If your driveway, patio, or sidewalk is cracking, heaving, or crumbling, there's almost always a specific, explainable cause — and in Missouri, freeze-thaw cycling and soil movement are behind most of it.
Water expands roughly 9% in volume when it freezes. If that water is sitting inside a crack, a pore, or underneath a slab, the expansion exerts real pressure on the surrounding concrete. Missouri's climate cycles through dozens of freeze-thaw events each winter — not one long freeze, but repeated freezing and thawing — and every cycle repeats the same damage, widening existing cracks and creating new stress points.
Standard concrete without air entrainment has almost no room for trapped water to expand, so freeze-thaw pressure goes directly into cracking the material. Air-entrained concrete mixes in microscopic air bubbles — typically 5–7% of the mix by volume — that give that expanding water somewhere to go. This single specification is one of the most important factors in how long exterior concrete lasts in our climate, and it's something worth confirming is included in any quote you get.
Concrete cracks — that's not avoidable over a large enough slab. What's controllable is where it cracks. Control joints are intentional grooves cut into the surface that create a weak point, so the slab cracks along that line instead of randomly across the surface. Proper spacing is roughly 24–30 times the slab thickness in inches (for a 4-inch slab, that's joints every 8–10 feet). Too few joints, spaced too far apart, is a common shortcut that leads to random surface cracking.
Freeze-thaw isn't the only factor — Cape County's clay-heavy soil expands when wet and contracts when dry, shifting whatever sits on top of it. Combined with freeze-thaw cycling of moisture in the soil itself (frost heave), this is why base preparation matters as much as the concrete mix itself. See our full clay soil and base prep guide for the details.
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