Concrete Aggregate

Concrete Aggregate 1 Stone

#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. It's angular, since it's rock that's been run through a crusher and screened to keep the big chunks and drop out the fines. Because the pieces are so large, a pile of #1 holds a lot of open space between the rocks. That's what makes it drain fast and lock in place under heavy loads.

The 1 comes from ASTM D448, a size chart that numbers coarse rock from #1 (biggest) down to #10 (smallest). The number tells you the size and says nothing about what kind of rock it is, so #1 might be limestone, granite, or trap rock depending on the pit. It's a specialty size, not a driveway grade, so it usually costs more per ton than common stones like #57. You'll pay a bit extra for the extra screening and the bigger crusher pass.

named grade in this family

What people use it for

Erosion control on steep slopes and stream banksBackfill behind large retaining walls and bridge abutmentsFrench drains and culvert outlets that need to move a lot of waterConstruction entrances for heavy trucksBallast and subballast for rail linesMass concrete pours where a big coarse rock is called for

How to choose within concrete aggregate 1 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 1 stone grades

#1 Stone (3/4″ Minus, Washed, Concrete, Black)

Driveway baseDrainage systemsConcrete mix

3.5" to 1.5"

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 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→

Concrete Aggregate Crushed Stone

Reference

Concrete aggregate crushed stone is the coarse rock that goes into a concrete mix.

1 grade→

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