Quick Setting Composition Based on Steelmaking Metallurgical Slag

2017 ◽  
Author(s):  
Alsu Khamatova ◽  
Vadim Khozin ◽  
Oleg Khohryakov ◽  
Grigory Yakovlev
Keyword(s):  
Mechanical Characteristics ◽  
Setting Time ◽  
Chemical Study ◽  
Electric Steelmaking ◽  
Steelmaking Slag ◽  
Structure And Properties ◽  
Slag Dump ◽  
Physical And Chemical ◽  
Short Setting Time ◽  
Physical And Mechanical Characteristics

The article deals with the problem of utilizing steelmaking slag from the production of rapid hardening composition in Izhstal, CJSC (Izhevsk, Russia), determining its physical and mechanical characteristics, and applying its properties for renovation and reconstruction. The physical and mechanical characteristics of the developed mortar exceed the existing analogues in many parameters (setting speed, strength). Dry mortar has a short setting time (the end of setting occurs 3,5 minutes after mixing with water at W/S = 0,3), its strength being 66,8 MPa after 28 days of normal hardening. The results show this mortar can be used for emergency renovation work to stop leaks in concrete, stone and brick structures. The studies were conducted using the methods of physical and chemical study of the structure and properties of the produced composition. The developed composition helps reduce the environmental pressure in places of electric steelmaking slag dump.

Effect of Hardening Accelerators and other Chemical Admixtures on the Properties of a Quick-Setting Mixture

2018 ◽  
Vol 276 ◽  
pp. 116-121 ◽  
Author(s):  
Alsu Khamatova ◽  
Grigory Ivanovich Yakovlev ◽  
Vadim Khozin ◽  
Grigory Nikolaevich Pervushin
Keyword(s):  
Mechanical Properties ◽  
Setting Time ◽  
Physicomechanical Properties ◽  
Electric Steelmaking ◽  
Steelmaking Slag ◽  
Strength Gain ◽  
Short Term ◽  
Fine Grained ◽  
Chemical Admixtures ◽  
Gypsum Content

The physicochemical and physicomechanical properties of quick-setting compositions based on fine-grained electric steelmaking slag (ESS) produced by Izhstal PJSC, Russia, have been examined. The study also focuses on the processes of interaction of the components of the compositions based on ESS in combination with hardening accelerators (Li2CO3, K2SO4) and plasticizing additives (SP-1, Melflux 2651F). It has been found that mechanoactivation of the composition improves the hydration in comparison with chemical admixtures. This can be proved by the obtained results of the setting and testing timing of the mechanical properties of the mixture. Plasticizers being added, the setting time increases at the average by 2.3 times, and accelerators being added, by 2 times compared with the mechanically activated composition. The influence of mechanoactivation on the strength of the compositions has been described. In comparison with the plasticized composition, the strength increases by 10%, while using accelerators – by 30%. Thus, the most effective way of producing a dry mixture with the properties of quick setting and hardening is a short-term mixed grinding of all its components, which makes it possible to exclude accelerating chemical admixtures and plasticizing additives in the mixture. Also, grinding positively affects the strength gain of quick-setting compositions while reducing the gypsum content to 5%.

Effect of Slag Content and Hardening Accelerator Dosage on the Physico-Mechanical Properties of Cement and Concrete

2011 ◽  
Vol 324 ◽  
pp. 392-395
Author(s):  
Riad Derabla ◽  
Imen Mokrani ◽  
Mohamed Larbi Benmalek
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Mechanical Characteristics ◽  
Setting Time ◽  
Absorption Capacity ◽  
Early Age ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag ◽  
Physical And Mechanical Characteristics

Our contribution consists at the study of the effect of (0 %, 0.2 % and 0.34 %) dosage of an hardening accelerating plasticizer (Plastocrete 160, produced by Sika Aldjazair) on the properties of normal mortar and concretes prepared with portland cement artificial of Hadjar Soud cement factory (Skikda – Algeria) with addition of (10 % and 20 %) of granulated blast furnace slag finely crushed of the El Hadjar blast furnace (Annaba - Algeria). The tests are focused to the physical and mechanical characteristics of elaborated materials to knowing: setting time, porosity, water absorption capacity and the test of compressive strength at 2, 7 and 28 days. The results obtained show clearly the reliability of the additive used to accelerate the hardening and to obtain high strengths at early age, which increase by increasing of the additive dosage. For the slag, its low hydraulic capacity does not make it profitable than at the long term (beyond 28 days).

scholarly journals REVIEW OF THE PHYSICAL AND MECHANICAL CHARACTERISTICS OF POLYURETHANE NANOCOMPOSITES

2021 ◽  
pp. 23-31
Author(s):  
R. A. Alekhina ◽  
V. E. Slavkina
Keyword(s):  
Mechanical Properties ◽  
Uniform Distribution ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
Physicomechanical Properties ◽  
Nano Composites ◽  
Structure And Properties ◽  
Polyurethane Composites ◽  
Polyurethane Nanocomposites ◽  
Physical And Mechanical Characteristics

Polyurethane nanocomposites are promising materials in many industries, they have superior physical and mechanical properties compared to the original polyurethane. This paper presents an analysis of the physical and mechanical properties of polyurethane nano-composites with various types of fillers such as organoclays, carbon nanotubes, polyhedral oligomeric silse-squioxanes, graphene, graphene oxide, polytetrafluoroethylene, and metal nanoparticles. The concentration-dependent effects in changing the structure and properties of polyurethane composites under the influence of the added fillers were also considered. It is noted that the values of physical and mechanical properties are influenced by the uniform distribution of nanofiller particles in the composite and their chemical modification. It was found that with a uniform distribution of nanoparticles in the polymer matrix, the physicomechanical properties of the resulting composites increase.

