Mechanoactivation of Portland cement in the technology of manufacturing the self­compacting concrete

Barabash, I.V.; Harashchenko, Darya

doi:10.15587/1729-4061.2018.133235

Cited by 4 publications

(4 citation statements)

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“…Analysis of experimental data indicates that at the age of 28 days the compressive strength of concrete on an activated binder is 2.5 ... 3.5 MPa higher than the strength of concretes of similar composition, prepared using traditional technology. It should be noted that the amount of basalt fiber slightly increases the strength of concrete, which is consistent with the research results [3][4][5]. Using the experimental data shown in table 1, ES-models of the fine-grained concrete composition variables influence on its abrasion were built:…”

Section: Source: Author's Illustrationsupporting

confidence: 85%

“…The factors that hinder the widespread introduction of fine-grained concrete into construction practice are its higher cost compared to ordinary concrete, as well as relatively low mechanical characteristics: compressive strength, wear resistance, shock resistance [2]. A significant reserve for improving the mechanical characteristics of finegrained concrete is its dispersed reinforcement, as well as the mechanical activation of Portland cement due to the use of high-speed mixers in the technology of preparing concrete mixtures [3][4][5][6][7]. It has been established that the introduction of basalt fiber into a fine-grained concrete mixture leads to a decrease in its mobility, which requires an increase in the amount of mixing water [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Vorokhaiev

Barabash

Ksonshkevych

et al. 2021

Croatian Regional Development Journal

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This article is devoted to the study of the mechanical properties of fine-grained concrete used for flooring in industrial and civil buildings. Characterized by the well-known advantages (unlimited raw material base, manufacturability, high homogeneity), fine-grained concrete requires an increased consumption of cement to achieve the necessary mechanical characteristics - compressive strength, abrasion, impact resistance. An alternative to the known technological method is proposed an intensive separate technology (IST) for preparing fine-grained concrete mixtures using a high-speed mixer-activator in the presence of hydrophobized basalt fiber and a polycarboxylate superplasticizer Relaxol-Super PC. The use of IST leads to an increase in the strength of fine-grained concrete in compression by 1.9 times, impact resistance by a factor of 2, and a decrease in abrasion by 40... 50% in comparison with the control. The relevance of using the technology of monolithic floors for industrial and civil construction is due to a wide range of varieties of Portland cement, the grain composition of aggregates, as well as the simplicity of the technology for preparing a fine-grained concrete mixture.

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Section: Source: Author's Illustrationsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Vorokhaiev

Barabash

Ksonshkevych

et al. 2021

Croatian Regional Development Journal

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“…This goal is achieved by the fact that the utility model "Device for intensification of fluid injection" is based on the task, which is based on the known technical solution "Device for spraying a fluid mixture", replacing the purpose of some elements by constructive changes and adding new elements and ensuring their interaction. By working together, it became possible to create the corresponding "Device..." namely, a cylindrical body limited by plugs in the centres of which a hollow shaft is hinged or rigidly mounted, on which mixing elements are fixed, freely rotating in different directions, and equipped with spacers, the so-called direct and reverse action, creating conditionally active zones of activation and moistening, in a certain area in the humidification zone, the hollow shaft has through holes and is ball-and-socket or rigidly connected to the mixture supply pipe, and the nozzle in the form of a conical cross-section is mounted perpendicular to the axis of the hollow shaft and is provided with a set of certain gate valves [10,11].…”

