Soil Grain Size Distribution Curve

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The size distribution curves, as obtained from coarse and fine grained portions, can be combined to form one complete grain-size distribution curve (also known as grading curve). A typical grading curve is shown.

Soil Grain Size Distribution Curve

Soil Grain Size Distribution Curve

From the complete grain-size distribution curve, useful information can be obtained such as:

1. Grading characteristics, which indicate the uniformity and range in grain-size distribution.

2. Percentages (or fractions) of gravel, sand, silt and clay-size.