## 3 Results and Discussion
The obtained dependences show that an increase in the number of blades of the activator and the speed of its rotation led to an increase in the power spent on mixing. Thus, an increase in the number of blades from three to six led to an increase in power by about 30%. The final decision of the number of activator blades should be made taking into account the data in Figure 11 and the economic efficiency of the adopted design decisions. Effect of the Ratio of Mixer Diameter to Activator Diameter on the Homogeneity of Foam Concrete Mixture and Power Consumption (Stage 5)  
Changing the ratio of mixer diameter to activator diameter in the range \(D/d_{a}=1\)-7 influences the power spent on mixing insignificantly if there are no reflective partitions in the mixer design. If there are reflective partitions in the mixer, this effect is enhanced. According to the results of previous studies, the optimal value of the parameter \(Jb/D=0.25\) was selected. In this case, we carried out experimental studies of the influence of the parameter \(D/d_{a}\) on the power consumed by the mixer. The number of reflective partitions in the mixer was \(J=4\), with a width of  
By analyzing the results, it can be seen that an increase in the parameter \(D\)/\(d_{a}\) (a decrease in the diameter of the activator) reduced the power consumption. To assess the degree of influence of \(D\)/\(d_{a}\) on the homogeneity of the foam concrete mixture, we carried out an experiment on a laboratory mixer of cylindrical shape (\(D\) = 150 mm) with a conical part (\(\alpha_{come}\) = 60\({}^{\circ}\)). Reflective partitions with a width of \(b\) = 0.06\(D\) were installed in the mixer. The experimental results are shown in Figure 13.  
Figure 13 shows that an increase in the ratio \(D\)/\(d_{a}\) led to a decrease in the homogeneity of the foam concrete mixture. The results of experiments assessing the degree of influence of the parameter \(D\)/\(d_{a}\) showed that the choice of the ratio of the mixer diameter to the activator diameter should be carried out taking into account the power consumption \(k_{N5}\) and the homogeneity of the prepared mixture \(K_{clm}\). The research results demonstrate that the optimal value of the ratio \(D\)/\(d_{a}\) ranged from 4-6. Figure 12: Influence of the ratio \(D\)/\(d_{a}\) on the power factor \(k_{N5}\): 1—mixer design without partition plates; 2—mixer design with reflective partitions (\(J\) = 4) (experimental data). Figure 5:0 Mixture homogeneity coefficient \(K_{clm}\) vs. parameter \(D\)/\(d_{a}\) (experimental data). Effect of the Blade Sizes on the Mixing Quality of Mixture and the Power Consumption of Mixer Drive (Stage 6)  
The study of the influence of the geometric parameters of mixer on the mixture quality and the power consumption revealed the need to take into account the geometric parameters of the activator. Such parameters are the sizes of blades (length \(a_{bl}\) and width \(b_{bl}\)), measured from a projection onto a plane passing through the axis of the mixer shaft and the middle of a blade (Figure 14). At the next stage of the experiment, a cylindrical mixer with a conical part and a three-blade activator with removable blades were used. The blades were chosen with \(a_{bl}/b_{bl}\) ratio ranging from 0.2 to 0.6. The constant speed of rotation of the activator was taken equal to 500 rpm. A foam concrete mixture of the following composition per 1 m\({}^{3}\) was used as a stirred medium: cement--400 kg; sand--200 kg. ; water--480 L; foaming agent--1 L [27; 28; 29]. The dependence of the homogeneity coefficient of the mixture \(K_{clm}\) on the parameter \(a_{bl}/b_{bl}\) is shown in Figure 15, and a graph of power factor \(k_{N6}\) versus parameter \(a_{bl}/b_{bl}\) is shown in Figure 5:1  
Figure 5:2 Geometric parameters of blades. Figure 5:3 Homogeneity coefficient of mixture \(K_{clm}\) vs. parameter \(a_{bl}/b_{bl}\) (experimental data). The dependence shows that the maximum value of \(K_{chm}\) was achieved at \(a_{bl}/b_{bl}\) from 0.35 to 0.45.