INFLUENCE OF ORGANOMINERAL ADDITIVES ON THE PROPERTIES OF PLASTERING MORTARS ON FINE SANDS WITH CLAYY IMPURITIES

2021 ◽  
pp. 94-100
Author(s):  
А. С. Успанова ◽  
А. З. Абуханов ◽  
З. Х. Исмаилова ◽  
Х-М. У. Киндаров
Keyword(s):  
Building Materials ◽  
Grain Composition ◽  
High Quality

Несмотря на многообразие строительных материалов на рынке, строительные штукатурные растворы остаются востребованным отделочным материалом ввиду их доступности и технологичности. В частности, потребление штукатурных растворов на территории Чеченской Республики неуклонно растет. Однако для приготовления качественных растворных смесей требуется наличие мелких песков соответствующего зернового состава, но местные пески относятся к группе мелких песков, а большая часть - к группе очень мелких песков. Для исследования возможности применения местных мелких песков Чеченской Республики, которые содержат значительное количество глинистых примесей, предлагается разработать органоминеральную добавку (ОМД) на золошлаковых смесях и рассмотреть ее взаимодействие с данными примесями. Despite the variety of building materials on the market, building plaster solutions remain a popular finishing material due to their availability and manufacturability. In particular, the consumption of plaster solutions on the territory of the Chechen Republic is steadily growing. However, for the preparation of high-quality mortar mixtures, the presence of fine sands of the corresponding grain composition is required, but local sands belong to the group of fine sands, and most of them belong to the group of very fine sands. To study the possibility of using local fine sands of the Chechen Republic, which contain a significant amount of clay impurities, it is proposed to develop an organomineral additive (OMА) based on ash and slag mixtures and consider its interaction with these impurities.

Research Progress for Gypsum Retarder

2014 ◽  
Vol 1015 ◽  
pp. 272-275
Author(s):  
Xiao Qiong Ren ◽  
Ya Nan Wu ◽  
Ying Li ◽  
Mo Han Lin ◽  
Feng Qing Zhao
Keyword(s):  
Organic Acids ◽  
Mechanical Strength ◽  
Building Materials ◽  
Setting Time ◽  
Strength Loss ◽  
Raw Material ◽  
Research Progress ◽  
High Quality ◽  
Protein Rich ◽  
Waste Mycelium

Gypsum retarder is an important additive of building materials. Commercial gypsum retarders are mainly composed of four types: organic acids, phosphates, protein and composite retarder. Although the effects of organic acids and phosphates have better retarding performances, there is still obvious a shortcoming that the mechanical strength reduces largely with time going by. Protein based retarders prolong the setting time of hemihydrates with less strength loss and higher costs. The gypsum retarder from waste mycelium, a protein-rich raw material, solved the problem of the disposal of waste mycelium from anti-biotic plants, while producing high-quality retarder for gypsum, shows potential for future.

scholarly journals Discussion on Applicability and Requirements for the Installation of Fastenings Using Robot Systems in the Construction Industry

2020 ◽  
Vol 51 (1) ◽  
pp. 1-8
Author(s):  
Arnim Johannes Spengler ◽  
Panagiotis Spyridis ◽  
Tobias Bruckmann ◽  
Alexander Malkwitz ◽  
Dirk Schlüter
Keyword(s):  
Construction Industry ◽  
Building Materials ◽  
Structural Safety ◽  
Construction Site ◽  
High Quality ◽  
Robot Systems ◽  
Increase Productivity ◽  
Precast Construction ◽  
The University ◽  
Creative Construction

Since robotics is becoming increasingly widespread in the construction industry, more phases and working steps should be investigated for their applicability to automation. Ideally, only few robot systems would be needed and thus be multifunctional.Current robot systems are used almost exclusively in precast construction. At the construction site, only prototypes are in use, and only individual parts of the building shell construction and assembly can be handled.This paper examines to what extent robots can be applied for the installation of fastenings and which boundary conditions exist or need to be addressed. Automated construction, and more precise installation of fastenings, has been partially implemented, which has been shown to increase productivity as well as installation quality, and therefore the components’ structural safety. This knowledge must now be extended to robots. The present work is based on an overview of current research and development and includes a discussion on the current research at the University Duisburg-Essen on a cable robot for brickwork construction. It further demonstrates that fastenings pose an important additional application, especially to ensure the changeover to other building materials. These can be built-in parts, but also brickwork connections or prefabricated parts.It can be assumed that robots will become increasingly important in the construction industry for reasons that include high quality, safety, speed and economic aspects.This is an extended paper of the Creative Construction Conference in Budapest on “Examination of Advanced Fastening Systems for the use of Robots in the Construction Industry” (Spyridis et al., 2019).

