scholarly journals INFLUENCE OF STEEL FIBER ON STRENGTH AND DEFORMATION PROPERTIES OF FIBER CONCRETE MIXTURE

2019 ◽  
pp. 63-69
Author(s):  
S.P. Neutov ◽  
◽  
I.B. Korneieva ◽  
Keyword(s):  
Steel Fiber ◽  
Concrete Mixture ◽  
Deformation Properties ◽  
Fiber Concrete ◽  
Strength And Deformation

Method for Manufacturing of Fiber-Concrete Mixture for Fencing Structure Blocks

2019 ◽  
Vol 974 ◽  
pp. 201-205
Author(s):  
V.A. Perfilov ◽  
Vladimir I. Lepilov
Keyword(s):  
Electromagnetic Field ◽  
Steel Fiber ◽  
Thermal Characteristics ◽  
Concrete Mixture ◽  
Basalt Fibers ◽  
Modifying Agent ◽  
Ferromagnetic Component ◽  
Bonding Material ◽  
Fiber Concrete

The authors offered a method for manufacturing concrete mixture with preliminary mixing of bonding material, modifying agent and basalt fibers in AC electromagnetic field using steel fiber as ferromagnetic component. The obtained fiber concrete was used for fencing with improved thermal characteristics.

Fiber Concrete for Industrial and Civil Construction

2019 ◽  
Vol 945 ◽  
pp. 120-124 ◽  
Author(s):  
Sergey V. Klyuev ◽  
T.A. Khezhev ◽  
Yu.V. Pukharenko ◽  
A.V. Klyuev
Keyword(s):  
Steel Fiber ◽  
Building Structures ◽  
Deformation Characteristics ◽  
Fine Grained ◽  
Fiber Concrete ◽  
Concrete Mix ◽  
Strength And Deformation ◽  
Reinforcing Fiber ◽  
Industrial Sand ◽  
Optimal Type

In the article the questions of application of a steel fiber for disperse reinforcing of fine-grained concrete are considered. Main filler of a fiber concrete mix was the KMA industrial sand enriched with sand. The carried-out researches showed advantage of a steel wave fiber before the anchor and flat milled. The optimal type of fiber is revealed, in which the greatest increase of strength and deformation characteristics is observed. Thus, it can be concluded that the type of steel reinforcing fiber and its shape have a significant impact on the length of building structures and buildings as a whole.

Recipe and Technological Factors’ Influence on Vibrocentrifuged Basalt Fiber Concrete Strength and Deformation Properties

2021 ◽  
Vol 1043 ◽  
pp. 15-25
Author(s):  
Levon Maylyan ◽  
Sergey Stel'makh ◽  
Evgeniy Shcherban' ◽  
Alla Smolyanichenko ◽  
Diana El'shaeva
Keyword(s):  
Vibration Mode ◽  
Concrete Strength ◽  
Basalt Fiber ◽  
Fiber Reinforcement ◽  
Technological Parameters ◽  
Technological Factors ◽  
Deformation Properties ◽  
Fiber Concrete ◽  
Aggregate Fractions ◽  
Strength And Deformation

In order to optimize the basalt-fiber-concrete mixtures compositions, as well as to determine the most effective technological parameters in vibrocentrifugation technology, a compositional plan of experiments has been developed. Within the framework of the proposed experimental setup for creating vibrocentrifuged samples of annular cross-section with a variatropic structure, the following technological factors have been identified and considered: the clamps’ technological protrusions height; vibration mode (asynchronous - A, punctuational - P, synchronous - S). The clamps’ technological protrusions height varied within the following limits: 2.5 mm; 5 mm; 10 mm. The change in the percentage of coarse aggregate fractions and the percentage of fiber reinforcement was considered as the prescription factors. The percentage of fiber reinforcement varied within the following limits: 3.5%; four %; 4.5%. The content of fraction 5-10 in relation to fraction 10-20 varied within the following limits: 40 %; 50 %; 60 %. Based on the results obtained, it can be concluded that the most effective will be the use of clamps with a height of technological protrusions equal to 5 mm, with an alternating vibration mode, a percentage of fiber reinforcement equal to 4, and with a content of fractions of 5-10 mm and 10-20 mm equal percentage.

scholarly journals Numerical simulation of electric heating of dispersed-reinforced concrete with steel fibers

