Two concrete finishers hand-troweling a fresh sidewalk pour along the form boards
Straight Answers

What PSI concrete mix should a driveway use in Winston-Salem?

(336) 608-5157Get Free Estimate

A residential concrete driveway in Winston-Salem should be poured at 3,000 to 3,500 PSI, stepped up to 4,000 PSI for slabs carrying heavy vehicles, and in the Piedmont the mix should be air-entrained: microscopic air bubbles, typically 5 to 7 percent of the mix, that give freezing water somewhere to expand without breaking the surface. PSI measures the compressive strength the concrete reaches at its full 28 day cure. It is worth knowing because it appears on the delivery ticket, which makes it one of the few specs you can verify on pour day.

Updated Aug 17, 2026 · Winston-Salem Concrete Co, Winston-Salem, NC

Concrete DrivewaysConcrete SlabsFoundations & Footings

What the PSI number means

PSI is pounds per square inch of compressive strength at 28 days, the standard test age. A 3,500 PSI mix carries more load and shrugs off surface wear better than a 2,500 PSI mix, and costs more because it carries more cement.

More is not automatically better. Residential flatwork gains little above 4,000 PSI, and the money is better spent on the base, reinforcement, or thickness. Where the higher grades belong is commercial work and slabs with real loads.

Common concrete strengths and where each belongs for residential work in the Winston-Salem area.
StrengthWhere it belongs
2,500 PSINon-structural fill, some footings. Too light for a driveway surface.
3,000 PSIWalkways, patios, standard driveways. The residential floor.
3,500 PSIDriveways, the common quoted spec here
4,000 PSIHeavy vehicles, aprons, garage and shop floors
4,500+ PSICommercial and engineered work

Air entrainment: the spec that matters here

Winston-Salem winters cross freezing dozens of nights a year and thaw by lunchtime, and that cycling is what destroys concrete surfaces, not the cold itself. Air-entrained concrete builds billions of microscopic bubbles into the paste, and when absorbed water freezes and expands it pushes into those voids instead of popping the surface off as scaling.

For exterior concrete in this climate air entrainment should be on the mix design, not an upgrade. It is standard practice for exterior flatwork across the Piedmont, and worth confirming on any bid: ask what PSI and what air content the quote is based on. A contractor who can answer in one sentence has ordered a lot of concrete.

Common questions

Can I check what mix was actually delivered?⌄
Yes. Every ready-mix truck arrives with a batch ticket stating the mix design, strength, and time it was batched. Asking to see it is normal, not rude, and keeping a photo of it with your paperwork is a habit we encourage.
Does higher PSI mean the driveway will not crack?⌄
No. Cracking is governed by shrinkage, joints, base and reinforcement far more than by strength grade. A 4,500 PSI slab on a bad base cracks just like a cheaper one, it just costs more while it does.
What is a bag-mix versus ready-mix?⌄
Bagged concrete mixed on site suits fence posts and small repairs. A driveway needs ready-mix delivered by truck: consistent strength through the whole pour, correct air entrainment, and enough volume placed fast enough to finish it as one slab.

People also ask

Want a real number for your exact job? It's free.

Call or Text (336) 608-5157