scholarly journals POTENTIAL OF MACAUBA EPICARP (Acrocomia aculeata (Jacq.) Lodd. ex Martius) FOR BRIQUETTES PRODUCTION

FLORESTA ◽  
2018 ◽  
Vol 48 (4) ◽  
pp. 563
Author(s):  
Vinícius Lima Teixeira ◽  
Angélica De Cássia Oliveira Carneiro ◽  
Anderson Barbosa Evaristo ◽  
Bruno De Freitas Homem de Faria ◽  
Danilo Barros Donato ◽  
...  
Keyword(s):  
Energy Density ◽  
Mechanical Characteristics ◽  
Chemical Properties ◽  
Energy Market ◽  
Production Chain ◽  
Solid Biofuels ◽  
Different Temperatures ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Physical And Mechanical Characteristics

Briquetting is a form to aggregate value in the biomass production chain, to re-use sustainably waste and to provide high-quality solid biofuels, as well as to enable the development of the energy market. The aim of this study was to evaluate the potential of the production of briquettes from epicarp waste of macauba fruit and verify the influence of different temperatures and compaction pressures on the chemical, physical, and mechanical characteristics of the briquettes. The epicarp was reduced to particles and, then classified, dried, and characterized for their physical and chemical properties. The briquettes were produced by using compression pressures of 62, 83, and 103 bar and temperatures of 90 and 120 °C. The effect of these factors upon the variables studied was verified through regression analysis. The increase of pressure and temperature contributed to greater mass loss of the briquettes. Apparent density and energy density increased due to temperature rise. High values of energy density were obtained, which demonstrates the potential of the macauba fruit epicarp to produce briquettes for generation of thermal energy

The Influence of Physical Parameters on the Mechanical Characteristics of Some Volcanic Magmatic Rocks of the Andesite Type

Mining Revue ◽  
2021 ◽  
Vol 27 (2) ◽  
pp. 30-41
Author(s):  
Ciprian Danciu ◽  
Diana Marchiș ◽  
Simona Cucăilă
Keyword(s):  
Mechanical Characteristics ◽  
Strength Characteristics ◽  
Physical Parameters ◽  
Internal Factors ◽  
Hard Rocks ◽  
Magmatic Rocks ◽  
Mineral Components ◽  
Chemical Factors ◽  
Physical And Chemical ◽  
Physical And Mechanical Characteristics

Abstract The factors that influence the strength characteristics of rocks can be different in nature, being divided into external and internal factors. The mechanical properties of hard rocks are a result of geological, physical and chemical factors. In order to highlight the physical parameters that influence the strength characteristics of the rocks, in this paper there were analyzed six types of volcanic magmatic rocks such as andesites. In terms of stress behavior, rocks are directly influenced by their physical properties, such as volumetric density, porosity, compactness, moisture and the degree of alteration of mineral components. For this purpose, several sets of tests were performed to determine the physical and mechanical characteristics of the rocks, based on which it was possible to analyze how the physical parameters influence the strength characteristics.

scholarly journals The structure formation features of gypsum-lime composite binders for non-autoclaved aerated concrete

2021 ◽  
Vol 4 (1) ◽  
pp. 60-65
Author(s):  
B. B. Chekanskyi ◽  
◽  
I. V. Lutsyuk ◽  
V. R. Pastushok ◽  
◽  
...  
Keyword(s):  
Structure Formation ◽  
Calcium Sulfate ◽  
Mechanical Characteristics ◽  
Xrd Analysis ◽  
Formation Processes ◽  
Calcium Sulfate Dihydrate ◽  
Aerated Concrete ◽  
Physical And Chemical ◽  
The Relationship ◽  
Physical And Mechanical Characteristics

The crystalline phases of hydration products of the gypsum-lime binder were identified using XRD analysis. The physical and chemical regularities of the structure formation processes in the model system “gypsum – quicklime – metakaolin – amorphous silica – water – borax” were established. The influence of the quicklime type and gypsum binder brand on the morphology and the size of the calcium sulfate dihydrate crystals were investigated. The relationship between processesof the structure formation of composite gypsum-lime binders under normal hardeningconditions and the physical and mechanical characteristics of the stone was established.

BENCH DESIGN AND STUDY OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF A TEAT CUP LINER WITH ANTIBACTERIAL FILLER

2020 ◽  
pp. 22-26
Author(s):  
YURY G. IVANOV ◽  
◽  
YELENA V. MASHOSHINA ◽  
LYUDMILA N. VERLIKOVA ◽  
DARIA G. GELETIY ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Physical And Mechanical Characteristics

Discharge-pulse Geotechnical Electro Discharge Technology of Bases Strengthening

2020 ◽  
Vol 787 (12) ◽  
pp. 63-65
Author(s):  
N.S. Sokolov
Keyword(s):  
Bearing Capacity ◽  
Mechanical Characteristics ◽  
Discharge Pulse ◽  
Zero Values ◽  
Traditional Technologies ◽  
Negative Friction ◽  
Geotechnical Problems ◽  
Physical And Mechanical Characteristics

The problem of increasing the bearing capacity of the base is an relevant problem in modern geotechnical construction. When significant loads are transmitted to the base, the use of traditional technologies is not always justified. Often there is an urgent need to use non-standard ways to strengthen the bases. In many cases, the geotechnical situation is aggravated by the presence of weak underlying layers with unstable physical and mechanical characteristics in engineering-geological sections. When strengthening such bases with the help of traditional piles, the latter can get negative friction, which significantly reduces their bearing capacity on the ground, sometimes reaching zero values. This may lead to additional precipitations of the objects being constructed and constructed in the zone of geotechnical influence. The use of ERT piles in most cases successfully solves many complex geotechnical problems.

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. 

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