Crushed Concrete Driveway: Pros, Depth and Tons

Crushed concrete, often sold as recycled concrete aggregate or RCA, is broken concrete that has been crushed and screened into a usable stone. Homeowners use it as a driveway surface, as a compacted base under asphalt or pavers, and as a cheaper stand-in for virgin quarry stone. A loose cubic yard usually weighs a little less than dense trap-rock blends. This guide covers what crushed concrete is, when it works as a driveway, how deep to lay it, how many tons to order, and where virgin stone or asphalt millings may fit better.

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What crushed concrete is

When sidewalks, curbs, foundations and pavement are torn out, the broken pieces can go to a crushing plant instead of a landfill. The plant removes most rebar and other metal, then runs the concrete through crushers and screens. The result is a graded aggregate that looks like gray crushed stone. Yards sell it under names such as crushed concrete, recycled concrete, RCA, recycled concrete aggregate or, in some regions, recycled QP.

Gradations vary. Common driveway and base products run from about 1 1/2 inches or 3/4 inch down to dust, so they pack like crusher run. Cleaner, washed sizes with little dust are better for drainage layers. Always ask the yard for the top size and whether fines are included, because a “driveway mix” and a “drainage stone” are not the same load.

Pros of a crushed concrete driveway

Cost. Recycled concrete is often priced below comparable virgin stone, especially near cities with a lot of demolition.
Compaction. Blends with fines lock together when wetted and compacted, so the surface can feel firmer than loose clean stone.
Reuse. Using demolished concrete keeps material out of landfills and cuts the need for new quarried rock.
Availability. Many aggregate yards and asphalt plants stock it year-round.

Cons and tradeoffs

Debris. Even well-screened piles can hold bits of rebar, wire, brick, asphalt or plastic. Look at the stockpile before you order a truckload.
Alkaline runoff. Fresh crushed concrete can leach high-pH water at first. Keep it away from ponds, streams and plantings you care about until it has weathered.
Color and dust. The gray look is industrial. Dry fines can track onto shoes and into the house more than washed stone.
Softening when wet. Like other dense bases with fines, a crushed concrete surface can get muddy or pump if it sits on clay with poor drainage.
Not a sealed pavement. It is still a gravel-style driveway. It will need regrading and occasional top-ups, and it will not shed water the way asphalt does.

For a side-by-side with millings, see crushed asphalt vs crushed concrete. For weight numbers by yard, see how much crushed concrete weighs.

Surface driveway vs base under asphalt

Crushed concrete shows up in two common driveway roles:

As the driving surface. A compacted layer of dense crushed concrete can serve as a gravel driveway on its own. Plan on periodic grading, crowning and adding stone where traffic wears it thin.
As the base under asphalt or pavers. Many contractors use recycled concrete as the compacted stone layer under hot-mix asphalt or under a sand setting bed for pavers. Our post on recycled concrete under asphalt covers that use.

If your town or a paving quote calls for a named state base (DGA, 2A, ABC, Item 4 and similar), ask whether the yard’s crushed concrete is certified to that spec. For a plain gravel driveway, the practical test is simpler: does the mix have enough fines to lock when compacted, and is the pile reasonably clean?

How deep to lay it

Top-up over an existing firm base: about 2 to 3 inches compacted.
New light-use driveway on firm soil: often about 4 to 6 inches compacted total.
Soft soil, clay or heavier trucks: 6 to 8 inches or more, built in lifts, sometimes over a geotextile fabric and a coarser stone bottom layer.
Base under asphalt: follow the paving contractor or town detail; many residential jobs land in a similar 4 to 8 inch compacted range.

These are planning ranges, not a substitute for a permit detail or a contractor who has seen your soil. Soft spots, springs and steeper grades usually need more stone or a different section.

How much a yard weighs

Crushed concrete is usually a little lighter per cubic yard than dense trap-rock QP or granite crusher run, and a little heavier than some open-graded clean stones. For planning, many people use roughly 1.2 to 1.5 tons per loose cubic yard, and ask the supplier for its own figure. Moisture, rock type and how much dust is in the mix all move the number. Use the yard’s ton-per-yard value when you convert an area calculation into an order.

