scholarly journals THE IMPACT OF PRESCRIPTION-TECHNOLOGICAL FACTORS ON PHYSICO-MECHANICAL CHARACTERISTICS OF FINE-GRAINED CONCRETE WITH THE CARBON PHASE

2016 ◽  
Vol 2 (1) ◽  
pp. 130-133
Author(s):  
Лопанов ◽  
Aleksandr Lopanov ◽  
Фанина ◽  
Evgeniya Fanina ◽  
Томаровщенко ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Cement Matrix ◽  
Carbon Phase ◽  
Cement Ratio ◽  
Technological Factors ◽  
Fine Grained ◽  
Cement Binder ◽  
The Impact ◽  
Physical And Mechanical Characteristics ◽  
Modifying Additive

The article presents the research results of physical and mechanical characteristics of carbon-containing resistive materials based on cement binder. The regulation limit of the compressive strength of the composites was carried out using mechanochemical methods. Synthesized modifying additive on the basis of ether polycarboxylates, salts of iron and of shungite to reduce water-cement ratio and permeability of conductive fine-grained concrete, as well as to improve the strength characteristics of the compositions. Studied the morphology of tumors in the cement matrix.

STUDYING THE IMPACT OF MODIFICATING ADDITIVES ON THE PHYSICAL AND MECHANICAL CHARACTERISTICS OF THE HYPROFIBER MATERIALS

2018 ◽  
Vol 133 ◽  
Author(s):  
Bunyod Gayratovich Igamberdiev ◽  
◽  
Rolan Sobirovich Yulyakshiev ◽  
Sadokat Abdullazhonovna Karimova ◽  
◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
The Impact ◽  
Physical And Mechanical Characteristics

scholarly journals STUDY OF THE INFLUENCE OF FIBERS MADE OF DIFFERENT MATERIALS ON PHYSICO-MECHANICAL CHARACTERISTICS OF FINE-GRAINED CONCRETE

2020 ◽  
Vol 2018 (1) ◽  
pp. 115-118
Author(s):  
Al'bina Baranova ◽  
Margarita Badenikova ◽  
Anna Bobrova ◽  
Kristina Rudyh
Keyword(s):  
Mechanical Characteristics ◽  
Fine Grained ◽  
Physical And Mechanical Characteristics

The article presents the results of research of physical and mechanical characteristics of fine-grained concrete with different percentage of fiber made of different materials.

scholarly journals On ways to increase protection of special structures from impact action

2021 ◽  
pp. 52-57
Author(s):  
Andriy Andrukhiv ◽  
Andriy Baranov ◽  
Nadiia Huzyk ◽  
Bohdan Sokil ◽  
Mariia Sokil
Keyword(s):  
Mechanical Characteristics ◽  
Dynamic Effect ◽  
External Action ◽  
Engineering Structures ◽  
Discrete Function ◽  
Impact Action ◽  
Protective Element ◽  
Protective Structures ◽  
The Impact ◽  
Physical And Mechanical Characteristics

The technique of research of dynamic processes of elements of engineering constructions of special purpose from explosive action of projectiles is developed. Elastically reinforced beams with hinged ends were chosen for the physical model of elements of engineering structures. It is assumed that the elastic properties of the latter satisfy the nonlinear technical law of elasticity. A mathematical model of the process of a series of impact actions of projectiles at different points of the element of the protective structure is constructed. The latter is a boundary value problem for a partial differential equation. Its peculiarity is that the external dynamic action is a discrete function of linear and time variables. To determine the dynamic effect of a series of impacts on the object under study, and thus the level of protection of the structure, the basic ideas of perturbation theory methods are extended to new classes of systems. This allowed to obtain an analytical dependence of the deformation of the elastically reinforced element on the basic physical and mechanical characteristics of the material of the protective element, its reinforcement and the characteristics of the external action of the projectiles. It is shown that the most dangerous cases, given the security of the structure, are those when the impact is repeated at equal intervals, in addition, the point of impact is closer to the middle of the protective element. The obtained theoretical results can be the basis for selection at the stage of designing the main physical and mechanical characteristics of the elements of engineering structures and their reinforcement in order to reliably protect personnel and equipment from the maximum possible impact on it of the shock series of projectiles. The reliability of the obtained results is confirmed by: a) generalization of widely tested methods to new classes of dynamical systems; b) obtaining in the limit case the consequences known in scientific sources concerning the linearly elastic characteristics of the elements of protective structures; c) their consistency with the essence of the physical process itself, which is considered in the work.

