scholarly journals Technological properties of porous concrete autoclave and non-autoclave hardening

2020 ◽  
pp. 23-28
Author(s):  
O.M. Nedbailo ◽  
O.G. Chernyshyn
Keyword(s):  
Building Materials ◽  
Transfer Problem ◽  
Filling Material ◽  
Technological Properties ◽  
Resource Saving ◽  
Porous Concrete ◽  
Standard Documents ◽  
Mass Construction ◽  
Technology Indicators ◽  
Cellular Concrete

Some aspects of resource saving problem in the process of construction of heated construction installations are considered in the paper, also heat transfer problem in porouse concrete. Is paid attention to necessity of application with mass construction of habitation of products from porouse concrete, first of all - products from of cellular concrete. In article the basic requirements of the standard documents regulating constructive properties of various building materials, including various concrete are analysed. The design a warm wall on the basis of products from porous concrete is considered. Its advantages in comparison with known designs of warm walls are shown. In article changes of technological properties of various building materials are considered at influence on them of a moisture. The analysis of the standard-regulating documents, concerning operational qualities, concerning reliability and durability of designs is carried out. The basic technical properties gas-concrete non-autoclave solidification on the basis of a waste stone machining are analysed. Results of researches technology indicators cement cellular concrete non-autoclave solidification with offered filling material are resulted.

The Research of Iron Containing Wastes Modification Process of Leninabad Rare Metals Plant

2021 ◽  
Vol 410 ◽  
pp. 778-783
Author(s):  
Pavel V. Matyukhin ◽  
Daler I. Mirzoev
Keyword(s):  
Chemical Composition ◽  
Building Materials ◽  
Raw Material ◽  
Filling Material ◽  
Rare Metals ◽  
X Ray ◽  
Modification Process ◽  
Before And After ◽  
The Republic ◽  
Enrichment Process

The paper presents the results of ferriferous wastes modification process research carried on the basis of JCS “Leninobad rare metals Plant” located in the Republic of Tajikistan. The wastes for the study were taken from the western tailing. The article presents the justification of the chosen wastes as a filling material in the development of new radiation protective composite building materials. The data on the initial ferriferous chemical composition of the tailing wastes and the chemical composition of the material that passed the enrichment process is presented. The study contains microphotos of ferriferous haematite raw material particles surface before and after completing the modifying process. The paper presents and describes the study of X-ray phase analysis diffractograms of enriched iron-containing wastes before and after the modification process. The current research proves that the enrichment ferriferous wastes particles modification process is possible and as a result it can be used as a filling for the development of new kinds of radioprotective composite materials.

scholarly journals PECULIARITIES OF MATERIAL RESOURCE MANAGEMENT OF ENTERPRISES OF BUILDING MATERIALS

2021 ◽  
Author(s):  
Iryna Hobyr ◽  
Lidiia Hobyr
Keyword(s):  
Inventory Management ◽  
Building Materials ◽  
Construction Materials ◽  
Design And Technology ◽  
Resource Saving ◽  
New Production ◽  
Utilization Factor ◽  
Resources Management ◽  
Material Resources ◽  
Definition Of

In a market economy, it becomes important to improve the organization of enterprise management and, above all, the production process, efficient use of financial, material resources and inventories. Effective management of material resources increases profits and provides the necessary investment. To maintain high profitability and liquidity, the management of current activities of enterprises, in particular inventory management plays a significant role. The categorical apparatus of material resources management at the enterprise is considered, the definition of “material resources” is generalized, the definition of "material resources management" is offered, and also the system of material resources management at the enterprise is considered. In the management of material resources at the enterprise there are 2 approaches – logistics and reengineering. The main tasks of the mechanism of management of material resources of the enterprise of building materials are defined. These are: increasing the efficiency of material resources and choosing cheap sources of funding; introduction of new production, resource-saving technologies; minimization of costs for procurement, production and marketing activities; increasing the interest of employees of all services in the effective performance of their duties; product quality management. The analysis of efficiency of use of material resources at the enterprises of building materials which has shown, that manufacture of production is rather material-intensive is carried out. This is evidenced by the share of material costs in the cost of work, and the value of the utilization factor of materials indicates the economical use of material resources in production. Reserves for improving the efficiency of material resources at construction materials enterprises have been identified. The ways of the most rational use of material resources of construction materials enterprises are offered, in particular it is improvement of a design and technology of manufacturing of products, introduction of more progressive norms of expenses of resources, use of substitute materials, and reduction of losses at stages of transportation, storage and industrial use.