scholarly journals Quantification of anthropogenic metabolism using spatially differentiated continuous MFA

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Georg Schiller ◽  
Karin Gruhler ◽  
Regine Ortlepp
Keyword(s):  
Circular Economy ◽  
Building Materials ◽  
Fresh Concrete ◽  
Supply And Demand ◽  
Flow Analysis ◽  
Construction Materials ◽  
Recycled Aggregates ◽  
Lower Grade ◽  
High Quality ◽  
Local Conditions

AbstractCoefficient-based, bottom-up material flow analysis is a suitable tool to quantify inflows, outflows and stock dynamics of materials used by societies, and thus can deliver strategic knowledge needed to develop circular economy policies. Anthropogenic stocks and flows are mostly of bulk nonmetallic mineral materials related to the construction, operation and demolition of buildings and infrastructures. Consequently, it is important to be able to quantify circulating construction materials to help estimate the mass of secondary materials which can be recovered such as recycled aggregates (RA) for fresh concrete in new buildings. Yet as such bulk materials are high volume but of low unit value, they are generally produced and consumed within a region. Loops are thus bounded not only by qualitative and technical restrictions but also spatially to within regions. This paper presents a regionalized continuous MFA (C-MFA) approach taking account of these restrictions of local consumption, quality standards and technical limitations, illustrated using the example of Germany. Outflows and inflows of stocks are quantified at county level and generalized by regional type, considering demand and supply for recycled materials. Qualitative and technical potentials of recycling loops are operationalized by defining coefficients to reflect waste management technologies and engineering standards. Results show that 48% of outflows of concrete and bricks are suitable for high-quality recycling, while 52% of outflows do not fulfill the quality requirement and must be recovered or disposed of elsewhere. The achievable inflow to RA is limited by the building activity as well as the requirements of the construction industry, e.g. the RA fraction of fresh concrete must not exceed 32%. In addition, there exist spatial disparities in construction across the country. In Germany, such disparities mean that there will be a shortfall in RA of 6.3 Gt by the year 2020, while the technically available but unusable RA (due to a regional mismatch of potential supply and demand) will total 3.2 Gt. Comprehensive recycling strategies have to combine high-quality recycling with other lower-grade applications for secondary raw materials. Particularly in the case of building materials, essential constraints are not only technical but also local conditions of construction and demolition. These interrelations should be identified and integrated into a comprehensive system to manage the social metabolism of materials in support of circular economy policies.

scholarly journals ACCURACY OF HOLE PROCESSING WITH A COMBINED TOOL

2021 ◽  
Vol 6 (6) ◽  
pp. 80-86
Author(s):  
V. Goldobina
Keyword(s):  
Processing Time ◽  
Building Materials ◽  
Cutting Tool ◽  
Raw Materials ◽  
The Body ◽  
High Quality ◽  
Grinding Mills ◽  
Modes Of Processing ◽  
Precision Hole ◽  
Cutting Modes

Cement, powder metallurgy and various large-sized equipment are used in the industry of building materials for grinding raw materials. During operation, such equipment is exposed to external influences, especially at the joints, which reduce the reliability of the units. This leads to the early replacement of wearing parts. Large components of grinding mills are connected by flanges. The flanges are fastened with bolts, some of which must be precision, since they take the load of the equipment and ensure the tightness of the connection. The holes for precision bolts, respectively, must be accurate and of high quality. A study of the processing of holes with a reamer is given. The cutting elements of the tool, in the form of multifaceted plates, are mechanically attached to the body, which makes it possible to quickly replace the plate in case of wear or breakage. Such an assembled combined cutting tool allows to perform countersinking and reaming in one operation and thereby reduce the processing time of one hole and, in general, all precision holes in the flanges of the mill being repaired. The dependence of the precision hole accuracy on the shape and spatial deviation from the cutting modes of processing when using a combined tool is derived. The dependence is established for processing using a portable device with a rising spindle, as the most used equipment for repairs. The presented dependence makes it possible to predict the accuracy of machining holes with a combined tool, taking into account the rigidity of the technological system and calculate the required reamer accuracy.