The Fiber-Reinforced Concrete Constructions Experimental Research

2018 ◽  
Vol 931 ◽  
pp. 598-602 ◽  
Author(s):  
Sergey V. Klyuev ◽  
Tolya A. Khezhev ◽  
Yu.V. Pukharenko ◽  
A.V. Klyuev
Keyword(s):  
Chemical Composition ◽  
Mechanical Characteristics ◽  
Steel Fiber ◽  
Fiber Reinforced Concrete ◽  
Steel Fibers ◽  
High Quality ◽  
Fine Grained ◽  
Fibre Concrete ◽  
Operational Characteristics ◽  
Physical And Mechanical Characteristics

The article proves the efficiency of the construction-based use of fibre concrete. The technique of high-quality fine-grained fibre concrete creation is presented. The chemical composition of the binder was studied and the physical and mechanical characteristics of the filler were revealed. 2 types of steel fibers were studied: anchor and in the form of a fir-tree. The conducted studies proved the effectiveness of dispersed reinforcement with steel fiber. It is established, that the usage of fiber in the form of a fir-tree the greatest increase of operational characteristics is reached.

Fiber Concrete on the Basis of Composite Binder and Technogenic Raw Materials

2018 ◽  
Vol 931 ◽  
pp. 603-607 ◽  
Author(s):  
Sergey V. Klyuev ◽  
Tolya A. Khezhev ◽  
Yu.V. Pukharenko ◽  
A.V. Klyuev
Keyword(s):  
Mechanical Characteristics ◽  
Raw Materials ◽  
Mining Waste ◽  
Composite Binder ◽  
Fine Grained ◽  
Fibre Concrete ◽  
Concrete Production ◽  
Fiber Concrete ◽  
Technogenic Raw Materials ◽  
Physical And Mechanical Characteristics

In the article the questions of application of the mining waste: dropout of quartzite sandstone crushing as filler in the fibre concrete production were considered. Composite binders based on cement and dropout of quartzite sandstone crushing were also developed. The effectiveness of composite binders’ usage consisting in improving the physical and mechanical characteristics and reduction of their prime cost compared to the cement with a slight increase in the complexity of their production was proved. The compositions of concrete dispersed reinforced with steel wave fiber and without it were developed. The efficiency of the use of dispersed reinforcement of fine-grained concrete is proved, which consists in improving the performance characteristics.

Experimental Study of Fiber-Reinforced Concrete Structures

2019 ◽  
Vol 945 ◽  
pp. 115-119 ◽  
Author(s):  
Sergey V. Klyuev ◽  
T.A. Khezhev ◽  
Yu.V. Pukharenko ◽  
A.V. Klyuev
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Chemical Composition ◽  
Mechanical Characteristics ◽  
Steel Fibre ◽  
Fiber Reinforced Concrete ◽  
Reinforced Concrete Structures ◽  
Fine Grained ◽  
Fiber Concrete ◽  
Physical And Mechanical Characteristics

Acute questions of steelfiber using for disperse-reinforced fine-grained concrete are considered in the article. Researchers of steelfiber concrete patterns are held. The efficiency of using crushing dropout of quartzitic sandstone is proven. The article studies the physical and mechanical characteristics of the filler. The chemical composition of the binder is presented. For dispersed reinforcement of fine concrete the influence of steel fibre on the strength characteristics of the mixture was studied. The characteristics of the fiber and the technology of obtaining a fiber-concrete mixture are presented. Studies showed the effectiveness of steel fibre with a percentage of 3% and a cement-sand ratio of 1/3.