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confidence: 99%

Modern Method of Applying the Mixture on a Vertical Surface

Galushko,

Meneilyuk,

Bichev

et al. 2023

Modern Construction and Architecture

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When applying mixtures to a vertical surface, it is not always possible to use stationary equipment. This includes scaffolding, cradles, aerial work platforms, and, for small volumes, installation climbers. The mixture is usually applied with a roller, brush or spray gun. These methods lead to excessive consumption of the mixture, increased work time, and often a lack of safety precautions. Working at height is very dangerous, especially in the current environment. Therefore, both in our country and abroad, scientists are developing new alternatives to manual, semi-manual and mechanised methods. One of these mechanisms is automation and robotics. The task of the workers is to control the work processes, monitor the supply of materials and replace equipment as necessary. Such mechanisms are operated by up to three workers. Having studied all the available information, the authors proposed to use the Portal equipment to perform a range of works at height. It will allow you to perform work on slopes, terraces, and hard-to-reach places. To do this, you need to make a small terrace, level the surface, mount the rails, and install the Portal. Then, using additional mechanisms, the equipment is attached. In the first stage, augers are used to drill a well into which the reinforcement is installed, and the concreting process is carried out using various removable devices (winches, drills, etc.) that are attached to the Portal. In the second stage, the ground is excavated, and the pile is exposed by 3.6 metres. In the third stage, a wooden formwork is placed between the piles. The frame is partially attached to the pile, and the outer side of the formwork is mounted. The concreting process is carried out sequentially. First, the lower part is concreted, and then the upper part. In the fourth stage, the mixture is applied to the surface. The article presents and analyses the results of laboratory studies of the operation of the Portal equipment with a device for intensifying the injection of a flowing mixture. The following schemes were considered when choosing the technology of mixture injection: perpendicular-straight-line, perpendicular-circular and inclined-straight-line. The optimal combinations of layer thickness and the angle of inclination of the nozzle axis to the surface and technological schemes of application are given.

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“…Their use makes it possible to solve issues related to improving the homogeneity of the concrete mixture and increasing the strength of concrete in the vintage age. In this sense, intensive separate technology (IST) for the preparation of concrete mixtures is promising [8][9][10][11][12]. Its use involves the separation of the concrete mixture production process, namely: a) an activated highly concentrated cement-water composition is prepared in a high-speed mixer; b) in a traditional (ordinary) concrete mixer, the dosed for the batch fine and coarse filler is mixed with the cementwater composition to a homogeneous state.…”

mentioning

confidence: 99%

Intensive Separate Technology and Its Influence on the Properties of Cement-Water Compositions, Solutions and Concretes on Their Basis

Barabash¹,

Babiy²,

Streltsov³

2022

MCA

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The article reviews the issues related to the mechanical activation of Portland cement in the separate technology of the production of concrete mixtures in the production of concrete and reinforced concrete products. Usually, an essential characteristic of composite building materials based on Portland cement and its varieties used in building processes is their rapid setting of strength. Therefore, scientific researches related to the development of technologies aimed at the intensification of cement hydration processes and the growth of the speed of concrete strength gaining are relevant. The work presents the main technological processes during the production of concrete mixtures using intensive separate technology. The usage of this technology, particularly, makes it possible to significantly increase the reversibility of forms due to a more intense concrete strength gaining on mechanically activated Portland cement, especially during the early stages of hardening. The need to include mineral filler in the form of ground quartz sand during the preparation of the cement-water composition in a high-speed mixer is founded. It was experimentally discovered that the rapid mixing of the cement-water composition in the presence of a C-3 superplasticizer causes a sharp decrease in its effective viscosity, which positively affects the reduction of the water content of concrete mixtures of the required ease of workability. The mechanical activation of Portland cement causes an increase in the amount of chemically bound water in vintage-age cement stone from 13.1% to 17.9%, which means more than 36% compared to the control. It was established that with the same amount of binder, the strength of the concrete on activated Portland cement on the first twenty-four hours of hardening is 1.8...2 times higher compared to the concrete of similar composition, the binder of which was not activated. Over time, the effect of activation on the concrete strength decreases a little, but even at 28 days, the compressive strength of concrete on the activated binder is 25…30% higher compared to the control.

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Mechanoactivation of Portland cement in the technology of manufacturing the selfcompacting concrete

Cited by 4 publications

References 2 publications

Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Modern Method of Applying the Mixture on a Vertical Surface

Intensive Separate Technology and Its Influence on the Properties of Cement-Water Compositions, Solutions and Concretes on Their Basis

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Mechanoactivation of Portland cement in the technology of manufacturing the self­compacting concrete

Cited by 4 publications

References 2 publications

Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Fine-grained Fiber Concrete on Mechanoactivated Portlandcement

Modern Method of Applying the Mixture on a Vertical Surface

Intensive Separate Technology and Its Influence on the Properties of Cement-Water Compositions, Solutions and Concretes on Their Basis

Contact Info

Product

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Mechanoactivation of Portland cement in the technology of manufacturing the selfcompacting concrete