2021 ◽  
Vol 2131 (5) ◽  
pp. 052064
Author(s):  
E Matus ◽  
M Soppa
Keyword(s):  
Experimental Data ◽  
Thermal Conductivity ◽  
Reinforced Concrete ◽  
Steel Fiber ◽  
Electric Heating ◽  
Contact Layer ◽  
Concrete Mixture ◽  
Study Results ◽  
Fiber Concrete ◽  
Steel Fiber Concrete

Abstract Solution to the problem of current density distribution in a fragment of a steel fiber concrete mixture is obtained, using the finite element method. It is shown that the fiber-concrete contact layer makes a significant contribution to the effective electrical conductivity of the mixture. More than 50% of the total current flows through the reinforcing fibers. The conductivity of the mixture increases in proportion to the reinforcement coefficient. It increases 2-3 times, depending on the choice of the contact properties, reinforcing 2% by volume layer. Experimental data that confirm the indicated dependence are presented. Also, a solution to the problem of heat distribution in a fragment of steel-fiber-concrete mixture in stationary and non-stationary modes of external heating and electrode heating was obtained. It is shown that the effective thermal conductivity coefficient increases in proportion to the reinforcement coefficient. A significant effect of the contact layer parameters on thermal conductivity is shown, comparison with experimental data. Significant heat release in the area of contact zone and in fiber leads to a temperature rise in these zones by 20-30 degrees in a stationary mode. The temperature distribution in fiber-reinforced concrete during induction heating is considered. In this case, it is necessary to significantly increase the frequency of the current used. The study results can be used, prescribing electric heating modes for products made of dispersion-reinforced concrete.

The mechanical behavior of the Kettle Point oil shale

1986 ◽  
Vol 23 (1) ◽  
pp. 87-93 ◽  
Author(s):  
Maurice B. Dusseault ◽  
Matthias Loftsson ◽  
David Russell
Keyword(s):  
Oil Shale ◽  
Clay Content ◽  
Organic Content ◽  
Point Load ◽  
Brazilian Test ◽  
Point Load Strength ◽  
Triaxial Strength ◽  
Deformation Properties ◽  
Strength And Deformation ◽  
Oil Shales

Samples of eastern black shale (Kettle Point oil shales, Ontario) were subjected to extensive mineralogical and geomechanical tests. We prove that the mineralogy, as measured by the ratio of quartz to illite, controls strength and deformation properties, and the organic material plays no significant role. The reason is that increasing clay content dilutes the rigid quartz–quartz grain contacts that are responsible for the high strengths and stiff behavior. Tests of temperature effects on point load strength of another low organic content oil shale confirm that organic matter is not important to mechanical properties in matrix-supported shales. Key words: shale, mineralogy, Brazilian test, triaxial strength, organic content, slake durability, thermogravimetry.

Experimental Studies of Fiber-Reinforced Concrete under Axial Tension

2021 ◽  
Vol 1038 ◽  
pp. 323-329
Author(s):  
Zlata Holovata ◽  
Daria Kirichenko ◽  
Irina Korneeva ◽  
Stepan Neutov ◽  
Marina Vyhnanets
Keyword(s):  
Reinforced Concrete ◽  
Experimental Studies ◽  
Fiber Reinforced Concrete ◽  
Load Application ◽  
Fiber Reinforced ◽  
Large Aggregate ◽  
Second Stage ◽  
Axial Tension ◽  
Deformation Properties ◽  
Fiber Concrete

The design of a stand for testing concrete and fiber-reinforced concrete specimens-"eight" in tension, which provides axial load application and minimizes the effect of stress concentration at the ends of the specimen. The design of the stand is such that the distance between the axis of load application and the central hinge is 108 cm, and between this hinge and the axis of the test specimen is 21 cm, as a result of which the load transferred to the specimen is 5.143 times greater than the applied one. At the first stage of testing, it was found that the optimal characteristics of the fiber-concrete mixture is a matrix with a large aggregate ≤ 10 mm with 1.0% fiber reinforcement. At the second stage, the ultimate strength of fiber-reinforced concrete for axial tension was determined - 1.28 MPa when reinforced with wave fiber and 1.37 MPa when reinforced with anchor fiber, which amounted to 4.1% and 4.4% of compressive strength, respectively. It was also found that concrete reinforced with anchor fiber has higher deformation properties than concrete reinforced with wave fiber.

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