**3. Results and Discussion**

*3.1. Physical Properties*

The results of the particle size analysis, after grinding and milling, are presented in Figure 2 and Table 1.

**Figure 2.** Particle size distribution.

**Table 1.** Basic parameters for the particle size distribution.


The mean size of the particle is about 600 μm. In comparison to the other raw materials used in the geopolymerization process, such as metakaolin or fly ash, this particle size is quite large [2]. It should be noted that research shows that decreasing the particle size can positively influence the material reactivity [2], but at the same time increase the energy consumption for the whole process.
