Public test guide

Particle-size distribution by sieve

Separates a soil or gravel sample into size ranges to show how much coarse and fine material it contains.

Plain-language explanation

What the test tells you.

The project specification controls the exact method and acceptance requirement.

A prepared dry or washed sample is passed through a series of standard sieves with progressively smaller openings.

Representative sample, drying oven, balance, sieve stack and mechanical sieve shaker.

The percentage retained and passing each sieve, producing a grading curve for the material.

Used to classify soil and gravel, assess suitability for road layers, filters or fills, and check compliance with grading limits.

Typical test sequence

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Send the project, sample quantity, location and required completion date.