Concrete vs Asphalt Driveway: Which One Suits a Greenville, SC Home?

What is the difference between a concrete and an asphalt driveway?

Both start as crushed stone and sand. In asphalt a petroleum-based binder holds it together, in concrete it's portland cement and water, and pavement engineers file the two under different names: asphalt is a flexible pavement, concrete a rigid one.

Flexible means an asphalt drive gives a little under a heavy load and moves with the ground under it. A concrete slab spreads the load out instead, and when it does give up, it cracks. That is why joints get cut into a concrete driveway on purpose, so the crack lands on a straight line where you want it. If you're curious what the cement part of concrete actually is, we wrote up cement vs concrete separately.

Red clay and the base underneath

Upstate red clay swells when it's wet and shrinks when it dries, and a driveway on a thin base goes along for the ride whichever surface it has. That's the reason for a compacted stone base under any driveway, and enough fall on the surface that rain runs off instead of soaking the clay at the edges.

Winter is the other half of it. Our post on freeze-thaw concrete damage in the Upstate goes into what January and February do to a slab that was built wrong.

What does a concrete mix built for freezing and thawing actually require?

Engineers do not leave freeze-thaw resistance to chance; it is a written specification. The Portland Cement Association's own durability requirement for concrete that will face freezing, thawing and deicing salts calls for air-entrained concrete with 5 to 8 percent total air content and a maximum water-cement ratio of 0.45. Those tiny, deliberately mixed-in air bubbles give the water already inside the concrete somewhere to go when it freezes and expands, instead of pushing outward against the surrounding paste and cracking it from the inside.

Timing matters too. NRMCA's CIP 27 says concrete that will sit saturated with water and face cycles of freezing and thawing needs to reach a compressive strength of at least 3500 psi before that first freeze-thaw season arrives, well above the roughly 500 psi threshold where fresh concrete is simply safe from freezing at all. That two-tier standard, protected from freezing within about two days, but not truly freeze-thaw ready until it has gained most of its strength, is the reason the timing of a pour matters as much as the mix design itself for anything poured close to winter in the Upstate.

The ready-mix side of the spec matters too. ASTM C94, the standard both NRMCA and PCA point to for ready mixed concrete, is the reference a producer works from to keep aggregate source, cement type and slump inside the range a durable driveway mix calls for once the pour starts, since adding water at the jobsite to loosen a mix that has started to stiffen is one of the more common ways a freeze-thaw-rated mix ends up short of its own spec.

Why does a driveway need isolation joints as well as control joints?

Control joints are only half of what NRMCA's CIP 6 covers. The other kind, isolation joints, exist to "separate or isolate slabs from other parts of the structure, such as walls, footings, or columns; and driveways and patios from sidewalks, garage slabs, stairs, lightpoles and other points of restraint," in the guide's own words. A driveway that ties directly into a garage slab or a front walk without one of these joints has no room to move independently of the concrete next to it, and CIP 6 says that restraint is exactly what drives cracking at those junctions.

Isolation joints get filled differently than control joints do. CIP 6 calls for premolded joint filler, materials like asphalt-impregnated fiber sheeting or compressible foam strips, rather than a plain saw cut, so the two slabs can expand and contract without transferring stress across the joint. On a typical Greenville driveway that means a strip at the garage apron and another where the drive meets a front walk or a stoop, the two places a slab most often shares an edge with something that was poured separately and will move at its own rate through the year.

Cooling too fast in the first day matters here too. NRMCA's CIP 11 says a slab should not be allowed to cool faster than 5°F per hour during its first 24 hours, whether the drop comes from a cold front moving through behind a fall pour or from pulling insulation off too soon; a faster swing than that risks thermal cracking before the concrete has gained enough strength to handle it. That cooling-rate limit sits alongside the joint spacing and isolation rules as one more reason a driveway poured and cured under the right conditions outlasts one that was rushed.

Which one needs more upkeep?

Asphalt, in general. Owners usually sealcoat it every so often to protect the binder from sun and water, and a paving company can tell you how often they'd do yours.

A concrete drive mostly wants water running off it and any crack looked at while it's still small. When one does fail, it's a choice between resurfacing and tearing out, and our guide to driveway repour vs resurfacing covers how to tell which one you're looking at.

Questions Upstate homeowners ask

If concrete is the way you're leaning, our concrete driveway page shows how we build them, and you can ask there for a free estimate.