Study of the influence of properties of dusty ferromagnetic additives on the increase of cement activity

Sakhno, Serhiy; Yanova, L.; Pischikova, Olena; Chukharev, Serhii

doi:10.1051/e3sconf/202016606002

Cited by 11 publications

(9 citation statements)

References 2 publications

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“…In [12], the influence of the additive's magnetic and dispersed properties on the activation effect was studied. Obtained in [12], dependences of cement strength on magnetization and particle dispersity and the additive small proportion (up to 2%) led to the conclusion that the activation effect is not due to the filler or pozzolanic effect but due to the effect of magnetic fields. Still, the impact of long-term magnetic fields on the processes of cement hydration was not considered yet.…”

Section: Analysis Of Research and Publicationsmentioning

confidence: 99%

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

et al. 2021

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One of the essential tasks for a sustainable future is to reduce harmful emissions into the atmosphere significantly. Cement production is the world’s largest industrial carbon pollutant, accounting for 8 % of global emissions. More than 2.2 gigatons of carbon dioxide are emitted into the atmosphere every year. Therefore, reducing the energy intensity of products and reducing the number of harmful emissions in cement production is becoming critical. One strategy to reduce cement production emissions is to reduce the most energy-consuming component in cement – clinker. In this case, various activation methods are used for maintaining the same level of cement activity. One of these methods is the impact on the hardening binder with magnetic fields. The paper presented a study of hydration processes of blast-furnace cement activated by a magnetized ferromagnetic additive. The work established that the introduction of pre-magnetized ferromagnetic dust into blast-furnace cement composition has an activating effect on binder hydration. It shows that activation occurs both in the initial and long periods of hardening. The nature of the mutual influence of the components of the hydration system alite-lime-slag in a modified binder was revealed. The investigation determined that the ferromagnetic additive, intensifying the process of slag hardening, increases the proportion of hydrated slag by 1.5-2 times. It was revealed that the formation of the ettringite framework in the modified binder’s gel is completed within one day. It is shown that in the subsequent periods, hydration of aluminates occurs mainly due to the formation of tricalcium aluminate hexahydrate (C3AH6), which excludes destructive processes in the late periods of binder hardening. It has been established that under the action of a ferromagnetic additive, the degree of crystallization of hydro silicates in the modified binder increases.

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Section: Analysis Of Research and Publicationsmentioning

confidence: 99%

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

et al. 2021

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“…The studies carried out were based on the well-known method of analysis of small samples [31], according to which selective without bias and kurtosis can be used for an approximate test of the hypothesis of the normal distribution. Sample values of without bias and kurtosis are compared with the standard deviations of asymmetry and kurtosis, and the results of the comparison are used to judge the agreement with the normal distribution law [32][33][34][35][36].…”

Section: Resultsmentioning

confidence: 99%

Modeling the distribution of rock mass and native copper output by size classes during crushing

et al. 2021

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The article considers the features of the distribution of technological indicators (product output, content and extraction of copper) by size classes, the main factors influencing the crushing process are identified and regression dependences of productivity on influencing factors are received. The parabolic nature of the dependences of the output of crushed rock on the size class is established. The high adequacy of the obtained models was confirmed and the most promising classes of rock size for copper extraction were determined. The obtained results and models will allow to develop a generalized model of the process of native copper mining and to implement this process with rational and optimal parameters. Also, the received models will allow to carry out an estimation of productivity of a research site of processing of raw materials of basalt quarries.

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“…Furthermore, the influence of magnetic fields on the hardening of binders is considered in works [21][22][23][24][25][26][27]. In research results [28,29], it has been proved that both the magnetization of particles and their dispersed composition affect the strength characteristics of BFC.…”

Section: Research and Publications Analysismentioning

confidence: 99%

Investigation of the influence of technological factors and compositions of binders on the strength characteristics of blast–furnace cement with magnetized ferromagnetic additives

Sakhno

Yanova

Pischikova

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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Cement production is a significant source of carbon dioxide emissions. One of the ways to reduce emissions is to reduce the proportion of clinker in cement by introducing active mineral additives into its composition, particularly granulated blast-furnace slag. One of the ways to increase the activity of such cement is the effect of magnetic fields on the spin multiplicity of the substances involved in the hardening reaction. In this case, the maximum effect is ensured by introducing a magnetized finely dispersed ferromagnetic substance into the cement composition. The activation effect depends on the additive’s adding method to the cement’s composition, the components ratio in the cement, and the cement hardening mode. This work aims to identify the influence of the adding method of the additive, the slag and additive proportion in cement, and the steam curing temperature on the activity effect of the binder. Three groups of studies were carried out to determine the strength characteristics of laboratory samples hardened both in natural conditions and during steaming. In the first group, cement samples have tested containing 40% slag obtained by joint grinding and joint mixing of the additive with cement for 0.5, 1, 2, 4 and 8 minutes. In the second group, samples have tested with the additive amount varied from 0 to 2.5%, and slag amount from 0 to 80%. Finally, cement samples were tested in the third group containing 50% slag and from 0 to 2.5% additive. The samples were steam cured at temperatures ranging from 50 to 90° C and tested one day, 28 and 90 days after steam curing. As a result of the research, it has revealed that to obtain the maximum effect, the additive must be introduced into the cement composition by joint grinding. The factors influencing the activity have been determined. At the same time, the time of joint grinding should ensure uniform mixing of the components and the formation of new surfaces of cement grains in the presence of magnetic fields. Too long joint grinding leads to the loss of the magnetic properties of the addition. It was found that the activation effect from the additive addition increases with an increase in the proportion of slag. In cement without slag, an increase in the additive content leads to a drop in strength. It was revealed that the introduction of magnetized ferromagnetic dust additives into the composition of the SPC makes it possible to reduce the steam curing temperature of products by 20-25° C. Studies have shown that using a finely dispersed ferromagnetic substance as an activating additive can save energy resources and reduce emissions.

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Study of the influence of properties of dusty ferromagnetic additives on the increase of cement activity

Cited by 11 publications

References 2 publications

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

Study of the influence of magnetized ferromagnetic additives on the processes of cement hydration

Modeling the distribution of rock mass and native copper output by size classes during crushing

Investigation of the influence of technological factors and compositions of binders on the strength characteristics of blast–furnace cement with magnetized ferromagnetic additives

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