Site investigation · Laboratory: rock & aggregates
Ten percent fines value (wet/dry strength) calculator
Load giving 10% fines from a test at x kN producing y% fines: F = 14x/(y + 4); wet/dry variation.
Standard: AS 1141.22 · BS 812-111
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Inputs in the worked example
The live calculator starts with these values; change any of them and every result, check and diagram updates instantly.
| Input | Value | Unit |
|---|---|---|
| Dry test load | 200 | kN |
| Dry fines produced | 8.6 | % |
| Wet test load | 150 | kN |
| Wet fines produced | 9.4 | % |
| Min wet strength | 100 | kN |
| Max wet/dry variation | 35 | % |
Worked example — results
| Result | Value | Unit |
|---|---|---|
| Dry strength | 222.2 | kN |
| Wet strength | 156.7 | kN |
| Wet/dry variation | 29.48 | % |
- ✓ Wet strength ≥ min
- ✓ Variation ≤ max
- ✓ Fines produced within 7.5–12.5%
Method, formulas and assumptions
- Dry strength = 14*200/(8.6+4) = 222.22 kN
- Wet strength = 14*150/(9.4+4) = 156.72 kN
- Wet/dry variation = 100*(222.22-156.72)/222.22 = 29.478 %
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For preliminary design and education. Check every result against the current standard and your own engineering judgement before use.