scholarly journals Use of the Waste Foundry Sand in the Composition of Hot Sandy Dense Asphalt Concrete

2020 ◽  
Author(s):  
Kirill Yuryevich Tyuryukhanov ◽  
Konstantin Georgievich Pugin
Keyword(s):  
Elemental Composition ◽  
Asphalt Concrete ◽  
Building Materials ◽  
Raw Materials ◽  
Road Construction ◽  
Developed Countries ◽  
Raw Material ◽  
High Quality ◽  
Foundry Sand ◽  
Waste Foundry Sand

There is an increase in motorization worldwide, which in turn requires the construction of high-quality roads and highways. In both new construction and reconstruction of the pavement, large volumes of natural mineral materials are used, placing a large technogenic load on environmental objects during their extraction. In a number of regions of the Russian Federation, there are not sufficient volumes of conditioned raw materials for the production of high-quality composite building materials, such as asphalt concrete and cement concrete mixtures. The use of industrial waste in the composition of building materials addresses this issue while both solving environmental issues and reducing the cost of road construction. This article shows that developed countries successfully use the resource potential of waste in the production of building materials. This article proposes the use of waste foundry sand as the mineral raw material in the production of asphalt concrete. The article presents research on the following: geometric shape, elemental composition of the surface of the particles of the waste foundry sand; bitumen capacity; and the adhesion of bitumen. Based on the obtained data, a technology was developed for producing hot sandy asphalt concrete in which the waste foundry sand is used as a fine mineral aggregate. Physico-mechanical properties of the obtained samples of asphalt concrete satisfy the requirements established in GOST for asphalt concrete. Keywords: waste foundry sand, asphalt concrete, industrial material, elemental composition, bitumen

scholarly journals ALUMINOSILICATE MICROSPHERE PRODUCTION

2019 ◽  
pp. 134-139
Author(s):  
V. V. Shekhovtsov ◽  
O. G. Volokitin ◽  
R. E. Gafarov ◽  
M. A. Semenovykh
Keyword(s):  
Production Process ◽  
Energy Efficient ◽  
Building Materials ◽  
Plasma Jet ◽  
Physical Processes ◽  
High Quality ◽  
Plasma Energy ◽  
Optimum Parameters ◽  
New Energy ◽  
Gas Control

The development of new energy-efficient methods in the production of building materials is always important. One of such materials is microspheres which can be obtained by plasma energy. A study of physical processes during the formation of microsphere density determines the optimum parameters for the production of high-quality building materials. The article is devoted to production process of microspheres based on aluminosilicates. The plasma jet modes and their effect on the morphology of generated microspheres are investigated. It is shown that microspheres with different morphology can be produced by using a plasma gas control.  

scholarly journals Vietnamese Surface Mining - Training and scientific research for integrating the Fourth Industrial Revolution

2020 ◽  
Vol 61 (5) ◽  
pp. 1-15
Author(s):  
Nam Xuan Bui ◽  
Giao Si Ho ◽  
Keyword(s):  
Building Materials ◽  
Industrial Revolution ◽  
Labour Force ◽  
Scientific Research ◽  
Mining Industry ◽  
Surface Mining ◽  
High Quality ◽  
Fourth Industrial Revolution ◽  
Mining Coal

Department of Surface Mining, belonging to Faculty of Mining, of Hanoi University of Mining and Geology (HUMG), is one of the most traditional departments in HUMG, with 55 experience years in training Diplom Engineer, Master of Engineering and Doctor of Engineering for Vietnam. Surface Mining has an important role in Vietnamese Mining Industry, especially in mining coal, ore and building materials. To enhance the surface mining effect, high - quality labour force training and scientific research is very important, especially in the trend of integrating the fourth industrial revolution. The pape confirms the role of surface mining; lists the achievements of the Surface Mining Department; summaries the challenges of Vietnamese Surface Mining and trend of mining industry in integrating the fourth industrial revolution, and proposes some orientations in training and scientific research of Vietnamese Surface Mining for sustainable development.

