Recycled Materials
Recycled Materials Aggregate Base Course
Recycled base is crushed-up old concrete — sidewalks, curbs, broken slabs, foundations — run through a crusher and screened down to a mix of chunks and fines. It's dense-graded, so it has everything from about 1 inch down to dust. That mix packs tight when you roll it, and the angular pieces lock together under weight. Rebar and wire get pulled out with magnets before it leaves the yard.
You'll see it sold as recycled base, RCA base, crushed concrete base, or #610 recycled concrete when it's screened to that DOT gradation. The number just tells you the size mix. It usually costs less than virgin crushed stone because the raw material is a waste stream. It compacts just as well under driveways, parking pads, shed footings, and pipe runs.
What people use it for
How to choose within recycled materials aggregate base course
Base under something else
Reclaimed concrete or asphalt millings work great as base under a driveway or slab. The layer above hides what's underneath.
When the top layer is visible
Recycled base compacts to grey or dusty tan, not the clean look of fresh crushed stone. Fine under a surface course, off if it's the finish.
Check the source
Reclaimed loads vary by demo site. A supplier who can tell you where the feedstock came from is a better bet than the cheapest yard in town.
All recycled materials aggregate base course grades
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Other recycled materials families
Recycled Aggregate
ReferenceRecycled rock is old concrete and asphalt that's been crushed down and screened to size.
Screenings
ReferenceScreenings are the fine leftovers from crushing rock.
Recycled Materials 57 Stone
ReferenceRecycled #57 stone is old concrete that's been crushed and screened down to pieces between about 1 inch and 1/4 inch.
Recycled Brick
ReferenceRecycled brick is old clay brick crushed down into chunks and chips.
Recycled Materials Asphalt Aggregate
ReferenceRecycled asphalt is old road pavement that's been ground back down into gravel-sized pieces.
Recycled Concrete Aggregate
ReferenceRecycled concrete is old concrete that's been crushed and screened into usable sizes.
Recycled Materials 1 Stone
Reference#1 recycled stone is crushed old concrete screened to a large size, roughly 1½ to 3½ inches across.
Recycled Materials 4 Stone
Reference#4 recycled concrete is old concrete that's been crushed and screened to pieces between about 3/4 inch and 1½ inches.
Recycled Materials 610 Stone
ReferenceRecycled 610 stone is old concrete that's been crushed and screened down to a spread of sizes from about 1 inch to fines.
Recycled Materials 8 Stone
Reference#8 recycled stone is crushed recycled concrete screened between about 3/8 inch and 1/8 inch.
Recycled Materials Concrete Aggregate
ReferenceRecycled concrete is old concrete that's been crushed and screened back into usable rock.
Recycled Sand
ReferenceRecycled sand is the fine stuff left over when crushed concrete, brick, or old asphalt gets processed.