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Concrete Aggregate

Concrete Aggregate 8 Stone

#8 stone is small crushed rock, roughly 3/8 inch down to the size of coarse sand. The pieces are angular, so they lock together and stay put instead of rolling around. When it's headed into a concrete mix, the plant washes it first so the dust doesn't throw off your batch water.

The 8 comes from ASTM D448, a screen-size chart the concrete world uses. It tells you how big the pieces are and says nothing about what kind of rock they came from. You'll see #8 made from limestone, granite, or river gravel depending on what's local. Washed #8 for a concrete mix usually costs a bit more than the same stone sold as drainage rock, because the plant runs it through an extra wash.

1
named grade in this family

What people use it for

Fine stone in a concrete mixPipe beddingUnderslab drainageBackfill around utility linesAsphalt surface layerGrout for open-graded base

How to choose within concrete aggregate 8 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 8 stone grades

#8 Stone (#8 To 3/8″, Concrete)

Concrete aggregateDrainage systemsRoad base
3/8" to No. 8

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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 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→

Browse all concrete aggregate families →