Particle Size Distribution
Sieve Analysis / Granulometry Test
Test Definition and Importance
Particle Size Distribution: The process of determining the percentage ratios of particles in different sizes in a bentonite sample. D10, D30, D50, D60 values are calculated from the granulometry curve, along with uniformity coefficient (Cu) and curvature coefficient (Cc) [^13^][^16^].
Well-graded sand: Cu ≥ 6 and 1 ≤ Cc ≤ 3 [^20^]
Sieve Analysis Calculation Robot
Enter retained weights on sieves in grams (empty sieves will be considered as 0):
Test Procedure
Sample Preparation
Representative bentonite sample is taken (100-500g). Dried in oven at 105±5°C and brought to homogeneous condition [^14^].
Sieve Stack Preparation
Sieves are arranged from largest to smallest: 2mm, 1mm, 500µm, 250µm, 150µm, 75µm (No.200) and pan [^13^].
Sieving Operation
Sample is placed on top sieve, shaken in mechanical sieve shaker for 10-15 minutes. For hand sieving, circular motion is applied [^14^].
Weighing and Calculation
Material retained on each sieve is weighed (±0.01g). Percent retained, cumulative retained and cumulative passing values are calculated [^13^][^14^].
Industry Acceptance Criteria
Required Equipment
- ☑ Standard sieve set (2mm - 75µm)
- ☑ Mechanical sieve shaker
- ☑ Precision balance (0.01g accuracy)
- ☑ Drying oven (105°C ± 5°C)
- ☑ Brush and cleaning tools
- ☑ Sample splitter (quartering)
- Total mass should be between 98-102% of initial sample [^14^].
- Sieves must be clean and undamaged, mesh openings must not be clogged.
- Shaking duration must not be shorter than specified in standard.
- Do not force particles through No.200 (75µm) sieve.