scholarly journals DRY MIXTURES AND MIXING EQUIPMENT FOR THEIR PRODUCTION

2021 ◽  
Vol 5 (12) ◽  
pp. 145-150
Author(s):  
Y. Fadin ◽  
O. Shemetova
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Mixing Process ◽  
Chemical Additives ◽  
High Quality ◽  
Main Indicator ◽  
History Of ◽  
The Creation ◽  
The Stability

Today’s economic situation creates conditions for revising the existing base of materials and raw materials in construction, as well as for transforming and using it in the future. One of the ways to achieve this goal is the creation of new types of building materials, more effective and low in the price category compared to the classic ones. Dry building mixtures belongs to such materials. The high quality of dry building mixes is guaranteed by the stability of their composition and the properties of the ingredients used. Saving time when using high-quality dry building mixes will allow to get an irreproachable end result. A necessary component in the manufacture of dry building mixtures is the mixing process, which includes the preparation of raw materials, dosing and the distribution of chemical additives. The main indicator of the quality of the finished product in the production of dry mixes is its uniformity. Therefore, special attention is paid to the mixing section in the production line. The variety of bulk materials and their properties contributes to the creation of various types of mixers for high-quality mixing of components. The article discusses the history of the emergence of dry building mixes and mixing equipment for production.

scholarly journals Nixtamal techniques for different maize races prepared as tortillas and tostadas by women of Chiapas, Mexico

2022 ◽  
Vol 9 (1) ◽  
Author(s):  
Gabriela Palacios-Pola ◽  
Hugo Perales ◽  
Erin I. J. Estrada Lugo ◽  
Juan de Dios Figueroa-Cárdenas
Keyword(s):  
Central America ◽  
Environmental Conditions ◽  
Cooking Time ◽  
Grain Composition ◽  
High Quality ◽  
Alkaline Water ◽  
Relevant Variables ◽  
Maize Type ◽  
Special Process ◽  
Maize Race

AbstractNixtamalization, which means cooking maize in alkaline water, is the central technique for the culinary use of maize in Mexico and Central America. Without this procedure, relying on maize as the basic starch staple is inadequate because of nutriment deficiencies. Mexico has more than 50 principal racial types of maize, and these differ in grain qualities that can require the adjustment of the nixtamalization process. Properties such as hardness and grain composition influence nixtamalization because they are related to the absorption of water that occurs during cooking and steeping. Some maize preparations, like tortillas and tostadas, can also require the adjustment of nixtamalization to obtain a high-quality foodstuff. We studied how women in three regions of the state of Chiapas, which differ in the prevalent maize race available, prepare their nixtamal and whether they make changes according to the type of food they prepare. Interviews of 30 women follow the measure of relevant variables when the women prepared nixtamal. We found that nixtamalization is adjusted for different grain hardnesses and for environmental conditions. Variations were found in the cooking time of the nixtamal, in the amount of time the nixtamal was steeped, and in a special process of double boiling of the nixtamal performed by some women for tostadas. Women that specialize in production for the market have developed variations preferred by consumers. As practiced by women in Chiapas, nixtamalization is a flexible technique that is adjusted for maize type and for food preparations.

HIGH-QUALITY ENERGY-SAVING AND COMPETITIVE BUILDING MATERIALS, PRODUCTS AND CONSTRUCTIONS

2016 ◽  
Vol 2 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Сулейманова ◽  
Lyudmila Suleymanova
Keyword(s):  
Energy Saving ◽  
Building Materials ◽  
Construction Materials ◽  
Environmental Problems ◽  
Present Level ◽  
Building Sector ◽  
Resource Saving ◽  
High Quality

The use in the construction of modern high-quality, resource-saving materials, products and constructions will allow to significantly reduce the consumption of materials and power-consuming of building objects and to significantly reduce efficiency of building sector. The present level of development of production of construction materials, products and constructions plays one of the main roles in solving the environmental problems of civilization

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