THE INFLUENCE OF FORCED CARBONIZATION ON THE PROPERTIES  OF GYPSUM-LIME SYSTEMS BASED ON SECONDARY RAW MATERIALS

the use of secondary raw materials for the production of building materials is a modern trend in solving environmental problems. In the Republic of Crimea, dumps of secondary raw materials – phosphogypsum and lime dust – have accumulated in large quantities at various enterprises. The analysis of phosphogypsum, which has been in the dumps for more than 5 years, showed that by its quality indicators it can be attributed to the 2nd grade in accordance with GOST 4013-2019, and the specific effective activity of the material (Aeff) corresponds to the I class of materials, which makes it suitable for the production of gypsum binders. Prototypes-cylinders were made from a mixture of phosphogypsum with lime dust of 1:1 composition at a pressure of 30 MPa and then subjected to hardening according to three schemes, in order to separate the passage of various types of hardening and study each of them for the physico-mechanical properties of the resulting material. The analysis of experimental data made it possible to establish the effectiveness of simultaneous flow in the system of two types of hardening – carbonate and hydration for lime and phosphogypsum components of the raw mixture, respectively. As a result of the organization of a mixed type of hardening of gypsum-lime binder, samples with a compressive strength of 26.5 MPa and a softening coefficient of 0.63 were obtained within 90 minutes. The calcium carbonate formed in the process, which is the product of the reaction between calcium hydroxide and carbon dioxide, significantly increases the water resistance of the hydration products of gypsum binder. It is established that with an optimal combination of technological factors and hardening conditions, a significant increase in the physical and mechanical characteristics of the carbonized material is possible in a short time.

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Clay tile from the mineral and secondary raw materials available in the Republic of Belarus

Glass and Ceramics ◽

10.1007/bf02782517 ◽

1997 ◽

Vol 54 (1-2) ◽

pp. 12-16 ◽

Cited By ~ 1

Author(s):

I. A. Levitskii ◽

E. M. Dyatlova ◽

G. Ya. Minenkova

Keyword(s):

Raw Materials ◽

Secondary Raw Materials ◽

The Republic ◽

Clay Tile

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Environmental and radiation assessment of construction materials in Tyumen

Samara Journal of Science ◽

10.17816/snv2021102105 ◽

2021 ◽

Vol 10 (2) ◽

pp. 40-44

Author(s):

Elena Viktorovna Zakharova ◽

Elena Viktorovna Gaevaya ◽

Leonid Nikolaevich Skipin ◽

Svetlana Sergeevna Tarasova ◽

Vasilyа Zinnurovna Burlaenko

Keyword(s):

Building Materials ◽

Specific Activity ◽

Raw Materials ◽

Natural Radionuclides ◽

Construction Materials ◽

Natural Radionuclide ◽

Maximum Activity ◽

Crushed Stone ◽

Natural Activity ◽

Effective Activity

The current pace of construction leads to the use of large volumes of construction raw materials, which must meet the regulatory indicators, including radiation. High levels of natural radionuclide activity, both in construction and finishing materials, affect changes in the gamma radiation indicators in the premises, which can negatively affect the health of people living in such facilities. Ecological and radiation assessment of building materials for the content of natural radionuclides showed an increased natural activity of potassium-40. The maximum activity values were observed in samples of bricks and expanded clay, where they were 799,0 and 622,0 Bq/kg, respectively. The lowest specific activity of natural potassium was observed in the crushed stone sample (21,3 Bq/kg). The specific activity of thorium-232 in building materials ranged from 2,1 to 53,3 Bq/kg. The activity of radium-226 in all the studied samples ranged from 4,4 Bq/kg (crushed stone) to 55,6 Bq/kg (cement). The specific effective activity of natural radionuclides in the studied building materials does not exceed the standard values (370 Bq/kg), therefore, they can be used in all types of construction and reconstruction.

