Back to Geotechnical Engineering repository
Geotechnical Engineering2D

Soil Classification - Theory & Concepts - Plasticity Chart

Systems for categorizing soils based on particle size and plasticity, including USCS and AASHTO.

Open the complete lesson

USCS Plasticity Chart

Result
CL
Lean Clay
Liquid Limit (LL)Plasticity Index (PI)A-LineCLMLCHMH

The A-Line separates clays (above) from silts (below). The vertical line at LL=50 separates low plasticity (L) from high plasticity (H).

Related simulations

Soil Classification - Theory & Concepts - Sieve AnalysisFlow Nets and Seepage Analysis - Theory & ConceptsEffective Stress - Theory & ConceptsCompressibility and Consolidation - Theory & Concepts