%) at first, and then replaced by NaOH, Na2SiO3 and in the last stage mixed with NaOH and Na2SiO3 at 50%. Normal solution component of Na2SiO3 and NaOH with 8 M, and used as control samples. Binder to fine aggregate (B:A) and solution to binder (S:B) ratios were fixed at 1.5 and 0.30 respectively. Multi blend binder based geopolymer mortar are used in this study. The samples were cured with different conditions, cured at room temperature and oven temperature of 60 and 90°C. Compressive strength tests were carried out to determine the properties of hardened mortar. The samples prepared with coconut milk showed low compressive strength as compared to control samples, The results demonstrated that using coconut milk as alternative to alkali solution in geopolymer industry is not a viable option.

Freeze-Thaw Resistance of Concrete Modified by Rice Hull Ash and Gangue

2014 ◽  
Vol 488-489 ◽  
pp. 700-703
Author(s):  
Jing Yun Han ◽  
Liang Liang Zhang ◽  
Hai Yang Zhang
Keyword(s):  
Compressive Strength ◽  
Research Work ◽  
Environmental Problems ◽  
Rice Hull ◽  
Rice Hull Ash ◽  
Freeze Thaw ◽  
Concrete Production ◽  
The Cost ◽  
Control Samples

Currently, most rice hull is piled up or burned naturally, resulting in many environmental problems. It is a potentially good way to incinerate specially rice hull into the ash that is used as concrete admixture. The research work was done and results indicate that the compressive strength of the concrete with addition of 1%, 2% and 3% of rice hull ash increased by 6.8%16.7% and 15.1% respectively compared with control samples. And the compound addition of rice hull ash and gangue not only improved the mechanical and anti-freeze-thaw properties of concrete, but also decreased the cost of concrete production.

Improving Masonry and Protective Paints Quality

2017 ◽  
Vol 265 ◽  
pp. 359-364
Author(s):  
A.V. Vyboishchik ◽  
I.L. Kostiunina
Keyword(s):  
Industrial Waste ◽  
New Technologies ◽  
Chemical Properties ◽  
Urban Buildings ◽  
Key Factor ◽  
Weather Resistance ◽  
Chelyabinsk Region ◽  
The Cost ◽  
Physical And Chemical ◽  
Atmospheric Phenomena

The environment, along with other reasons, is a key factor influencing the living conditions of urban population in Russia today. One of the main drawbacks restraining the process of aesthetic improvement of modern Russian cities is the unsatisfactory protection of buildings from the atmospheric phenomena. Industrial waste, however, is another reason preventing long-lasting decoration of urban buildings. The article presents an overview of the composition and physical properties of masonry paints used in Chelyabinsk Region. The traditional technology of obtaining coatings, e.g. liquid glass, is studied, the drawbacks of this technology are examined, the new applications are offered. The influence of additives on the basic properties of masonry paints, viz. weather resistance, viscosity, hardness, cost, is considered. The application of new technologies utilizing industrial waste can solve the above-stated problem, which also will, along with improving the basic physical and chemical properties, result in reducing the cost and increasing the hardness of masonry paints.

scholarly journals Optimization Model and Pollution Treatment of Sintering Ore Distribution

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Yibo Wang ◽  
Hao Yue ◽  
Huibo Wang
Keyword(s):  
Raw Materials ◽  
Physicochemical Analysis ◽  
Smelting Process ◽  
Advanced Degree ◽  
Sintering Process ◽  
Iron And Steel ◽  
Factors Affecting ◽  
Ore Distribution ◽  
The Cost

sintering process plays an important role in iron and steel smelting process. The subsequent production of blast furnace ironmaking is directly affected by the quality of sinter. Among them, the proportion of raw materials and the advanced degree of sintering process are the two main factors affecting the quality of sinter. Because the control parameters of sintering process are too many and the physical and chemical process is too complex, it is difficult to establish and control the model accurately. Therefore, workers have long relied on experience to set temperature and other factors to engage in production, resulting in the quality of sinter is unstable, the cost is not easy to be controlled. Moreover, the flue gas produced in the sintering process will have different effects on the environment. Through the data analysis of the ore distribution scheme and the results of the physicochemical analysis of sinter in a steel plant, two aspects of the work are completed: one is to establish the optimal model of the cost of the sintering process, and the most suitable temperature for the sintering process. The second is the analysis of harmful components produced in sintering process.

