3.1.3. Particle Size Analysis

The particle size distribution of fly ash and bamboo ash was characterized by their D50 values as shown in Figure 3. The particle of bamboo ash is in micro size where the biggest size is determined at 163 μm with a median size of 14.5 μm. Also, the biggest size of particles in fly ash is revealed to be 66.9 μm with a median size of 15 μm. It is revealed that 83% of the bamboo ash particles are smaller than 45 μm, while almost 96% of fly ash particles have a size less than 45 μm. The specific area is found to be 510.4 and 658.4 m2/kg for bamboo ash and fly ash particles, respectively.

**Figure 3.** Particle size analysis of fly ash and bamboo ash.
