Ultradisperse slag suspensions aggregative and sedimentative stability

Самченко, Светлана; Zemskova, Оlga; Kozlova, I. V.

doi:10.1051/matecconf/201710603017

Cited by 7 publications

(9 citation statements)

References 10 publications

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“…The involvement of waste provides a reduction in the cost of producing efficient and modern mortars and concretes [4,5,6]. But the disposal of ash [2,4,6] and slag waste [3,7,8] is also interesting from the point of view of solving environmental problems [1,7]. Since recycling provides the release of huge areas.…”

Section: Introductionmentioning

confidence: 99%

“…The level of useful use of coal ash and slag in it can be more than 1 million tons per year. Thus, the cement industry [8,9], the production of mortars and concretes [11], the production of lightweight aggregates (aggloporite and alumina expanded clay), the production of building ceramics and silicate bricks have great potential for their use. With the integrated use of TPP ash as a secondary raw material, the profitability of production increases.…”

Section: Introductionmentioning

confidence: 99%

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Application of Fuel Ash as a Microfiller in Cement Dispersion Systems

Petropavlovskaya

Novichenkova

Petropavlovskii

et al. 2021

MSF

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The paper shows studies of modified cement compositions with micro-filler. As such a micro-filler, an ash product is used - an activated waste of an ash-and-slag mixture. The enriched aluminosilicate waste is characterized by a fairly stable chemical and particle size distribution. The used activation of the ash product allows for a more dense packing of particles in the composition of the binder dispersed system. The high dispersion of the ash component requires additional plasticization of the dispersed system. Despite the fact that during the activation process the destruction of large-pore particles remaining after flotation occurs, the introduction of a plasticizer also improves the rheological characteristics of the compositions, and, consequently, increases the strength and density of the modified cement stone with the addition of a microfiller.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of Fuel Ash as a Microfiller in Cement Dispersion Systems

Petropavlovskaya

Novichenkova

Petropavlovskii

et al. 2021

MSF

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“…The authors of works [18][19] considered the preparation of cements and cement compositions with finely ground steel-smelting slags that, during combined hydration with cement, form hydration products in the form of submicrocrystalline hydrate phases that compact the structure of the cement stone and further bind the individual grains of the composition, which leads to the hardening of its structure.…”

Section: Introductionmentioning

confidence: 99%

Influence of optimal conditions of ultrasonic dispersion on the stability of suspensions of finely ground slags

et al. 2019

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The preparation in the jet mill of finely ground slag (FGS) from the waste of metallurgical production granulated blast-furnace slag, the obtaining of slag suspensions, and the behavior of FGS particles in an aqueous dispersion medium are considered in the paper. It was found that FGS particles in the suspension form micelles of two types with negative (micelle 1) and positive (micelle 2) charges of FGS surface. To increase the aggregative and sedimentation stability of FGS particles in suspensions, studies were carried out using ultrasonic dispersion. The results of investigations on the detection of optimal dispersion parameters for slag suspensions are presented. It was found that in the absence of temperature control, the process of coagulation of slag particles is accelerated and aggregative and sedimentation stability of suspensions of FGS is reduced. The slag particles in the suspension form aggregates that lead to a deterioration of the strength characteristics of the cement stone using suspensions of FGS. Optimal parameters of ultrasonic dispersion of slag suspensions are established: the frequency of ultrasonic vibrations is equal to 44 kHz; the dispersion temperature is 25 ± 2 °C; the dispersion time is 15 min. It was found that the application of ultrasonic dispersion to slag suspensions with the observance of dispersion conditions can increase the aggregative and sedimentation stability of FGS suspension by 2-3 times in comparison with the mechanical mixing of suspensions. The strength of samples with suspensions of FGS prepared using UST under the recommended dispersing conditions increased by 19 to 39% in the first day; for 28 days of hardening - by 19 - 36%, which allows using slag suspensions in the production of cement composite materials and concretes based on them.

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“…An increase in the strength of cements with the addition of finely ground slag (FGS) in the initial periods of hardening by an average of 50% was observed, but the standard deviation of the strength characteristics was 6-7%, indicating uneven distribution of the slag component in the cement system. To ensure uniform distribution of slag particles in the volume of the cement matrix, it is proposed to introduce FGS as a suspension into the cement instead of mixing water [16][17][18]. The papers [19][20][21][22][23][24][25] carried out studies on the establishment of aggregative and sedimentation stability of dispersions of various substances of the nanoscale series: carbon nanotubes, europium oxohydroxide hydrosol, γ-Al2O3 sol, etc.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of stabilization of slag suspensions by polycarboxylate

et al. 2019

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The paper describes the method of stabilization of slag suspensions prepared on the basis of finely ground slag (FGS) with a predominant particle size of 1-7 μm, a plasticizer based on polycarboxylate (polycarboxylate). In suspension, FGS particles form two types of micelles with negative and positive surface charges. It has been established that stabilization with polycarboxylate, which is an anionic long-chain surfactant, affects slag particles with a positive surface charge. The formation of strong and elastic gel-like films on the surface of FGS leads to an increase in the structural and mechanical factor of aggregative stability of slag suspensions. Thus, the stabilization of slag particles by polycarboxylate is ensured by electrostatic, structural and mechanical factors of aggregative stability. It was established experimentally that the introduction of polycarboxylate into the aqueous dispersion medium increases the aggregative and sedimentation stability of slag suspensions. In the first period of particle sedimentation, on average, stability of slag suspensions is increased by 36 times, in the second period - 19 times, in the third period - 4 times. To ensure stability of slag suspensions, the protective number and the optimal concentration of the polycarboxylate are determined. The protective number of the suspension was 0,016 g/l; the optimal concentration of polycarboxylate - 4 g/l.

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Ultradisperse slag suspensions aggregative and sedimentative stability

Cited by 7 publications

References 10 publications

Application of Fuel Ash as a Microfiller in Cement Dispersion Systems

Application of Fuel Ash as a Microfiller in Cement Dispersion Systems

Influence of optimal conditions of ultrasonic dispersion on the stability of suspensions of finely ground slags

Efficiency of stabilization of slag suspensions by polycarboxylate

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