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Correction: Lyubomirskiy, N., et al. Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials. Materials 2020, Vol. 13, 2304

Materials ◽

10.3390/ma13163477 ◽

2020 ◽

Vol 13 (16) ◽

pp. 3477

Author(s):

Nikolai Lyubomirskiy ◽

Aleksandr Bakhtin ◽

Stanisław Fic ◽

Małgorzata Szafraniec ◽

Tamara Bakhtinа

Keyword(s):

Building Materials ◽

Raw Materials ◽

Secondary Raw Materials

The authors wish to make the following correction to this paper [...]

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Evaluation of Import Substitution Potential of Products from Secondary Raw Materials of Animal Husbandry

Journal of Environmental Management and Tourism ◽

10.14505//jemt.v12.2(50).04 ◽

2021 ◽

Vol 12 (2) ◽

pp. 341

Author(s):

Oxana DENISSOVA ◽

Zhadyra KONURBAYEVA ◽

Alfiya ZAKIMOVA ◽

Madina RAKHIMBERDINOVA

Keyword(s):

Raw Materials ◽

Import Substitution ◽

Animal Husbandry ◽

Annual Growth Rate ◽

Industrial Complex ◽

Secondary Raw Materials ◽

Per Capita ◽

The Republic ◽

Step Algorithm ◽

High Level

Animal husbandry is one of the main sectors of the country's economy, which can demonstrate significant results of import substitution shortly. In article dynamics of such relative indicators characterizing scales of industrial activity in the sphere of animal industries, as a share of the branch in the Kazakhstan economy and volumes of production of animal industries per capita of Kazakhstan is considered. For example, the average annual growth rate of this indicator is compared with countries with a high level of development of this industry. It was found out that the use of secondary raw materials of animal husbandry will promote the development of new industries and import substitution of both raw materials and finished products, which will attract innovative technologies in the agro-industrial complex. The article presents a step-by-step algorithm of research of the import-substituting potential of the industry, as well as its practical testing (by the example of the Republic of Kazakhstan). Volumes of production on branch "animal industries" are defined, connections of import dependence and the agrarian production made abroad are established.

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Intensive Ways of Producing Carbonate Curing Building Materials Based on Lime Secondary Raw Materials

Materials ◽

10.3390/ma13102304 ◽

2020 ◽

Vol 13 (10) ◽

pp. 2304 ◽

Cited By ~ 1

Author(s):

Nikolai Lyubomirskiy ◽

Aleksandr Bakhtin ◽

Stanisław Fic ◽

Małgorzata Szafraniec ◽

Tamara Bakhtinа

Keyword(s):

Building Materials ◽

Raw Materials ◽

Construction Materials ◽

Co2 Concentration ◽

Optimization Methods ◽

Accelerated Carbonation ◽

Secondary Raw Materials ◽

Production Wastes ◽

Limestone Dust ◽

Carbonation Curing

The article is dedicated to the research and development of intensive methods for curing products by capturing and binding CO2. It aims to improve and increase the productivity of technologies for the production of artificially carbonated building materials and products. Soda production wastes, limestone dust and finely dispersed limestone dust were used as the research objects. Secondary raw materials have been investigated using modern methods of phase composition and granulometry test. Intensive methods of production of accelerated carbonation of systems consisting of soda wastes were tested using multi-parameter optimization methods. The effects of recycled lime materials on the strength and hydrophysical properties of the obtained material were determined. The secondary raw materials effect depended on the composition of the raw mixture, molding conditions, CO2 concentration applied to the carbonate curing chamber, and the duration of exposure to environments with high CO2 content. It was found that the most effective way of providing accelerated carbonation curing of construction materials and products is a combined carbonation method, combining the principles of dynamic and static methods. It was concluded that the optimal CO2 concentration in the gas-air mixtures used for carbonate curing is 30%–40%.

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DEVELOPMENT OF SMALL BUSINESSES IN THE REPUBLIC OF KAZAKHSTAN

Problems of AgriMarket ◽

10.46666/2020-4-2708-9991.13 ◽

2020 ◽

Vol 4 ◽

pp. 109-117

Author(s):

G.K. SAPAROVA ◽

◽

A.М. ALSHYNBAY ◽

G.А. DZHAMBAYEVA ◽

◽

...

