Concrete Driveway Repair Terms Explained: A Plain-English Glossary
If you're getting quotes to fix a sunken or cracked driveway in Des Moines, the jargon piles up fast. This concrete driveway repair glossary breaks down the terms you'll see in estimates, hear on the phone, and read in reviews. Use it to understand what each fix actually does, ask sharper questions, and spot when a quote doesn't match your problem. No sales pitch, just plain definitions from people who level concrete for a living.
- Concrete Leveling: raising sunken slabs back into place
- Concrete Lifting: another name for the same fix
- Slab Jacking: the umbrella term for lifting from below
- Mudjacking: lifting slabs with a cement slurry
- Polyurethane Foam Injection: lifting slabs with expanding foam
- Self-Leveling Concrete: a pourable overlay that finds its own level
- Settling: soil sinking and taking your concrete with it
- Sunken Slab: a section of concrete that has dropped
- Void: an empty gap under the slab
- Expansive Clay Soil: soil that swells and shrinks with moisture
- Freeze-Thaw Cycle: winter's slow attack on concrete
- Spalling: flaking or pitting on the surface
- Crack Filling: sealing cracks to keep water out
- Crack Repair: fixing cracks so they don't spread
- Resurfacing: a new top layer over worn concrete
- Tripping Hazard: an uneven edge that catches your foot
- Control Joint: a planned line where concrete is allowed to crack
- Cure Time: how long before you can use the slab again
Concrete Repair Terms: Leveling, Lifting, and Jacking in Your Driveway Glossary
Most of the confusion in a concrete driveway repair glossary starts here, because three or four different words often describe the same basic job. Here's how they sort out.
Concrete Leveling
Concrete leveling is the process of raising a sunken concrete slab back to its original height instead of tearing it out and pouring new. A crew drills small holes in the slab, pumps material underneath, and the slab rises. It costs less than replacement and you can often use the driveway the same day or the next. If your slab is sunken but still in one solid piece, leveling is usually the fix a specialist will suggest first.
Concrete Lifting
Concrete lifting means the same thing as concrete leveling: pushing a settled slab back up from below. Some companies say lifting, some say leveling, and a few use both in the same quote. Don't let the word swap confuse you; the job is identical. What matters is which material they plan to pump under your slab, which the next few terms explain.
Slab Jacking
Slab jacking is the umbrella term for any method that lifts a sunken slab by pumping material into the space beneath it. Mudjacking and polyurethane foam injection are both types of slab jacking. If a quote says "slab jacking" without naming the material, ask which one they mean. The material affects weight on the soil, hole size, and cure time.
Mudjacking
Mudjacking is a slab-lifting method that pumps a slurry of cement, soil, and water through holes drilled in the concrete to raise it. It's the older, proven approach, and the slurry itself is heavy, which works fine on stable soil. The drilled holes are larger than foam holes, about the size of a soda can, and get patched after the lift. Mudjacking often makes sense for heavier slabs or bigger voids where a dense fill helps.
Polyurethane Foam Injection
Polyurethane foam injection is a slab-lifting method that pumps expanding foam through small holes to raise sunken concrete. The foam expands under the slab, fills voids, and hardens within minutes, so you can usually drive on the slab the same day. The holes are about the size of a penny, smaller than mudjacking holes. Foam weighs far less than slurry, which matters on soft or wet soil that has already settled once.
Self-Leveling Concrete
Self-leveling concrete is a pourable cement mix that spreads out and flattens itself to fix dips and low spots on the surface of a slab. It fixes an uneven surface, not a sunken slab; it can't raise concrete that has dropped an inch at the joint. It shows up more often on garage floors and interior slabs than on driveways. If a provider suggests it for your driveway, ask whether the slab has actually settled or just has surface dips.
Driveway Damage: Soil and Weather Terms in Your Repair Glossary
Around Des Moines, the ground itself is usually the culprit. These terms explain what's happening under your driveway.
Settling
Settling means the soil under your concrete has compressed or washed away, letting the slab sink. It's the root cause behind most concrete driveway repair calls, not a defect in the concrete itself. Poorly compacted fill dirt, downspouts dumping water at the slab edge, and dry summers that shrink clay all cause it. A good estimator should tell you why your slab settled, not just quote a lift.
