## 1 Introduction
In this case, the cement-water suspension should contain a small part of cement (the ratio of solid particles/liquid in the suspension <0.4) [17; 18]. The chemical activation of aqueous systems includes alkalization with alkali metal hydroxides, readily soluble in water, for example, sodium hydroxide NaOH, as well as the introduction of small doses of cement. An element of electrophysical activation is ultrasonic and electromagnetic treatment, which initiate chemical activation [18]. In [20], methods of increasing the activity of water as the main component of the concrete mixture are considered. The data on the lesser degree of dependence of the results of electroactivation of cement suspensions in comparison with the electroactivation of mixing water on the seasonality of the work [20] are given. Increasing the efficiency of dry building mixes (binders) and concrete mixes can be achieved through the use of various activation methods. In addition to the use of various chemical modifiers in the binder, an important point is the grinding of dry building mixtures, magnetic activation of the barrier water, the treatment of cement mortar with electric discharges, etc. [16]. The authors of [22] carried out a comparative study of the effectiveness of various electrically conductive additives (steel fiber, coke powder, carbon nanofiber, graphite powder, steel dust) to reduce the electrical resistivity of cement and protect against electromagnetic interference [22]. The results of an experiment aimed at testing the possibility of using cement bypass dust (CBPD) in the preparation of materials activated with alkalis are summarized in [23]. In the experiment, a mixture of granulated blast furnace slag, fly ash, and cement bypass dust was activated with an alkali-sodium metasilicate. In [24], an activator, metakaolin, and microsilica were used as a complex activator to increase the activity of steel slag powder. It was determined by orthogonal analysis that the activator is the main factor influencing the strength of the solution. The results show that the method proposed in this study can reduce the cost of binders [24]. An experiment was carried out on the effect of mixing time for alkali-activated cement (AAC) using a binder mixed with ground granular blast-furnace slag and fly ash (FA) in a 1:1 ratio on the mechanical properties of cement in [25]. High-temperature curing, high dispersion of the binder, or even changing the parameters of the mixing method without using excessive activators can lead to an improvement in mechanical properties. Water activated by electric and magnetic fields was obtained in [26]. Compressive strength increased by 26%, and flexural tensile strength increased by 31%. In addition, due to the inclusion of water with magnetic activation into the cement slurry, the mechanical strength was retained without loss of workability with a decrease in the amount of cement [26]. The use of industrial (slag and fly ash) and ceramic waste for complete or partial replacement of Portland cement in the production of both alkali-activated and hybrid cements was proposed in [27]. The slag, activated by liquid glass, showed the highest mechanical strength and lowest porosity, but hybrid materials also showed competitive results [27]. The activation of binders in the apparatus of the vortex layer was investigated in [28]. It was found that the greatest impact force and impulse of force occurs in the investigated apparatus. In this case, the amount of energy supplied during the grinding time required to achieve the same dispersion of the binder in the vortex layer apparatus was 2-4.8 times higher than in traditional apparatus [28]. The optimal time of mechanochemical activation of a cement suspension was determined in [29], at which the maximum increase in the compressive strength of fine-grained concrete was achieved.