Investigation of Powder-Activated Concretes by Laser Interferometry Methods

Травуш, Владимир; Karpenko, N. I.; Erofeev, Vladimir; Erofeeva, I. V.; Maksimova, I. N.; Кондращенко, В. И.; KESARIYSKIY, A.G.

doi:10.31659/0585-430x-2020-780-4-5-18-28

Cited by 2 publications

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“…Compression and tension diagrams differ significantly in their parameters: concrete tensile strength is an order of magnitude less than compression. To construct diagrams of concrete deformation, we applied the method of constructing curvilinear diagrams [52]. To build a diagram, it is necessary to create an array of points, which is the dependence of the individual stress level, calculated through the entire algorithm for constructing a diagram of concrete deformation, taking into account the ascending or descending branch.…”

Section: Deformation Diagrams Of Concrete and Fiber-reinforced Concretementioning

confidence: 99%

Improving the Structural Characteristics of Heavy Concrete by Combined Disperse Reinforcement

et al. 2021

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The development of perspective concrete mixes capable of resisting the action of external loads is an important scientific problem in the modern construction industry. This article presents a study of the influence of steel, basalt, and polypropylene fiber materials on concrete’s strength and deformation characteristics. A combination of various types of dispersed reinforcement is considered, and by methods of mathematical planning of the experiment, regression dependences of the strength and deformation characteristics on the combination of fibers and their volume fraction are obtained. It was shown that the increase in compressive strength was 35% in fiber-reinforced concretes made using a combination of steel and basalt fiber with a volume concentration of steel fiber of 2% and basalt fiber of 2%; tensile strength in bending increased by 79%, ultimate deformations during axial compression decreased by 52%, ultimate deformation under axial tension decreased by 39%, and elastic modulus increased by 33%. Similar results were obtained for other combinations of dispersed reinforcement. The studies carried out made it possible to determine the most effective combinations of fibers of various types of fibers with each other and their optimal volume concentration.

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Section: Deformation Diagrams Of Concrete and Fiber-reinforced Concretementioning

confidence: 99%

Improving the Structural Characteristics of Heavy Concrete by Combined Disperse Reinforcement

et al. 2021

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“…In [17], the methods of laser holographic interferometry were used. Powder-activated concrete of the new generation in comparison with the materials of the old and transitional generations were considered as the studied ones.…”

Section: Of 19mentioning

confidence: 99%

“…Using laser interferometry, it was found that the introduction of micro-silica, especially in combination with amorphous-active microsilica, significantly postpones the onset of microcracking in cement samples. A specimen based on a cement-sand mortar without fine fillers is characterized by a lower level of cracking, while with an increase in the load, the fracture of the specimen has a block character [17].…”

Section: Of 19mentioning

confidence: 99%

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Improvement of Strength and Strain Characteristics of Lightweight Fiber Concrete by Electromagnetic Activation in a Vortex Layer Apparatus

et al. 2021

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The relevant problem of choosing effective materials for enclosing structures is compliance with the requirements of increased thermal resistance, reduced mass of buildings and structures, and reduced material consumption, labor intensity, and construction costs. These requirements are satisfied by structures made of lightweight fiber-reinforced concrete, which are the subject of attention of many scientists and engineers. One of the most rational requirements for industrial use is the activation of untreated components of the concrete mixture. This article is devoted to studying the influence of the activation of fiber-reinforced concrete elements in the vortex layer apparatus on concrete strength and structural characteristics. The effect of the raw component processing time of the concrete mixture on the strength and deformation characteristics of the lightweight fiber-reinforced concrete was studied. The optimal processing time for the cement–sand mortar in the VLA-75-85s was determined. It was shown that the activation of the vortex layer in the apparatus leads to an increase in strength from 27% to 61% and an improvement in the deformation characteristics of lightweight fiber-reinforced concrete by up to 12%. Furthermore, it was found that the use of activation in VLA leads to an increase in the coefficient of constructive quality for all experimentally determined strength characteristics of lightweight fiber-reinforced concrete by up to 27%.

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Investigation of Powder-Activated Concretes by Laser Interferometry Methods

Cited by 2 publications

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Improving the Structural Characteristics of Heavy Concrete by Combined Disperse Reinforcement

Improving the Structural Characteristics of Heavy Concrete by Combined Disperse Reinforcement

Improvement of Strength and Strain Characteristics of Lightweight Fiber Concrete by Electromagnetic Activation in a Vortex Layer Apparatus

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