Particle Size Distribution — Sieve Analysis Tool
Geotechnical Lab — ASTM D422 / D6913 / IS 1498

Particle Size Distribution

Full USCS classification (ASTM D2487): sieve analysis + Atterberg limits → group symbol & name. PSD curve, D-values, Cu, Cc.

Sieve Stack (ASTM D6913)

weight retained, grams
Total sample mass — g

Atterberg Limits (for fine-grained / dual symbol)

Required for fine-grained soils (≥50% passing 0.075 mm) and dual-symbol coarse soils (5–12% fines). Determines ML/CL/MH/CH etc. and plots point on plasticity chart.
Calculation: % retained = (weight / total mass) × 100. Cumulative % = sum above sieve. % passing = 100 − cumulative %. D-values via log-linear interpolation (ASTM D422 §17).

Gradation Curve + USCS Classification

% passing vs. size (log scale)
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Enter sieve data to classify
Full USCS group symbol and name will appear here per ASTM D2487.

Composition by size

Casagrande Plasticity Chart (ASTM D2487)

USCS per ASTM D2487: Coarse if <50% passes 0.075 mm. Gravel if ≤50% of coarse fraction passes 4.75 mm. Well-graded gravel: Cu≥4 & 1≤Cc≤3. Well-graded sand: Cu≥6 & 1≤Cc≤3. Dual symbol if fines 5–12%. Fine-grained classified by plasticity chart A-line: IP = 0.73(wL − 20).
Standards: ASTM D6913 (sieve analysis), ASTM D422 (particle size), ASTM D2487 (USCS classification), ASTM D4318 (Atterberg limits). Boundaries: Gravel >4.75 mm, Sand 0.075–4.75 mm, Fines <0.075 mm. Coarse: <50% passing 0.075 mm. Fine: ≥50% passing 0.075 mm. Gravel vs Sand split: coarse fraction retained/passing 4.75 mm. Organic soils (Pt, OL, OH) require visual identification and odor test — not determinable from sieve analysis alone.