Concrete Aggregate

Concrete Aggregate Crushed Stone

Concrete aggregate crushed stone is the coarse rock that goes into a concrete mix. Quarry rock gets crushed, screened to a set size range, and washed to keep out dust. When cement paste hardens around it, the angular faces lock together and carry the load. Most of a slab's strength actually comes from this stone, not the cement.

The size that goes into a mix depends on what you're pouring. For most driveways and slabs, #57 stone (about 1 inch down to 1/4 inch) is the standard pick, with #67 or #8 used for thinner pours. ASTM C33 is the spec that sets the grading and cleanliness rules concrete plants follow, so a load sold for concrete has to hit tighter numbers than plain base rock. Expect to pay a little more per ton than driveway gravel because it's been washed and sized more carefully.

named grade in this family

What people use it for

Ready-mix concrete for driveways and slabsFoundations, footings, and stem wallsSidewalks, curbs, and patio poursPrecast concrete productsStructural concrete for retaining walls

How to choose within concrete aggregate crushed stone

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 crushed stone grades

Crushed Stone (1.5″ To 3″, Crushed, Concrete)

Road baseDrainage fillErosion control

1.5" To 3"

Other concrete aggregate families

Concrete Sand

Reference

Concrete sand is a coarse, washed sand screened to a specific size range so it works in a concrete mix.

16 grades→

Concrete Aggregate Sand

Reference

Concrete sand is a coarse washed sand with grains up to about 3/8 inch across.

4 grades→

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.

3 grades→

Concrete Aggregate Rip Rap

Reference

Rip rap is large, loose stone dumped along shorelines, creek banks, ditches, and bridge abutments to stop moving water from washing the g…

3 grades→

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.

2 grades→

Concrete Aggregate Gravel

Reference

Concrete aggregate gravel is washed, rounded rock sized to mix into concrete.

2 grades→

Recycled Concrete

Reference

Recycled concrete is old concrete that's been broken up and crushed back down to gravel size.

2 grades→

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.

1 grade→

Concrete Aggregate 3 Stone

Reference

#3 stone is crushed rock sized between about 1 1/2 inches and 2 inches.

1 grade→

Concrete Aggregate 4 Stone

Reference

#4 stone is crushed rock that runs about 1½ inch down to ¾ inch.

1 grade→

Concrete Aggregate 8 Stone

Reference

#8 stone is small crushed rock, roughly 3/8 inch down to the size of coarse sand.

1 grade→

Concrete Aggregate 89 Stone

Reference

#89 stone is small crushed rock, sized between about 3/8 inch and the coarse-sand range.

1 grade→

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