Keyword(s):

Small Businesses ◽

Government Regulation ◽

Agricultural Sector ◽

Raw Materials ◽

Public Support ◽

Animal Husbandry ◽

Industrial Complex ◽

Agricultural Producers ◽

Effective Activity ◽

The Republic

The materials are related to the research of issues of public support for the development of small forms of business (SFB) in Kazakhstan. The most important link in agro-industrial complex is agriculture, which provides the country with food products and industry with raw materials. The article examines the domestic and international experience of public support of commodity producers, which makes it possible to draw a conclusion about the need to improve government regulation measures, taking into account regional characteristics, and implementation of State and sectoral programs. The authors note that the availability of budget funds has a significant impact on the effective activity of small businesses. The analysis showed the limited possibilities of attracting loans and other financial sources by small businesses. The solution to these problems should be carried out on the basis of the purchase of a guaranteed volume of manufactured products, provision of loans at the expense of budgetary allocations, concessional lending and taxation, subsidies. The necessary measures of government assistance for the development of the industry as a whole have been determined, in particular, animal husbandry, intensive gardening, and sugar beet processing. Based on the results of the developments, it was concluded that with financial and property support of agricultural producers, including small categories of agribusiness, the tasks set for agricultural sector - increase in market share of domestic products, decrease in import dependence will be implemented. Small farms play an important role in the production of agricultural products, food supply, social stability in the countryside.

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ANALYSIS OF THE POSSIBILITIES OF IMPROVING THE QUALITY OF INSULATION FROM SECONDARY RAW MATERIALS AND THE PROSPECTS OF THEIR USE IN CONSTRUCTION

Bridges and tunnels Theory Research Practice ◽

10.15802/bttrp2021/233988 ◽

2021 ◽

pp. 85-90

Author(s):

А. V. RADKEVICH ◽

V. I. ANIN ◽

V. V. RADCHENKO ◽

A. A. SHUVAEV

Keyword(s):

Information Technologies ◽

Flame Retardants ◽

Building Materials ◽

Raw Materials ◽

Construction Materials ◽

Comparative Characteristic ◽

Value Analysis ◽

Secondary Raw Materials ◽

Modern Technologies

Purpose. Research and analysis of opportunities to improve the quality of insulation from secondary raw materials to study the prospects of their use in the construction industry as innovative materials with better performance than traditional ones. Materials made from secondary raw materials are of great importance not only in the formation of the building materials market, but also in the Ukrainian economy. The processing infrastructure creates a large number of jobs and tax deductions to the budget. In addition, the consumption of energy resources and the cost of servicing energy mains directly depend on the improvement of the thermal efficiency of premises and structures. The use of modern technologies of building materials combines economy, efficiency and durability of structures. Methodology. An important role in the development of modern construction production is played by the possibility of developing and improving the quality of building materials and technologies for their use. In modern conditions of the market of construction products there is an urgent need for constant modernization of construction processes, due to the efficient use of raw materials and the latest processing methods. With the use of modern information technologies and theoretical and methodological ways to solve problems, it becomes possible to consider options for improving the characteristics of building materials by combining qualitative characteristics and eliminating negative ones. Findings. This paper presents scientifically sound methods of modernization of secondary raw materials in the composition of insulation materials with high thermal and economic characteristics, which are able to compete in the market with traditional building materials. The analysis of flame retardants was carried out. Originality. Theoretical and methodological directions have been formed on the basis of research on the use of secondary raw materials for the manufacture of insulation in construction. The comparative characteristic is carried out. The conclusion on the competitiveness of the presented materials in the market of construction materials is made. Practical value. Analysis of the application of modern technologies for recycling on the basis of the latest theoretical and practical approaches, with the subsequent elimination of shortcomings. Consideration of the possibility of adding flame retardants to the composition of materials. Use of materials as insulation of premises and buildings. Development of processing infrastructure of Ukraine.

