scholarly journals Granular Aggregates Based on Finely Dispersed Substandard Raw Materials

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 369
Author(s):  
Valery Lesovik ◽  
Liliya Zagorodnyuk ◽  
Vladislav Ryzhikh ◽  
Ruslan Lesovik ◽  
Roman Fediuk ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Raw Materials ◽  
High Strength ◽  
Component Composition ◽  
High Specific Surface Area ◽  
Nonferrous Metallurgy ◽  
Cement Stone ◽  
Quartz Sands ◽  
Ecological Problems ◽  
Physical And Mechanical Characteristics

It is necessary to solve the ecological problems of regions where there is large-tonnage storage of various finely dispersed materials, including technogenic ones. This article presents the results of an investigation into the possible use of substandard dispersed quartz sands to obtain effective granular aggregates, with the purpose of putting them to use in mortars and concrete. The study used standard and original experimental research methods related to the analysis and preparation of raw materials, technological tests, and the study of the properties of finished composites. Investigations were carried out to obtain composite binders in the component composition of which the use of different ratios of Portland cement and substandard quartz sands prepared in a vortex jet mill was envisaged. It was found that the obtained composite binders had high physical and mechanical characteristics, which was due to the high specific surface area and hydration activity. On the basis of composite binders and finely dispersed quartz sands (fineness from ≤0.16 mm to 1 mm), the granulation of mixtures of 36 types of component compositions was performed. The developed compositions of granular aggregates (GAs) showed the possibility of obtaining them with sufficiently high strength values in cement stone. The studies carried out make it possible to recommend finely dispersed substandard and technogenic materials for the production of GAs, which would ensure the economy of binding materials as well as contribute to the reuse of large-tonnage waste of ferrous and nonferrous metallurgy and the chemical and mining industries.

Promising hybrid fabrics based on carbon and aramid fibers as a reinforcing filler for polymer composites

2019 ◽  
pp. 86-95 ◽  
Author(s):  
G. F. Zhelezina ◽  
V. G. Bova ◽  
S. I. Voinov ◽  
A. Ch. Kan
Keyword(s):  
Composite Material ◽  
Polymer Composites ◽  
Carbon Fibers ◽  
Mechanical Characteristics ◽  
High Strength ◽  
High Modulus ◽  
Hybrid Composite Material ◽  
Hybrid Fabric ◽  
Reinforcing Filler ◽  
Physical And Mechanical Characteristics

The paper considers possibilities of using a hybrid fabric made of high-modulus carbon yarn brand ZhGV and high-strength aramid yarns brand Rusar-NT for polymer composites reinforcement. The results of studies of the physical and mechanical characteristics of hybrid composite material and values of the implementation of the strength and elasticity carbon fibers and aramid module for composite material are presented. 

Binder for colored asphalt based on light hydrogenated petroleum polymer resins

2020 ◽  
pp. 36-48
Author(s):  
V.A. Kochetkova
Keyword(s):  
Quality Indicators ◽  
Mechanical Characteristics ◽  
Raw Materials ◽  
Organic Binder ◽  
Polymer Resin ◽  
Petroleum Polymer ◽  
Technology Of Production ◽  
Petroleum Polymer Resin ◽  
Physical And Mechanical Characteristics

The article provides an overview of the production of binders, sets out the requirements for the quality indicators of colored asphalt, the technology of production of binders, and also considers promising areas in the production of colorless binders. The purpose of the work was to create an affordable organic binder based on light hydrogenated petroleum polymer resins and use the developed binder for colored asphalt. To achieve this goal, we analyzed patents for the production of binders, on the basis of which the composition of raw materials was selected, and studied the physical and mechanical characteristics of the obtained samples on both hydrogenated and non-hydrogenated petroleum polymer resin.

scholarly journals Concrete Surfacing Using Surface Energy of Nanoparticles

2018 ◽  
Vol 7 (4.7) ◽  
pp. 356 ◽  
Author(s):  
Anastasia Sychovа ◽  
Larisa Svatovskaya ◽  
Dmitriy Starchukov ◽  
Vassily Gera ◽  
Maxim Sychov
Keyword(s):  
Surface Energy ◽  
Mechanical Characteristics ◽  
Dynamic Strength ◽  
High Strength ◽  
Silica Sol ◽  
Alternative Source ◽  
Electron Microscopy Data ◽  
High Dynamic ◽  
Microscopy Data ◽  
Physical And Mechanical Characteristics

This article considers scientific and practical principles of concrete surfacing. As it was found, such production can be done by impregnating the surface of high-strength concrete with silica sol, measuring the surface energy of nanoparticles introduced. A technique was introduced for calculating surface energy of sols, so was the range of energy necessary to create concrete with a shock resistant surface, determined by measurement and calculation. The content contains possible reactions resulting in new phases in the concrete top during the impregnation with silica sol. Physical and mechanical characteristics of surfaced concrete were also outlined ad considered, so were the XRD data and electron microscopy data. Various types of energy used to surface concrete until high dynamic strength were compared. This article provides evidence that surface energy of sol nanoparticles can be considered as an independent alternative source.  

