Construction Aggregate Sizes Explained: Crushed Stone vs Gravel

Related equipment: VU Aggregate Optimization System — review the system for manufactured-sand and aggregate grading applications.

Choosing aggregate starts with the concrete mix or process requirement, not a generic size name. Crushed stone has angular, freshly fractured faces; natural gravel is generally more rounded. That difference can affect interlock, workability and the crushing or screening stages needed to make a consistent product.

Crushed stone and gravel are not interchangeable labels

Crushed stone is produced by mechanically breaking rock such as granite, basalt or sandstone. Its angular particles can provide strong mechanical interlock, but shape, fines and durability still depend on the rock, crusher settings and screening circuit. Gravel is naturally rounded by transport and weathering; its smooth shape can improve flow but may provide less particle-to-particle interlock in some applications.

Read the size range as a specification

Terms such as fine, medium and coarse are not universal grading classes. A supplier may describe nominal ranges such as 5–10 mm, 10–20 mm or 20–40 mm, but the delivered product should be checked against a sieve analysis and the project specification. Ask whether the stated range is nominal, what percentage falls outside it, and how much dust or flaky material is present.

Match the largest particle to the application

For concrete, the permitted maximum aggregate size depends on the member geometry, reinforcement spacing, pumping arrangement and approved mix design. Do not choose a maximum size from a general article alone. For manufactured sand or graded aggregate, define the target grading curve and allowable variation, then verify that the crushing and screening line can hold it at the required throughput.

A practical receiving checklist

• Confirm rock type, source and intended use.
• Request a current sieve analysis, fines content and relevant durability results.
• Check particle shape, contamination, moisture and visible weathering.
• Agree on the nominal size, tolerances, sampling method and acceptance criteria.
• For a plant, record feed size, target fractions, capacity and recirculating load before selecting crushers or screens.

Prices vary by location, quarry, haul distance and date, so use a current local quotation instead of an old price range. The supplier’s test data and the project engineer’s specification are the basis for acceptance.

Questions to send with an enquiry

Share the application, required grading, expected tonnes per hour, feed material and site constraints. For an aggregate line, include a flowsheet and the target product fractions so equipment capacity can be checked against the full process.