A cement producing company received complaints from their customers. The quality of their sand grains was inferior compared to the previously received batch. The company suspected that the change in quality might be due to the shape of the grains. A traditional sphericity analysis of both batches was made and showed no difference.
ParticleTech helped the company to analyse the two samples. It was very fast discovered that the grains of the poor-quality sample (sample 1) was round and smooth whereas the previously received sample (sample 2) was crushed and edgy.
Furthermore, ParticleTech compared a sphericity analysis with a roughness analysis of both samples. As presented in the graph the sphericity analysis showed the same result for both samples. However, the roughness analysis showed a clear distinction between the two samples. Sample 1 (red) had a smaller roughness parameter than sample 2 (blue). A smaller roughness parameter indicates smoother edges.
The roughness parameter indicates the difference between the real edge of a particle and the smoothed edge of the particle. The larger the roughness parameter, the more rough is the particle.