Activity Improvement of Sticky Portland Cements by Methods of Mechanical Activation

2019 ◽  
Vol 945 ◽  
pp. 3-8 ◽  
Author(s):  
A.V. Andreeva ◽  
O.N. Burenina ◽  
M.E. Savvinova
Keyword(s):  
Mechanical Activation ◽  
Ball Mill ◽  
Granulometric Composition ◽  
Mechanical Characteristics ◽  
Physical And Mechanical Properties ◽  
Surface Characteristics ◽  
Fine Grained ◽  
Wide Range ◽  
Grinding Machines ◽  
Physical And Mechanical Characteristics

The article presents experimental data on the improvement of physical and mechanical properties and structure of fine-grained concrete by mechanical activation of sticky cement in various apparatuses. It is established that the use of mechanoactivation technologies allows controlling the surface characteristics of cement in a wide range, its granulometric composition, as well as the physical and mechanical characteristics of concrete products. It is revealed that the efficiency of grinding machines that realize various mechanisms of disperse action is not the same. The highest indexes belong to the concrete containing cement, which is mechanically activated on the planetary ball mill AGO-2.

The Influence of Chrysotile Nanofibers Dispersion on the Physical and Mechanical Properties of the Cement Matrix

2021 ◽  
Vol 325 ◽  
pp. 21-27
Author(s):  
Grigory Ivanovich Yakovlev ◽  
Rostislav Drochytka ◽  
Valery Grakhov ◽  
Zarina S. Saidova ◽  
Irina Sergeevna Polyanskikh ◽  
...  
Keyword(s):  
Reference Sample ◽  
Physical And Mechanical Properties ◽  
Particle Size Analysis ◽  
Steam Treatment ◽  
Cement Matrix ◽  
Size Analysis ◽  
Fine Grained ◽  
Calcium Silicate Hydrates ◽  
Cement Binder ◽  
Positive Effect

The article describes the influence of chrysotile nanofibers dispersion introduction on the properties of the cement matrix. Comparison of the dispersion level of suspensions obtained using cavitation and ultrasonic processing methods is presented. The positive effect of chrysotile fibers application on the strength characteristics of the material has been confirmed. A 34% increase in the compressive strength of the samples was achieved on the 7th day of hardening, while on the 28th day it increased by 36% and with the steam treatment - by 38% compared to the reference sample. Laser particle size analysis confirmed the predominance of the nanosized component of chrysotile fibers in the suspension, which affected the structuring of the cement matrix. The results of the differential thermography, IR spectrometry, X-ray microanalysis and scanning electron microscopy of the samples are also presented. The analysis methods confirmed that introduction of chrysotile nanofibers suspension into the composition of a cement binder makes it possible to significantly vary the structure and morphology of new formations in fine-grained concrete. It also changes the quantitative and qualitative phase composition of the material with the formation of calcium silicate hydrates of lower basicity, leading to an increase in the strength of cement concrete.

Coefficients for Calculation of Deformation-Strength Characteristic of Concrete for Injection with Two-Stage Expansion

2018 ◽  
Vol 284 ◽  
pp. 922-928
Author(s):  
G.V. Nesvetaev ◽  
Y.I. Koryanova ◽  
T.N. Zhilnikova
Keyword(s):  
Portland Cement ◽  
Aggregate Size ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Technological Factors ◽  
Several Variables ◽  
Concrete Admixtures ◽  
Function Of Several Variables ◽  
The Impact ◽  
Kinetics Of

Strength of concrete is a function of several variables, such as: water / cement ratio, portland cement activity, filler quality, etc., adjusting which you can achieve the required strength. However, the introduction of the concrete admixtures, changing holding conditions of the samples, the volume restriction can affect the strength of the due to exposure impacts both the kinetics of hydration processes and on the structure formation of cement paste. The article presents the results of investigation the influence of the amount of gas-forming admixture, the presence, type and amount of superplasticizer, the ratio sand / cement, aggregate size and water-cement ratio on gassing and expansion of the mixture in the first stage and propose coefficient of effectiveness of gassing and of expansion. The authors proposed a formula to describe the dependence of the relative deformations of expansion of the concentration of aggregate. In order to assess the conditions in which there is a mixture, it is proposed to use the indicator - coefficient of congestion of expansion, to account for the influence of hardening conditions on the strength of the concrete - coefficient hardening conditions. The authors proposed to consider the impact of prescription and technological factors by introducing system of correction coefficients.

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