Available online at www.CivileJournal.org Civil Engineering Journal (E-ISSN: 2476-3055; ISSN: 2676-6957) Vol. 9, No. 05, May, 2023 1244 Study of the Effect of Magnetic Field on Dispersion of Crushed Portland Cement and Tensile Strength of Cement Stone Ruslan Ibragimov 1* , Evgenij Korolev 2 , Evgeny Khorkov 1 , Linur Gimranov 1 1 Kazan State University of Architecture and Engineering, Zelenaya Street 1, 420043 Kazan, Russian Federation. 2 Saint Petersburg State University of Architecture and Civil Engineering, St. Petersburg, Russian Federation. Received 25 January 2023; Revised 19 April 2023; Accepted 24 April 2023; Published 01 May 2023 Abstract This paper investigates the effect of a magnetic field on the grinding processes of Portland cement and the axial tensile strength of cement stone. It was found that the dispersion composition of Portland cement is affected by the magnetic field in two modes. Moreover, the grinding of Portland cement without a magnetic field has subtle modes within small particles (0.1–0.4 microns). The grinding of Portland cement with a magnetic field demonstrates an increase in the mode area of small particles and a decrease in the area of large particles (more than 1.6 microns), with an increase in processing time. In this work, the previously established magnetoplastic effect was confirmed in cement stone only in crystalline samples. The determined effect on cement stone is to reduce its strength by 53-59% and simultaneously increase relative deformation by 63–149%, depending on the specimen size and type. The magnetoplastic effect is also visually recorded on scans of the crack edges in cement stone examined using probe microscopy. The obtained experimental data confirm the validity of the proposed hypothesis of the effect of the magnetic field on polycrystalline materials with isotropic structure, in particular portland cement and cement stone, which consists in the fact that the magnetic field contributes to the accumulation of dislocations in the material, an acceleration of their movement, and the development of cracks. Keywords: Electromagnetic Mill; Magnetic Field; Deformation; Energy Consumption; Magnetoplastic Effect; Cement Stone. 1. Introduction Currently, around 2.4 billion tons of CO2 are released into the atmosphere when Portland cement is produced around the world. Herewith, the production of Portland cement is extremely energy-intensive: the consumption of fuel equivalent for firing 1 ton of clinker amounts to 215 kg; electricity for grinding the same is 119 kWh [1]. Hence, it is natural that we search for technological solutions to reduce the amount of portland cement used in cement or to reduce the energy consumption during grinding. One of the most effective methods of grinding Portland cement is the use of an electromagnetic mill, which has proven its advantage in creating clinkerless binders [2], regulating the kinetics of grinding copper ore [3], and with dry and wet grinding [4]. To improve the efficiency of the electromagnetic mill, studies have been conducted aimed at tracking the movement of the working medium in the mill [5, 6]. To improve the design of the electromagnetic mill so as to reduce energy consumption, various mills design solutions were proposed, mainly to ensure a uniform magnetic field inside the unit's mixing chamber to reduce electric losses [7–11]. However, it should be noted that the effect of the magnetic field on the properties of the material being ground during the operation of the electromagnetic mill has not been studied in the scientific literature. * Corresponding author: ibragimov@kgasu.ru http://dx.doi.org/10.28991/CEJ-2023-09-05-015 © 2023 by the authors. Licensee C.E.J, Tehran, Iran. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).