ISKRIT / Site investigation & geotechnics / Grain-size distribution
Site investigation & geotechnics
Particle size distribution: d10, d60, coefficient of uniformity
From sieve and hydrometer analysis the tool plots the particle size distribution curve, finds the controlling diameters, and classifies sands and coarse-grained soils.
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Free, no sign-up · interface in Russian
Standards
GOST 25100-2011 and GOST 12536: grain size classification, Cu = d60/d10.
Input
Fraction masses per sieve, or percentages retained.
Output
Curve, d10/d30/d60, Cu, Cc, soil name.
What it does
- Particle size distribution curve
- Controlling diameters d10, d30, d60
- Coefficient of uniformity Cu and curvature Cc
- Grain size classification
Free and full version
Free
0 ₽
- Code-based calculations with no run limits
- Input validation and printable results
- Works instantly, no sign-up required
Full version
On request
- Save samples and projects
- Export curves and tables to XLSX
- Import results from Excel
- History per project
Questions
Which analyses are supported?
Sieve analysis for sands and coarse soils, hydrometer analysis for fine fractions.
How is uniformity assessed?
Cu = d60/d10; soil with Cu below 3 is classed as uniform.
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