Sunken Slab
A sunken slab is a section of concrete that has dropped below its original position, usually leaving a step or gap at a joint. You'll notice it as a lip between driveway sections, a gap under the garage door, or water pooling where it never used to. A sunken slab that's still structurally sound is the ideal candidate for lifting. One that's shattered into many pieces may need replacement instead, and an honest provider will say so.
Void
A void is an empty space under a concrete slab where soil used to be. Water washing under the slab, or clay shrinking during a drought, leaves these hollow pockets. A slab over a void may sound hollow when tapped and will eventually crack or sink into the gap. Both mudjacking and foam injection fill voids as part of the lift, which is half the value of the job.
Expansive Clay Soil
Expansive clay soil is soil that swells when wet and shrinks when dry, moving anything built on top of it. Central Iowa sits on plenty of it, which is why settling driveways are so common in the Des Moines metro. A wet spring swells the clay; a dry August shrinks it and opens gaps under your slab. This cycle is why the soil under a driveway can fail even when the original pour was done right.
Freeze-Thaw Cycle
The freeze-thaw cycle is the repeated freezing and thawing of water inside and beneath concrete, which slowly cracks and heaves it. Water seeps into cracks, freezes, expands, and pries the crack wider each winter. Iowa winters put driveways through dozens of these cycles a year. This is why crack filling before winter matters: dry cracks can't do freeze damage.
Spalling
Spalling is surface flaking, pitting, or chipping on concrete, usually caused by freeze-thaw damage or deicing salt. It's cosmetic at first but exposes the rougher interior of the slab, which then wears faster. Spalling is a surface problem, so lifting won't fix it; resurfacing will. If a quote mentions spalling, expect the conversation to turn to resurfacing rather than leveling.
Cracks, Surfaces, and Safety Terms
Crack Filling
Crack filling is sealing a concrete crack with a flexible material to keep water and debris out. It doesn't make the crack invisible; it stops water from getting underneath the slab and freezing inside the crack. Think of it as maintenance that protects a leveling job or delays the next one. It's a small line item that prevents bigger ones.
Crack Repair
Crack repair means fixing a crack in a way that restores strength or stops it from spreading, going beyond a simple surface seal. Depending on the crack, that can mean routing it out and filling it with a structural material. The difference from crack filling is depth and purpose: filling seals, repair reinforces. Ask which one a quote includes, since the words get used loosely.
Resurfacing
Resurfacing is applying a thin new layer of concrete or overlay material across the top of a worn slab. It fixes spalling, pitting, and stains, and gives an old driveway a fresh face. It does not fix settling; a sunken slab needs lifting first, then resurfacing if the surface is rough. Done in the right order, the two fixes work together.
Tripping Hazard
A tripping hazard is an uneven edge in concrete, usually where one slab section sits higher than its neighbor, that can catch a foot. Even a half-inch lip is enough to trip someone, and city sidewalk programs often flag these edges. On a driveway, the same lip scrapes snow shovels and car tires. Leveling the low slab removes the hazard without replacing anything.
Control Joint
A control joint is a straight groove cut or formed into concrete to control where it cracks. Concrete shrinks as it cures and will crack somewhere; the joint gives it a neat, planned place to do it. Cracks inside control joints are normal. Cracks wandering across the middle of a slab panel are the ones worth showing an estimator.
Cure Time
Cure time is how long repair material needs to harden before the slab can carry weight again. Polyurethane foam cures within minutes to hours, so you can often park on the driveway the same day. Mudjacking slurry needs longer, commonly a day or more, before heavy loads. Cure time is one of the main practical differences between the two methods, so ask about it before scheduling.
Using These Terms
You now have what this concrete driveway repair glossary is built to give you: the words to read a quote line by line and know what each one commits the contractor to. When an estimator says mudjacking, foam, or resurfacing, you'll know what's under the slab, what's on top of it, and what question to ask next. That's the whole point of learning the language before you sign anything.
If you need concrete leveling, Des Moines Concrete Leveling Pros can help.
Prefer to talk it through? Call +15155828701 — a quick call is usually the fastest way to get a straight answer for your situation.