Resource-Saving Technologies in the Thermal Insulation-Structural Foam Glass Production

2019 ◽  
Vol 974 ◽  
pp. 356-361
Author(s):  
O.V. Kuznetsova ◽  
N.D. Yatsenko ◽  
A.I. Subbotin ◽  
M.Yu. Klimenko
Keyword(s):  
Building Materials ◽  
Raw Materials ◽  
Foam Glass ◽  
Scientific Research ◽  
Glass Production ◽  
Environmental Safety ◽  
Resource Saving ◽  
Structural Foam ◽  
Safety Requirements ◽  
Research Areas

The modern building materials market places high demands on heat-insulating and heat-insulating structural materials. In this connection, the issues of developing high-quality building materials obtained on the resource-saving technologies basis allowing to solve two interrelated problems are topical. The first problem is the industrial waste generated and existing stocks disposal. The second is associated with a decrease in the traditional raw materials deficit [1]. These problems solution, combining rational technological solutions, is based on the scientific research achievements in this area, in particular in the foam glass production. The priority scientific research areas in the foam glass materials production are the developments related to the study, the new raw materials use and the production of foam glass mixture compositions on their basis, which provide, along with the necessary performance properties, high environmental safety requirements [2, 3].

Composite Binder for Structural Cellular Concrete

2019 ◽  
Vol 945 ◽  
pp. 53-58 ◽  
Author(s):  
M.Y. Elistratkin ◽  
E.S. Glagolev ◽  
M.V. Absimetov ◽  
V.V. Voronov
Keyword(s):  
Building Materials ◽  
Negative Impact ◽  
Average Density ◽  
Construction Costs ◽  
Competitive Situation ◽  
Composite Binder ◽  
Mineral Supplements ◽  
Autoclaved Aerated Concrete ◽  
Aerated Concrete ◽  
Cellular Concrete

Non-autoclaved aerated concrete is the only viable alternative to gas silicate when organizing its manufacture on the basis of regional small and medium capacity production. This aims to improvement the competitive situation on the building materials market and optimizing the construction costs. The possibility of expanding the application field of this material due to the increase in strength characteristics while maintaining an unchanged average density is of special interest. The guarantee of proposed solutions economic and technical efficiency is the transition from traditional portland cement to composite binders based on it. The article discusses the quantity and composition of the mineral supplements feasibility to optimize the binder properties of the problem peculiarities to reduce consumption of cement and chemical modifiers that increase the rate of curing and totals of non-autoclaved aerated concrete investigated compatibility issues between components to eliminate their negative impact on the formation of porous structure of the final product.

Technology of Building Composites on the Basis of Portlandite-Aluminosilicate Contact Condensation Systems of Hardening

2019 ◽  
Vol 802 ◽  
pp. 79-90
Author(s):  
Alexander Valerievich Tereshkin ◽  
Irina Vladimirovna Kirichkova ◽  
Vladimir Viktorovich Kruglyak
Keyword(s):  
Energy Efficiency ◽  
Building Materials ◽  
Resource Saving ◽  
Technological Developments ◽  
Ancient Times ◽  
Contact Condensation ◽  
Construction Practice

Since ancient times, lime, lime pozzolanic, lime-cement, lime-clay binders, the compositions of which our ancestors found empirically, widely and everywhere used in construction. Even in the first half of the XX century, these binders occupied a significant place in the construction practice. The development of production and the relative availability of cement led to a significant reduction in demand for many clinker-free, including lime (Portland) binders. Today, the priorities of scientific and applied technological developments of both traditional building materials and materials of new generations are determined by the actualization of the concept and criteria of resource saving and energy efficiency.

scholarly journals Effect of Granite Residue Incorporation on the Behavior of Mortars

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1449 ◽  
Author(s):  
Afonso Rangel Garcez de Azevedo ◽  
Markssuel Teixeira Marvila ◽  
Laimara da Silva Barroso ◽  
Euzébio Bernabé Zanelato ◽  
Jonas Alexandre ◽  
...  
Keyword(s):  
Water Retention ◽  
Building Materials ◽  
Building Construction ◽  
Squeeze Flow ◽  
Technological Properties ◽  
Rheological Characterization ◽  
Ornamental Stone ◽  
Fresh State ◽  
The World ◽  
Residue Incorporation