Development of Cement Compositions with a Finely Dispersed Additive for Consolidation of Soil by the Injection

2019 ◽  
Vol 974 ◽  
pp. 149-155
Author(s):  
Irina V. Kozlova ◽  
Alexey E. Bespalov ◽  
Alexandra V. Bespalova
Keyword(s):  
Compressive Strength ◽  
Portland Cement ◽  
Mechanical Characteristics ◽  
Cement Stone ◽  
Soil Consolidation ◽  
Injection Solution ◽  
Concentrated Load ◽  
Reduced Viscosity ◽  
Injection Technology ◽  
Physical And Mechanical Characteristics

Cement compositions prepared by mixing cement with a stabilized finely dispersed slag suspension, which allow improving the structural, physical and mechanical characteristics of the cement stone are considered. On the first day of hardening, the strength of modified specimens increased by 54%, at the grade age - by 43%, and the porosity decreased by 13.8 and 17.3%, respectively. The possibility of obtaining an injection solution for soil consolidation on the basis of Portland cement and a stabilized slag suspension with the concentration of a finely dispersed slag of 50 g/l is considered. Studies have shown that the injection solution under study has reduced viscosity and sedimentation, increased compressive strength. After 28 days of hardening, the strength was 14.2 MPa, which is higher than the recommended values ​​for consolidation of soil under the foundations (4-6 MPa), and at a concentrated load, for the base under the foundations of the columns (9-10 MPa). The data obtained allows considering an injection solution based on Portland cement and slag suspension for the use in the injection technology of soil consolidation.

scholarly journals Effect of complex modification on cement compositions

2018 ◽  
Vol 212 ◽  
pp. 01018
Author(s):  
Irina Enzhievskaya ◽  
Cyril Odintsov ◽  
Maxim Chekhlov
Keyword(s):  
High Performance ◽  
Mechanical Characteristics ◽  
Raw Materials ◽  
Ammonium Hydroxide ◽  
Joint Application ◽  
Cement System ◽  
Mineral Fillers ◽  
Mineral Additives ◽  
By Products ◽  
Physical And Mechanical Characteristics

The article deals with the modification of cement compositions by a complex of modifiers, including superplasticizers and finely dispersed mineral fillers (micro fillers), based on local raw materials and by-products of the industry, as well as being capable of improving the physical and mechanical characteristics of cement concretes and solutions. The expediency of joint application of finely dispersed fillers and superplasticizers for obtaining materials with high performance characteristics is shown. The studies described in the article are aimed at expanding the raw materials base of mineral additives in combination with superplasticizers and studying their behavior in the cement system. As finely dispersed mineral additives, the following were used in the work: ground limestone from the overburden from the Mazulsky deposit, waste from sawing the jadeite of the Kashkaraksky deposit, a pulverized fraction of waste from crushing the Berezovskoye gravel, and Novosibirsk microsilica. It is shown that the introduction of the waste from sawing jadeite into the composition of the cement, along with microsilica, leads to increasing strength at bending and compression at 28 days. In the process of manufacturing a concrete and mortar mixture with the addition of limestone flour, increased gas emission was visually observed. The interaction was observed between the finely dispersed limestone flour with additives of plasticizing effect with the observed emission of complex gases, such as ammonium hydroxide, ammonium nitrate, and others.

scholarly journals FLUORO​AN​HYDRITE COMPOSITIONS PLASTICIZED BY POLYCARBOXYLATE ESTERS

2020 ◽  
Vol 11 (3) ◽  
pp. 101-105
Author(s):  
Daria A. Kalabina ◽  
Grigorij I. Yakovlev ◽  
Zdenek Dufek ◽  
Grigoriy N. Pervushin ◽  
Kirill A. Bazhenov ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Mechanical Characteristics ◽  
Water Resistance ◽  
Microstructural Analysis ◽  
High Strength ◽  
Expanded Perlite ◽  
Fluid Mixtures ◽  
Water Base ◽  
Physical And Mechanical Characteristics