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The use of screening of crushed granite stone for the production of building materials

MATEC Web of Conferences ◽

10.1051/matecconf/202134001004 ◽

2021 ◽

Vol 340 ◽

pp. 01004

Author(s):

Fedor Gorbunov ◽

Lilia Berdnikova ◽

Victor Bulgakov ◽

Alexandra Fadina ◽

Andrey Lapin

Keyword(s):

Compressive Strength ◽

Building Materials ◽

Raw Materials ◽

Construction Materials ◽

Processing Temperature ◽

Crushed Granite ◽

Liquid Products ◽

Pore Liquid ◽

Technogenic Raw Materials ◽

Softening Coefficient

The possibility of using technogenic raw materials – the screening of crushed stone with the addition of cullet based on a silicate binder for the production of construction materials for structural purposes is studied. By varying the processing temperature, it was possible to increase the softening coefficient of the products and to achieve the pH neutrality of their pore liquid. Products processed at a temperature of 500700 °C have the following performance characteristics: the compressive strength 16.6-31.4 MPa, the bendingstrength 3.4-5.9 MPa.

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Development of Flooring Materials with Cellular Waste

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.688.172 ◽

2013 ◽

Vol 688 ◽

pp. 172-175

Author(s):

Eva Tůmová ◽

Rostislav Drochytka

Keyword(s):

Mechanical Properties ◽

Building Materials ◽

Raw Materials ◽

Construction Materials ◽

Essential Element ◽

Lightweight Construction ◽

Secondary Raw Materials ◽

Flooring Materials

In the development of floor structures new building materials, additives, fillers and secondary raw materials of various properties are increasingly used. It is possible to develop new types of materials with different mechanical properties. Lightweight construction materials are the essential element for industrial floors lightening and thereby for reduce of their weight. This is especially beneficial for multi-storey buildings.

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Study of zeolite-containing silicon rocks of Dagestan for obtaining a mineral additive to cement

Vestnik of Geosciences ◽

10.19110/geov.2021.10.5 ◽

2021 ◽

Vol 10 ◽

pp. 42-46

Author(s):

A. R. Yusupov ◽

◽

S. A. Mamaev ◽

Z. A. Yusupov ◽

A. S. Mamaev

Keyword(s):

Building Materials ◽

Raw Materials ◽

Total Content ◽

Cement Clinker ◽

Resource Base ◽

Siliceous Rocks ◽

Productive Stratum ◽

Mineral Additive ◽

The Republic ◽

Technological Study

Siliceous-carbonate rocks are widespread on the territory of the Republic of Dagestan, in which the total content of zeolites and opal-cristobalite-tridymite phase (OCT) exceeds 45 %, and the content of calcite is above 30 %. The rocks, composing a productive stratum (at least, most of it), lithologically correspond to opoka-like and highly siliceous limestones, zeolite-containing (10–15 %) and zeolite (40 % or more), weakly quartz and weakly clayey. However, they are distinguished from pure limestones by a low value of actual calcite part — often less than 50 %. Therefore, in this case, the section of the productive strata is defined as «folded by siliceous-carbonate zeolite-containing rocks.» Such rocks, in accordance with the results of laboratory and technological study, are considered as raw materials for the production of building materials. Zeolite-containing rocks are suitable for use as an additive in Portland cement, which will save cement clinker in the production process and improve the quality of cement. Prospecting works for zeolites and zeolite-containing rocks in the Levashinskaya (Levashinsky district) and Rubaschayskaya (Tabasaran and Kaitagsky districts) areas of Mountainous Dagestan were carried out by the non-metallic party of JSC Sevkavgeologiya in 2007–2009. The resources of siliceous zeolite-containing rocks are in the P1 category — 49.308 million tons, in the P2 category — 69.470 million tons. The predicted resources, their laboratory and technological properties (physicochemical, chemical, technological) indicate the possibility of creating a solid mineral resource base and construction of large complexes for the extraction and processing of zeolites and siliceous rocks in Levashinsky (Levoberezhny and Pravoberezhny areas) and Tabasaran (Dyubek area) regions of the Republic of Dagestan.

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