Civil construction is one of the most resource-consuming sectors in the world. For this reason, the last years have witnessed the study of reusing industrial residues in building materials. The ornamental stone processing industry has a considerable environmental liability related to residue generation during the cutting stages of granite blocks. The objective of this work is to analyze the viability of incorporating granite residues, up to 100%, to substitute sand in coating mortars for building construction. Mortars without residue, as control, and incorporated with 20, 40, 60, 80, and 100% of granite residue were subjected to consistency tests, incorporated air and water retention together with the rheological characterization using the squeeze-flow and the dropping-ball methods. The results show that mortars with 40% granite residues presented greater plastic deformation, helping their applicability by also presenting improved technological properties in the fresh state.

scholarly journals RESOURCE-SAVING TECHNOLOGIES FOR PROCESSING WASTE OF BUILDING MATERIALS TO ENSURE ENVIRONMENTAL SAFETY AND THEIR SECONDARY USE

2020 ◽  
pp. 145-159
Author(s):  
V.D. Klyuev ◽  
Yu.A. Biryukov ◽  
V.V. Panayetova
Keyword(s):  
Building Materials ◽  
Construction Materials ◽  
Environmental Safety ◽  
Processing Waste ◽  
Resource Saving ◽  
Secondary Use

The article deals with the problem of using resource-saving technologies for processing construction materials waste to ensure environmental safety and reuse of materials during the dismantling (demolition) of buildings. Justification is given for the development and adaptation of the theory of using resource-saving technologies in the organization of dismantling (demolition) of buildings.

scholarly journals Development of resource-saving and environmentally safe beryllium bronze soldering technology

2020 ◽  
Vol 100 (4) ◽  
pp. 46-54
Author(s):  
Stanislav Berezhnyy ◽  
Oleksii Kapustian ◽  
Ruslan Kulykovskyi ◽  
Ihor Avdeev ◽  
Danylo Uriekin
Keyword(s):  
Electrical Conductivity ◽  
Technological Properties ◽  
Resource Saving ◽  
Beryllium Bronze ◽  
Solder Flux ◽  
Environmentally Safe ◽  
Soldering Technology ◽  
Technical Specifications ◽  
The Cost ◽  
Vacuum Systems

The composition of the solder, which provides the necessary technological properties of the product, namely, electrical conductivity and mechanical strength of the junction was selected. The possibility of brazing beryllium bronze with a silver contact plate by furnace brazing using fluxes based on NaCl: CaCl2: CaF2 salts, respectively (24: 61: 15% mass) in the atmosphere was established. The possibility of brazing BrB2 beryllium bronze in the atmosphere using a research flux based on the eutectic of the NaCl – CaCl2 system (28…72% wt.) adding 15% CaF2 over a copper layer is shown. The technology for brazing beryllium bronze BrB2 with silver contact plates with silver solder PSr68 has been developed. The brazing process is combined with the hardening operation, which allows avoiding additional thermal operations; flux residues are removed during hardening and do not actually need additional cleaning operations; applied solder, flux components and technologies for applying a layer of copper are not scarce and relatively cheap, which can significantly reduce the cost of the product, subject to the requirements of the technical specifications. A technological process that makes it possible to refuse of using vacuum systems and toxic fluxes has been developed.

scholarly journals INVESTIGATION INTO LOW DENSITY POROUS CONCRETE PENETRABILITY BY AIR/MAŽO TANKIO AKYTOJO BETONO ORO LAIDUMO TYRIMAI

1996 ◽  
Vol 2 (7) ◽  
pp. 41-45 ◽  
Author(s):  
Antanas Laukaitis ◽  
Laima J. Kunskaitė
Keyword(s):  
Portland Cement ◽  
Raw Materials ◽  
Low Density ◽  
Product Density ◽  
Porous Concrete ◽  
Acoustical Properties ◽  
Concrete Production ◽  
Cement Binder ◽  
Mixture Samples ◽  
Cellular Concrete