How many tons to order

Measure length and width in feet and the finished depth in inches, then:

Cubic yards = length × width × depth in inches ÷ 324
Tons ≈ cubic yards × the supplier’s tons-per-yard figure (about 1.35 is a middle planning value if you do not have one yet)
Add 10 to 15 percent for compaction and uneven ground

Depth	Approx. area per ton (at 1.35 t/yd)	Tons per 100 sq ft
2 inches	about 120 sq ft	about 0.83
3 inches	about 80 sq ft	about 1.25
4 inches	about 60 sq ft	about 1.7
6 inches	about 40 sq ft	about 2.5

Add the compaction allowance on top of those figures. Example: a driveway 12 feet wide and 40 feet long at 4 inches is 12 × 40 × 4 ÷ 324 ≈ 5.9 cubic yards. At 1.35 tons per yard that is about 8 tons; with 15 percent extra, order about 9 to 10 tons. The base calculator handles other shapes, and our dump truck capacity guide helps turn tons into deliveries.

How to build it so it lasts

Strip sod and soft topsoil so the stone sits on firm subgrade.
Grade for drainage. Crown the driveway or slope it so water leaves the surface instead of puddling.
Place and compact in lifts of about 2 to 4 inches. See compacting a gravel base in lifts.
Dampen the stone so fines knit; bone-dry or soaking-wet material packs poorly.
Use a plate compactor or roller. Hand raking alone will not lock a dense mix.
Edge it with timber, stone or a trench so traffic does not shove the edges into the lawn.

When to choose something else

You want a black, sealed surface. Hot-mix asphalt or a well-built millings driveway is a better match than gray RCA.
You need fast drainage. Use clean stone such as #57 stone for French drains and open drainage layers, not a fines-heavy crushed concrete mix.
The pile is full of trash metal or chunk asphalt. Walk away or ask for a cleaner product; debris shows up in tires and in the finished grade.
A named virgin base is required. If plans call for a certified state aggregate, stick to that product or get written approval for an equal.

Virgin dense blends such as crusher run or dense grade aggregate are the usual alternative when you want similar packing with a more uniform rock and fewer recycled leftovers.

Buying tips

Inspect the pile. Look for rebar stubs, wire, large asphalt chunks and mud balls.
Ask for the gradation. “3/4 inch with fines” and “1 1/2 inch clean” behave very differently.
Confirm virgin vs recycled labeling on the ticket so you know what was delivered.
Plan the drop. Have the truck dump on a firm pad close to the work, clear of septic lids, soft lawn and overhead wires.

Questions people ask

Is crushed concrete good for a driveway?

Yes for many gravel-style driveways and as a compacted base, especially when the mix includes fines and is placed in lifts. Inspect the pile for rebar and debris, and plan on grading and top-ups over time like any gravel driveway.

How much does crushed concrete weigh per yard?

It is often a bit lighter than dense trap-rock blends. Use the supplier's tons-per-yard figure when you can; a middle planning value around 1.2 to 1.5 tons per loose cubic yard is common until you have the ticket weight.

How deep should a crushed concrete driveway be?

Light use on firm soil often lands around 4 to 6 inches compacted. Soft ground or heavier trucks may need 6 to 8 inches or more, built in lifts. Top-ups over a firm existing base may only need 2 to 3 inches.

Is crushed concrete the same as asphalt millings?

No. Crushed concrete is recycled portland cement concrete. Asphalt millings are ground-up asphalt pavement. Both can make driveways, but they look different and behave differently when compacted.

Does crushed concrete drain well?

Dense mixes with fines pack hard and drain more slowly than clean stone. Use clean stone for French drains. Crown or slope a crushed concrete driveway so surface water runs off.

Can I put asphalt over crushed concrete?

Often yes, when the recycled concrete is compacted as a proper base. Ask the paving contractor whether the product meets the base they want, and see our guide on recycled concrete under asphalt.

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