Computer simulation of the strength processes of mechanically activated concrete mixtures

Dmitrieva, M. A.; Leitsin, V. N.; Sharanova, A. V.

doi:10.1063/1.5131939

Cited by 3 publications

(4 citation statements)

References 8 publications

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“…In [19], an approach to determining the parameters of the macro kinetics of concrete setting through the kinetic characteristics of hardening at different temperatures was discussed. The activating nature of concrete hydration processes has been confirmed experimentally.…”

Section: Of 19mentioning

confidence: 99%

“…The activating nature of concrete hydration processes has been confirmed experimentally. Furthermore, a computer simulation of the formation of concrete strength made it possible to forecast the structure and properties of concrete at the early stages of hardening [19].…”

Section: Of 19mentioning

confidence: 99%

“…In studies [6][7][8][9]18,19,[31][32][33], activated cement, or activated mortar part was intended for heavy concrete and aerated concrete; in particular, this is shown in the works of the authors of the scientific school under the leadership of A.I. Shuyskiy [34].…”

Section: Influence Of the Processing Of Cement-sand Mortar In The Vla...mentioning

confidence: 99%

“…The essence of activation is to increase the specific surface area of materials with a simultaneous increase in surface energy, which increases the reactivity of the cement binder. The disadvantages of the dry method of activating cement include the processing time, which can reach several hours, the high energy consumption of the equipment and its low productivity, and the short terms and complexity of the activated cement storage [10,[19][20][21][22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Section: Of 19mentioning

confidence: 99%

Section: Of 19mentioning

confidence: 99%

Section: Influence Of the Processing Of Cement-sand Mortar In The Vla...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Approach to computer modeling of concrete mix hydration processes

Dmitrieva

Leitsin

Tovpinets

et al. 2022

AIP Conference Proceedings

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Моделирование Связанных Процессов, Сопровождающих Набор Ранней Прочности Цементной Полифракционной Системой

Дмитриева,

Лейцин,

Когай

et al. 2024

Comp. Contin. Mech.

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Numerical simulation of changes in the structure of cement composites performed for a wide range of varying factors makes it possible to develop optimal technological modes for producing concrete with desired characteristics. The complexity of physical and chemical processes, by which concrete gains strength, contributes to the development of various model approaches, each of which has a number of limitations. In this paper, the model of coupled processes in reacting media is modified to describe the structural changes of cement stone in the presence of fine polyfractional inert aggregate in the early stages of strength gain (hydration). It is believed that the initial blend after mixing with water has a macroscopic structure. The maximum achievable packing density of fine inert filler helps to improve the mechanical and microstructural characteristics of concrete and is ensured, in turn, by the optimal choice of the proportions of individual fractions in the entire volume of filler (sand). The material throughout the considered volume is assumed to be a heterogeneous medium that is based on both reactive components and inert substances of different concentrations, including pores. The possibility of forming a substructure of contacting particles of inert filler at various hierarchical levels is taken into account. The characteristics of cement are set in accordance with the mass fractions of clinker minerals that contribute to the hydration activity of the binder. Thermal processes are described by two temperature heat balance equations, which are solved by the finite difference method using the central difference scheme. At a time of heating the volume of the mixture caused by the exothermicity of a hydration reaction, the problems of macrokinetics and filtration are solved. Macrokinetic transformations are found in terms of the activation energy determined by isothermal calorimetry during cement setting at temperatures of 20, 30 and 40°С. Forced filtration of the liquid phase is assessed taking into account the capillary pressure caused by the peculiarities of the pore structure formation of cement stone.

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Computer simulation of the strength processes of mechanically activated concrete mixtures

Cited by 3 publications

References 8 publications

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

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

Approach to computer modeling of concrete mix hydration processes

Моделирование Связанных Процессов, Сопровождающих Набор Ранней Прочности Цементной Полифракционной Системой

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