Low-density (250–350 kg/m3) porous concrete has good thermal insulation and acoustical properties. However, the determination of these properties requires a lot of time and is rather costly. Changes in these properties can be determined, if the porous concrete air penetrability, which can be simply found, is known. This paper deals with porous concrete made using Portland cement binder and a binder mixture (lime + Portland cement), as well as with foam concrete air penetrability coefficient value dependency on its density and water/dry solids ratio V/K. The raw materials composition is given in Table 1. Fig. 1 represents the air penetrability determination apparatus scheme. Air penetrability increases with a decrease of density in porous concrete sample. For example, when V/K=0.6 and product density decreases from 490 to 310 kg/m3, the air penetrability coefficient increases from 2.5·10−7to 13.1·10−7 m3/m·S·Pa. Porous concrete air penetrability increases with an increase in V/K (Fig. 2.). The air penetrability coefficient increases from 6·6·10−7 to 12.8·10−7 m3/m·S·Pa when the product density is 350 kg/m3 and V/K changes from 0.5 to 0.7. Changes in V/K have a greater influence on low density porous concrete air penetrability. That is why, when slowly hydrating Portland cement is used for porous concrete production, foaming formation mixture temperature is not high, it binds and is cured very slowly. For higher density product pore structures such a slow curing process does not have any effects, because small, spherical pores prevail. When the water content is increased in the formation mixture, a change in product porous structure is observed, because larger deformed coupled pores are formed and therefore the air penetrability increases. An air penetrability dependency on product density and V/K regression equation (3) is given. Air penetrability coefficients of porous concrete made using a mixed binder (lime + Portland cement) are given in Table 2. It has been established, that a 20% Portland cement equivalent amount of lime in the binder mixture according to equation 1 and when the V/K ratio increased from 0.52 to 0.65, the some density product air penetrability coefficient of equal density products increased by 3 times, while the lime content in the binder increased from 20 to 80% from formation mixture samples with V/K ratio =0.52. Air penetrability of porous concrete made using a mixed binding material also depends on concrete density and formation mixture V/K ratio (Fig. 3.). Cellular concrete air penetrability coefficient values are given in Fig. 4. Cellular concrete differs from porous concrete, because its air penetrability coefficient values decrease with an increase in V/K ratio. This is the reason why cellular concrete air penetrability coefficients are lower than those of porous concrete. Cellular concrete air penetrability coefficient dependency on product density and V/K ratio is expressed by equation 4.

scholarly journals Influence of aeration rate and method of process activation on the degree of purification of zinc-containing waste water by ferritization

2021 ◽  
Vol 6 (10 (114)) ◽  
pp. 16-22
Author(s):  
Bogdan Yemchura ◽  
Gennadii Kochetov ◽  
Dmitry Samchenko ◽  
Oleksandr Kovalchuk
Keyword(s):  
Zinc Ferrite ◽  
Building Materials ◽  
Aeration Rate ◽  
Ferrite Phase ◽  
Quantitative Composition ◽  
Zinc Ions ◽  
Resource Saving ◽  
Residual Concentration ◽  
Comparison Of The Results ◽  
Degree Of Purification

The aeration rate for the degree of purification of highly concentrated galvanic wastewater from zinc and ferrum ions was investigated using various activation methods. It is shown that the intensity of aeration has a significant effect on the quality of wastewater treatment and the characteristics of water treatment sludge. The efficiency of the use of an energy-saving method for activating the ferritization process with the use of electromagnetic pulses for the extraction of zinc ions from wastewater has been confirmed. It was determined that with an increase in the aeration rate to 3.5 dm3/min per 1 dm3 of the reaction mixture and the use of thermal activation of the process, the residual concentration of zinc ions remains within the range of 0.12÷0.2 mg/dm3. In this case, the concentration of ferrum ions decreases to values of 0.08÷0.14 mg/dm3. It was found that at an aeration rate of 2.5 dm3/min and the use of pulsed electromagnetic (EMP) activation, the residual concentrations of heavy metal ions decrease to values of 0.08÷0.16 mg/dm3. Comparison of the results indicates the advisability of using low rates of aeration of the reaction mixture. This, together with the use of resource-saving EMR process activation, allows to achieve a significant reduction in energy costs. The quantitative phase composition of ferritization precipitates was determined, in which the crystalline phases of zinc ferrite Zn2Fe2O4 and magnetite Fe3O4, as well as ferrum oxyhydroxide FeO (OH) and sodium sulfate Na2SO4, prevail. It is found that with an increase in the volumetric aeration rate, the proportion of the ferrite phase increases. At an aeration rate of 2.0 dm3/min, more than 85 % of the zinc ferrite phase was found in the sediments. Taking into account the qualitative and quantitative composition of precipitates, it is recommended to use them in the production of building materials. The experimental results obtained make it possible to provide a comprehensive processing of liquid galvanic waste.

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