Concrete Aggregate
Concrete Aggregate Gravel
Concrete aggregate gravel is washed, rounded rock sized to mix into concrete. The stones come from riverbeds or gravel pits, so they're smooth and egg-shaped instead of sharp. Washing rinses out silt and fines so the rock bonds clean with cement paste. You'll see it sold by grade numbers like #57 or #89, following the ASTM C33 spec that concrete plants use.
The name tells you the rock is graded for use in concrete. Any hard, clean stone that meets the spec qualifies, and most of what you'll see around here is washed river gravel. The grade number (57, 67, 89) is a screen size from ASTM D448 that says how big the pieces run. A #57 is roughly 1 inch down to 1/4 inch. A #89 is 3/8 inch down to fines. It usually runs a few dollars more per ton than the same rock sold unwashed, because of the extra step at the plant.
Compare every grade
| Grade | Size | Shape | Washed | Top use | We deliver |
|---|---|---|---|---|---|
| Gravel (1.5″, Concrete) | 1.5" | — | — | Concrete aggregate | Reference only |
| Gravel (Concrete, Gray) | — | — | — | Concrete mixing | Reference only |
What people use it for
How to choose within concrete aggregate gravel
Match the mix design
Batch plants and ready-mix trucks work to a spec. Confirm the size and gradation the plant is running before you order.
Coarse vs. fine
Coarse aggregate gives the mix its strength; fine aggregate fills the gaps. A slab needs both — usually delivered separately and blended at the plant.
Cleanliness matters
Fines and clay contamination weaken the cure. If a load looks dusty, ask for a wash spec sheet before you take delivery.
All concrete aggregate gravel grades
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Other concrete aggregate families
Concrete Sand
ReferenceConcrete sand is a coarse, washed sand screened to a specific size range so it works in a concrete mix.
Concrete Aggregate Sand
ReferenceConcrete sand is a coarse washed sand with grains up to about 3/8 inch across.
Concrete Aggregate 57 Stone
Reference#57 stone is crushed rock screened to fall between about 1 inch and 1/4 inch, with the fines washed out.
Concrete Aggregate Rip Rap
ReferenceRip rap is large, loose stone dumped along shorelines, creek banks, ditches, and bridge abutments to stop moving water from washing the g…
Concrete Aggregate 67 Stone
Reference#67 stone is crushed rock screened between about 3/4 inch and 1/4 inch, with the fines washed out.
Recycled Concrete
ReferenceRecycled concrete is old concrete that's been broken up and crushed back down to gravel size.
Concrete Aggregate 1 Stone
Reference#1 stone is one of the biggest sizes of clean crushed rock you can buy, with pieces roughly 1 1/2 to 4 inches across.
Concrete Aggregate 3 Stone
Reference#3 stone is crushed rock sized between about 1 1/2 inches and 2 inches.
Concrete Aggregate 4 Stone
Reference#4 stone is crushed rock that runs about 1½ inch down to ¾ inch.
Concrete Aggregate 8 Stone
Reference#8 stone is small crushed rock, roughly 3/8 inch down to the size of coarse sand.
Concrete Aggregate 89 Stone
Reference#89 stone is small crushed rock, sized between about 3/8 inch and the coarse-sand range.
Concrete Aggregate Crushed Stone
ReferenceConcrete aggregate crushed stone is the coarse rock that goes into a concrete mix.