scholarly journals Numerical Analysis and Fabrication of Battery Holder for Two Wheelers

2020 ◽  
Vol 78 (2) ◽  
pp. 114-131
Author(s):  
K. N Chethan ◽  
V Sabarinathan ◽  
R Vivek Ram ◽  
G. T Mahesh
Keyword(s):  
Injection Moulding ◽  
High Performance ◽  
Low Cost ◽  
Flow Analysis ◽  
Nylon 6 ◽  
Nylon 66 ◽  
Weather Resistance ◽  
The Cost ◽  
Two Wheeler ◽  
The Impact

The high-performance plastics usage is increasing in the automobile field because of its advantages over other metals and alloys. Corrosion resistance, light weight, low cost, flexibility in design are the major advantages of plastics above the conventional metallic materials. In this paper a metal version component converted into plastic version in order to increase efficiency, reduce the overall cost of a two-wheeler and to improve the production rate of component. Different types of material such as PP + 15% TALC, PP + 30% GF, PP + 30% TALC, Nylon 6 + 15% GF, Nylon 66 UF, Nylon 6 UF, Nylon 66 + 30% GF, ASA LI941 and ASA LI913 tested for 10,000km road test, vibration test and fitment test. An injection moulding used to produce the component and ‘Mouldx3D’ software was used for mould flow analysis and other simulation. The different parts of injection moulding tool made up of C45, P20 and D2 materials. Among different materials, ASA LI913 was selected since it has better weather resistance than others and the impact strength matched to metal version component. Finally, it was found that the cost of the component made of Plastic considerably less than same component made of metal.

EFFECTIVENESS OF THE TECHNOLOGY DIFFUSION-PRESSING EXTRACTION OF SUCROSE OUT FROM SUGAR-BEET COSSETTES

2018 ◽  
Author(s):  
Р.С. РЕШЕТОВА ◽  
В.О. ГОРОДЕЦКИЙ ◽  
С.О. СЕМЕНИХИН ◽  
Н.И. КОТЛЯРЕВСКАЯ
Keyword(s):  
Cost Effectiveness ◽  
Sugar Beet ◽  
Technology Diffusion ◽  
Economic Effect ◽  
Sucrose Content ◽  
Pressing Method ◽  
Solids Content ◽  
Fresh Pulp ◽  
The Cost ◽  
And Diffusion

Рассмотрены особенности диффузионного и диффузионно-прессового способов извлечения сахарозы из свекловичной стружки при работе на диффузионных аппаратах с наклонной, колонной и ротационной типами конструкции. Обосновано использование жомопрессовой воды в составе экстрагента. Дан расчет экономической эффективности применения диффузионно-прессового извлечения сахарозы из свекловичной стружки. Установлено, что при диффузионно-прессовом извлечении сахарозы из свекловичной стружки эффективность процесса достигается при величине отбора диффузионного сока 105–110% к массе свеклы при остаточном содержании сахарозы в свежем жоме 2,0–2,5% к его массе. Дальнейшее доизвлечение сахарозы прессованием до содержания сухих веществ 24–28% в прессованном жоме обеспечивает достижение потерь с прессованным жомом на уровне 0,35% к массе свеклы. Чистота возвращаемой в составе экстрагента жомопрессовой воды будет примерно равной чистоте клеточного сока и не окажет существенного влияния на чистоту диффузионного сока. Ожидаемый экономический эффект от перехода на диффузионно-прессовый способ извлечения сахарозы составит 62–72 млн р. для завода производительностью 4000 т свеклы в сутки, а производственный сезон сократится на 10–12 сут. Features of diffusion and diffusion-pressing methods of extraction of sucrose from sugar-beet cossettes are considered when working on diffusion apparatus with inclined, column and rotational types of construction. The use of pulp water as part of the extracting is substantiated. The cost-effectiveness of realization diffusion-pressing extraction of sucrose from sugar-beet cossettes is estimated. It was established that the effective extraction is carried out at a flow rate of the diffusion juice of 105–110% to beet mass, reaching a residual sucrose content in fresh pulp 2,0–2,5% to its mass. Further extraction of sucrose by pressing to a solids content of 24–28% in pressed pulp provides achievement of losses with pressed pulp at 0,35% to beet mass. The expected economic effect of shifting to a diffusion-pressing method of sucrose extraction is 62–72 million rubles for a factory with a capacity of 4000 tons of beet per day, and also the production season is reduced by 10–12 days.

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