The influence of a plasticizer based on polycarboxylate esters on the properties of a high-strength fluoroanhydrite composition and a lightweight composition with expanded perlite sand is investigated. It was shown that the addition of 2% polycarboxylate esters on water base to compositions has increased compressive strength and a flexural strength up to 46% and 20% respectively compare to composite without any additives. Due to the structure’s compaction of the compositions, water absorption decreased and the water resistance of the material increased. Microstructural analysis of the compositions confirmed the improvement of physical and mechanical characteristics by changing the morphology of crystallohydrate formations, increasing the contact area between new formations and modifying the structure by carbon nanotubes. The developed mixtures are supposed to be apply for self-leveling fluid mixtures for floors with reduced thermal conductivity.

scholarly journals NON-PLASTIC RAW MATERIALS FOR THE PRODUCTION OF CONSTRUCTION CERAMICS

2020 ◽  
Vol 3 (4) ◽  
pp. 31-38
Author(s):  
V. Men'shikova ◽  
L. Demina
Keyword(s):  
Raw Materials ◽  
Earth Metal ◽  
High Strength ◽  
Ceramic Materials ◽  
Component Composition ◽  
Magnesium Carbonate ◽  
Raw Material ◽  
Building Ceramic ◽  
Alkaline Earth Metal Oxides ◽  
The Cost

research by some scientists shows that the most expensive element in the manufacture of construction ceramics are clay materials, in particular kaolins. They allow getting products with high strength, but at the same time increase significantly the mass refractoriness. In this connection, a significant amount of melt is added or the firing temperature is increased. Of course, this leads to an increase in the cost of products. In Russia, the reserves of these raw materials are insufficient and it is advisable to look for new non-traditional types of raw materials. There is a need to adjust the component composition of ceramic masses and use non-plastic raw materials. An example is natural wollastonites or their analogues in the form of diopside, which are a little-used type of mineral raw material. In the Siberian region, there are several deposits of non-plastic varieties of raw materials for the production of fired construction products. The most famous are the deposits of the Slyudyansky and Sayan districts. The authors present the results of analysis of diopside rocks, where the chemical, mineral compositions and behavior of samples under heating are studied. The absence of alkali and alkaline earth metal oxides in diopsides was determined. The content of iron oxide in the amount of 0.1% indicates the purity of the raw material. More than half of the composition is occupied by silica, which is 53% and 58% in the rocks of the Burutuysky and Sayan deposits, respectively. The basis of the mineral composition of the samples is diopside, with the presence of quartz, calcite, mica and magnesium carbonate. This range of minerals is traditional in many charges of ceramic materials. Therefore, the possibility of using diopside rocks in the production of building ceramic materials is quite high.

Obtaining low-energy cement from industrial raw material

2020 ◽  
pp. 34-40
Author(s):  
N. N. Zhanikulov ◽  
B. T. Taymasov ◽  
I. N. Borisov ◽  
M. S. Dauletiyarov ◽  
M. Zh. Aitureev ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Raw Materials ◽  
Low Energy ◽  
Raw Material ◽  
Pyrite Cinder ◽  
Clay Component ◽  
Free Cao ◽  
Technogenic Raw Materials ◽  
Physical And Mechanical Characteristics

The results of obtaining Portland cement by lowenergy technology using technogenic raw materials are presented. Coal wastes and tephritobasalt in a ratio of 1: 1 were used as the clay component, instead of scarce pyrite cinder, granular lead slags were used. The regularities of the influence of the compositions of the blends, saturation coefficient, silicate and alumina modules, firing modes on the chemical and mineral composition and quality of clinker and cement are established. The composition of the raw mixes was calculated according to the ROCS program, the content of free CaO in the clinker was determined. The strength of experimental cement was tested after 7 and 28 days of hardening. Its physical and mechanical characteristics and structure were studied.

scholarly journals Effect of pulp consistency during refining on physical and mechanical characteristics of handsheets

2021 ◽  
Vol 2094 (5) ◽  
pp. 052035
Author(s):  
A V Ushakov ◽  
Y D Alashkevich ◽  
VA Kozhukhov ◽  
R A Marchenko
Keyword(s):  
Mechanical Characteristics ◽  
Paper Industry ◽  
High Strength ◽  
Strength Properties ◽  
Main Requirement ◽  
Pulp Consistency ◽  
Breaking Length ◽  
The Moment ◽  
Paper Product ◽  
Physical And Mechanical Characteristics

Abstract At the moment, the pulp and paper industry produces a wide variety of types of paper and board, which can serve as an alternative to plastic packaging products. The main requirement for paper packaging is high strength properties, which include: breaking length, resistance to breaking, bursting and tearing. The required strength properties can be ensured at the stage of refining the semi-finished product from which the paper product will be made by changing the consistency of the pulp. Since the influence of the consistency of the pulp during refining on the strength characteristics of the finished product has not been fully studied, it was of interest to find out how the strength properties of castings change when refining the pulp with a change in concentration.

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